Speed compensation method of one-dimensional distance images of moving object

Abstract

The invention discloses a speed compensation method of one-dimensional distance images of a moving object. The method comprises the steps of: caching one-dimensional distance images continuously obtained by a radar in preset time intervals to a buffer; carrying out pre-processing on the one-dimensional distance images cached in the buffer, obtaining an analysis window of the one-dimensional distance images, and removing noises; then carrying out cross-correlation processing on all the one-dimensional distance images, arranged in the analysis window, of the buffer; estimating an object envelopment moving amount, adding a reference signal time-delay corresponding position, and obtaining the practical position of the object; obtaining a speed estimation value of the one-dimensional distance images by a primary curve fitting method; according to the speed estimation value of the one-dimensional distance images, carrying out speed compensation on the one-dimensional distance images; and carrying out variance estimation on each one-dimensional distance image after the speed compensation, and determining whether a pulse number used for the speed compensation meets error requirements. By adopting the method provided by the invention, unfavorable influences caused by high-speed movement can be effectively eliminated.

Description

Technical field [0001] The invention relates to a radar target feature recognition technology, in particular to a speed compensation method for a one-dimensional range profile of a moving target. Background technique [0002] Inverse synthetic aperture radar (ISAR) imaging technology is developed on synthetic aperture radar technology. The ISAR imaging system is an imaging system with a stationary radar and a moving target. Unlike traditional radars, ISAR is a high-resolution imaging radar that can obtain accurate images of non-cooperative moving targets at a long distance. [0003] As a valuable detection method, ISAR imaging technology has received extensive attention in the past few decades. There are a large number of orbiting spacecraft in operation in space, in addition to a huge number of space debris, meteorites, and invalid spacecraft. Imaging these targets is an important part of space exploration. However, the research on ISAR technology so far has mainly focused on ai...

AI Technical Summary

Problems solved by technology

[0005] When the radial movement speed of the measured target is low, the echo after full de-skewing processing is approximately a sinusoidal signal, and the one-bit range image of the target can be obtained through pulse compression; but when the observed object is a high-speed moving space orbit spacecraft When the target is targeted, due to the high radial velocity of the target relative to the radar, the echo of the receiving scattering point is a linear frequency modulation (LFM) signal (no longer a single-frequency signal under low-speed motion), and the high-speed moving target obtained after pulse compression processing The distance image is severely distorted

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