WO2003075033A1

WO2003075033A1 - Position direction system

Info

Publication number: WO2003075033A1
Application number: PCT/CN2003/000176
Authority: WO
Inventors: Lumin Feng
Original assignee: Lumin Feng
Priority date: 2002-03-07
Filing date: 2003-03-07
Publication date: 2003-09-12
Also published as: CN1147737C; CN1376933A; AU2003211686A1

Abstract

The present invention discloses a position direction system, terra marks and terminals which are in the system. Said position direction system, it comprises: at least one terra mark for transmitting attibute information around a predetermined range ; and terminal for receiving the attibute information transmitted from at least one said terra mark, then outputting the information with predetermined form for users.

Description

Position indication system Technical field

The present invention relates to a position indication system. Specifically, a position indication system using a landmark and a terminal is designed. Background technique

If people need to determine the position of the location, a GPS terminal device is generally used. This device is used to receive the same-frequency signal parameters of 3 to 4 satellites out of 21 special satellites launched by the U.S. military at the same time. After demodulation, the real-time positions of these satellites in space and the unified time when transmitting signals are obtained Its built-in calculation unit obtains the latitude, longitude, and altitude of the Earth's location based on complex processing methods. The characteristic of this system is that accurate coordinate values can be obtained in real time anywhere in the world. However, since the GPS system uses microwave frequencies to send positioning information, microwaves have the characteristic of traveling straight as light. In high-rise cities and undulating hills, satellite applications can be blocked to form blind spots. In addition, the market price of GPS system terminals and major chips are still quite expensive, which has formed a significant obstacle to the popularization of this advanced technology. At the same time, for strategic considerations, the United States has adopted restrictions on GPS positioning accuracy, such as 50 to 100 meters for China. The operation of this system is controlled by the US military, so the application of this system is completely controlled by others.

For a long time, people's exploration of various automatic positioning technologies has not stopped, even when the GPS system has entered the practical stage.

Liaoning University disclosed in a patent application No. 98123001.6 a system that is almost opposite to GPS. A positioning system is built on the ground and consists of a carrier that sends signals and three receiving base stations with clear coordinates. The invention is characterized in that the receiving base station group calculates the distance between the carrier and the three base stations by measuring the difference in the reception time of signals from the same carrier, so as to obtain the position coordinates of the carrier itself. Because the measurement error of time is about 200 nanoseconds, the positioning error of the system is about 60 meters. It should be emphasized that the invention only mentions the single-user use mode, and in the case of a large number of users, in order to receive the positioning of multiple carriers at the same time, please It is required that, in addition to transmitting the carrier's own code to each base station, each carrier also needs to transmit uniform time information so that the three base stations can synchronize processing, and the time information needs to be obtained from another timing system. In addition, the system's information flow distribution is not reasonable enough, and all application calculations need to be completed by the base station. A large number of bearer positioning information requests may cause the computing capacity of the base station system to be overloaded.

In the patent application with the application number of 99118134.4, the United States Longxun company disclosed a positioning system named "pattern recognition based on geodetic positioning". This invention is characterized by: using mobile phones and a base station network serving mobile phones, the coverage of each base station can be divided into 40,000 sub-cells, and pattern recognition technology is used to identify the sub-cell radio frequency carried in the information returned by the mobile phone to the positioning center Attribute and radio frequency attribute of the mobile phone, and then determine the base station and which sub-cell area of the mobile phone through the database data retrieved by the positioning center. Although this system has a low network construction cost (only one or several positioning center stations need to be established to interpret the encoded information sent by each mobile phone), but because the mobile phone configuration is low, there is no computing power required for the application, so As with the previous positioning technology invention, all services need to be provided by the central station, which overloads the positioning center with information. Therefore, it is difficult to develop specific applications in addition to the positioning function.

Shenzhen Yonghua Electronic System Co., Ltd. discloses an improved vehicle anti-theft system (CAS) based on an active beacon station and a wireless receiving station in a patent application with the application number of 99114311.6. It is characterized by transmitting the beacon code by means of active wireless beacon stations arranged in a distributed manner, and the anti-theft vehicle receives the beacon station code when it is in a certain beacon station area. When the anti-theft vehicle is in distress, the vehicle transmits the code together with the vehicle code via the on-board transmitter. The distributed high-level network: After receiving the alarm information, the police station transmits the alarm information to the monitoring center through the wired communication network, and the alarm center accepts the alarm. This system requires both a certain density of the network layout, manual maintenance and the supply of base station operating energy. The high-level network police station also needs a wired communication network connection. The conditions required for system establishment are high, and the positioning accuracy can reach several kilometers. level. Because the positioning accuracy is too low, many applications are difficult to implement on the system. Summary of the Invention

According to an aspect of the present invention, a position indication system is provided, including: at least one A landmark for transmitting attribute information to a predetermined space around the terminal; and a terminal for receiving attribute information transmitted by the at least one landmark and outputting the information to a user in a predetermined form.

Preferably, the position indication system includes a plurality of the landmarks distributed at different positions, and the terminal receives attribute information transmitted by one of the landmarks; the attribute information includes a coding identifier, landmark coordinates, and A variety of information forms such as property files; property files include one or a combination of postal code, text, voice, video, and image information.

Preferably, the energy required for the landmark is provided by the terminal.

Preferably, each of the plurality of landmarks includes: a memory for storing the attribute information data; a first modem for modulating and demodulating the attribute information data; and a first antenna for passing the attribute information data. The information data modulated by the first modem is transmitted in the form of a radio signal to the predetermined space in the surroundings; or the radio signal of the terminal is received in the predetermined space, and the information data is demodulated by the first modem. In addition, the terminal includes: a second antenna for receiving a radio signal transmitted by the landmark; a second modem for modulating and demodulating a signal received by the second antenna; an application information processor for: Processing the information data about the second modem modulation or demodulation, and passing the processed data to the information output device or the second antenna, and decoding the attribute file from the second modem and transmitting the message output device; and information output Means for outputting the attribute information to a user in a predetermined form.

Preferably, the first antenna of the landmark is further used for receiving energy radiation; the landmark further includes an energy conversion and control circuit for converting energy from the first antenna into electrical energy; a second antenna of the terminal, It is also used to radiate energy to the surroundings.

Preferably, the terminal further includes a transmission power control device for real-time monitoring of a field strength at a space transmission frequency to control the transmission power of the second antenna.

Preferably, the information output device outputs the attribute information to a user in a manner of voice, video, image, or light.

According to another aspect of the present invention, a landmark is provided for transmitting information for positioning to a predetermined spatial range around it, including: a memory for storing the attribute information number. A first modem for modulating the attribute information data and demodulating a signal from a first antenna; and a first antenna for transmitting the information data modulated by the first modem in the form of a radio signal To within the predetermined space range around, and receive radio signals from the terminal within the predetermined space range.

According to still another aspect of the present invention, a terminal is provided for receiving attribute information transmitted by the at least one landmark and outputting the information to a user in a predetermined form, including: an antenna, configured to: Transmitting a terminal's radio query signal to the landmark and receiving the radio signal transmitted by the landmark; a modem for demodulating the signal received by the antenna and modulating the query information from the application information processor to the landmark; and application information processing A processor for processing the information data demodulated by the second modem and transmitting the processed data to the information output device; and an information output device for outputting the attribute information to the user in a predetermined form. BRIEF DESCRIPTION OF THE DRAWINGS

Figure 1 shows the working principle of the system

Figure 2 is a block diagram of landmark components and information flow

Figure 3 is a block diagram of the vehicle terminal components and information flow

Figure 4 is a diagram of the landmark system on the road

Figure 5 is a block diagram of terminal components and information flow for pedestrian applications

Fig. 6 is the relationship between the launch (excitation) range and the receiving range between the landmark and the terminal. Fig. 7 is the schematic diagram of the landmark reading result without the anti-collision mechanism.

Figure 8 shows the results of landmark reading under the anti-collision mechanism.

Figure 9 is a schematic diagram of the landmark combination method

Figure 10 is a schematic diagram of the directional excitation method

1. Landmark, 11. Landmark antenna, 110. Landmark attribute information, 111. Landmark transmission range, 112. Landmark reception range, 113. Landmark reading range, 12. Landmark modem, 13. Landmark energy conversion and control circuit, 14. Landmark memory, 15. Landmark information controller, 2. Terminal, 21. Terminal antenna, 210. Terminal instruction, 211. Terminal antenna transmitting (excitation) range, 212. Terminal antenna receiving range, 22. Terminal modem, 23. terminal should With information processor, 24. Landmark application information system, 25. Information output device, 251. Electronic map, 252. Voice output device, 253. Signal output device, 26. Wireless digital machine, 27. Transmission power control device, 271. Transmitter field strength sensor, 272. Antenna transmission controller, 3. Monitoring center, 30. Alarm information, 31. Robbery alarm information, 32. Distress alarm information, 33 · Help alarm information, 34. Anti-control information, 4. Carrier . detailed description

The present invention is described in further detail below with reference to the drawings and embodiments. As shown in FIG. 1, the present invention includes three parts: a landmark 1, a terminal 2 and a monitoring center 3. The landmark 1 is arranged on all ground or near-ground locations that need to be clear of their coordinate positions or have a prompt meaning, and the terminal 2 is disposed on On carrier 4, where

1. Landmark 1 consists of the following parts (see Figure 2):

(1) Antenna 11:

It is used to receive work instructions and energy radiation from the terminal 2 and transmit the attribute information 110 of the landmark 1 on the transmitting carrier frequency. The antenna 11 can also be set separately according to the receiving antenna and the transmitting antenna.

(2) Modem I ² :

The received instruction from the terminal 2 is demodulated and the transmitted attribute information is modulated on its transmitting carrier.

(3) Energy conversion and control circuit 13:

The energy from the antenna 11 is converted into the energy for the internal circuit of the landmark 1 to work. As a result, the persistence of the working status of the landmark is determined without manual maintenance. The energy control circuit has the energy and voltage signal preparation necessary for the landmark information controller to establish various operating states.

(4) Memory 14:

Includes memory in the form of RAM, ROM, and EEPROM. Among them, RAM is used as an intermediate operation register for internal logic processing, and ROM is used to place fixed landmark codes or coordinates.

EEPROM is used to record event information or to store landmark property files. The built-in attribute information 110 of the landmark 1 may be a landmark code, an attribute file, or coordinates of the landmark. Included in the code Area code and serial number of landmarks in this area. The built-in coordinates of the landmark 1 include various forms of coordinates describing the location where the landmark is located, as well as other representation methods with the meaning of locating the location of the landmark represented by words, numbers, and letters. The properties file may include a zip code, text, audio, video, and image data file to indicate instructions to the user. The event information recorded by the EEPROM may include the system serial number of the hijacked alarm carrier 4 issued by the alarm terminal and the elapsed time.

EEPROM can cyclically record multiple complete terminal alarm passing events, so that subsequent vehicles can read the alarm information.

(5) Landmark information controller 15:

The function of driving each part of the landmark is to work together. When receiving the alarm information from the terminal, if it is a robbery alarm, the landmark information controller 15 writes the alarm information into the EEPROM. Other warning messages will not be reversed.

2. Terminal 2 is mainly composed of the following parts (see Figure 3):

(1) Antenna 21:

On the receiving band of the landmark 1, the carrier signal from the modem 22 will continuously radiate energy to the air, and the landmark 1 will be stimulated to respond to its attribute information 110. The carrier signal from the landmark 1 is received and sent to the modem 22.

(2) Modem 22:

The carrier signal from the antenna 21 is demodulated, and the information is sent to the application information processor 23. The data from the application information processor 23 is modulated into a carrier signal, and the signal is sent to the antenna 21 for transmission.

(3) Application Information Processor 23:

Using microprocessor and embedded operating system architecture, it works under the drive of embedded operating system. The processing method of the attribute information 110 is determined according to the landmark attribute information 110 read by the modem. When the landmark attribute information 110 is a landmark code, the code is used as a search word, and the attribute information 110 related to the code is retrieved from the application information system 24, and then applied to the information output unit according to the properties of the attribute information 110 Information format display; when the attribute information 110 includes data such as zip code, text, audio, video, or image, the application information processor 23 sends it to the corresponding part of the message output device 25, so as to output in an appropriate manner Give Households.

(4) Landmark Application Information System 24:

Exist in the form of application software. It is used to explain the meaning of the landmark code when it is used to read a large amount of information in a landmark at high speed, because of technical limitations, it cannot meet the requirements of all the correct reading in a short time. The interior contains a certain area or the whole All landmark codes of the positioning system and their corresponding coding attributes. You can upgrade the landmark ^ code information and coding attribute content by replacing the t memory card or other methods. It uses the landmark code as the search word, and uses the earth's longitude and altitude of the landmark, and related multimedia files for retrieval purposes.

(5) Information output device 25:

The information output device 25 includes:

The electronic map 251 provides visual assistance to the user of the terminal, receives coordinate information from the application information processor 23, and is driven by the application information processor 23 to display map information, and displays the position of the carrier 4 thereon. It also has the function of setting, canceling and changing driving directions. Alternatively, it may be applied to a display device that displays text, video, or image information.

The voice output device 252 has a computer multimedia file playing function, and provides prompts in the form of voice to the user of the terminal;

The signal output device 253 may be selected as a beep sound when a landmark is read. The signal can also express different meanings in different pulse forms, so as to provide prompt help to the user of the terminal in a simple form.

(6) Wireless digital transceiver 26:

Report the condition of the carrier 4 to the monitoring center 3 or other nearby terminals. The transmitting device sends information in a dedicated wireless manner, such as GSM, CDMA, or co-frequency broadcasting. In addition, it can also receive digital, letter and Chinese character data information from the monitoring center 3 or the traffic control center, and can also be used as counter-control information to forcibly open the information data transmitting device to report the coordinates of the terminal 2 to the monitoring center 3. . At the same time, the traffic guidance information from the traffic information station can be functionally linked with the electronic map 251, and the result can be displayed on the information output device of the terminal 2 in the form of a reference driving route and the like.

(7) Transmit power controller 27: The transmission power controller 27 includes a transmission field strength sensor 271 and an antenna transmission controller 272. In order to avoid the excessively high emission field strength from adversely affecting personnel and equipment, the emission field strength near the carrier must be controlled. The transmitting field strength sensor constantly monitors the field strength at the space transmitting frequency in real time regardless of whether the terminal's transmitting antenna is working or not. If the measured field strength is higher than the first field strength, the antenna transmission controller 272 reduces the transmitting power level of the terminal, or even turns off the working state of the terminal ’s transmitting antenna until the field strength value reaches the first field. Strong threshold.

3.Monitoring center 3:

Maintain the operation of each terminal in the system, release information, and provide services to terminal users in the alarm state.

The working steps of this system are as follows:

1. When the carrier 4 equipped with the terminal 2 is close to the landmark 1, if the landmark 1 is within the transmitting range 211 of the antenna 21 of the terminal 2, the landmark 1 will be activated and its landmark attribute information 110 will be transmitted.

2. When the vehicle-mounted terminal moves at a low speed, the terminal transmitting and receiving levels are normal values. When the loading vehicle accelerates to the first speed threshold, the transmitting and receiving levels of the terminal's antenna will show a fixed regularity as the moving speed increases. Increase until the speed value of the vehicle reaches the second speed alarm value. The transmit and receive levels increase with the speed, so that the landmarks are more strongly stimulated to store enough energy, reduce the time required for initialization to complete, and transmit the landmark information earlier than normal to adapt to the high-speed movement of the terminal. Landmark read and write requirements (see Figure 4).

3. The legality confirmation operation will be performed between Landmark 1 and Terminal 2. The identity information of the terminal 2 is carried by the instruction information sent by it, and the identity information of the landmark is carried by the encoded information sent by it. In the operation of multiple landmarks 2 on a landmark, the landmark does not identify the identity of the landmark 2 but only encodes the landmarks according to the encryption rules predetermined by the system, or the codes sent according to the rolling encryption rules.

4. The modem 22 of the terminal 2 reads the attribute information 110 in the landmark 1 and sends it to the application information processor 23.

5. After receiving the attribute information 110, the application information processor 23 may choose to cause the signal output device 253 to buzz, and encode the landmark information in the attribute information 110 in the application information. The information system 24 retrieves the geographic location coordinates related to the code and other application attribute content under the coordinates.

6. The application information processor 23 transmits the coordinate application attribute content to the information output device 25. The electronic map 251 can optionally display the position of the landmark on the electronic map 251 to indicate the instant position of the carrier 4. The voice output device 252 can select the instant The audio portion of the content of the attribute information 110 is broadcast, and the carrier 4 is prompted or informed about the navigation and guide information.

7. The field strength sensor 271 in the terminal's transmitting power controller 27 continuously monitors the value of the transmitting field strength at the location where the terminal is located. If the monitored value is higher than the first field strength threshold, the antenna transmission controller 272 reduces the transmission level of the terminal 2 or even turns off the working state of the transmitting antenna of the terminal 2 until the field strength value reaches the first field strength threshold.

Application examples of this system:

1. Secondary parameter calculation:

When three adjacent landmarks are continuously passed on the road, the terminal 2 can calculate the average driving speed, the average driving acceleration, and the driving direction of the vehicle according to the adjacent distances and intervals of the landmarks and the passing sequence. This is the calculation capacity of the secondary parameters of the local standard system. The distance between adjacent landmarks can be retrieved in the landmark application information system and calculated.

2. Alarm application:

When the carrier 4 encounters an emergency, the alarm information is manually transmitted through the wireless digital terminal 26 of the terminal 2 to the control center 3 or other nearby terminals to receive it through the wireless digital terminal. The information data contained in the alarm information includes the latest existing landmark information in the landmark system application information processor 23, the serial number of the alarm carrier 4 system, the speed of movement, the direction of movement, the time and the manually selected information categories, such as distress, robbery, help Wait.

When the terminal is in the alarm state, if the terminal passes the landmark, the terminal will write the alarm information to the landmark via the transmitting antenna. The warning information written in the landmark includes the serial number of the hijacked carrier 4 system and the elapsed time.

When the monitoring center 3 thinks that a carrier 4 carrying the terminal 2 may be robbed or disappeared, the monitoring center 3 may issue counter-control information to force the terminal 2 to be assigned an alarm status until a command to force the carrier 4 to stop. When the information data transmitting device of the terminal 2 is in an alarm state, the wireless digital transceiver 26 receives new landmark information through the antenna of the terminal 2 or when no new landmark information is received at a certain interval. The alarm information is broadcast on the transmission band, so that the monitoring center 3 and other neighboring terminals 2 receive the alarm information.

When the terminal 2 receives the alarm information of other terminals via the wireless digital transceiver, the landmark information processor 23 compares the landmark coordinate value in the alarm information with the latest landmark value of the terminal 2 itself. If it is judged that it is a non-adjacent terminal's alarm message, this terminal 2 will not respond. If it is judged that it is an alarm message issued by the nearby terminal 2, it will report to the monitoring center 3 and alert the terminal 2.

When the terminal finds that the landmark information read when it passes the landmark contains the robbery alarm information 31, it will automatically compare the time of the terminal with the time contained in the alarm information. If the time difference is within the first time threshold, the alarm information in the landmark will be alerted on the terminal 2. If it is within the second time threshold, the terminal will not give an alarm, but will only report to the monitoring center through the wireless digital transceiver. When the time difference is outside the second time threshold, the terminal will ignore it. If the terminal of this system is not equipped with a wireless digital transceiver, or the antenna of the wireless digital transceiver of the hijacked terminal is damaged, the warning information can still be transmitted to the vehicles passing by through the landmark.

The warning on the terminal is expressed in the form of voice, emergency signal and text on the voice output device 252, the signal output device 253 and the electronic map 251. The warning information includes the dynamic landmark information, movement speed, direction of movement of the carrier 4 and the information of the carrier 4 (such as vehicle brand, model, body color or pedestrian's gender, age, height, etc.) in order to help the alert nearby Or, by means of other communication means (such as a mobile phone), under the guidance of the monitoring center 3, track the robbed carrier 4.

3. Navigation application:

When the user sets a planned travel route on the electronic map 251 in advance, the wireless digital transceiver 26 can receive digital information from the monitoring center 3 at any time to interfere with the output result of the information output device. For example, the terminal 2 may receive traffic guidance information from a traffic information station, and automatically give an optimized driving route on the electronic map 251 for selection reference. When the carrier 4 passes a crossing set on a planned travel route, the terminal 2 automatically It prompts the user for direction selection in advance and in real time. It is also possible to provide a unique application for installing landmarks on different lanes to sense the driving lane of the carrier 4 and prompt the terminal user to change lanes in advance in preparation for turning, so that the driving of the vehicle is intelligent.

4. Pedestrian application:

When the carrier 4 as a tourist, travelling blind or ordinary urban resident carries a terminal 2 (see Fig. 5), when a landmark is received at the landmark placement place or a landmark is received at the corner of the blind road, the landmark will emit the landmark code information For the terminal 2 to query its internal attribute encoding information, it may also choose to directly stimulate transmission and receive the attribute information 110 built into its landmark memory 14. Since this application for pedestrians does not require high-speed reading, the amount of information read can be increased to several megabytes, and there can be a more stringent identity authentication process. The information for the landmark disease at this time may be directly built into the landmark, and may be a computer multimedia file, such as a file in MP3 format.

System positioning accuracy:

The coordinate value of each landmark in this positioning system has obtained the centimeter-level accuracy according to the differential positioning technology of the GPS system in advance. The specific coordinates of the carrier 4 entering the landmark range are related to the landmark and the transmitting and receiving capabilities of the terminal.

The antennas of the landmark 1 and terminal 2 used by the ideal positioning system are isotropic antennas, that is, the landmarks that meet the requirements of this system and the minimum electromagnetic field field strength and other intensity surfaces transmitted and received by the terminal are in space. The representations are all spherical. Under the signal of the standard emission level emitted by the landmark 1 and the terminal 2 on the edge of the isosphere, the electromagnetic field strength should reach a level that enables the terminal 2 and the landmark 1 to work normally.

The system may specify that the receiving radius of terminal 2 should be less than or equal to the launch radius of the landmark, and the excitation radius of terminal 2 should not be less than the launch radius of the landmark. This consideration is to enable the high-speed carrier 4, such as a vehicle, to stimulate the landmark when it approaches the landmark, so that the landmark can have a sufficient time to activate, complete the initialization and start transmitting the landmark attribute information 110, and then the vehicle enters the launch area of the landmark ( (See Figure 6).

In FIG. 6, it is assumed that the antenna 21 of the terminal 2 is installed at the upper edge of the roof glass windshield. The landmark in the figure has entered the excitation range of the terminal 2 and the antenna 21 of the terminal 2 has just touched the standard transmission range 111 of the landmark. At this time, the terminal 2 still cannot obtain the attribute information 110 of the landmark. Because At this time, the landmark transmission field strength received by the antenna of the terminal 2 still has not reached the level for its normal reception, and the system stipulates that the terminal 2 should be able to receive the landmark attribute information 110 at this time.

The system stipulates that the launch capability 111 of all landmarks should be the same. On this basis, the terminal receiving range 212 under the same landmark is different due to the terminal difference. The reading range 113 of the landmark is equal to the receiving range 212 of the terminal. The reading range 113 of the same landmark may be different for different terminals. When the terminal's antenna 21: ^ The reading range of the landmark 113, the landmark also enters the receiving range 212 of the terminal at the same time. At this time, the terminal immediately receives the terminal 2 whose attribute information of the landmark is lower than the receiving level specified by the system. Instead, it can obtain higher system coordinate accuracy in the landmark system, and the cost of the receiving device of the terminal 2 can Lower.

Because the local landmarks are too close to each other, the terminal 2 reads the landmarks and there will be a conflict of reading multiple landmarks by one machine. It is most typical when the terminal 2 is just equidistant from two landmarks. In this case, the landmark code obtained by terminal 2 may have the following results:

1. Due to the discreteness of the quality of the landmark, the attribute information 110 of the landmark with a strong launching capability or a short continuous transmission period is easily obtained by the terminal 2 first, and the code transmitted by the other landmark is masked. Although this situation is unforeseeable, the result is stable, and the coordinate accuracy cannot exceed the system expectation;

2. When the terminal 2 has no anti-collision capability, the coded transmission signals of the two landmarks interfere with each other, so that the terminal 2 cannot normally read the two landmark codes. As a result, the terminal 2 still retains the original landmark (away landmark) coding unchanged (see Figure 7). This result is still satisfactory;

3. When terminal 2 has perfect anti-collision capability, the two landmark codes are read normally. The landmark information processor of the terminal 2 can obtain the point coordinates of the two landmarks according to an average algorithm on the coordinates of the two landmarks. In other words, when the terminal 2 finds that it needs to read two landmarks at the same time and starts the anti-collision mechanism, it will automatically prompt the landmark information processor to process the landmark coding according to the average algorithm.

(See Figure 8).

A higher coordinate accuracy can be obtained for a smaller ground reading distance 113. For high positioning accuracy, for example, finding the exact location of a certain landmark can be achieved by using multiple landmark combinations with different transmitting capabilities, or by using the terminal 2's directional excitation and changing the excitation power. In the former case, after the reading range 113 of the landmark with the largest injection capability can continue to search for other landmarks at the same placement position. If all the landmarks are read, the position marked by the last read landmark is the most accurate landmark installation position. This is the landmark combination method. With this method, the terminal 2 must have an anti-collision identification mechanism (see Figure 9). In the latter case, after the terminal 2 enters the reading range 113 of the landmark with the maximum incentive level, the relative orientation of the landmark is determined through directional excitation, and then the incentive level of the first terminal 2 is reduced to the determined incentive direction. March. When the terminal 2 reads the landmark again, keep this direction, reduce the excitation level of the terminal 2 again and continue to travel, until the landmark is read at the minimum first-level incentive level (see Figure 10), that is, Directional shock. The position error of the landmark at this time can be determined within a small range (such as 5 cm). This positioning method is particularly suitable for blind guide blindness and searching and positioning in dark and flat environments.

For mobile vehicle applications, the system expects an accuracy of no more than ± 30 meters, for guides applications, the accuracy is no more than 10 meters, and for blind guide guidance applications, the accuracy can reach 5 cm. The salient features of this positioning system are: the higher the positioning accuracy (up to 1 to 2 mm), the less difficult it is to implement the technology, and the lower the unit price of the equipment. However, as the network density increases, the number of landmarks will increase dramatically. Costs will also increase. Under normal circumstances, landmarks can be targeted at discrete points that need to be positioned to reduce the excessive number of landmarks required for network construction.

Landmark encoded attribute content:

The landmark-encoded attribute content is stored in the application information system 24 in the form of application software. The attributes include the geographic coordinates (or longitude) and altitude of the place where the landmark is installed, the distance and height relative to a landmark, guidance information (such as on a landmark at a road junction), and tourist guide information. The attribute file format of the attribute information 110 may be an MP3 electronic file format to facilitate retrieval and playback.

System construction and maintenance:

The construction of this system is simple. Just use the GPS system to determine the exact coordinates of the point to be installed, and arrange the search word and content of the landmark in the landmark application information system in advance, and then use an impact drill to drill holes at this location (the aperture can be as small as a few centimeters) , Put the passive placemark and close it for restoration. The maintenance of this system is mainly the maintenance of the landmark group, including the verification of the working status of the landmark, the inspection of the operating frequency, the position calibration and the addition of new landmark points. Generally can use the vehicle to carry the field strength meter,

The GPS terminal, the landmark distribution map, and the passive landmark terminal drive along the landmark distribution route to complete the verification of the status of the landmark group.

When the landmark antenna is excited by external energy, the landmark can be used as the working energy, and its built-in attribute information is sent via the antenna. When a pedestrian or vehicle as a carrier carries a terminal near a certain landmark, the terminal excites the landmark and can receive attribute information of the landmark. If the attribute information is in the form of a landmark code, the landmark information processor built in the terminal retrieves the attribute information in the form of the landmark code in its information system, or directly uses the zip code, text, The prompt information in the form of audio, video, or image is directly output to the user, so that the carrier obtains the coordinates, navigation, and guide information of the location. When the carrier alarms, the terminal transmits the information such as the system serial number, coordinates, movement speed, movement direction, and alarm type of the carrier to the terminal through a dedicated wireless method. The terminal excites the landmark and can receive attribute information of the landmark.

The present invention can also use a passive landmark system. Under the premise of a certain landmark launching capability, the coordinate accuracy it can provide depends on the terminal's transmitting and receiving capabilities. In addition, during the work of the landmark, multiple carriers are allowed to acquire the landmark attribute information at the same time. Because the landmarks made with passive technology do not need to be equipped with a power system, the landmarks can be made very small and can be enclosed in glass tubes or plastic containers for hidden placement. At the same time, because the large-scale integrated circuit technology is used, the cost of making landmarks is low, so the cost of establishing and maintaining the system can be very low, and the network can be expanded flexibly.

The present invention can widely replace the GPS system at a low price in the civilian applications of most existing GPS systems. Its prominent feature is that it has the application calculation on the terminal like the GPS system. The system information flow is reasonable, it can provide high positioning accuracy, and the signal will not be blocked. It can be directly applied to the electronic map after digitizing the mapping map. By surveying and mapping the area of the map, an electronic map can be applied under this system, and there will be no misreporting or late reporting of navigation points due to problems with the electronic map. And in vehicle navigation applications, landmarks can be installed on different lanes to prompt advance lane changes to make the driving of the vehicle intelligent.

Claims

Rights request

1. A position indication system comprising:

At least one landmark is used to transmit attribute information to a predetermined space around it; and a terminal is configured to receive attribute information transmitted by the at least one landmark and output the information to a user in a predetermined form.

2. The position indicating system according to claim 1, wherein:

The position indication system includes a plurality of the landmarks distributed at different positions, and the terminal receives attribute information transmitted by one of the landmarks;

The attribute information includes one or a combination of coded identification, text, voice, video, and image information.

3. The position indicating system according to claim 2, wherein the energy required for the landmark is provided by the terminal.

4. The position indicating system according to claim 2, wherein each of the plurality of landmarks comprises:

A memory, configured to store the attribute information data;

A first modem for modulating the attribute information data; and

The first antenna is configured to transmit the information data modulated by the first modem in a form of a radio signal to the predetermined spatial range around it. ,

The terminal includes:

A second antenna for receiving a radio signal transmitted by the landmark;

A second modem for demodulating a signal received by the second antenna; an application information processor for processing information data demodulated by the second modem, and passing the processed data to a message output device; and

An information output device is configured to output the attribute information to a user in a predetermined form.

5. The position indicating system according to claim 4, wherein:

The first antenna of the landmark is further used for receiving energy radiation; the landmark further includes an energy conversion and control circuit for converting energy from the first antenna into electrical energy; and the second antenna of the terminal is further used for Radiates energy to the surroundings.

6. The position indication system according to claim 5, wherein the terminal further comprises a transmission power control device for real-time monitoring of field strength at a space transmission frequency, and controlling transmission power of the second antenna.

7. The position indicating system according to claim 4, wherein the information output device outputs the attribute information to a user in a manner of voice, video, image, or light.

8. A landmark for transmitting information for positioning to a predetermined spatial range, including:

A memory, configured to store the attribute information data;

A first modem for controlling the attribute information data; and

The first antenna is configured to transmit the information data modulated by the first modem in a form of a radio signal to the predetermined spatial range around it.

9. A terminal for receiving attribute information transmitted by the at least one landmark and outputting the information to a user in a predetermined form, comprising:

An antenna for receiving a radio signal transmitted by the landmark;

A modem for demodulating a signal received by the antenna; and

Applying an information processor for processing the information data demodulated by the second modem, and transmitting the processed data to a message output device; and