CN110133634A - A kind of MIMO radar virtual aperture angle-measuring method based on frequency multiplexing technique - Google Patents
A kind of MIMO radar virtual aperture angle-measuring method based on frequency multiplexing technique Download PDFInfo
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- CN110133634A CN110133634A CN201910378882.8A CN201910378882A CN110133634A CN 110133634 A CN110133634 A CN 110133634A CN 201910378882 A CN201910378882 A CN 201910378882A CN 110133634 A CN110133634 A CN 110133634A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/02—Systems using reflection of radio waves, e.g. primary radar systems; Analogous systems
- G01S13/06—Systems determining position data of a target
- G01S13/08—Systems for measuring distance only
- G01S13/32—Systems for measuring distance only using transmission of continuous waves, whether amplitude-, frequency-, or phase-modulated, or unmodulated
- G01S13/34—Systems for measuring distance only using transmission of continuous waves, whether amplitude-, frequency-, or phase-modulated, or unmodulated using transmission of continuous, frequency-modulated waves while heterodyning the received signal, or a signal derived therefrom, with a locally-generated signal related to the contemporaneously transmitted signal
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Abstract
A kind of MIMO radar virtual aperture angle-measuring method based on frequency multiplexing technique of the disclosure of the invention, belongs to signal processing technology, and in particular to radar virtual inside diameter measurement direction of arrival technology.The present invention combines frequency multiplexing technique and MIMO radar virtual aperture angle measurement technique, by taking two hairs four receive radar system as an example, radar emission end emits the linear frequency modulation continuous wave signal of different frequency range using two emitting antennas respectively simultaneously, receives two emitting antennas simultaneously by the reflected signal of object using four receiving antennas in radar receiving end.In each receiving antenna, two-way is divided to do beat signal processing using two frequency mixers, beat baseband signal is obtained by low-pass filter LPF, digital signal is obtained by converter again, it eventually enters into digital signal processor DSP and obtains the angle information of target using MIMO radar virtual aperture angle measurement technique, to realize goal of the invention.The effect having includes: at any time in section, and two emitting antennas is all work.Relative to traditional time-division multiplex technology, the transmitting duration of half is saved, emission effciency is improved；Average emitted power is improved simultaneously.
Description
Technical field
The invention belongs to signal processing technologies, and in particular to radar virtual inside diameter measurement direction of arrival technology.
Background technique
77G vehicle-mounted millimeter wave radar is applied to more and more because of the advantage that its wavelength is short, size is small, detection accuracy is high
In driving assistance system.Transmitter generates continuous high frequency persistent wave, and tranmitting frequency changes with linearly, essentially according to saw
The rule variation of tooth form, also referred to as quick ramp mode LFMCW waveform.The echo and transmitted waveform direct conversion of target, because of echo
The reason of time difference between transmitted waveform, linear frequency modulation, the frequency Yu target range, speed and angle of Beat Signal after mixing
It is related, it can use beat signal frequency and ranging and range rate angle measurement carried out to target.
MIMO radar virtual aperture angle measurement technique is to generate wave path-difference using the range difference between receiving antenna, passes through wave-path
The available phase difference of difference, then the phase by obtaining to each receiving antenna carry out Fast Fourier Transform (FFT) and obtain target angle
Information, and receiving antenna more multi-angle resolution ratio is better.Actually due to cost, resource constraint, need using equivalent
MIMO system method.Such as eight receipts radar of a hair can be equivalent to double hairs four and receive radar, introduces and closes between two emitting antennas
Suitable range difference, in this way can be in phase etc. using the echo-signal that four receiving antennas receive two emitting antennas respectively
Imitate out eight receiving antennas.And it realizes the equivalent of double four receipts of hair and needs time-division multiplexing (TDM), i.e. two transmission channels alternatings
Emit signal.
Time-division multiplex technology due within each period only one transmitting antenna working, in this way transmitting mean power
It is not high.Emit the signal of fixed totalframes simultaneously relative to two antennas simultaneously, it needs the transmitting duration doubled, transmitting
It is inefficient.In order to solve this problem, currently proposed a kind of MIMO radar virtual aperture angle measurement based on frequency multiplexing technique
Method.
Summary of the invention
The technical problem to be solved by the present invention is to improve the emission effciency of 77G trailer-mounted radar, and it is average to improve transmitting
Power.
The present invention is to solve above-mentioned technical problem the technical scheme adopted is that a kind of MIMO based on frequency multiplexing technique
Radar virtual aperture angle-measuring method.
Radar is received for conventional vehicle-mounted two hair four of 77G, time division multiplexing and MIMO are generally used in angle measurement technique
Radar angle measurement combines.Two emitting antennas alternate emission signal receives two emitting antennas by four receiving antennas respectively
Echo-signal, then by phase relation it is equivalent go out eight receiving antennas.But because transmitting mean power is not high, and
Only one transmitting antenna is working in each period, and emission effciency is not high.
In order to improve the emission effciency of 77G trailer-mounted radar, and improve transmitting mean power.Virtual based on MIMO angle measurement
Some improvement are carried out to original angle measuring system on the basis of aperture technique, propose a kind of MIMO based on frequency multiplexing technique
Radar virtual aperture angle-measuring method, this method comprises:
Step 1: obtaining linear frequency modulation continuous wave signal using Ramp generator, two-way is divided by 77G voltage controlled oscillator
Signal；All the way then signal is directly launched by power amplifier by transmitting antenna TX1, and another way signal is first believed with local oscillator
Number fbiosIt is multiplied, then is successively then launched by transmitting antenna TX2 by bandpass filter and power amplifier；Two transmittings
Antenna emits signal simultaneously, and the spacing of two emitting antennas is 4 times of 77G signal wavelengths, wherein local oscillation signal fbiosFrequency
Rate range is 1.2GHz-3.6GHz；
Step 2: in receiving end, using 4 receiving antennas RX1, RX2, RX3, RX4, the distance between each receiving antenna is
Half wavelength；The echo-signal that each receiving antenna receives first passes through low noise amplifier (LNA), then two-way is divided to handle, wherein
It is mixed all the way with the first local oscillation signal, another way and the second local oscillation signal, which are mixed to obtain, corresponding obtains Beat Signal；
Step 3: by each rood of step 2 to Beat Signal beat baseband signal is obtained by low-pass filter (LPF), most
The fixed beat baseband signal of eight road phase differences is obtained eventually；
Step 4: the eight tunnel beat baseband signals that step 3 is obtained are converted to number after passing through analog-digital converter ADC respectively
Signal enters back into DSP and is handled to obtain the angle information of target using MIMO radar virtual aperture angle-measuring method.
The design frame chart of angle measuring system is as shown in Figure 1.
The beneficial effects of the present invention are:
Guarantee that transmitting antenna all in each period is work, improves average emitted power indirectly.
When emitting the signal of fixed totalframes, relative to time-division multiplexing (TDM), the transmitting duration of half can be saved,
Improve emission effciency.
Detailed description of the invention
Fig. 1 is the MIMO radar virtual aperture angle measuring system block diagram based on frequency multiplexing technique；
Fig. 2 is the quick ramp mode time-frequency figure that is time-multiplexed；
Fig. 3 is the quick ramp mode time-frequency figure of frequency division multiplexing；
Fig. 4 is DSP process flow diagram；
Fig. 5 is angle measurement result figure.
Specific embodiment
Step 1: assuming that two targets, one in 20 degree of the right front of radar direction, distance is 60m；Another is in radar
40 degree of right front direction, distance be 80m.
Step 2: the left and right cutoff frequency of setting bandpass filter (BPF) is respectively 77.495GHz and 78.005GHz, is led to
Band is 502MHz；The left and right cutoff frequency that 8 low-pass filters (LPF) are arranged is respectively -255MHz and 255MHz, and passband is
502MHz；The sample rate (to single slope) that 8 ADC are arranged is 10.1MHz.
Step 3: generating linear frequency modulation continuous wave signal using Ramp generator, the single ramp time of signal is 50 μ s, band
Width is 500MHz, and one shares 256 slopes.It is then divided into two paths of signals by 77G voltage controlled oscillator, signal is through overpower all the way
Amplifier obtains the radiofrequency signal that frequency band is 76.5GHz to 77GHz, is reconfigured transmitting antenna TX1 and emits signal；Another way signal
Elder generation and fbiosLocal oscillation signal (selects suitable fbiosLocal oscillation signal guarantees that the transmitting signal band of last two emitting antennas does not weigh
Folded, what is selected here is 1G local oscillation signal) it is multiplied, then frequency band is obtained by bandpass filter BPF and power amplifier and is
The radiofrequency signal of 77.5GHz to 78GHz finally configures transmitting antenna TX2 and emits signal.
Step 4: it is logical to be reconfigured the processing of two bars by low noise amplifier for configuration receiving antenna RX1 receives echo-signal
Road.Signal is multiplied to obtain Beat Signal with local oscillation signal 1 by frequency mixer all the way, then obtains beat base band by low-pass filter
Then signal obtains digital signal matrix by ADC and is stored in the buffer area AD；Another way signal is by frequency mixer and local oscillation signal 2
It is multiplied, equally by low-pass filter and ADC, digital signal matrix is then stored in the buffer area AD.It is docked according to same method
Antenna RX2, RX3 and RX4 is received to be operated.
Step 5: the data for being stored in the buffer area AD being passed to DSP and are counted using MIMO radar virtual aperture angle-measuring method
According to processing, DSP process flow is as shown in figure 4, to finally obtain result as shown in Figure 5.
By experimental verification, angle measurement result error is within 0.1 degree, so the MIMO radar based on frequency multiplexing technique is empty
Quasi- aperture angle-measuring method is feasible.
Claims (1)
1. a kind of MIMO radar virtual aperture angle-measuring method based on frequency multiplexing technique, this method comprises:
Step 1: obtaining linear frequency modulation continuous wave signal using Ramp generator, two paths of signals is divided by 77G voltage controlled oscillator；
All the way then signal is directly launched by power amplifier by transmitting antenna TX1, another way signal elder generation and local oscillation signal
fbiosIt is multiplied, then is successively then launched by transmitting antenna TX2 by bandpass filter and power amplifier；Two transmitting days
Line emits signal simultaneously, and the spacing of two emitting antennas is 4 times of 77G signal wavelengths, wherein local oscillation signal fbiosFrequency
Range is 1.2GHz-3.6GHz；
Step 2: in receiving end, using 4 receiving antennas RX1, RX2, RX3, RX4, the distance between each receiving antenna is half
Wavelength；The echo-signal that each receiving antenna receives first passes through low noise amplifier, then two-way is divided to handle, wherein all the way with first
Local oscillation signal mixing, another way and the second local oscillation signal, which are mixed to obtain, corresponding obtains Beat Signal；
Step 3: by each rood of step 2 to Beat Signal beat baseband signal is obtained by low-pass filter (LPF), it is final
The beat baseband signal fixed to eight road phase differences；
Step 4: the eight tunnel beat baseband signals that step 3 is obtained are converted to digital signal after passing through analog-digital converter ADC respectively,
DSP is entered back into be handled to obtain the angle information of target using MIMO radar virtual aperture angle-measuring method.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112230214A (en) * | 2020-09-18 | 2021-01-15 | 电子科技大学 | MIMO radar virtual sparse area array angle measurement method based on block smooth interpolation |
| CN112534299A (en) * | 2020-08-05 | 2021-03-19 | 华为技术有限公司 | Transmitting method and device based on radar signals |
| CN113189592A (en) * | 2021-03-08 | 2021-07-30 | 苏州乐达纳米科技有限公司 | Vehicle-mounted millimeter wave MIMO radar angle measurement method considering amplitude mutual coupling error |
| CN113189577A (en) * | 2021-04-13 | 2021-07-30 | 电子科技大学 | LFMCW vehicle-mounted radar distance and speed measurement method based on rapid slope mode |
| WO2021258292A1 (en) * | 2020-06-23 | 2021-12-30 | 华为技术有限公司 | Signal processing method and device, radar device and storage medium |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102435981A (en) * | 2011-12-06 | 2012-05-02 | 北京理工大学 | 77GHz millimeter wave radar transmit-receive device for automobile collision resistance |
| CN104678372A (en) * | 2015-03-14 | 2015-06-03 | 西安电子科技大学 | Joint estimation method for super-resolution distance value and angle value by using orthogonal frequency division multiplexing radar |
| CN104678395A (en) * | 2015-03-15 | 2015-06-03 | 西安电子科技大学 | MIMO-OFDM radar imaging method based on cyclic prefix |
| DE102016221947A1 (en) * | 2016-11-09 | 2018-05-09 | Robert Bosch Gmbh | Radar sensor for motor vehicles |
| CN108594233A (en) * | 2018-04-24 | 2018-09-28 | 森思泰克河北科技有限公司 | A kind of velocity solution blur method based on MIMO car radars |
-
2019
- 2019-05-08 CN CN201910378882.8A patent/CN110133634B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102435981A (en) * | 2011-12-06 | 2012-05-02 | 北京理工大学 | 77GHz millimeter wave radar transmit-receive device for automobile collision resistance |
| CN104678372A (en) * | 2015-03-14 | 2015-06-03 | 西安电子科技大学 | Joint estimation method for super-resolution distance value and angle value by using orthogonal frequency division multiplexing radar |
| CN104678395A (en) * | 2015-03-15 | 2015-06-03 | 西安电子科技大学 | MIMO-OFDM radar imaging method based on cyclic prefix |
| DE102016221947A1 (en) * | 2016-11-09 | 2018-05-09 | Robert Bosch Gmbh | Radar sensor for motor vehicles |
| CN109923435A (en) * | 2016-11-09 | 2019-06-21 | 罗伯特·博世有限公司 | Radar sensor for motor vehicle |
| CN108594233A (en) * | 2018-04-24 | 2018-09-28 | 森思泰克河北科技有限公司 | A kind of velocity solution blur method based on MIMO car radars |
Non-Patent Citations (7)
| Title |
|---|
| APPEL, S: "MIMO FMCW Reader Concept for Locating Backscatter Transponders", 《TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES》 * |
| PFEFFER, C: "FMCW MIMO Radar System for Frequency-Division Multiple TX-Beamforming", 《IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES》 * |
| YONGJUN LIU: "Range and angle estimation for MIMO-OFDM integrated radar and communication systems", 《2016 CIE INTERNATIONAL CONFERENCE ON RADAR (RADAR)》 * |
| 季晓宇: "高分辨低复杂度DOA估计在多载频MIMO雷达上的应用", 《中国优秀硕士学位论文全文数据库 信息科技辑》 * |
| 汪意焙: "24GHz汽车防撞雷达系统的研究与实现", 《中国优秀硕士学位论文全文数据库 工程科技II辑》 * |
| 邓忆秋: "基于分数傅里叶变换的雷达通信一体化信号设计", 《中国优秀硕士学位论文全文数据库 信息科技辑》 * |
| 陈龙: "W波段正交频分复用信号传输系统的实验研究", 《太赫兹科学与电子信息学报》 * |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021258292A1 (en) * | 2020-06-23 | 2021-12-30 | 华为技术有限公司 | Signal processing method and device, radar device and storage medium |
| CN112534299A (en) * | 2020-08-05 | 2021-03-19 | 华为技术有限公司 | Transmitting method and device based on radar signals |
| CN112534299B (en) * | 2020-08-05 | 2022-03-29 | 华为技术有限公司 | Transmitting method and device based on radar signals |
| CN112230214A (en) * | 2020-09-18 | 2021-01-15 | 电子科技大学 | MIMO radar virtual sparse area array angle measurement method based on block smooth interpolation |
| CN112230214B (en) * | 2020-09-18 | 2023-03-28 | 电子科技大学 | MIMO radar virtual sparse area array angle measurement method based on block smooth interpolation |
| CN113189592A (en) * | 2021-03-08 | 2021-07-30 | 苏州乐达纳米科技有限公司 | Vehicle-mounted millimeter wave MIMO radar angle measurement method considering amplitude mutual coupling error |
| CN113189577A (en) * | 2021-04-13 | 2021-07-30 | 电子科技大学 | LFMCW vehicle-mounted radar distance and speed measurement method based on rapid slope mode |
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