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Frequency modulated continuous wave speed measurement and distance measurement method

A technology of frequency modulation continuous wave and distance measurement method, which is applied in the direction of radio wave measurement system, measurement device, radio wave reflection/reradiation, etc. It can solve the problem of difficult to carry FFT calculation, limited computing power of signal processing unit, difficult speed and distance measurement Accuracy and other issues

Active Publication Date: 2016-07-06
HUAYU AUTOMOTIVE SYST
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AI Technical Summary

Problems solved by technology

However, in actual engineering, due to the limited computing power of the signal processing unit, it is difficult to carry a large number of FFT operations
Therefore, it is difficult to improve the accuracy of speed and distance measurement by increasing the number of FFT points

Method used

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  • Frequency modulated continuous wave speed measurement and distance measurement method
  • Frequency modulated continuous wave speed measurement and distance measurement method
  • Frequency modulated continuous wave speed measurement and distance measurement method

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Embodiment Construction

[0040] Below in conjunction with the drawings, preferred embodiments of the present invention are given and described in detail.

[0041] Such as Figure 2-3 As shown, the present invention, that is, a method for frequency modulation continuous wave speed measurement and distance measurement, comprises the following steps:

[0042] Step S1, transmit a frequency-modulated continuous wave signal whose frequency varies with a combined waveform modulation signal to N targets through the radar, and obtain a corresponding beat signal, wherein the combined waveform modulation signal includes in a cycle T: A period of arrangement is T Ta The first triangular wave of , a period is T Tb The second triangle wave and L identical periods are T s The frequency-modulated sawtooth wave; the beat signal is divided into the following areas in one cycle T: a frequency corresponding to the first triangular wave is a positive first up-frequency beat signal S bau (t) and a negative first down-f...

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Abstract

The present invention relates to a frequency modulated continuous wave speed measurement and distance measurement method. The method comprises the steps of S1 transmitting a frequency modulated continuous wave signal of which the frequency changes along a combined waveform modulating signal to N targets, and obtaining a corresponding beat signal; S2 carrying out the one-dimensional FFT processing of a fast time domain on the beat signals within a cycle TTa and a cycle TTb to extract the spectral peak frequencies corresponding to the N targets in the cycle TTa and the cycle TTb; S3 calculating to obtain the corresponding distance speed matrixes in the cycle TTa and the cycle TTb; S4 finishing the correlation matching of multiple targets to obtain the distance r and the unambiguous inaccurate speed v corresponding to each target; S5 calculating to obtain the ambiguous accurate speed vapre corresponding to each target; S6 calculating to obtain the unambiguous accurate speed vpre corresponding to each target. According to the present invention, by utilizing an improved modulating signal and combining a two dimension FFT method, the purpose of high-precision speed measurement and distance measurement can be achieved under a smaller FFT point number.

Description

technical field [0001] The invention relates to frequency modulation continuous wave distance measurement and speed measurement technology, in particular to a high-precision frequency modulation continuous wave speed measurement and distance measurement method realized by using a combined waveform modulation signal. Background technique [0002] The basic principle of frequency modulation continuous wave distance measurement and speed measurement is: the frequency of the transmitted signal of the radar system changes according to a certain modulation signal, and the transmitted signal generates a delayed echo signal after encountering the target, and the echo signal is mixed with the transmitted signal to obtain There is a corresponding relationship between the difference frequency signal and the distance and speed of the target, and the speed measurement and ranging of the target can be realized by using the difference frequency signal. [0003] At present, there are two ma...

Claims

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Application Information

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IPC IPC(8): G01S13/34
CPCG01S13/343G01S13/345G01S13/347
Inventor 郭剑鹰王寰宇梁波王恺黄小勇朱春林孙胜亮郭茜茜
Owner HUAYU AUTOMOTIVE SYST
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