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Multi-target frequency matching method for vehicle collision avoidance radar based on combined waveform of lfm triangular wave and constant frequency wave

A technology of anti-collision radar and combined waveforms, which is applied in the direction of radio wave reflection/re-radiation, radio wave measurement system, and utilization of re-radiation, etc., to achieve the effect of eliminating constant false alarm and better matching accuracy

Active Publication Date: 2018-03-06
DALIAN ROILAND SCI & TECH CO LTD
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  • Claims
  • Application Information

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Problems solved by technology

[0004] The invention provides a vehicle collision avoidance radar multi-target frequency matching method based on the combined waveform of LFM triangular wave and constant frequency wave, aiming at solving the technical problem of multi-target frequency matching and removing false alarms

Method used

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  • Multi-target frequency matching method for vehicle collision avoidance radar based on combined waveform of lfm triangular wave and constant frequency wave

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Embodiment 1: a kind of vehicle collision avoidance radar multi-target frequency matching method based on LFM triangular wave and constant frequency wave combined waveform, is characterized in that, comprises the following steps:

[0018] S1. Threshold detection is performed on the upper and lower sweep bands of the triangular wave and the constant frequency wave respectively. After the detection, the number of threshold points of the constant frequency wave is p, and the corresponding Doppler frequency is f respectively. c1 ,f c2 ... f cp , the number of threshold points for frequency sweep on the triangular wave is m, and the corresponding difference frequencies are f up1 ,f up2 ... f upm , the number of cross-threshold points for the down-sweep is n, and the corresponding difference frequencies are f down1 ,f down2 ... f downn ;

[0019] S2. Set the p value as the minimum value of m and n;

[0020] S3. Combine the difference frequencies of the upper and lower...

Embodiment 2

[0028] The difference from Embodiment 1 is that: among the distance and speed information pairs of p targets, each target whose distance is less than or equal to the range resolution is considered as the same target, and finally obtains the real number of targets.

Embodiment 3

[0030]

[0031] The table is a kind of data obtained by using the method of Embodiment 1 according to the target true value and measured value. In the table, the output results and accuracy of the target's true value measurement value are the distance and speed of the target obtained by the radar multi-target detection, R is the distance, and v is the speed, which is the final difference frequency obtained through the upper and lower frequency sweep calculations above. calculated.

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Abstract

A vehicle collision avoidance radar multi-target frequency matching method based on a combined waveform of an LFM triangular wave and a constant frequency wave belongs to the field of vehicle collision avoidance radar multi-target frequency matching, solves the technical problem of multi-target frequency matching, and eliminates constant false alarms. According to the technical scheme, over-threshold detection is carried out on upper and lower frequency sweep segments of the triangular wave and the constant frequency wave separately; beat frequencies of the upper and lower frequency sweep segments of the triangular wave are combined pair-wise and two matrices (A1 and B1) are generated; a difference matrix C1 of the matrix A1 and a first Doppler frequency value detected from the constant frequency wave is calculated, and the minimal value of the matrix C1 is found; and corresponding Doppler frequency values and beat frequencies and values in the matrix A1 and the matrix B1 are output. The beneficial effects are that the technical problem of multi-target frequency matching is solved and false alarms are removed.

Description

technical field [0001] The invention belongs to the field of multi-target frequency matching of vehicle anti-collision radar, and relates to a multi-target frequency matching method of vehicle anti-collision radar based on the combined waveform of LFM triangular wave and constant frequency wave. Background technique [0002] Automobile anti-collision radar is a vehicle active safety product, which has the function of collision warning and has been actually applied to some vehicles. Vehicle collision avoidance radar can complete the detection and judgment of a single target very well, but its detection and judgment results for multiple targets are not ideal, and false alarms and missed detections often occur. [0003] LFM (Linear Frequency Modulation), is a frequency modulation technique. The vehicle collision avoidance radar needs to output the distance and relative speed information of the target in front of the vehicle more accurately. According to its functional characte...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/93
CPCG01S13/931
Inventor 田雨农刘达周秀田史文虎
Owner DALIAN ROILAND SCI & TECH CO LTD
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