Radar Ranging Method Based on Spectrum Thinning

Abstract

The invention provides a radar ranging method based on spectrum zooming. The radar ranging method includes the step of receiving radar echo intermediate frequency signals x(n) of a target and dividing the radar echo intermediate frequency signals x(n) into two paths, the step of conducting windowing on the two paths of the radar echo intermediate frequency signals to obtain windowed signal data f<1>(n) and windowed signal data f<2>(n), the step of conducting FFT processing on the signal data f<2>(n) to obtain echo data F(k) and further obtain an estimated frequency value (N<max>) of the echo data F(k), the step of determining initialization parameters of spectrum zooming on the basis of the estimated frequency value (N<max>), the step of conducting spectrum zooming on the signal data f<1>(n) on the basis of the initialization parameters of spectrum zooming to obtain a sequence X(z<k>) after spectrum zooming, the step of searching for the serial number i corresponding to the maximum value in the sequence X(z<k>) and obtaining an estimated frequency value f<IF> of the radar echo intermediate frequency signals through the serial number i, and the step of working out the accurate distance r of the target through the estimated frequency value f<IF> of the radar echo intermediate frequency signals x(n). The radar ranging method based on spectrum zooming meets the requirement of an LFMCW radar system for real-time performance and has adaptivity to changes of the distance of the radar target.

Description

technical field [0001] The invention relates to the radar field, in particular to a radar ranging method based on frequency spectrum refinement. Background technique [0002] Radar ranging technology has been used in various aspects of military and civilian fields. With the rapid progress of electronic science and technology, especially the development of microwave integrated circuits and digital signal processing technology, it provides a strong technical guarantee for the rapid development of precision ranging radar. [0003] Linear Frequency Modulation Continuous Wave (LFMCW) radar has many advantages that other radars do not have: no distance blind zone, high distance resolution, and low radiation power. Because of the above advantages, linear frequency modulation continuous wave radar is usually Equipped as an on-site industrial level test instrument, it is used to measure the height of materials in tanks, warehouses and other areas, so as to obtain relevant industrial...

AI Technical Summary

Problems solved by technology

Due to the high accuracy required for the distance measurement of the material level, but the discrete Fourier transform has a fence effect, the selected peak point is only accurate when the measurement distance is an integer multiple of the measurement accuracy, and there will be inherent system errors at other distances

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