Isar imaging method based on arp segmented coherent accumulation of broadband direct acquisition data

Abstract

The invention relates to the signal processing technology of an inverse synthetic aperture radar imaging, in particular to an ISAR (Inverse Synthetic Aperture Radar) imaging method for accumulating broadband directly acquired data based on ARP (Address Resolution Protocol) segmentation coherent. The method comprising: utilizing the coherence of the directly acquired data to estimate a target motion parameter according to a motion parameter estimation method, and performing a coarse compensation to a target motion using the parameter; then performing segmentation coherent accumulation on a compensated complex one-dimensional distance image based on ARP to improve the signal-to-noise ratio of an echo; and finally performing accurate processing of envelope alignment, phase compensation and ISAR imaging. The ISAR imaging method for accumulating broadband directly acquired data based on ARP segmentation coherent, fully utilizes the coherence of a broadband directly acquired echo, adopts a target translational parameter estimation method based on broadband echo translational phase fitting, and based on which, develops a frequency domain motion coarse compensation method; and for an application condition of low signal-to-noise ratio, adopts an ARP segmentation coherent accumulation method to improve the signal-to-noise ratio, and further adopts an accurate envelope alignment and phasecompensation method to obtain a target ISAR image with higher translational compensation precision and better focusing performance.

Description

technical field [0001] The invention relates to an inverse synthetic aperture radar (Inverse Synthetic Aperture Radar, ISAR) imaging signal processing technology, in particular to an ISAR imaging method based on an average one-dimensional range profile (Average Range Profile, ARP) segmented coherent accumulation of broadband direct acquisition data. Background technique [0002] With the gradual improvement of my country's radar research level, and the development of space offensive and defensive countermeasures and ballistic missile defense technology, my country has developed a broadband high-resolution radar with space target monitoring and tracking capabilities. Based on the measured data obtained by these radars tracking space targets, many domestic units have carried out ISAR imaging research and obtained a number of valuable research results, which have improved the level of ISAR imaging research in my country. [0003] The deslope pulse compression method (Stretch) i...

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Problems solved by technology

[0005] Aiming at the problems existing in the above-mentioned prior art, the present invention proposes an ISAR imaging method based on ARP segmented coherent accumulation of broadband direct acquisition data to solve the problem that the real one-dimensional range image has a low signal-to-noise ratio and is not conducive to ISAR imaging processing: the Method Utilize the coherence of the directly collected data, estimate the motion parameters of the target according to the motion parameter estimation method, and use the parameters to roughly compensate the motion of the target; In order to improve the signal-to-noise ratio of the echo; finally, precise envelope alignment, phase compensation and ISAR imaging processing are performed; this method can reduce the requirements for the signal-to-noise ratio of the echo, improve the accuracy of motion compensation, and finally obtain a better degree of focus ISAR image

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