Measuring device for accurate correction by FMCW radar distance measurement and compensation correction method

Abstract

The invention relates to a measuring device for accurate correction by FMCW radar distance measurement and a compensation correction method, which belong to the technical field of FMCW radar measurement. The measuring device is characterized by comprising an echo signal processing module (1), a peak value extracting module (2), a high-precision phase difference compensation module (3), a frequencydistance conversion module (4) and a display module (5), wherein the echo signal processing module (1) is used for receiving high-frequency echo signals; high-frequency transmission signals are processed by mixing frequency to obtain intermediate frequency signals of 0 kHz to 200 kHz; a threshold valve curve is set for removing disturbance and filtering other signals; frequency domain peak valuesignals are locked; a signal processing unit of a DSP is used for recording all data and storing the data in a data storage unit; the DSP is used for extracting recording signals; the improved high-precision phase difference compensation of the data is carried out and frequency is converted into distance and displayed on the modules (4) and (5). The invention reserves the advantage of a traditional phase difference method and enhances the computing precision of frequency spectrum on the premise of averagely adding 25% of computing quantity.

Description

technical field [0001] The invention belongs to the technical field of FMCW radar measurement, and in particular relates to a measurement device and a compensation correction method for accurate correction of FMCW radar range measurement. Background technique [0002] According to the principle of FMCW radar ranging, the microwave device emits frequency-modulated continuous waves, and the beat signal output by mixing the transmitted signal and the echo signal is ideally a sinusoidal signal, and its frequency f is proportional to the measured distance R, which can be expressed as It is f=2RB / cT, that is, the relative error of the distance measurement is the same as that of the frequency measurement. [0003] The main purpose of signal processing is to accurately obtain the frequency of the beat signal, so as to obtain the measured distance. Usually, the phase method is used to obtain the signal frequency: for example, S.A.Tretter proposed that the frequency of a single-frequ...

AI Technical Summary

Problems solved by technology

However, the correction accuracy of the all-phase FFT spectrum analysis method is low, and the frequency correction error of the all-phase method is less than 10 when there is no noise. -7 Δf, the frequency correction error is 10 at low noise -4 ~10 -5 Δf

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