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Improved method of distance measurement accuracy of linear frequency-modulated continuous wave detection system

A detection system and distance measurement technology, which is applied in radio wave measurement system, radio wave reflection/re-radiation, measurement device, etc., can solve the problems of difficult realization of real-time signal processing and increased calculation amount, and achieve easy pipeline operation, Improve the accuracy of distance measurement and the effect of simple calculation formula

Active Publication Date: 2019-08-09
THE 28TH RES INST OF CHINA ELECTRONICS TECH GROUP CORP
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AI Technical Summary

Problems solved by technology

The target distance detection accuracy is affected by the sampling interval of the difference frequency signal. The usual method is to increase the number of FFT points N, but increasing the number of FFT points N will greatly increase the amount of calculation, which is difficult to achieve in real-time signal processing.
Moreover, due to the comprehensive influence of the system's linear frequency conversion coefficient, frequency conversion range, scanning repetition period, and detection distance, the increase in the number of FFT points N is also limited.

Method used

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Embodiment Construction

[0029] The following examples further illustrate the present invention.

[0030] The invention provides a method for improving the distance measurement accuracy of a linear frequency modulation continuous wave detection system. The specific method operation steps are as follows:

[0031] Step 1. Perform analog-to-digital conversion A / D sampling on the difference frequency signal to obtain N=2 n sequence data, where n is an integer; the detection system mixes the reflected signal with the transmitted signal, filters out the difference frequency signal through a filter, and filters out the difference frequency signal outside the detection range according to the distance detection range of the system, and retains the difference within the detection range The reflected difference frequency signal; the difference frequency signal is amplified to the appropriate voltage range corresponding to the digital-to-analog conversion chip A / D, and the analog signal is converted into a digita...

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Abstract

The invention relates to an improved method of distance measurement accuracy of a linear frequency-modulated continuous wave detection system. The linear frequency-modulated continuous wave detectionsystem has outstanding advantages of low transmission power, high receiving sensitivity, high range resolution and simple structure and the like and has the stronger target identification, anti-background clutter and anti-interference abilities than the pulse system. In addition, for spectrums obtained by fast Fourier transform (FFT), discrete spectrums occur in a frequency range with the frequency component as the center under the non-simultaneous sampling; spectral lines beyond the signal frequency component are indicated to be leaked from the signal component, so that the spectrum leakage occurs. Moreover, offsets exit between the frequencies corresponding to all discrete spectral lines and the signal frequency component, so that the fence effect exists. In order to avoid the phenomena,the invention puts forward a method for improving the measurement accuracy of the signal frequency based on the invariable point number N of FFT to improve the distance measurement accuracy by usingthe signal amplitude distribution caused by spectral leakage.

Description

technical field [0001] The invention relates to an improved method for improving distance detection accuracy of a linear frequency modulation continuous wave detection system. Background technique [0002] The linear frequency modulation continuous wave detection system has outstanding advantages such as low transmission power, high receiving sensitivity, high distance resolution and simple structure. to develop rapidly. [0003] The operating frequency of the linear frequency modulation continuous wave detection system changes continuously in a linear manner. In a scanning period, the transmitting antenna radiates a group of equal amplitude frequency modulation continuous waves, and the signal frequency increases linearly from the start frequency to the stop frequency. The receiving antenna receives the reflected signal from the target. Due to the transmission delay of the transmitted wave, there is a time difference and a frequency difference between the reflected signal ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/32
CPCG01S13/32
Inventor 闫修林宋建宇钱晓坚于荣钱葵东崔自峰王冉
Owner THE 28TH RES INST OF CHINA ELECTRONICS TECH GROUP CORP
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