CN102854500A - Unidirectional wireless ranging method and unidirectional wireless ranging device for vehicles - Google Patents

Unidirectional wireless ranging method and unidirectional wireless ranging device for vehicles Download PDF

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CN102854500A
CN102854500A CN2012102964731A CN201210296473A CN102854500A CN 102854500 A CN102854500 A CN 102854500A CN 2012102964731 A CN2012102964731 A CN 2012102964731A CN 201210296473 A CN201210296473 A CN 201210296473A CN 102854500 A CN102854500 A CN 102854500A
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distance measuring
measuring signal
uni
directional wireless
emitter
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郭晓鹏
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Abstract

The embodiment of the invention discloses a unidirectional wireless ranging method for vehicles. The method includes the following steps: a receiver receives the ranging signal transmitted by a transmitter arranged on a target vehicle, and the receiving time of the ranging signal received by the receiver is recorded; according to the frequency of the ranging signal, the transmission time of the ranging signal transmitted by the transmitter is acquired; and according to the time difference between the transmission time of the ranging signal and the receiving time of the ranging signal received by the receiver, the distance between the target vehicle with the transmitter and the receiver is calculated. The embodiment of the invention also discloses a unidirectional wireless ranging device and the transmitter for vehicles. The adoption of the invention can realize non-return or one-way wireless ranging, shorten the response time for ranging and reduce the transmission loss of ranging signals and the error of received transmitted wireless ranging signals as the result of the affection of obstacles.

Description

Uni-directional wireless distance-finding method and device on a kind of vehicle
Technical field
The present invention relates to the wireless distance finding technology, relate in particular to a kind of uni-directional wireless distance-finding method and device.
Background technology
Wireless distance finding, radio range finding are namely determined the technology of its distance by measuring thing target radio transmission signal.The application in daily life of wireless distance finding technology is more and more general, has been widely used in the fields such as aircraft radar, marine radar.Existing wireless distance finding method generally all is to be transmitted into back and forth T.T./2 that then measured target return from transmitting terminal and then to multiply by the distance that wireless velocity of propagation is calculated measured target by calculating radio, the defective that the method exists is, when having barrier between transmitting terminal and the measured target, can impact measurement result, how to reduce this impact, become a direction of wireless distance finding technical development.
Summary of the invention
In view of this, the embodiment of the invention provides a kind of uni-directional wireless distance-finding method and device, can reduce the radio consumption and the error effect that cause on the road because returning.
In order to solve the problems of the technologies described above, the embodiment of the invention provides the distance-finding method of the uni-directional wireless on a kind of vehicle, and described method comprises:
Receive the distance measuring signal of the emitter emission that is located on the target vehicle by receiving trap, and the record receiving trap receives the time of reception of described distance measuring signal;
Launch the launch time of described distance measuring signal according to the frequency acquisition emitter of described distance measuring signal;
According to the mistiming that launch time and the described receiving trap of described distance measuring signal receives the time of reception of distance measuring signal, calculate the target vehicle at described emitter place and the distance of receiving trap.
Wherein, described method also comprises:
The receiving trap that obtains at least three diverse locations receives respectively the time of reception of distance measuring signal;
According to the mistiming that receives respectively the time of reception of described distance measuring signal launch time with described three receiving traps of described distance measuring signal, calculate described emitter respectively with the distance of described at least three receiving traps;
According to described emitter respectively with the distance of described at least three receiving traps, calculate the relative position of the target vehicle at described emitter place.
Wherein, described method also comprises:
The relative position of the described target vehicle of at least twice calculating;
According to the relative position of the described at least twice described target vehicle that calculates and the time interval of described at least twice calculating, obtain direction of relative movement and the speed of described target vehicle.
Wherein, described method also comprises:
According to any or a plurality of parameter in relative position, direction of relative movement and the speed of described target vehicle, send the alarm for described target vehicle.
Wherein, described frequency acquisition emitter according to described distance measuring signal is at launch time of launching described distance measuring signal:
In the corresponding relation of the frequency of default distance measuring signal and launch time, search the launch time corresponding with the frequency of described distance measuring signal according to the frequency of described distance measuring signal.
Accordingly, the embodiment of the invention also provides the distance measuring equipment of the uni-directional wireless on a kind of vehicle, and described uni-directional wireless distance measuring equipment comprises:
Receiving trap is used for receiving the distance measuring signal of the emitter emission that is located on the target vehicle and the time of reception that record receives described distance measuring signal;
Launch time, acquisition module was used for the launch time of launching described distance measuring signal according to the frequency acquisition emitter of described distance measuring signal;
Distance calculation module according to the mistiming that launch time and the described receiving trap of described distance measuring signal receives the time of reception of distance measuring signal, is calculated the target vehicle at described emitter place and the distance of receiving trap.
Wherein, the uni-directional wireless distance measuring equipment on the described vehicle comprises the receiving trap of three diverse locations at least, and the distance measuring signal that sends for receiving and transmitting unit also records respectively the time of reception that receives separately described distance measuring signal;
Described distance calculation module is used for respectively receiving according to the launch time of described distance measuring signal and at least three receiving traps the mistiming of the time of reception of described distance measuring signal, calculate described emitter respectively with the distance of described at least three receiving traps;
Locating module, be used for according to described emitter respectively with the distance of described at least three receiving traps, calculate the relative position of the target vehicle at described emitter place.
Wherein, the uni-directional wireless distance measuring equipment on the described vehicle also comprises:
The motion determination module for the relative position of the described target vehicle that calculates according to described locating module at least twice and the time interval of described at least twice calculating, is obtained direction of relative movement and the speed of described target vehicle.
Wherein, the uni-directional wireless distance measuring equipment on the described vehicle also comprises:
Alarm module is used for any or a plurality of parameter according to relative position, direction of relative movement and the speed of described target vehicle, sends the alarm for described target vehicle.
Wherein, described launch time, acquisition module comprised:
The corresponding relation storage unit is used for preserving the frequency of default distance measuring signal and the corresponding relation of launch time;
Search the unit launch time, in the corresponding relation of the frequency of described default distance measuring signal and launch time, search the launch time corresponding with the frequency of the described distance measuring signal that receives according to the frequency of described distance measuring signal.
Wherein, the uni-directional wireless distance measuring equipment on the described vehicle also comprises:
The distance measuring signal transmitter module is used for according to the outside distance measuring signal that sends different frequency launch time.
Correspondingly, the embodiment of the invention also provides the emitter of the uni-directional wireless distance measuring signal on a kind of vehicle, and described uni-directional wireless distance measuring signal emitter comprises:
The transmission frequency determination module is used for obtaining the frequency of determining the emission distance measuring signal launch time;
Transmitter module, the transmission frequency that is used for determining according to described transmission frequency determination module sends distance measuring signal, so that described uni-directional wireless distance measuring equipment calculates according to described distance measuring signal and the distance of described uni-directional wireless distance measuring signal emitter.
Implement the embodiment of the invention, has following beneficial effect: the corresponding relation that the transmitting terminal by being separately positioned on the wireless distance finding signal on the different vehicle and receiving end have been arranged transmission frequency and launch time, realized need not return and be the uni-directional wireless range finding, shortened range finding reaction time, reduce the transmission consumption of distance measuring signal and reduced and receive and propagate the error effect that the wireless distance finding signal is subject to barrier.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, the below will do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art, apparently, accompanying drawing in the following describes only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the structural representation of the first embodiment of a kind of uni-directional wireless distance measuring equipment of the present invention;
Fig. 2 is the structural representation of the second embodiment of a kind of uni-directional wireless distance measuring equipment of the present invention;
Fig. 3 is the first embodiment schematic flow sheet of a kind of uni-directional wireless distance-finding method of the present invention;
Fig. 4 is the second embodiment schematic flow sheet of a kind of uni-directional wireless distance-finding method of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that obtains under the creative work prerequisite.
Fig. 1 is the structural representation of the first embodiment of the uni-directional wireless distance measuring equipment on a kind of vehicle of the present invention, uni-directional wireless distance measuring equipment in the present embodiment can be arranged on user's the vehicle, the emitter of distance measuring signal can be arranged on other users' the vehicle, allows the user can understand in real time distance between other vehicles and own or the own vehicle.Uni-directional wireless distance measuring equipment in the present embodiment can comprise at least as shown in the figure:
Receiving trap 110 is used for receiving distance measuring signal and records the time of reception that receives described distance measuring signal.Described distance measuring signal can be the distance measuring signal of the single line wireless distance finding sender unit that arranges on other vehicles emission.
Launch time, acquisition module 120, were used for the launch time of launching described distance measuring signal according to the frequency acquisition emitter of described distance measuring signal.Concrete, emitter can be according to the frequency of determining described distance measuring signal launch time when the described distance measuring signal of emission, the relation of the frequency time of described launch time and distance measuring signal can be appointed for default, for example be 12:00:00 launch time, at this moment transmission frequency is 33333Hz, distance measuring signal of afterwards every mistake emission in 0.1 second, and transmission frequency increases 10Hz, until transmission frequency is circulated back to again 33333Hz when arriving 12:00:10 after 10 seconds, by that analogy.Launch time, acquisition module 120 further can comprise: the corresponding relation storage unit is used for preserving the frequency of default distance measuring signal and the corresponding relation of launch time; Search the unit launch time, in the corresponding relation of the frequency of described default distance measuring signal and launch time, search the launch time corresponding with the frequency of the described distance measuring signal that receives according to the frequency of described distance measuring signal.In the example of the corresponding relation of above-mentioned launch time and distance measuring signal frequency, the frequency of the distance measuring signal that 120 of acquisition modules need to receive according to receiving trap 110 can push back in the past and measured the time that emitter is launched this distance measuring signal launch time, for example to receive frequency at 12hh00mm12.00002ss be 33533 distance measuring signal to receiving trap, then can obtaining out emitter, to launch the time of this distance measuring signal be 12hh00mm12.00ss, and because the electromagnetic wave earth did not need for 1 second, so the time that emitter is launched this distance measuring signal obviously can not be 12hh00mm02.00ss or 12hh59mm52.00ss.
Distance calculation module 130 according to the mistiming that launch time and the described receiving trap of described distance measuring signal receives the time of reception of distance measuring signal, is calculated the target vehicle at described emitter place and the distance of receiving trap.With top example, be 0.00002 second with the mistiming that receives the time of reception of described distance measuring signal the launch time of described distance measuring signal, this time be multiply by electromagnetic wave propagation velocity constant 299792458m/s, namely can obtain the target vehicle at emitter place apart from uni-directional wireless distance measuring equipment 5995.84916m.
Fig. 2 is the structural representation of the second embodiment of the uni-directional wireless distance measuring equipment on a kind of vehicle of the present invention.Uni-directional wireless distance measuring equipment in the present embodiment to be comprising three receiving traps as example, and those skilled in the art can be readily appreciated that four or above receiving trap can apparently realize the present invention according to same way as.Uni-directional wireless distance measuring equipment in the second embodiment of the invention can comprise at least as shown in the figure:
The receiving trap of three diverse locations is respectively first receiving device 211, the second receiving trap 212 and the 3rd receiving trap 213, all is used for receiving distance measuring signal and records respectively the time of reception that receives separately described distance measuring signal.Concrete, 3 receiving traps to be comprised at least at least in the receiving trap of described three diverse locations not on same straight line, otherwise the location can't be realized.Above-mentioned three receiving traps can be separately positioned on three different parts of car front end and tailstock both sides of user's vehicle in the present embodiment, for example three receiving traps time of receiving respectively same distance measuring signal is respectively 12hh00mm12.000000101ss, 12hh00mm12.000000111ss and 12hh00mm12.0000001177ss.
Launch time, acquisition module 220 was for the launch time of launching described distance measuring signal according to the frequency acquisition emitter of described distance measuring signal.Concrete, acquisition module 220 obtained emitter to launch the mode of launch time of described distance measuring signal identical with the first embodiment launch time, transmission frequency and the corresponding relation of launch time are as example in the first embodiment, if the frequency that three receiving traps receive same distance measuring signal is 33533Hz, can learn that so equally it is 12hh00mm12.00ss that emitter is launched the launch time of this distance measuring signal.
Distance calculation module 230 is used for respectively receiving according to the launch time of described distance measuring signal and three receiving traps the mistiming of the time of reception of described distance measuring signal, calculate described emitter respectively with the distance of described at least three receiving traps.In the present embodiment, the mistiming that launch time and three receiving traps receive the time of reception of described distance measuring signal is 0.000000101s, 0.000000111s and 0.0000001177s respectively, multiply by target vehicle that the electromagnetic wave propagation velocity constant can obtain the emitter place and is respectively 30.279m, 33.277m and 35.286m with the distance of first receiving device 211, the second receiving trap 212 and the 3rd receiving trap 213 respectively.
Locating module 240, be used for according to described emitter respectively with the distance of described at least three receiving traps, calculate the relative position of the target vehicle at described emitter place.Concrete account form can be for example respectively according to being the center of circle in the position of each receiving trap, doing circle take the distance of emitter and this receiving trap as radius, three receiving traps do circle can have a common intersection point, be target vehicle with respect to the position of three receiving traps.
Further alternative, the uni-directional wireless distance measuring equipment in the present embodiment can also comprise:
Motion determination module 250 for the relative position of the described target vehicle that calculates according to described locating module 240 at least twice and the time interval of described at least twice calculating, is obtained direction of relative movement and the speed of described target vehicle.Can carry the identification information of emitter in the further described distance measuring signal, like this can be so that receiving trap can be identified according to its identification information that carries the distance measuring signal of same emitter emission when receiving a plurality of distance measuring signal, thus can follow the trail of and can not produce with other the relative position of target vehicle and obscure the relative position of same target vehicle.
Alarm module 260 is used for any or a plurality of parameter according to relative position, direction of relative movement and the speed of described target vehicle, sends the alarm for described target vehicle.In the specific implementation, the trigger condition that described alarm module 260 can also carry out described alarm according to the car brakeing of vehicle actual conditions setting distance according to the user, for example in the distance of the target vehicle in vehicle dead ahead less than the twice of the braking distance under the vehicle present speed, at this moment just should give the alarm to the user.
Further, the uni-directional wireless distance measuring equipment in the present embodiment can also comprise:
The distance measuring signal transmitter module is used for according to the outside distance measuring signal that sends different frequency launch time.The uni-directional wireless distance measuring equipment just not only can calculate according to the distance measuring signal that receives relative distance and the position of target vehicle like this, other distance measuring equipments can also outwards send distance measuring signal, so that can calculate according to the distance measuring signal of distance measuring signal transmitter module emission the distance of local terminal and relative position etc.
The below introduces the uni-directional wireless distance measuring signal emitter in the embodiment of the invention, uni-directional wireless distance measuring signal emitter in the embodiment of the invention can be arranged on user's the vehicle, can realize separately, also can be integrated in the equipment with described uni-directional wireless distance measuring equipment and realize.Uni-directional wireless distance measuring signal emitter in the concrete embodiment of the invention can comprise:
The transmission frequency determination module is used for obtaining the frequency of determining the emission distance measuring signal launch time.In the specific implementation, transmission frequency determination module in the uni-directional wireless distance measuring signal emitter can be preset the frequency of distance measuring signal and the corresponding relation of launch time, then according to the frequency of the distance measuring signal that determines the current launch time that is about to launch distance measuring signal to launch.
Transmitter module, the transmission frequency that is used for determining according to described transmission frequency determination module sends distance measuring signal, so that described uni-directional wireless distance measuring equipment calculates according to described distance measuring signal and the distance of described uni-directional wireless distance measuring signal emitter.
Fig. 3 is the first embodiment schematic flow sheet of the uni-directional wireless distance-finding method on a kind of vehicle of the present invention.In the uni-directional wireless distance measuring equipment of this embodiment realization on being installed in user's vehicle.The present embodiment flow process comprises as shown in the figure:
Step S301 receives the distance measuring signal of the emitter emission that is located on the target vehicle, and records the time of reception that receiving trap receives described distance measuring signal by receiving trap.Described distance measuring signal can be the distance measuring signal of the single line wireless distance finding sender unit that arranges on other vehicles emission.
Step S302, the launch time of launching described distance measuring signal according to the frequency acquisition emitter of described distance measuring signal.Concrete, the uni-directional wireless distance measuring equipment can be preset the frequency of distance measuring signal and the corresponding relation of launch time, can search the launch time corresponding with the frequency of described distance measuring signal in the corresponding relation of the frequency of default distance measuring signal and launch time according to the frequency of described distance measuring signal after receiving distance measuring signal.The frequency of described distance measuring signal and the corresponding relation of launch time are to make an appointment between uni-directional wireless distance measuring equipment and the emitter, can be according to the frequency of determining described distance measuring signal launch time when the described distance measuring signal of emission, the relation of the frequency time of described launch time and distance measuring signal can be for example: be 12:00:00 launch time, at this moment transmission frequency is 33333Hz, distance measuring signal of afterwards every mistake emission in 0.1 second, transmission frequency increases 10Hz, until transmission frequency is circulated back to again 33333Hz when arriving 12:00:10 after 10 seconds, by that analogy.In the example of the corresponding relation of above-mentioned launch time and distance measuring signal frequency, the uni-directional wireless distance measuring equipment only needs the frequency according to the distance measuring signal that receives to push back to measure the time that emitter is launched this distance measuring signal in the past, for example to receive frequency at 12hh00mm12.00002ss be 33533 distance measuring signal to receiving trap, then can obtaining out emitter, to launch the time of this distance measuring signal be 12hh00mm12.00ss, and because the electromagnetic wave earth did not need for 1 second, so the time that emitter is launched this distance measuring signal obviously can not be 12hh00mm02.00ss or 12hh59mm52.00ss.
Step S303 according to the mistiming that launch time and the described receiving trap of described distance measuring signal receives the time of reception of distance measuring signal, calculates the target vehicle at described emitter place and the distance of receiving trap.With top example, be 0.00002 second with the mistiming that receives the time of reception of described distance measuring signal the launch time of described distance measuring signal, this time be multiply by electromagnetic wave propagation velocity constant 299792458m/s, namely can obtain the target vehicle at emitter place apart from uni-directional wireless distance measuring equipment 5995.84916m.
Fig. 4 is the second embodiment schematic flow sheet of a kind of uni-directional wireless distance-finding method on the vehicle of the present invention.Uni-directional wireless distance measuring equipment in the present embodiment comprises three receiving traps, is separately positioned on the diverse location of user's vehicle, and the realization flow in the present embodiment comprises as shown in the figure:
Step S401, the receiving trap that obtains at least three diverse locations receives respectively the time of reception of distance measuring signal.The present embodiment is take three receiving traps as example, and those skilled in the art can be readily appreciated that four or above receiving trap can apparently realize the present invention according to same way as.In the specific implementation, 3 receiving traps to be comprised at least at least in the receiving trap of described three diverse locations not on same straight line, otherwise the location can't be realized.Described three receiving traps can be separately positioned on three different parts of car front end and tailstock both sides of user's vehicle in the present embodiment, the time that three receiving traps receive respectively same distance measuring signal in the present embodiment is respectively 12hh00mm12.000000101ss, 12hh00mm12.000000111ss and 12hh00mm12.0000001177ss.
Step S402, the launch time of launching described distance measuring signal according to the frequency acquisition emitter of described distance measuring signal.Obtaining emitter, to launch the mode of launch time of described distance measuring signal identical with the first embodiment, transmission frequency and the corresponding relation of launch time are as example in the first embodiment, the frequency that three receiving traps receive same distance measuring signal in the present embodiment is 33533Hz, and can obtaining so emitter, to launch the launch time of this distance measuring signal be 12hh00mm12.00ss.
Step S403, according to the mistiming that receives respectively the time of reception of described distance measuring signal launch time with described three receiving traps of described distance measuring signal, calculate described emitter respectively with the distance of described at least three receiving traps.Concrete, in the present embodiment, the mistiming that launch time and three receiving traps receive the time of reception of described distance measuring signal is 0.000000101s, 0.000000111s and 0.0000001177s respectively, multiply by target vehicle that the electromagnetic wave propagation velocity constant can obtain the emitter place and is respectively 30.279m, 33.277m and 35.286m with the distance of three receiving traps respectively.
Step S404, according to described emitter respectively with the distance of described at least three receiving traps, calculate the relative position of the target vehicle at described emitter place.Concrete account form can be for example respectively according to being the center of circle in the position of each receiving trap, doing circle take the distance of emitter and this receiving trap as radius, three receiving traps do circle can have a common intersection point, be target vehicle with respect to the position of three receiving traps.
Step S405 according to the relative position of the described at least twice described target vehicle that calculates and the time interval of described at least twice calculating, obtains direction of relative movement and the speed of described target vehicle.Can carry the identification information of emitter in the further described distance measuring signal, like this can be so that receiving trap can be identified according to its identification information that carries the distance measuring signal of same emitter emission when receiving a plurality of distance measuring signal, thus can follow the trail of and can not produce with other the relative position of target vehicle and obscure the relative position of same target vehicle.
Step S406 according to any or a plurality of parameter in relative position, direction of relative movement and the speed of described target vehicle, sends the alarm for described target vehicle.In the specific implementation, the trigger condition that the uni-directional wireless distance measuring equipment can also carry out described alarm according to the car brakeing of vehicle actual conditions setting distance according to the user, for example in the distance of the target vehicle in vehicle dead ahead less than the twice of the braking distance under the vehicle present speed, at this moment just should give the alarm to the user.
Transmitting terminal and the receiving end corresponding relation of having arranged transmission frequency and launch time of the embodiment of the invention by being separately positioned on the wireless distance finding signal on the different vehicle, realized need not return and be the uni-directional wireless range finding, shortened range finding reaction time, reduce the transmission consumption of distance measuring signal and reduced and receive and propagate the error effect that the wireless distance finding signal is subject to barrier.
One of ordinary skill in the art will appreciate that all or part of flow process that realizes in above-described embodiment method, to come the relevant hardware of instruction to finish by computer program, described program can be stored in the computer read/write memory medium, this program can comprise the flow process such as the embodiment of above-mentioned each side method when carrying out.Wherein, described storage medium can be magnetic disc, CD, read-only store-memory body (Read-Only Memory, ROM) or random store-memory body (Random Access Memory, RAM) etc.
Above disclosed is preferred embodiment of the present invention only, certainly can not limit with this interest field of the present invention, and the equivalent variations of therefore doing according to claim of the present invention still belongs to the scope that the present invention is contained.

Claims (12)

1. the uni-directional wireless distance-finding method on the vehicle is characterized in that, described method comprises:
Receive the distance measuring signal of the emitter emission that is located on the target vehicle by receiving trap, and the record receiving trap receives the time of reception of described distance measuring signal;
Launch the launch time of described distance measuring signal according to the frequency acquisition emitter of described distance measuring signal;
According to the mistiming that launch time and the described receiving trap of described distance measuring signal receives the time of reception of distance measuring signal, calculate the target vehicle at described emitter place and the distance of receiving trap.
2. the uni-directional wireless distance-finding method on the vehicle as claimed in claim 1 is characterized in that, described method also comprises:
The receiving trap that obtains at least three diverse locations receives respectively the time of reception of distance measuring signal;
According to the mistiming that receives respectively the time of reception of described distance measuring signal launch time with described three receiving traps of described distance measuring signal, calculate described emitter respectively with the distance of described at least three receiving traps;
According to described emitter respectively with the distance of described at least three receiving traps, calculate the relative position of the target vehicle at described emitter place.
3. the uni-directional wireless distance-finding method on the vehicle as claimed in claim 2 is characterized in that, described method also comprises:
The relative position of the described target vehicle of at least twice calculating;
According to the relative position of the described at least twice described target vehicle that calculates and the time interval of described at least twice calculating, obtain direction of relative movement and the speed of described target vehicle.
4. such as the uni-directional wireless distance-finding method on each described vehicle in the claim 3, it is characterized in that, described method also comprises:
According to any or a plurality of parameter in relative position, direction of relative movement and the speed of described target vehicle, send the alarm for described target vehicle.
5. such as the uni-directional wireless distance-finding method on each described vehicle in the claim 1 ~ 4, it is characterized in that, be the launch time that described frequency acquisition emitter according to described distance measuring signal is launched described distance measuring signal:
In the corresponding relation of the frequency of default distance measuring signal and launch time, search the launch time corresponding with the frequency of described distance measuring signal according to the frequency of described distance measuring signal.
6. the uni-directional wireless distance measuring equipment on the vehicle is characterized in that, described uni-directional wireless distance measuring equipment comprises:
Receiving trap is used for receiving the distance measuring signal of the emitter emission that is located on the target vehicle and the time of reception that record receives described distance measuring signal;
Launch time, acquisition module was used for the launch time of launching described distance measuring signal according to the frequency acquisition emitter of described distance measuring signal;
Distance calculation module according to the mistiming that launch time and the described receiving trap of described distance measuring signal receives the time of reception of distance measuring signal, is calculated the target vehicle at described emitter place and the distance of receiving trap.
7. the uni-directional wireless distance measuring equipment on the vehicle as claimed in claim 6, it is characterized in that, described uni-directional wireless distance measuring equipment comprises the receiving trap of three diverse locations at least, and the distance measuring signal that sends for receiving and transmitting unit also records respectively the time of reception that receives separately described distance measuring signal;
Described distance calculation module is used for respectively receiving according to the launch time of described distance measuring signal and at least three receiving traps the mistiming of the time of reception of described distance measuring signal, calculate described emitter respectively with the distance of described at least three receiving traps;
Locating module, be used for according to described emitter respectively with the distance of described at least three receiving traps, calculate the relative position of the target vehicle at described emitter place.
8. the uni-directional wireless distance measuring equipment on the vehicle as claimed in claim 7 is characterized in that, described uni-directional wireless distance measuring equipment also comprises:
The motion determination module for the relative position of the described target vehicle that calculates according to described locating module at least twice and the time interval of described at least twice calculating, is obtained direction of relative movement and the speed of described target vehicle.
9. the uni-directional wireless distance measuring equipment on the vehicle as claimed in claim 8 is characterized in that, described uni-directional wireless distance measuring equipment also comprises:
Alarm module is used for any or a plurality of parameter according to relative position, direction of relative movement and the speed of described target vehicle, sends the alarm for described target vehicle.
10. the uni-directional wireless distance measuring equipment on the vehicle as claimed in claim 6 is characterized in that, described launch time, acquisition module comprised:
The corresponding relation storage unit is used for preserving the frequency of default distance measuring signal and the corresponding relation of launch time;
Search the unit launch time, in the corresponding relation of the frequency of described default distance measuring signal and launch time, search the launch time corresponding with the frequency of the described distance measuring signal that receives according to the frequency of described distance measuring signal.
11. the uni-directional wireless distance measuring equipment as on each described vehicle in the claim 6 ~ 10 is characterized in that, described uni-directional wireless distance measuring equipment also comprises:
The distance measuring signal transmitter module is used for according to the outside distance measuring signal that sends different frequency launch time.
12. the uni-directional wireless distance measuring signal emitter on the vehicle is characterized in that, described uni-directional wireless distance measuring signal emitter comprises:
The transmission frequency determination module is used for obtaining the frequency of determining the emission distance measuring signal launch time;
Transmitter module, the transmission frequency that is used for determining according to described transmission frequency determination module sends distance measuring signal, so that described uni-directional wireless distance measuring equipment calculates according to described distance measuring signal and the distance of described uni-directional wireless distance measuring signal emitter.
CN2012102964731A 2012-08-20 2012-08-20 Unidirectional wireless ranging method and unidirectional wireless ranging device for vehicles Pending CN102854500A (en)

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CN104457742A (en) * 2014-12-05 2015-03-25 歌尔声学股份有限公司 Target positioning method and target positioning equipment of object
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CN105917247A (en) * 2013-11-21 2016-08-31 通用电气公司 Geolocation aid and system
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