CN103472451A - Measurement method for automobile crashproof radar - Google Patents
Measurement method for automobile crashproof radar Download PDFInfo
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- CN103472451A CN103472451A CN2013103372730A CN201310337273A CN103472451A CN 103472451 A CN103472451 A CN 103472451A CN 2013103372730 A CN2013103372730 A CN 2013103372730A CN 201310337273 A CN201310337273 A CN 201310337273A CN 103472451 A CN103472451 A CN 103472451A
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Abstract
Disclosed is a measurement method for an automobile crashproof radar. The method includes: firstly using 10MHz reference signals to generate a 1GHz single-point phase-lock source and at the same time to generate a 22GHz single-point phase-lock source; 100MHz-300MHz linear signals, which are generated by a DDS, generating 1.1GHz -1.3GHz linear signals after frequency mixing with 1GHz signals and generating 23.1GHz-23.3GHz linear signals with a 22GHz single-point phase-lock source up-converter; and a 23.1GHz-23.3GHz linear-signal up-converter generating 24.13GHz-24.33GHz linear binary-phase coded signals, which are then transmitted by a transmission antenna. The method adopts the DDS and an up-converter technology as the basis to generate needed linear frequency modulation and coded signals so that measurement range is increased.
Description
Technical field:
The present invention relates to the car radar technical field, be specifically related to the measuring method of automobile collision avoidance radar.
Background technology:
In recent years, along with economic fast development, automobile is being just that increasing crowd uses as the vehicles, and the automobile density on road is more and more higher, and thing followed problem is apparent.Along with the quick increase of automobile quantity, frequent accidents occurs, and the life and property loss number caused thus is surprising.According to statistics, the number that the whole world is killed in an automobile accident is also more than the death toll of World War II.Statistics for the traffic hazard on highway shows: the traffic accident more than 80% is because driver's reaction causes not in time, and the traffic accident more than 65% is due to the collision of knocking into the back.Research shows, if the driver within one second, recognize danger and take appropriate measures in advance, most accidents are avoidable.But radar in the past is anti-interference in range finding, rate accuracy, adapt to all Shortcomings of environment for use aspect, lack Practical significance.
Summary of the invention:
The measuring method that the purpose of this invention is to provide automobile collision avoidance radar, it adopts DDS and up-conversion technology is that basis produces required linear frequency modulation and coded signal, make measuring accuracy and job stability be improved, and receiver adopts the single-conversion technology, avoid near the spuious interference to received signal of direct current.
In order to solve the existing problem of background technology, the present invention is by the following technical solutions: its first measuring method is: at first by the 10MHz reference signal, produce 1GHz single-point phase locked source, as the frequency conversion reference signal, produce the single-point phase locked source of 22GHz simultaneously; Produce the linear FM signal of 100MHz to 300MHz by DDS, produce the linear FM signal of 1.1GHz to 1.3GHz with the mixing of 1GHz signal, then produce the linear FM signal of 23.1GHz to 23.3GHz with 22GHz single-point phase locked source up-conversion, this signal produces the reference signal transmitted with the receiver local oscillation signal as up-conversion; 23.1GHz be the local oscillation signal of 24.1GHz to the 24.3GHz receiver to the linear FM signal of 23.3GHz and the reference signal up-conversion generation frequency of 1GHz; The 30MHz phase-coded signal produced by DDS, with the phase-coded signal of 1GHz reference signal mixing generation 1030MHz, then with the linear FM signal up-conversion generation 24.13GHz to 24 of 23.1GHz to 23.3GHz.The linear frequency modulation Coded Signals of 33GHz, by transmission antennas transmit.
Its second measuring method is: by VCO, directly produce the linear FM signal of 23.1GHz to 23.3GHz; Produce the reference signal transmitted with the receiver local oscillation signal as up-conversion; 23.1GHz be 24.1GHz to 24 to the linear FM signal of 23.3GHz and the reference signal up-conversion generation frequency of 1GHz.The local oscillation signal of 3GHz receiver; The 30MHz phase-coded signal produced by DDS, phase-coded signal with 1GHz reference signal mixing generation 1030MHz, then arrive the linear frequency modulation Coded Signals of the linear FM signal up-conversion generation 24.13GHz of 23.3GHz to 24.33GHz with 23.1GHz, by transmission antennas transmit.
Its modulation system adopts the signal form of linear frequency modulation biphase coding system.It is that broad pulse is divided into to several subpulses, carries out phase encoding between subpulse, carries out linear frequency modulation in subpulse, forms to mix to transmit.
Its signal processing method: native system has mainly adopted DSP technology practical function, and 1, adopt logic-based approach to calculate initial flight path, utilize Bo Menfa to carry out Track In Track; 2, having adopted moving-target detection (MTD) disposal route, is the moving target improvement factor, reduces and detects false alarm rate; 3, the target detection for clutter is caused, CFAR remains on a lower acceptable level, has adopted bidimensional CFAR signal detecting method, guarantees the system steady operation.
Principle of work of the present invention: echoed signal is added to through time-multiplexed hilted broadsword two-throw switch by the two-way receiving antenna that height is put, frequency mixer, produce the intermediate-freuqncy signal intermediate-freuqncy signal and deliver to signal processing unit through amplification filtering, by signal processing unit calculate target apart from metrical informations such as orientation and relative velocities, and metrical information is delivered to by serial communication mode to host computer shows and further processing.Signal-processing board comprises five parts, is respectively the A/D acquisition module, programming logic gate array FPGA, digital signal processor and system control processor.The wherein main settling signal impedance transformation of A/D acquisition module and analog-to-digital function.FPGA mainly completes the logic of A/D module, DDS and SDRAM and sequential control, also will complete in addition the formation of fft analysis, related operation and the radar signal of digital filtering, signal.The function of DSP is control and the target following function of completion system.The control sequential of the main completion system of system control processor with the communicating by letter of host computer.
The present invention has following beneficial effect: it adopts DDS and up-conversion technology to produce required linear frequency modulation and coded signal for basis, make measuring accuracy and job stability be improved, and receiver adopts the single-conversion technology, avoid near the spuious interference to received signal of direct current.
Embodiment:
This embodiment is by the following technical solutions: its first measuring method is: at first by the 10MHz reference signal, produce 1GHz single-point phase locked source, as the frequency conversion reference signal, produce the single-point phase locked source of 22GHz simultaneously; Produce the linear FM signal of 100MHz to 300MHz by DDS, produce the linear FM signal of 1.1GHz to 1.3GHz with the mixing of 1GHz signal, then produce the linear FM signal of 23.1GHz to 23.3GHz with 22GHz single-point phase locked source up-conversion, this signal produces the reference signal transmitted with the receiver local oscillation signal as up-conversion; 23.1GHz be the local oscillation signal of 24.1GHz to the 24.3GHz receiver to the linear FM signal of 23.3GHz and the reference signal up-conversion generation frequency of 1GHz; The 30MHz phase-coded signal produced by DDS, with the phase-coded signal of 1GHz reference signal mixing generation 1030MHz, then with the linear FM signal up-conversion generation 24.13GHz to 24 of 23.1GHz to 23.3GHz.The linear frequency modulation Coded Signals of 33GHz, by transmission antennas transmit.
Its second measuring method is: by VCO, directly produce the linear FM signal of 23.1GHz to 23.3GHz; Produce the reference signal transmitted with the receiver local oscillation signal as up-conversion; 23.1GHz be 24.1GHz to 24 to the linear FM signal of 23.3GHz and the reference signal up-conversion generation frequency of 1GHz.The local oscillation signal of 3GHz receiver; The 30MHz phase-coded signal produced by DDS, phase-coded signal with 1GHz reference signal mixing generation 1030MHz, then arrive the linear frequency modulation Coded Signals of the linear FM signal up-conversion generation 24.13GHz of 23.3GHz to 24.33GHz with 23.1GHz, by transmission antennas transmit.
Waveform Design: for anti-collision radar system, enough large scan position angle is essential.Although the increase at scan position angle makes the undesired signal that enters radar receiver increase,, in order to assess all sidedly the potential dangerous situation of vehicle front, collision avoidance radar should have larger scan position angle, to guarantee its functional reliability.When having a plurality of vehicle targets to be present within the visual field of collision avoidance radar, at first radar system must guarantee to determine distance and the relative velocity of each target, each target provided according to the angle measurement function again is with respect to the azimuth information of own car, get rid of the jamming target on adjacent lane, again the target on own car track is selected, the nearest target vehicle of the own car of selected distance is risk object, once the spacing between this target and own car has surpassed default warning distance, to alarm driver.For new signal system in this paper, utilization tries to gather approximate algorithm and detects risk object, can effectively remove false-alarm.
Ranging and range rate: at first linearly modulated signal carries out frequency modulation (PFM) to carrier wave, and the signal after modulation is delivered to 0/ π phase-modulator, another input signal of phase converter is pseudorandom biphase coded signal between arteries and veins, it is the pseudo-random code that produces by the pseudo-random code generator result to the high-frequency impulse modulation, the signal after complex modulated by antenna to external radiation; Echoed signal and fm carrier signal are added to frequency mixer simultaneously, obtain difference frequency signal, after video amplifier, just can obtain being subject to the pseudorandom biphase coded signal of linear FM signal modulation and the product term of Doppler signal; After the CFAR amplifier is processed, relevant to this locality delay pseudorandom phase Code, obtain being subject to the relevant output of comprehensive modulation of Doppler, through doppler filtering, can obtain range information and doppler information about target; Process through signal again, produce enabling signal, trigger topworks.
The principle of work of this embodiment: echoed signal is added to through time-multiplexed hilted broadsword two-throw switch by the two-way receiving antenna that height is put, frequency mixer, produce the intermediate-freuqncy signal intermediate-freuqncy signal and deliver to signal processing unit through amplification filtering, by signal processing unit calculate target apart from metrical informations such as orientation and relative velocities, and metrical information is delivered to by serial communication mode to host computer shows and further processing.Signal-processing board comprises five parts, is respectively the A/D acquisition module, programming logic gate array FPGA, digital signal processor and system control processor.The wherein main settling signal impedance transformation of A/D acquisition module and analog-to-digital function.FPGA mainly completes the logic of A/D module, DDS and SDRAM and sequential control, also will complete in addition the formation of fft analysis, related operation and the radar signal of digital filtering, signal.The function of DSP is control and the target following function of completion system.The control sequential of the main completion system of system control processor with the communicating by letter of host computer.
Frequency Band Selection: China stipulates that the frequency of operation of automobile-used anticollision radar is K wave band and mm wave band at present, concrete frequency K wave band: (24.00～24.25) GHz; Mm wave band: (76～77) GHz.According to the conditions such as weather environment characteristic, antenna size and hardware realization of frequency, determine that the K wave band is this programme working frequency range.
Working system: this programme is chosen a kind of radar signal (PN-coded FMCW) and corresponding signal processing method of New System, when disturbing between the inhibition radar, can calculate fast distance and the speed of a plurality of targets, have advantages of that volume is little, cost is low.
Modulation system: radar signal modulation system commonly used mainly contains width modulation, phase encoding modulation and three kinds of forms of frequency modulation (PFM) at present.This programme adopts the signal form of linear frequency modulation biphase coding system.It is that broad pulse is divided into to several subpulses, carries out phase encoding between subpulse, carries out linear frequency modulation in subpulse, forms to mix to transmit.
Antenna Design: antenna form is selected: for reducing volume, select micro-band plane, receive three antennas for one two, three antenna spacings are from >=30dB
The signal Treatment Design: signal is processed in radar system in very critical positions, particularly software.Native system has mainly adopted DSP technology practical function, and its characteristics are embodied in: 1, adopt logic-based approach to calculate initial flight path, utilize Bo Menfa to carry out Track In Track.2, adopted moving-target detection (MTD) disposal route.For the moving target improvement factor, reduce to detect false alarm rate, 3, the target detection for clutter is caused, CFAR remains on a lower acceptable level, has adopted bidimensional CFAR signal detecting method, guarantees the system steady operation.
This embodiment has following beneficial effect: it adopts DDS and up-conversion technology for basis produces required linear frequency modulation and coded signal, makes frequency stabilization accurate, thereby has improved measuring accuracy.Receiver adopts the single-conversion technology, avoids near the spuious interference to received signal of direct current, has adopted the non-zero if scheme, has guaranteed job stability.Choose a kind of radar signal (PN-coded FMCW) and corresponding signal processing method of New System, can effectively suppress to disturb between radar.Signal has adopted Track In Track, MTD, CFAR technology on processing, and in the practical function target, has guaranteed the system stability reliably working.
Claims (4)
1. the measuring method of automobile collision avoidance radar, is characterized in that its measuring method is: at first by the 10MHz reference signal, produce 1GHz single-point phase locked source, as the frequency conversion reference signal, produce the single-point phase locked source of 22GHz simultaneously; Produce the linear FM signal of 100MHz to 300MHz by DDS, produce the linear FM signal of 1.1GHz to 1.3GHz with the mixing of 1GHz signal, then produce the linear FM signal of 23.1GHz to 23.3GHz with 22GHz single-point phase locked source up-conversion, this signal produces the reference signal transmitted with the receiver local oscillation signal as up-conversion; 23.1GHz be the local oscillation signal of 24.1GHz to the 24.3GHz receiver to the linear FM signal of 23.3GHz and the reference signal up-conversion generation frequency of 1GHz; The 30MHz phase-coded signal produced by DDS, phase-coded signal with 1GHz reference signal mixing generation 1030MHz, then arrive the linear frequency modulation Coded Signals of the linear FM signal up-conversion generation 24.13GHz of 23.3GHz to 24.33GHz with 23.1GHz, by transmission antennas transmit.
2. the measuring method of automobile collision avoidance radar, is characterized in that its measuring method is: by VCO, directly produce the linear FM signal of 23.1GHz to 23.3GHz; Produce the reference signal transmitted with the receiver local oscillation signal as up-conversion; 23.1GHz be the local oscillation signal of 24.1GHz to the 24.3GHz receiver to the linear FM signal of 23.3GHz and the reference signal up-conversion generation frequency of 1GHz; The 30MHz phase-coded signal produced by DDS, phase-coded signal with 1GHz reference signal mixing generation 1030MHz, then arrive the linear frequency modulation Coded Signals of the linear FM signal up-conversion generation 24.13GHz of 23.3GHz to 24.33GHz with 23.1GHz, by transmission antennas transmit.
3. the measuring method of automobile collision avoidance radar, is characterized in that its modulation system adopts the signal form of linear frequency modulation biphase coding system.It is that broad pulse is divided into to several subpulses, carries out phase encoding between subpulse, carries out linear frequency modulation in subpulse, forms to mix to transmit.
4. the measuring method of automobile collision avoidance radar, it is characterized in that its signal processing method: native system has mainly adopted DSP technology practical function, and 1, adopt logic-based approach to calculate initial flight path, utilize Bo Menfa to carry out Track In Track; 2, having adopted moving-target detection (MTD) disposal route, is the moving target improvement factor, reduces and detects false alarm rate; 3, the target detection for clutter is caused, CFAR remains on a lower acceptable level, has adopted bidimensional CFAR signal detecting method, guarantees the system steady operation.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103901073A (en) * | 2014-04-22 | 2014-07-02 | 哈尔滨工业大学 | Phase-shifting frequency modulation-based photo-thermal imaging method |
| CN103914983A (en) * | 2014-04-17 | 2014-07-09 | 西安飞达电子科技有限公司 | Traffic intersection management laser device and realizing method thereof |
| CN109490851A (en) * | 2018-11-27 | 2019-03-19 | 重庆秦嵩科技有限公司 | A kind of anti-interference method based on pseudo noise code between arteries and veins |
| CN109856603A (en) * | 2019-03-26 | 2019-06-07 | 森思泰克河北科技有限公司 | Radar anti-interference method, terminal device and storage medium |
| CN109856600A (en) * | 2019-01-29 | 2019-06-07 | 成都西科微波通讯有限公司 | A kind of borne Millimeter Wave Collision Avoidance Radars anti-disturbance method |
| CN110333488A (en) * | 2019-07-23 | 2019-10-15 | 上海雪狸传感技术有限公司 | A kind of wide angle beam scanning radar sensor of millimeter wave |
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2013
- 2013-07-30 CN CN2013103372730A patent/CN103472451A/en active Pending
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| 侯志等: "复杂探测背景下的LFMCW 雷达动目标二维检测方法", 《西安电子科技大学学报(自然科学版)》 * |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103914983A (en) * | 2014-04-17 | 2014-07-09 | 西安飞达电子科技有限公司 | Traffic intersection management laser device and realizing method thereof |
| CN103901073A (en) * | 2014-04-22 | 2014-07-02 | 哈尔滨工业大学 | Phase-shifting frequency modulation-based photo-thermal imaging method |
| CN109490851A (en) * | 2018-11-27 | 2019-03-19 | 重庆秦嵩科技有限公司 | A kind of anti-interference method based on pseudo noise code between arteries and veins |
| CN109490851B (en) * | 2018-11-27 | 2021-05-28 | 重庆秦嵩科技有限公司 | Anti-interference method based on inter-pulse pseudo-random code |
| CN109856600A (en) * | 2019-01-29 | 2019-06-07 | 成都西科微波通讯有限公司 | A kind of borne Millimeter Wave Collision Avoidance Radars anti-disturbance method |
| CN109856603A (en) * | 2019-03-26 | 2019-06-07 | 森思泰克河北科技有限公司 | Radar anti-interference method, terminal device and storage medium |
| CN110333488A (en) * | 2019-07-23 | 2019-10-15 | 上海雪狸传感技术有限公司 | A kind of wide angle beam scanning radar sensor of millimeter wave |
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Application publication date: 20131225 |