A Radar Echo Reconstruction Method Based on Adjacent Wave Correlation and Phase Layering

Abstract

The invention provides a radar echo reconstruction method based on adjacent wave correlation and phase layering. The method comprises the following steps: carrying out phase alignment through adjacent wave correlation: sampling adjacent echo pulses, carrying out correlation operation on the obtained sampled signals, and realizing echo phase pre-alignment according to the peak value of correlation result; establishing a phase difference sequence of an echo sampling sequence and carrying out linear fitting, and layering the phase difference sequence into a plurality of combinations having the same slope; and carrying out screening and reconstruction on the radar echo according to the layering result and utilizing the final reconstructed radar echo to carry out frequency estimation and speed calculation. The method is used for solving the problems of unaligned phase due to emission signals and echo correlation as well as echo phase jump due to object motion state or signal forwarding mechanism, thereby reducing speed measurement error when the object maneuver is large.

Description

technical field [0001] The invention relates to the field of radar measurement, in particular to a measurement echo signal processing method of a cooperative pulse radar speed measuring machine. Background technique [0002] The speed measurement principle of the traditional cooperative pulse radar speed measuring machine is as follows: figure 1 As shown, when the pulse radar speed measuring machine processes the received echo to obtain the speed value, it transmits the signal S t (n) is the reference signal, the echo S r (n) and reference signal S t (n) Correlation matched filtering is carried out, and the result of matched filtering is used as the echo data for velocity estimation. Doppler frequency estimation is performed after coherently accumulating echo data for a period of time, and then velocity estimation is performed using αβ filter. The traditional speed measuring machine shows good speed measuring performance for small maneuvering targets, but the reference si...

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Problems solved by technology

The traditional speed measuring machine shows good speed measuring performance for small maneuvering targets, but the reference signal of the traditional speed measuring machine is fixed as the transmission signal S t (n), the echo S after being reflected by the moving target r (n) with S t Compared with (n), it is equivalent to the motion modulation, when the target maneuver is large, such as image 3 Shown, S r (n) with S t (n) The coherence after the correlation will be lost, and at the same time affected by the target motion state or the signal forwarding mechanism, the echo S r The phase of (n) will appear a step jump phenomenon when the target maneuvers a lot, such as Figure 5 As shown, it will eventually lead to inaccurate speed measurement results, and the speed measurement error rate is as follows Figure 7 shown

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