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Method and device for acquiring multiple targets in vehicle-mounted millimeter-wave radar system

A millimeter-wave radar and acquisition method technology, applied in the field of vehicle radar, can solve the problems of missed target detection and inaccurate target detection, and achieve the effects of high real-time performance, reduced false alarm probability, and reduced dimensionality

Active Publication Date: 2019-01-04
DALIAN ROILAND SCI & TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In order to solve the problems of inaccurate target detection and missed detection of targets in the vehicle-mounted millimeter-wave radar multi-target detection in the prior art, the solution of the present invention is proposed, which makes the detection of multiple targets more accurate and real-time. Engineering realization and application have good value

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  • Method and device for acquiring multiple targets in vehicle-mounted millimeter-wave radar system

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Embodiment 1

[0057] Embodiment 1: a multi-target detection method for a vehicle-mounted millimeter-wave radar system, comprising the following steps:

[0058] 1. Transmit periodic combined waveforms of FMCW and CW; the first cycle transmits FMCW waveforms, the second cycle transmits FMCW waveforms different from the first cycle, and the third cycle transmits CW waveforms;

[0059] 2. Receive the echo signal, and perform fast Fourier transform (FFT transform) on the received echo signal;

[0060] Because after the FFT changes, there will be multiple similar values ​​through the constant false alarm detection, which increases the amount of calculation and the false alarm rate. Therefore, in order to obtain a more accurate speed value for CW and reduce the search for similar speeds in the FMCW speed matrix, before speed pairing,

[0061] 3. Use the frequency clustering algorithm to obtain the Doppler frequency matrix of the CW waveform echo signal. Through the velocity formula, the Doppler f...

Embodiment 2

[0063] Embodiment 2: has the same technical solution as embodiment 1, more specifically: because the speed and distance matrix obtained by FMCW contain the values ​​of the real target and the false target. Therefore, the following steps are required afterward, including:

[0064] 5. According to the speed matching algorithm, perform speed matching between the speed matrix obtained by CW and the speed matrix obtained by the first cycle FMCW and the second cycle FMCW, and record the ranks and columns of the speed matrix respectively.

[0065] 6. According to the row and column positions obtained in the velocity matrix, the values ​​on the corresponding rows and columns in the distance matrix are respectively used as the distance values ​​of the corresponding targets.

Embodiment 3

[0066] Embodiment 3: have the same technical scheme as embodiment 1 or 2, more specifically: in order to further accurately obtain the number of multiple targets, and corresponding speed value and distance value, obtain distance and distance for two FMCW cycles. The speed value, establishes a fault tolerance function of distance and speed, and further determines the speed value and distance value as the final target.

[0067] Embodiment 4: the multi-target detection method of the vehicle-mounted millimeter-wave radar system has the same technical scheme as any of the embodiments 1-3, and more specifically, the frequency cohesion algorithm is carried out to the frequency value that has been detected for the first time over the threshold, and the frequency The agglomeration algorithm is as follows:

[0068] 1. Establish a set of frequencies that have passed the threshold, and set up frequencies with similar frequency values ​​to establish a related frequency set A, where the num...

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Abstract

The invention relates to a method and a device for acquiring number of multiple targets of a vehicle-mounted millimeter wave radar system. The method and the device belong to the field of vehicle-mounted radars, and are used for solving the problems of inaccurate target detection and missing detection of targets in vehicle-mounted millimeter wave radar multi-target detection. The technical key point of the method comprises the steps of: transmitting periodic FMCW and CW combined waveforms; receiving echo signals, and performing fast Fourier transform on the received echo signals; adopting a frequency clustering algorithm, solving a Doppler frequency matrix of the CW-waveform echo signals, and calculating a relative velocity matrix; and adopting a frequency agglomeration algorithm in FMCW up-down frequency sweeping, acquiring frequency values of up-down frequency sweeping, and calculating a velocity matrix and a distance matrix of targets. The method and the device have the effect that target detection in vehicle-mounted millimeter wave radar multi-target detection is more accurate.

Description

technical field [0001] The invention belongs to the field of vehicle-mounted radar, and in particular relates to a method and device for acquiring the number of multiple targets in a vehicle-mounted millimeter-wave radar system. Background technique [0002] With the continuous development of intelligent transportation system research, more and more radar sensors are needed in the fields of automotive cruise control and anti-collision radar control. Radar sensors will definitely play a more important role in vehicle safety and comfortable driving. Compared with the general radar, the linear frequency modulated continuous wave (LFMCW) radar has a large time-band product, so it has a high speed resolution and range resolution in theory. In addition, it has the advantages of simple structure, small size and light weight. , especially suitable for radar imaging, target feature research and other fields. However, when the LFMCW radar detects moving targets, the distance-velocity ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S7/41
CPCG01S7/41
Inventor 田雨农王鑫照周秀田史文虎
Owner DALIAN ROILAND SCI & TECH CO LTD
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