CN109085591A

CN109085591A - A kind of distance measuring method and terminal

Info

Publication number: CN109085591A
Application number: CN201710454480.2A
Authority: CN
Inventors: 狄希; 潘明东
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2017-06-14
Filing date: 2017-06-14
Publication date: 2018-12-25

Abstract

The invention discloses a kind of distance measuring methods, are applied to first terminal, and the first terminal includes at least one directional aerial；It include: to obtain transmitting signal；The transmitting signal that will acquire is modulated processing, and is radiated by least one described directional aerial, wherein the frequency of the transmitting signal matches with the working frequency of corresponding directional aerial；The first reflection signal is received by least one described directional aerial, the first reflection signal is that the transmitting signal of at least one directional antenna radiation encounters the signal that barrier back reflection returns；For each directional aerial, received first reflection signal is subjected to demodulation process, and the first reflection signal issues by treated；The the first reflection signal issued is for determining the distance between the barrier and corresponding directional aerial.The present invention further simultaneously discloses a kind of first terminal, second terminal.

Description

A kind of distance measuring method and terminal

Technical field

The present invention relates to antenna technical field more particularly to a kind of distance measuring method and terminals.

Background technique

With the continuous development of society, nowadays automobile has become the most important vehicles in our lives.Parking thunder It reaches, when reverse image etc. is as reversing or system that the safety aid for the when of parking must fill, it must when having become selection automobile Indispensable function.

However, these modes can only all detect the barrier within the scope of certain altitude, for exceeding this altitude range Barrier, be undetectable, therefore there are visual angle blind zones, it is difficult to meet the increasingly harsher driving demand of driver.

Therefore, it needs to find a kind of solution that can detect the barrier beyond certain altitude range.

Summary of the invention

In view of this, can detect an embodiment of the present invention is intended to provide a kind of distance measuring method and terminal beyond certain high Spend the barrier of range.

The technical solution of the embodiment of the present invention is achieved in that

The embodiment of the present invention provides a kind of distance measuring method, is applied to first terminal, and the first terminal includes at least one Directional aerial；The described method includes:

Obtain transmitting signal；

The transmitting signal that will acquire is modulated processing, and is radiated by least one described directional aerial, wherein The frequency of the transmitting signal matches with the working frequency of corresponding directional aerial；

The first reflection signal is received by least one described directional aerial, the first reflection signal is described at least one The transmitting signal of a directional antenna radiation encounters the signal that barrier back reflection returns；

For each directional aerial, received first reflection signal is subjected to demodulation process, and will that treated is first anti- Penetrate signal sending；The the first reflection signal issued is for determining the distance between the barrier and corresponding directional aerial.

In above scheme, the acquisition emits signal, comprising:

Receive the transmitting signal that second terminal is sent；Alternatively,

The first information that second terminal is sent is received, generates the transmitting signal according to the first information.

In above scheme, the first terminal further includes at least one omnidirectional antenna；

Correspondingly, the transmitting signal after modulation treatment also passes through at least one described omnidirectional antenna and is radiated；

The second reflection signal is received by least one described omnidirectional antenna, the second reflection signal is described at least one The transmitting signal of a omnidirectional antenna radiation encounters the signal that barrier back reflection returns；

For each omnidirectional antenna, received second reflection signal is subjected to demodulation process, and will that treated is second anti- Penetrate signal sending；The the second reflection signal issued is for determining the distance between barrier and corresponding omnidirectional antenna；Wherein, described Omnidirectional antenna can receive the second reflection signal within the scope of first distance；The directional aerial can be in second distance range Inside receive the first reflection signal；The first distance is less than the second distance.

In above scheme, after being modulated, before radiation-emitting signal, the method also includes:

Transmitting signal is successively subjected to frequency hopping modulation, filtering processing；Transmitting signal after filtering processing is radiated；

Correspondingly, before being demodulated, the method also includes:

Reflection signal is successively subjected to frequency hopping demodulation, filtering processing；Reflection signal after filtering processing is carried out solution to mediate Reason.

In above scheme, the method also includes:

The distance between the barrier that reception second terminal is sent and respective antenna are simultaneously shown.

The embodiment of the present invention provides a kind of distance measuring method, is applied to second terminal, which comprises

Receive the first reflection signal that first terminal is sent；Described first reflection at least one directional aerial spoke of characterization The transmitting signal penetrated encounters the signal that barrier back reflection returns；

Using the first reflection signal, and in conjunction with the corresponding transmitting signal of the first reflection signal, barrier is determined The distance between corresponding directional aerial；The frequency of the transmitting signal matches with the working frequency of corresponding directional aerial.

In above scheme, before the first reflection signal for receiving first terminal transmission, the method also includes:

The transmitting signal is generated, and is sent to the first terminal；Alternatively,

The first information is generated, and is sent to the first terminal, the first information generates the hair for first terminal Penetrate signal.

In above scheme, the method also includes:

Receive the second reflection signal that first terminal is sent；At least one omnidirectional antennas described in the second reflection characterization The transmitting signal of beta radiation encounters the signal that barrier back reflection returns；

Using the second reflection signal, and in conjunction with the corresponding transmitting signal of the second reflection signal, barrier is determined The distance between corresponding omnidirectional antenna.

It is described using the first reflection signal in above scheme, and in conjunction with the corresponding transmitting of the first reflection signal Signal determines the distance between barrier and corresponding directional aerial, comprising:

According to the phase parameter of the phase parameter of transmitting signal and the first reflection signal, transmitting signal and the first reflection are determined The phase difference of signal determines the distance between barrier and corresponding directional aerial according to the phase difference.

It is described using the second reflection signal in above scheme, and in conjunction with the corresponding transmitting of the second reflection signal Signal determines the distance between barrier and corresponding omnidirectional antenna, comprising:

According to the receiving time of the sending time of transmitting signal and the second reflection signal, sending time and receiving time are determined Time difference, the distance between barrier and corresponding omnidirectional antenna are determined according to the time difference.

In above scheme, the method also includes:

The distance between the barrier and respective antenna are sent to first terminal.

The embodiment of the present invention provides a kind of first terminal, and the first terminal includes at least one directional aerial, and described the One terminal includes:

Module is obtained, for obtaining transmitting signal；

First modulation module, the transmitting signal for will acquire is modulated processing, and passes through at least one described orientation Antenna is radiated, wherein the frequency of the transmitting signal matches with the working frequency of corresponding directional aerial；

First receiving module, for receiving the first reflection signal by least one described directional aerial, described first is anti- It penetrates the transmitting signal that signal is at least one directional antenna radiation and encounters the signal that barrier back reflection returns；

Received first reflection signal is carried out demodulation process for being directed to each directional aerial by the first demodulation module, and By treated, the first reflection signal is issued；The the first reflection signal issued is for determining the barrier and corresponding directional aerial The distance between.

In above scheme, the first terminal is additionally provided at least one omnidirectional antenna, the first terminal further include:

Second modulation module carries out spoke for the transmitting signal after modulation treatment to be passed through at least one described omnidirectional antenna It penetrates；

Second receiving module, for receiving the second reflection signal by least one described omnidirectional antenna, described second is anti- It penetrates the transmitting signal that signal is at least one omnidirectional antenna radiation and encounters the signal that barrier back reflection returns；

Received second reflection signal is carried out demodulation process for being directed to each omnidirectional antenna by the second demodulation module, and By treated, the second reflection signal is issued；The the second reflection signal issued is for determining between barrier and corresponding omnidirectional antenna Distance；Wherein, the omnidirectional antenna can receive the second reflection signal within the scope of first distance；The directional aerial energy It is enough that the first reflection signal is received within the scope of second distance；The first distance is less than the second distance.

The embodiment of the present invention provides a kind of second terminal, and the second terminal includes:

Third receiving module, for receiving the first reflection signal of first terminal transmission；The first reflection characterization The transmitting signal of at least one directional antenna radiation encounters the signal that barrier back reflection returns；

First determining module, for reflecting the corresponding hair of signal using the first reflection signal, and in conjunction with described first Signal is penetrated, determines the distance between barrier and corresponding directional aerial；Frequency and the corresponding directional aerial of the transmitting signal Working frequency matches.

In above scheme, the second terminal further include:

4th receiving module, for receiving the second reflection signal of first terminal transmission；The second reflection characterization The transmitting signal of at least one omnidirectional antenna radiation encounters the signal that barrier back reflection returns；

Second determining module, for reflecting the corresponding hair of signal using the second reflection signal, and in conjunction with described second Signal is penetrated, determines the distance between barrier and corresponding omnidirectional antenna.

The embodiment of the present invention provides a kind of computer readable storage medium, is stored thereon with computer program, the computer The step of any one distance measuring method described above is realized when program is executed by processor.

Distance measuring method provided in an embodiment of the present invention and terminal, the first terminal include at least one directional aerial；It obtains Take transmitting signal；The transmitting signal that will acquire is modulated processing, and is radiated by least one described directional aerial, In, the frequency of the transmitting signal matches with the working frequency of corresponding directional aerial；Pass through at least one described directional aerial The first reflection signal is received, the first reflection signal is that the transmitting signal of at least one directional antenna radiation encounters obstacle The signal that object back reflection returns；For each directional aerial, received first reflection signal is subjected to demodulation process, and will be after processing First reflection signal issue；Issue first reflection signal be used for determine between the barrier and corresponding directional aerial away from From.In the embodiment of the present invention, firstly, passing through the transmitting signal after at least one directional antenna radiation modulation treatment；Then, pass through At least one directional aerial receives the first reflection signal, and the first reflection signal is carried out demodulation process；Finally, being mediated according to solution The first reflection signal after reason determines the distance between the barrier and corresponding directional aerial.Due to using directional aerial, So can radiation angle by adjusting directional aerial and direction, detect the barrier beyond certain altitude range.

Detailed description of the invention

Fig. 1 is the schematic diagram of parking radar working principle in the related technology；

Fig. 2 is the implementation process schematic diagram of one distance measuring method of the embodiment of the present invention；

Fig. 3 is the implementation process schematic diagram of two distance measuring method of the embodiment of the present invention；

Fig. 4 is the composed structure schematic diagram of range-measurement system of the embodiment of the present invention；

Fig. 5 is the signal radiation schematic diagram of directional aerial of the embodiment of the present invention；

Fig. 6 is the signal radiation schematic diagram of omnidirectional antenna of the embodiment of the present invention；

Fig. 7 a is that transmitting signal of the embodiment of the present invention encounters schematic diagram of the barrier there is no diffraction phenomena；

Fig. 7 b is the schematic diagram that the embodiment of the present invention emits that signal encounters barrier generation diffraction phenomena；

Fig. 8 is the schematic diagram that the embodiment of the present invention controls processing subsystem；

Fig. 9 is the composed structure schematic diagram of three first terminal of the embodiment of the present invention；

Figure 10 is the composed structure schematic diagram of four second terminal of the embodiment of the present invention.

Specific embodiment

The characteristics of in order to more fully hereinafter understand the embodiment of the present invention and technology contents, with reference to the accompanying drawing to this hair The realization of bright embodiment is described in detail, appended attached drawing purposes of discussion only for reference, is not used to limit the present invention.

In general, the system that safety aid when moving backward or when parking must fill has parking radar, reverse image system etc..

Wherein, parking radar is made of the part such as ultrasonic sensor probe, controller and buzzer, it can with sound or Person more intuitively shows the case where informing driver's peripheral obstacle, when relieving driver and parking, move backward and start vehicle Caused puzzlement is visited in front and back, improves the safety of driving.For example, parking radar is certainly when automobile shift bar is linked into and reverses gear Dynamic to start to work, when ultrasonic sensor probe detects rear object, buzzer issues warning, when vehicle continues reversing, The frequency of audio warning can gradually be accelerated, and yowl sound is eventually become.Fig. 1 is the schematic diagram of parking radar working principle, such as Fig. 1 institute Show, when automobile is in state of rolling backward, parking radar starts to start, and the ultrasonic sensor probe of parking radar emits ultrasonic wave After signal, then detect the echo-signal of ultrasonic wave.Wherein, the transmitting of ultrasonic wave is to emit pulse train signal, warp by controller After amplifying circuit amplification, launched by the ultrasonic sensor probe of parking radar.When detecting barrier in effective range Hinder object, the echo-signal that the shock of ultrasonic wave returns can allow detected by the detector of parking radar, and controller calculates completion The distance results of body of a motor car and barrier are output to warning device, are issued and are warned by buzzer.

Parking radar needs to carry out vehicle body punching installation, and there are biggish detection blind areas, cannot excessively rely on, with In lower these types situation, parking radar will not make any reaction: (1) excessively short barrier.In general, it is lower than Ultrasonic sensor probe center 10~15cm barrier below is possible to be popped one's head in ignore, and obstacle distance vehicle Body distance is closer, this height value will also decrease, and risk also increases with it.(2) meticulous barrier.Due to ultrasound The ultrasonic signal of wave sensor probe transmitting is relatively narrow, therefore there is biggish blind areas detecting thinner barrier, in this way, It is used to obstruct the isolation pile of vehicle on some roads, the oblique pull wirerope on electric pole is all dangerous goods.(3) ditch.Parking thunder Up to being for detecting barrier, road surface is if there is ditch before and after vehicle body, then parking radar can never make a response.

Reverse image system meeting turn on automatically when automotive gear lever is linked into reverse gear is located at the backup camera of the tailstock, by vehicle Situation is shown on the liquid crystal display or rearview mirror controlled in onboard system afterwards.

Reverse image system is applied to be needed driver first to observe the liquid crystal display controlled in onboard system to show in reversing Vehicle body surrounding situation, on condition that needing people to go to see just can go and find out what's going on.In addition, with the reduction degree of camera in practical operation There is very big relationship, for example, the too big camera of extensive angle can allow the scenery of picture both sides all to generate distortion, to influence to drive The correct judgement of member.Reverse image device based on single rearview camera can only see within the scope of the certain altitude of vehicle body dead astern Image, and vehicle body surrounding situation can not be seen clearly simultaneously, there are visual angle blind zones.And newest 360 degree of panoramas reverse image technology, It needs that the wide-angle camera of all field ranges in vehicle body periphery can be covered in motor vehicle environment installation, and at least needs 4 or more Wide-angle camera is only present at present in high price vehicle.

In conclusion parking radar, reverse image system can only all detect the barrier within the scope of certain altitude, for Barrier beyond this altitude range is undetectable, therefore there are visual angle blind zones, it is difficult to it is more and more severe to meet driver The driving demand at quarter.

In addition, state-of-the-art reverse image is 360 degree of panorama reverse images at present, cost is very high, and only part high price The high-end vehicle in position can just select to install.

Based on this, in various embodiments of the present invention: using the characteristic of directional aerial, in conjunction with the frequency with directional aerial Matched signal reflection characteristic, to carry out ranging.

Embodiment one

As shown in Fig. 2, distance measuring method is described in detail by taking first terminal side as an example in the present embodiment, comprising the following steps:

Step 201: obtaining transmitting signal.

Here, first terminal includes (being provided with) at least one directional aerial；Wherein, directional aerial refer to some or Emit on certain several specific direction or reception electromagnetic wave is especially strong, and emitting in other directions and receiving electromagnetic wave is then zero Or a kind of minimum antenna.The parameter of directional aerial includes: working frequency, horizontal lobe width, pitching lobe width, horizontal spoke Firing angle, vertical radiation angle.

Here, when practical application, first terminal, which can be arranged in, to be needed to measure in the equipment with obstacle distance, such as traffic Tool etc., and the common vehicles can be automobile, when first terminal is arranged on automobile, the position of directional aerial and automobile The relationship of setting can be with are as follows: the directional aerial may be provided at body of a motor car it is left front, right before, left back, right back to etc.；Practical application When, further centered position before body of a motor car can also be arranged in the directional aerial.It similarly, can also be in automobile A directional aerial is arranged in the position centered behind of vehicle body again, with comprehensive detection barrier.

Here, the acquisition emits signal, comprising:

Receive the transmitting signal that second terminal is sent；Alternatively,

Wherein, when practical application, second terminal periodically can send transmitting signal or the first information to first terminal, with The transmitting signal or the first information that send first terminal can with periodic receipt second terminal.

Alternatively, second terminal can also be sent instructions to by user, second terminal responds described instruction, sends out to first terminal Send transmitting signal or the first information.

Since the first information is for generating transmitting signal, so the first information can specifically include for generating transmitting signal Amplitude, frequency, phase parameter etc..

Step 202: the transmitting signal that will acquire is modulated processing, and carries out spoke by least one described directional aerial It penetrates；

Wherein, the frequency of the transmitting signal matches with the working frequency of corresponding directional aerial.

Here, modulation is handled transmitting signal, so that it becomes being suitble to the process of transmission form.It is to believe transmitting Number it is changed into the very high bandpass signal of frequency for a relative transmission signal.Bandpass signal is called modulated signal, and emits Signal is called modulated signal.

Wherein, modulation can be analog-modulated, be also possible to digital modulation.Analog-modulated refers to modulated signal and carrier wave is all The modulation system of continuous wave；Digital modulation refers to that modulated signal is modulation system discrete, that carrier wave is continuous wave.

Specifically, it is modulated with three kinds of amplitude modulation, frequency modulation and phase modulation citation forms, by taking digital modulation as an example, modulation system includes: Amplitude shift keying method (ASK, Amplitude Shift Keying) is the amplitude with modulated signal modulation carrier wave；Phase-shift keying (PSK, Phase Shift Keying) is the phase with modulated signal modulation carrier wave；Binary phase shift keying method (BPSK, Binary Phase Shift Keying) it is to differ 180 degree with two phase offsets of modulated signal modulation carrier wave；Frequency displacement key Control method (FSK, Frequency-shift keying) is the frequency with modulated signal modulation carrier wave；Quadrature amplitude modulation method (QAM, Quadrature Amplitude Modulation) is the amplitude and phase with modulated signal modulation carrier wave.

Using any one modulation system in analog-modulated or digital modulation, the transmitting signal that will acquire is modulated Processing, and radiated by least one described directional aerial；Wherein, frequency and the corresponding directional aerial of the transmitting signal Working frequency match.

Here, the frequency of the transmitting signal matches with the working frequency of corresponding directional aerial, in particular to emits letter Number frequency, the working frequency of the frequency of modulated signal and directional aerial matches.

Here, when first terminal includes at least one directional aerial, each directional aerial has corresponding modulation circuit, The transmitting signal that first terminal will acquire is sent to corresponding directional aerial and is radiated after the modulation of corresponding modulating circuit.

Since the working frequency of directional aerial will be different according to the difference of producer, the frequency for emitting signal must It must match with the working frequency of directional aerial, for example, the operating frequency range of directional aerial is 1920-2170MHz, through toning System treated transmitting signal frequency also must be within the scope of 1920-2170MHz.

When practical application, the transmitting signal can be Wireless Fidelity (WiFi, Wireless Fidelity) signal etc..

When first terminal includes at least one directional aerial, the parameter of each directional aerial can be identical, can also not Together.

In order to improve the anti-interference ability and stability of system, can using frequency hopping to modulated transmitting signal into Row processing.

Based on this, in one embodiment, after being modulated, before radiation-emitting signal, the method also includes:

Transmitting signal is successively subjected to frequency hopping modulation, filtering processing；Transmitting signal after filtering processing is radiated.

Wherein, frequency hopping refers to that the carrier frequency of receiving-transmitting sides transmission signal carries out the communication of Discrete Change according to predetermined rule Mode, that is to say, that carrier frequency used in communication by pseudorandom variation code control and random jump, therefore, frequency hopping tune System is a kind of to carry out the frequency shift keyed modulation system of multifrequency with code sequence.Pseudo-random code sequence can be based on m-sequence, M sequence, inner The design such as institute (RS, Reed-Solomon) code.

Have to keep stringent synchronization using the receiving-transmitting sides of frequency hopping communications.Frequency hopping modulation and filtering are whole as one Body has good anti-interference ability, even if there is part frequency point disturbed, remains to carry out on other disturbed frequency points normal Communication.

Here, in actual conditions, frequency hopping modulation can also use adaptive frequency hopping skill using conventional frequency hopping Art, in real time removal fixation or semifixed interference carry out frequency hopping processing, to protect so that excellent channel collection be adaptive selected Hold good communications status.Wherein, fixed interference refers to that the interference issued when adjacent equipment fixes operation, semifixed interference refer to once in a while Interference caused by the equipment used.

Wherein, adaptive frequency hopping be built upon a kind of frequency on the basis of automatic channel quality analysis adaptively and power oneself The technology that suitable solution combines can make frequency hopping communications process avoid disturbed frequency hopping frequency point automatically, and with the smallest hair Penetrate power, it is minimum be trapped probability, achieve the purpose that keep high-quality communication for a long time on glitch-free frequency hopping channel.

Step 203: the first reflection signal is received by least one described directional aerial；

Here, after the first reflection signal encounters barrier for the transmitting signal of at least one directional antenna radiation The signal being reflected back.

Specifically, when first terminal includes at least one directional aerial, corresponding the is received by each directional aerial One reflection signal, the first reflection signal are that the transmitting signal of at least one directional antenna radiation encounters barrier back reflection time Signal.

Here, since the radiation length of directional aerial is distant, generally in 1000 meters, therefore, by directional antenna radiation Transmitting signal, after encountering barrier, can make emit signal phase change.

Here, since the horizontal radiation angle of directional aerial or vertical radiation angle are generally less than 90 degree, so practical application When, suitable directional aerial can be selected according to the actual demand of user, and determine the horizontal radiation angle of directional aerial and vertical The installation direction of radiation angle and directional aerial.

Step 204: being directed to each directional aerial, received first reflection signal is subjected to demodulation process, and will be after processing First reflection signal issue；

Here, the first reflection signal of sending is for determining the distance between the barrier and corresponding directional aerial.

Here, demodulation is usually to restore the process of transmitting signal, still, this hair from the modulated signal for carrying transmitting signal In bright embodiment, since the first reflection signal is that the transmitting signal of directional antenna radiation encounters the signal that barrier is reflected back, send out The phase for penetrating signal and the first reflection signal can change, therefore carry out that demodulation process obtains to the first reflection signal is phase The transmitting signal that position changes.

Wherein, the mode of demodulation includes sinusoidal amplitude demodulation, sine wave angle demodulation resonance and demodulation.Sine wave demodulation It is to restore the process of message, including non-coherent demodulation and coherent demodulation from the amplitude-modulated signal for carrying message.Sine wave angle solution Tune is the process for restoring message from the angle modulation wave for carrying message, including frequency demodulation and phase demodulating, wherein frequency demodulation one As completed by frequency discriminator, phase demodulating is generally completed by phase discriminator.

Using any one demodulation mode described above, received first reflection signal is subjected to demodulation process, and will place The first reflection signal after reason issues；The the first reflection signal issued is for determining between the barrier and corresponding directional aerial Distance.

Here, when first terminal includes at least one directional aerial, each directional aerial has corresponding demodulator circuit, Corresponding first reflection signal is received by each directional aerial, and received first reflection signal is sent into corresponding demodulation electricity Road carries out demodulation process.

Correspondingly, when carrying out frequency hopping processing to transmitting signal, before being demodulated, the method can also include:

Specifically, frequency hopping demodulation is under the control of synchronous circuit, and will be received by directional aerial first reflects signal Multiplied by the identical pseudo noise code used with frequency hopping modulation, the first reflection signal is subjected to demodulation process.Due to drawing in the channel Interference signal is entered, using filter, has filtered interference signal after frequency hopping demodulates, improve signal-to-noise ratio.

When practical application, in order to realize the comprehensive detection to the distance of barrier, the first terminal can be with Including (being provided with) at least one omnidirectional antenna；Wherein, omnidirectional antenna refers to that 360 degree are shown as on figure in the horizontal direction is all uniform Radiation, that is to say, that non-directional.The parameter of omnidirectional antenna include: working frequency, horizontal lobe width, pitching lobe width, Horizontal radiation angle.

Here, suppose that when first terminal is placed on the vehicles such as automobile, the positional relationship of omnidirectional antenna and automobile It can be with are as follows: the omnidirectional antenna may be provided at the upper and lower direction of body of a motor car.

When first terminal includes at least one omnidirectional antenna, the method also includes:

The transmitting signal that will acquire passes through modulation treatment, and the transmitting signal after modulation treatment also passes through that described at least one is complete It is radiated to antenna；

Here, second distance is generally 1000 meters or so, and first distance is generally 10 meters or so.

Here, the modulator approach that the first terminal comprising omnidirectional antenna uses can use modulation corresponding with directional aerial Method；Demodulation method can use demodulation method corresponding with directional aerial.

Here, the method can also include:

Receive the distance between barrier and corresponding directional aerial that second terminal is sent and barrier and correspondence omnidirectional antennas At least one of the distance between line is simultaneously shown.

That is, first terminal receives the barrier that second terminal is sent and the distance between respective antenna and is shown Show.

Here, when practical application, in order to realize the communication between first terminal and second terminal, first terminal and second is eventually End needs first to establish connection, and the mode for establishing connection can include but is not limited to Miracast, AirPlay, MirrorLink, shifting Dynamic terminal high-definition audio and video standard interface (MHL, Mobile High-Definition Link)/high-definition multimedia interface The connection of (HDMI, High Definition Multimedia Interface), universal serial bus (USB Link, Universal Serial Bus Link)。

Wherein, second terminal determines the distance between barrier and corresponding directional aerial, goes back root according to the first reflection signal According to the second reflection signal, determine the distance between barrier and corresponding omnidirectional antenna, and by barrier and corresponding directional aerial it Between distance and at least one of the distance between barrier and corresponding omnidirectional antenna be sent to first terminal and show, so as to The moving direction of the equipment of first terminal is installed in adjustment.

For example for, it is assumed that first terminal is mounted on the vehicles such as automobile, and the purpose of the display is: automobile The moving direction of automobile is adjusted when advance or reversing for avoiding barrier.

Here, when practical application, second terminal can also according to the deflection of each directional aerial and barrier with it is right The first distance between directional aerial is answered, determines the relative position of barrier with corresponding directional aerial, so as to be particularly shown Specific location of the barrier in vehicle body surrounding out.

Wherein, the direction angle information of directional aerial can be sent to second terminal by first terminal.

It is non-directional due to omnidirectional antenna, second terminal according to second between barrier and corresponding omnidirectional antenna away from From determination is shown by the overlay area of the circle of radius as barrier of second distance.

Embodiment two

As shown in figure 3, distance measuring method is described in detail by taking second terminal side as an example in the present embodiment, comprising the following steps:

Step 301: receiving the first reflection signal that first terminal is sent；

Here, the transmitting signal of at least one directional antenna radiation described in the first reflection characterization encounters barrier The signal that back reflection returns；

When practical application, before the first reflection signal for receiving first terminal transmission, the method also includes:

Wherein, since the first information is for generating transmitting signal, so the first information can specifically include for first eventually End generates amplitude, frequency, phase parameter of transmitting signal etc..

Here, before second terminal sends the first reflection signal or the first information to first terminal, second terminal and the One terminal needs to establish connection, and the mode for establishing connection includes but is not limited to Miracast, AirPlay, MirrorLink, MHL/ HDMI、USB Link。

Here, after second terminal sends the first reflection signal or the first information to first terminal, when will record transmission Between.

Step 302: using the first reflection signal, and in conjunction with the corresponding transmitting signal of the first reflection signal, really Determine the distance between barrier and corresponding directional aerial；

Here, the frequency of the transmitting signal matches with the working frequency of corresponding directional aerial.

Here, described using the first reflection signal, and in conjunction with the corresponding transmitting signal of the first reflection signal, really Determine the distance between barrier and corresponding directional aerial, comprising:

More specifically, second terminal is believed according to the first reflection that the phase parameter and first terminal of transmitting signal are sent Number phase parameter, calculate transmitting signal with first reflect signal phase difference；Then, signal is emitted according to phase difference calculating The sending time, (when receiving the first reflection signal, second terminal will record corresponding reception with the receiving time of the first reflection signal Time) between time difference；Finally, using the time difference, further according to transmitting signal and the first reflection signal in propagation medium Spread speed calculates the distance between barrier and corresponding directional aerial.

Then have using formula expression: assuming that the frequency of transmitting signal is f, emitting the angular frequency w=2 π f of signal, transmitting letter Number and first reflection signal phase difference beEmit issuing between time and the receiving time of the first reflection signal for signal Time difference isEmit the spread speed of signal and the first reflection signal in propagation mediumIn this way, barrier With the first distance between corresponding directional aerialWherein, c is electromagnetic wave rate, and n is Propagate the refractive index of the medium of current demand signal.

In one embodiment, when the first terminal is provided with omnidirectional antenna, the method can also include:

Here, described using the second reflection signal, and in conjunction with the corresponding transmitting signal of the second reflection signal, really Determine the distance between barrier and corresponding omnidirectional antenna, comprising:

More specifically, sending time is recorded after second terminal sends transmitting signal or the first information to first terminal, According to the receiving time of sending time and the second reflection signal, (when receiving the second reflection signal, second terminal be will record accordingly Receiving time), calculate the time difference between sending time and receiving time；Then, further according to transmitting signal and the second reflection Spread speed of the signal in propagation medium, calculates the distance between barrier and corresponding omnidirectional antenna.

Then have using formula expression: assuming that the sending time of transmitting signal is t1, the receiving time of the second reflection signal is T2, the time difference T2=t2-t1 between sending time and receiving time, emit signal and the second reflection signal is passing The spread speed broadcast in medium isIn this way, the second distance between barrier and corresponding omnidirectional antenna isWherein, c is electromagnetic wave rate, and n is the refraction for propagating the medium of current demand signal Rate.

When practical application, second terminal can also be by the distance between the barrier and corresponding directional aerial and the barrier At least one of the distance between object and corresponding omnidirectional antenna is hindered to be sent to first terminal, so as to according to obtained distance adjustment peace The moving direction of equipment equipped with first terminal.

Here, the second terminal includes mobile terminal such as mobile phone etc..

The specific implementation process of distance measuring method is illustrated with specific example below.

Assuming that transmitting signal is WiFi signal, in automobile, first terminal includes 4 directional aerials, 2 for first terminal setting Omnidirectional antenna, second terminal are mobile phone.Wherein, body of a motor car it is left front, right before, left back, right back is to being separately installed with one A directional aerial is separately installed with an omnidirectional antenna above and below in body of a motor car, and the parameter of 4 directional aerials is completely the same, The parameter of 2 omnidirectional antennas is completely the same.

Fig. 4 is the composed structure schematic diagram of range-measurement system, as shown in figure 4, range-measurement system includes: WiFi antenna subsystem (not shown), control processing subsystem 41, mobile phone terminal system 42, car-mounted display subsystem 43.Wherein, WiFi antenna subsystem For passing through directional aerial and omnidirectional antenna radiation-emitting signal and reception reflection signal；Processing subsystem 41 is controlled to be used for hair It penetrates signal to be modulated and demodulate reflection signal, and sends and transmit signals to mobile phone after demodulation process, be also used to connect Receive the between the first distance between the barrier and corresponding directional aerial that mobile phone is sent and barrier and correspondence omnidirectional antenna At least one of two distances are simultaneously shown；Mobile phone terminal system 42 determines that barrier is determined with corresponding for reflection signal based on the received To the first distance of antenna and the second distance of barrier and corresponding omnidirectional antenna, and first distance and second distance are sent to vapour Car-mounted display subsystem 43 on vehicle；Car-mounted display subsystem 43 is for showing first distance and second distance, when automobile and the When one distance or more and more closer second distance, car-mounted display subsystem 43 issues frequency by buzzer or loudspeaker and is getting faster Sound, or every the set time issue speech form safety instruction message.

Each component part is described in detail below, specific as follows:

(1) WiFi antenna subsystem

WiFi antenna subsystem regularly sends certain frequency to motor vehicle environment by directional aerial or omnidirectional antenna WiFi signal, and real-time monitoring receives the signal in current environment.

Fig. 5 is the signal radiation schematic diagram of directional aerial, as shown in figure 5, directional aerial is in the horizontal direction and vertical process It is radiated.Directional aerial has biggish forward gain, can effectively enhance signal strength, increases anti-interference ability.Pass through vehicle The directional aerial in four orientation of body can cover the signal radiation of vehicle body both horizontally and vertically substantially.And orientation day can be passed through Line is detected apart from the farther away barrier of vehicle body, this distance range is generally 1000 meters or so.

Fig. 6 is the signal radiation schematic diagram of omnidirectional antenna, as shown in fig. 6, omnidirectional antenna homogeneous radiation in the horizontal direction.It is logical The omnidirectional antenna for crossing the two sides above and below vehicle body may detect apart from the closer barrier of vehicle body, this distance range is generally 10 Rice or so.

WiFi signal belongs to electromagnetic wave signal, at present there are mainly two types of the frequency f of WiFi signal: 2.4GHz and 5.0GHz. The aerial spread speed v of electromagnetic wave is 3 × 10^8m/s of the light velocity, then when WiFi signal frequency is 2.4GHz, wavelengthWhen WiFi signal frequency is 5GHz, wavelength

The frequency of the WiFi signal of the directional antenna radiation in four orientation of vehicle body may be the same or different, still The frequency of WiFi signal must match with the working frequency of directional aerial.

The identical WiFi signal of frequency is met in air, when they encounter same barrier in air, works as wavelength Much larger than barrier size when, it may appear that apparent diffraction phenomena.

Fig. 7 a is the schematic diagram for emitting signal and encountering barrier there is no diffraction phenomena, and Fig. 7 b is that transmitting signal encounters barrier Hinder object that the schematic diagram of diffraction phenomena occurs.When body of a motor car it is left front, right before two directional antenna radiations installing respectively , if the frequency of two WiFi signals is different, apparent diffraction phenomena will not occur for WiFi signal, such as when encountering barrier Shown in Fig. 7 a figure.If the frequency of two WIFI signals is identical, it is bound to that apparent diffraction phenomena occurs, as Fig. 7 b schemes institute Show.In addition to diffraction phenomena, the WiFi signal of directional antenna radiation reflects at barrier, and WiFi antenna subsystem receives anti- The reflection signal being emitted back towards, and according to transmitting signal and reflect the phase difference of signal, calculate barrier and corresponding directional aerial away from From.

Assuming that the frequency of transmitting signal is f, emit the angular frequency w=2 π f of signal, emits signal and first and reflect signal Phase difference isEmit signal the sendings time and first reflect signal receiving time between time difference beTransmitting The spread speed of signal and the first reflection signal in propagation mediumIn this way, between barrier and corresponding directional aerial First distanceWherein, c is electromagnetic wave rate, and n is the medium for propagating current demand signal Refractive index.

(2) processing subsystem is controlled

Processing subsystem 41 is controlled mainly by the digital signal processors such as filter, modulator (DSP, Digital Signal Processor) device composition, by using frequency hopping, improves the anti-interference ability and stability of system.

Fig. 8 be control processing subsystem schematic diagram, as shown in figure 8, control processing subsystem 41 mainly by modulator, Demodulator, frequency mixer, filter etc. complete the transmitting-receiving and processing of signal, and each antenna is corresponding with a set of processing equipment.Tool Body, modulation and anti-interference process to transmitting signal are realized by modulator, frequency mixer, filter, and will be filtered The transmitting signal arrived passes through respective antenna to external radiation；Reflection signal is received by respective antenna, and passes through frequency mixer, filtering Device, demodulator carry out demodulation anti-interference process to reflection signal, and the transmitting signal that demodulation is obtained is carried out as signal is issued It issues.Wherein, frequency mixer is using frequency hopping, frequency hopping be transmitted by receiving-transmitting sides the carrier frequency of signal according to Predetermined rule carries out the communication mode of Discrete Change, has good anti-interference ability, even if there is part frequency point disturbed, remains to It is normally communicated on the frequency point that other are not disturbed.

Control processing subsystem 41 is also used to reflect first after demodulation process signal or the second reflection signal is sent To mobile phone terminal system 42.

(3) mobile phone terminal system

On the one hand, mobile phone terminal system 42 be responsible for based on the received from body of a motor car it is left front, it is right before, it is left back, right after, The reflection signal of upper and lower direction, and the transmitting signal issued determine the first distance between barrier and corresponding directional aerial, And the second distance between barrier and corresponding omnidirectional antenna is determined according to the transmitting signal of sending, simulate vehicle body surrounding obstacles The distribution situation of object；On the other hand, mobile phone terminal system 42 is connected with car-mounted display subsystem 43, by determine first away from From (when practical application, not every antenna can detect barrier, so 42 basis of mobile phone terminal system with second distance The result of detection is come the corresponding first distance of antenna and/or second distance that determine barrier) it is sent to car-mounted display subsystem System 43, and real-time display is on the middle control display screen of car-mounted display subsystem 43.Mobile phone terminal system 42 is also used to according to First distance and second distance prompt user to adjust the moving direction of automobile.

For example, when driver prepare reversing back when, mobile phone terminal system 42 compare vehicle body with it is left front, right before, it is left back, right The distance of the barrier of rear direction prompts user to be slightly biased to right side reversing if the obstacle distance vehicle body of left back is partially close Adjustment, it is ensured that vehicle body approaches at a distance from left back and right back barrier.When detecting vehicle body and left back, right back to obstacle When the distance of object is respectively less than safe distance, user is prompted to stop reversing.

Mobile phone terminal system 42 in real time for user provide vehicle body it is left front, it is right before, it is left back, right after, upper and lower upwards and obstacle The distance between with barrier on the distance between object and relative position and vehicle body direction, and user is supplied to for next The driving of step prompts；The middle draining crystal display screen of mobile phone terminal system 42 and car-mounted display subsystem 43 establishes connection simultaneously, will Barrier is shown at a distance from vehicle body with relative position, and user is facilitated more intuitively to observe when front of the car peripheral obstacle Location status.

(4) car-mounted display subsystem

Car-mounted display subsystem 43 is responsible for receiving the processing result of mobile phone terminal system 42, in car-mounted display subsystem 43 Real-time display comes out on middle draining crystal display screen.It, can according to barrier and the first distance of corresponding directional aerial and relative position To be particularly shown out barrier in the specific location of vehicle body surrounding；It, can according to the second distance of barrier and corresponding omnidirectional antenna To be particularly shown out overlay area of the barrier near vehicle body, the overlay area is to cover by the circle of radius of second distance Cover area.

Here, mobile phone terminal system 42 and car-mounted display subsystem 43 need first to establish connection, and connection type includes but not It is limited to Miracast, AirPlay, MHL/HDMI, USB Link.

Embodiment three

Method to realize embodiment one, present embodiments provides a kind of first terminal, as shown in figure 9, described first is whole End includes at least one directional aerial, and the first terminal includes: to obtain module 91, the first modulation module 92, first reception mould Block 93, the first demodulation module 94；Wherein,

Module 91 is obtained, for obtaining transmitting signal；

First modulation module 92, the transmitting signal for will acquire is modulated processing, and at least one is fixed described in It is radiated to antenna, wherein the frequency of the transmitting signal matches with the working frequency of corresponding directional aerial；

First receiving module 93, for receiving the first reflection signal by least one described directional aerial, described first Reflection signal is that the transmitting signal of at least one directional antenna radiation encounters the signal that barrier back reflection returns；

Received first reflection signal is carried out demodulation process for being directed to each directional aerial by the first demodulation module 94, And the first reflection signal issues by treated；The the first reflection signal issued is for determining the barrier and corresponding orientation day The distance between line.

Directional aerial refers to be emitted or to receive electromagnetic wave especially strong on some or certain several specific directions, and at other Direction on emit and receive electromagnetic wave be then zero or a kind of minimum antenna.The parameter of directional aerial includes: working frequency, water Flat lobe width, pitching lobe width, horizontal radiation angle, vertical radiation angle.

The acquisition module 91, the transmitting signal sent specifically for receiving second terminal；Alternatively, receiving second terminal hair The first information sent generates the transmitting signal according to the first information.

Wherein, when practical application, first terminal can be with the transmitting signal or first of periodic receipt second terminal transmission Information；Alternatively, second terminal can also be sent instructions to by user, second terminal responds described instruction operation, and eventually to first End sends transmitting signal or the first information.

Wherein, since the first information is for generating transmitting signal, so the first information can specifically include for generating hair Penetrate the amplitude, frequency, phase parameter etc. of signal.

Here, the first terminal is additionally provided at least one omnidirectional antenna, the first terminal further include:

Omnidirectional antenna, which refers to, shows as 360 degree of all homogeneous radiations on figure in the horizontal direction, that is to say, that non-directional.Omnidirectional The parameter of antenna includes: working frequency, horizontal lobe width, pitching lobe width, horizontal radiation angle.

Here, the first terminal further include:

Frequency hopping modulation module successively carries out frequency hopping modulation, filtering processing for that will emit signal；By the hair after filtering processing Signal is penetrated to be radiated.

Frequency hopping demodulation module successively carries out frequency hopping demodulation, filtering processing for that will reflect signal；It will be anti-after filtering processing It penetrates signal and carries out demodulation process.

Here, the first terminal further include:

Display module, the distance between barrier and corresponding directional aerial for receiving second terminal transmission and barrier At least one of the distance between corresponding omnidirectional antenna is simultaneously shown.

That is, display module, the distance between barrier and respective antenna for receiving second terminal transmission are simultaneously It is shown.

Specifically, according to barrier and the first distance of corresponding directional aerial and relative position, it can be particularly shown out and hinder Hinder object in the specific location of vehicle body surrounding；According to the second distance of barrier and corresponding omnidirectional antenna, it can be particularly shown out and hinder Hinder overlay area of the object near vehicle body, the overlay area is using second distance as the circular coverage area of radius.

In practical applications, the first receiving module 93, the second receiving module are connect by the antenna on first terminal in conjunction with communication Cause for gossip is existing；Obtain module 91, display module is realized by the communication interface being located on first terminal；First modulation module 92, first Demodulation module 94, the second modulation module, the second demodulation module, frequency hopping modulation module, frequency hopping demodulation module, can by be located at first eventually Central processing unit (CPU, Central Processing Unit), microprocessor (MPU, Micro Processor on end Unit), DSP or field programmable gate array (FPGA, Field Programmable Gate Array) etc. are realized；First solution Mode transfer block 94, the second demodulation module are realized by CPU, MPU, DSP, FPGA the combination communication interface being located on first terminal.

Example IV

Method to realize embodiment two, present embodiments provides a kind of second terminal, and as shown in Figure 10, described second eventually End includes: third receiving module 101, the first determining module 102；Wherein,

Third receiving module 101, for receiving the first reflection signal of first terminal transmission；The first reflection signal table The transmitting signal for levying at least one directional antenna radiation encounters the signal that barrier back reflection returns；

First determining module 102, for reflecting signal using described first, and it is corresponding in conjunction with the first reflection signal Emit signal, determines the distance between barrier and corresponding directional aerial；Frequency and the corresponding directional aerial of the transmitting signal Working frequency match.

First determining module 102, specifically for according to the phase parameter of transmitting signal and the phase of the first reflection signal Position parameter, determines the phase difference of transmitting signal and the first reflection signal, determines barrier and corresponding orientation according to the phase difference The distance between antenna.

More specifically, the first determining module 102 is according to the first of phase parameter and the first terminal transmission for emitting signal The phase parameter of signal is reflected, the phase difference of transmitting signal and the first reflection signal is calculated；Then, emitted according to phase difference calculating Receiving time (102 meeting of the first determining module when receiving the first reflection signal of the sending time of signal and the first reflection signal Record corresponding receiving time) between time difference；Finally, using the time difference, further according to transmitting signal and the first reflection signal Spread speed in propagation medium calculates the distance between barrier and corresponding directional aerial.

Here, the second terminal further include:

Generation module is sent for generating the transmitting signal, and to the first terminal；Alternatively, the first information is generated, And sent to the first terminal, the first information generates the transmitting signal for first terminal.

Here, the second terminal further include:

Second determining module, when specifically for reflecting the reception of signal according to the sending time of transmitting signal and second Between, it determines the time difference of sending time and receiving time, is determined between barrier and corresponding omnidirectional antenna according to the time difference Distance.

More specifically, record is sent after the second determining module sends transmitting signal or the first information to first terminal Time, according to receiving time (the second determining module meeting when receiving the second reflection signal of sending time and the second reflection signal Record corresponding receiving time), calculate the time difference between sending time and receiving time；Then, further according to transmitting signal With spread speed of the second reflection signal in propagation medium, the distance between barrier and corresponding omnidirectional antenna are calculated.

Here, the second terminal further include:

Sending module, for by the distance between the barrier and corresponding directional aerial and the barrier with correspondence entirely First terminal is sent to at least one of the distance between antenna.

In practical applications, third receiving module 101, the 4th receiving module, sending module are by being located in second terminal Communication interface is realized；First determining module 102, the second determining module, generation module by be located at second terminal on CPU, MPU, DSP, FPGA etc. are realized；Generation module can be realized by CPU, MPU, DSP, FPGA the combination communication interface being located in second terminal.

It should be understood by those skilled in the art that, the embodiment of the present invention can provide as method, system or computer program Product.Therefore, the shape of hardware embodiment, software implementation or embodiment combining software and hardware aspects can be used in the present invention Formula.Moreover, the present invention, which can be used, can use storage in the computer that one or more wherein includes computer usable program code The form for the computer program product implemented on medium (including but not limited to magnetic disk storage and optical memory etc.).

The present invention be referring to according to the method for the embodiment of the present invention, the process of equipment (system) and computer program product Figure and/or block diagram describe.It should be understood that every one stream in flowchart and/or the block diagram can be realized by computer program instructions The combination of process and/or box in journey and/or box and flowchart and/or the block diagram.It can provide these computer programs Instruct the processor of general purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices to produce A raw machine, so that being generated by the instruction that computer or the processor of other programmable data processing devices execute for real The device for the function of being specified in present one or more flows of the flowchart and/or one or more blocks of the block diagram.

These computer program instructions, which may also be stored in, is able to guide computer or other programmable data processing devices with spy Determine in the computer-readable memory that mode works, so that it includes referring to that instruction stored in the computer readable memory, which generates, Enable the manufacture of device, the command device realize in one box of one or more flows of the flowchart and/or block diagram or The function of being specified in multiple boxes.

These computer program instructions also can be loaded onto a computer or other programmable data processing device, so that counting Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, thus in computer or The instruction executed on other programmable devices is provided for realizing in one or more flows of the flowchart and/or block diagram one The step of function of being specified in a box or multiple boxes.

Based on this, the embodiment of the invention also provides a kind of computer storage medium, the computer storage medium includes One group of instruction causes at least one processor to execute the distance measuring method of above-mentioned first terminal side when executed, or Execute the distance measuring method of above-mentioned second terminal side.

The foregoing is only a preferred embodiment of the present invention, is not intended to limit the scope of the present invention.

Claims

1. a kind of distance measuring method, which is characterized in that be applied to first terminal, the first terminal includes at least one orientation day Line；The described method includes:

Obtain transmitting signal；

The transmitting signal that will acquire is modulated processing, and is radiated by least one described directional aerial, wherein described The frequency of transmitting signal matches with the working frequency of corresponding directional aerial；

The first reflection signal is received by least one described directional aerial, and the first reflection signal is that described at least one is fixed The signal that barrier back reflection returns is encountered to the transmitting signal of aerial radiation；

For each directional aerial, received first reflection signal is subjected to demodulation process, and the first reflection is believed by treated Number issue；The the first reflection signal issued is for determining the distance between the barrier and corresponding directional aerial.

2. the method according to claim 1, wherein the acquisition emits signal, comprising:

Receive the transmitting signal that second terminal is sent；Alternatively,

3. the method according to claim 1, wherein the first terminal further includes at least one omnidirectional antenna；

The second reflection signal is received by least one described omnidirectional antenna, and the second reflection signal is that described at least one is complete The signal that barrier back reflection returns is encountered to the transmitting signal of aerial radiation；

For each omnidirectional antenna, received second reflection signal is subjected to demodulation process, and the second reflection is believed by treated Number issue；The the second reflection signal issued is for determining the distance between barrier and corresponding omnidirectional antenna；Wherein, the omnidirectional Antenna can receive the second reflection signal within the scope of first distance；The directional aerial can be inscribed in second distance range Receive the first reflection signal；The first distance is less than the second distance.

4. method according to any one of claims 1 to 3, which is characterized in that after being modulated, radiation-emitting signal it Before, the method also includes:

Correspondingly, before being demodulated, the method also includes:

Reflection signal is successively subjected to frequency hopping demodulation, filtering processing；Reflection signal after filtering processing is subjected to demodulation process.

5. method according to any one of claims 1 to 3, which is characterized in that the method also includes:

6. a kind of distance measuring method, which is characterized in that be applied to second terminal, which comprises

Receive the first reflection signal that first terminal is sent；First reflection at least one directional antenna radiation of characterization Transmitting signal encounters the signal that barrier back reflection returns；

Using the first reflection signal, and in conjunction with the corresponding transmitting signal of the first reflection signal, determine barrier with it is right Answer the distance between directional aerial；The frequency of the transmitting signal matches with the working frequency of corresponding directional aerial.

7. according to the method described in claim 6, it is characterized in that, it is described receive first terminal send first reflection signal it Before, the method also includes:

The first information is generated, and is sent to the first terminal, the first information generates the transmitting letter for first terminal Number.

8. according to the method described in claim 6, it is characterized in that, the method also includes:

Receive the second reflection signal that first terminal is sent；At least one omnidirectional antenna spoke described in the second reflection characterization The transmitting signal penetrated encounters the signal that barrier back reflection returns；

Using the second reflection signal, and in conjunction with the corresponding transmitting signal of the second reflection signal, determine barrier with it is right Answer the distance between omnidirectional antenna.

9. according to the described in any item methods of claim 6 to 8, which is characterized in that it is described using the first reflection signal, and In conjunction with the corresponding transmitting signal of the first reflection signal, the distance between barrier and corresponding directional aerial are determined, comprising:

According to the phase parameter of the phase parameter of transmitting signal and the first reflection signal, transmitting signal and the first reflection signal are determined Phase difference, the distance between barrier and corresponding directional aerial are determined according to the phase difference.

10. according to the method described in claim 8, it is characterized in that, described using the second reflection signal, and in conjunction with described The corresponding transmitting signal of second reflection signal, determines the distance between barrier and corresponding omnidirectional antenna, comprising:

According to the receiving time of the sending time of transmitting signal and the second reflection signal, determine sending time and receiving time when Between it is poor, the distance between barrier and corresponding omnidirectional antenna are determined according to the time difference.

11. according to the described in any item methods of claim 6 to 8, which is characterized in that the method also includes:

12. a kind of first terminal, which is characterized in that the first terminal includes at least one directional aerial, the first terminal Include:

Module is obtained, for obtaining transmitting signal；

First modulation module, the transmitting signal for will acquire is modulated processing, and passes through at least one described directional aerial It is radiated, wherein the frequency of the transmitting signal matches with the working frequency of corresponding directional aerial；

First receiving module, for receiving the first reflection signal, the first reflection letter by least one described directional aerial The signal of barrier back reflection time number is encountered for the transmitting signal of at least one directional antenna radiation；

Received first reflection signal is carried out demodulation process, and will place for being directed to each directional aerial by the first demodulation module The first reflection signal after reason issues；The the first reflection signal issued is for determining between the barrier and corresponding directional aerial Distance.

13. first terminal according to claim 12, which is characterized in that it is complete that the first terminal is additionally provided at least one To antenna, the first terminal further include:

Second modulation module, for radiating the transmitting signal after modulation treatment by least one described omnidirectional antenna；

Second receiving module, for receiving the second reflection signal, the second reflection letter by least one described omnidirectional antenna The signal of barrier back reflection time number is encountered for the transmitting signal of at least one omnidirectional antenna radiation；

Received second reflection signal is carried out demodulation process, and will place for being directed to each omnidirectional antenna by the second demodulation module The second reflection signal after reason issues；Issue second reflection signal be used for determine between barrier and corresponding omnidirectional antenna away from From；Wherein, the omnidirectional antenna can receive the second reflection signal within the scope of first distance；The directional aerial can be The first reflection signal is received within the scope of second distance；The first distance is less than the second distance.

14. a kind of second terminal, which is characterized in that the second terminal includes:

Third receiving module, for receiving the first reflection signal of first terminal transmission；The first reflection characterization is at least The transmitting signal of one directional antenna radiation encounters the signal that barrier back reflection returns；

First determining module, for believing using the first reflection signal, and in conjunction with the corresponding transmitting of the first reflection signal Number, determine the distance between barrier and corresponding directional aerial；Frequency and the work of corresponding directional aerial of the transmitting signal Frequency matches.

15. second terminal according to claim 14, which is characterized in that the second terminal further include:

4th receiving module, for receiving the second reflection signal of first terminal transmission；Described in the second reflection characterization The transmitting signal of at least one omnidirectional antenna radiation encounters the signal that barrier back reflection returns；

Second determining module, for believing using the second reflection signal, and in conjunction with the corresponding transmitting of the second reflection signal Number, determine the distance between barrier and corresponding omnidirectional antenna.

16. a kind of computer readable storage medium, is stored thereon with computer program, which is characterized in that the computer program quilt The step of any one of claim 1 to 11 the method is realized when processor executes.