Target three-dimensional rotation vector estimation method based on interference inverse synthetic aperture radar

Abstract

The invention discloses a target three-dimensional rotation vector estimation method based on an interference inverse synthetic aperture radar. The method comprises the following steps that pulse compression, translation compensation and over-distance migration correction echo preprocessing is carried out on data of three receiving channels of the interference inverse synthetic aperture radar; inverse synthetic aperture radar imaging processing is carried out on the preprocessed echo data to obtain three complex images, registration is carried out on the three complex images by taking one image as a reference, interference is carried out on the two complex images on the same baseline to obtain interference phases of the two images, and then coordinates of a target in the baseline directionare estimated; 3D coordinate estimation of the target is realized in combination with the time delay of the sight line direction; distance units containing scattering centers in the preprocessed echodata are extracted, LvD conversion is performed on azimuth echoes of each distance unit, and a center frequency and a modulation frequency corresponding to each scattering center echo in the distanceunit are estimated; regression analysis is carried out on the center frequency, the frequency modulation rate and the 3D coordinate estimation corresponding to each scattering center echo, and a 3D rotation vector of the target is estimated.

Description

Technical field[0001]The present invention relates to the field of radar signal processing, and more particularly to the identification and tracking of targets in radar applications, and more particularly to a target three-dimensional flip vector estimation method based on interference reverse synthetic aperture radar.Background technique[0002]Interference Inverse Synthetic Aperture Radar (INISAR) is formed to form two orthogonal baselines by a plurality of specific arranged antennas to obtain interference phase, and then obtain the dimension of the target along the baseline direction, and utilize the delay of the target echo on the radar line direction. To the size, the reconstruction of 3D (3D) targets (literature [1]: g.wang, x.xia, andv.c., "Three-Dimensional Isar Imaging of Maneuvering Targets Using Threerecers," IEEE Trans. Imaging Process ., Vol.10, No.3, PP.436-447, Mar.2001).[0003]The 3D rotation vector of the target can completely describe the rotation gesture of the targe...

AI Technical Summary

Problems solved by technology

However, LPFT can only process signals containing a single CR. If the signal contains multiple different CR components, LPFT will no longer be applicable.

In practical applications, a range unit often contains multiple scattering centers, and the CR of the Doppler frequency of different scattering centers may be very different. In this case, continuing to use the CR estimated by LPFT for 3D rotation vector estimation will cause big error

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