Large-angle non-uniform rotation space target ISAR imaging method

A technology of rotating space and imaging method, which is applied in the direction of radio wave reflection/re-radiation, using re-radiation, measuring devices, etc., which can solve the problems of difficult to quickly and accurately obtain the target rotation parameters, large amount of calculation, etc.
CN110501706AActive Publication Date: 2019-11-26NAT UNIV OF DEFENSE TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
NAT UNIV OF DEFENSE TECH
Publication Date
2019-11-26

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Abstract

The invention relates to the inverse synthetic aperture radar imaging signal processing technology, and especially relates to a large-angle non-uniform rotation space target ISAR imaging method. Basedon attitude stability of a space target, a corner change curve of the target is calculated according to radar narrowband tracking information, and non-uniform rotation parameters of the space targetare fitted. Then, rotation center searching is performed on one-dimensional distance image data obtained after translational compensation, and high-order phase and envelope walk momentum compensationcaused by a large rotation angle is achieved. Slow-time non-uniform resampling is performed based on a condition that a scattering point Doppler frequency caused by non-uniform rotation is changed along with time so that the Doppler frequency in an azimuth direction is constant. And finally, Keystone transform is adopted to eliminate distance-crossing unit walking, azimuth compression is realizedthrough Fourier transform, a high-quality target ISAR image is obtained, and an ISAR imaging problem under the condition of space target large-rotation-angle non-uniform rotation is effectively solved. The method plays an important role in promoting broadband radar target identification to develop towards practical and fine directions.
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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 for a large-angle non-uniform rotating space target. Background technique

[0002] ISAR has the ability of two-dimensional high-resolution imaging of non-cooperative targets, and is widely used in various military and civilian backgrounds. The high resolution in the range direction can be obtained by transmitting a large bandwidth signal, while in the azimuth direction, the high resolution is obtained by using the phase modulation generated by the rotation of the target relative to the radar line of sight. Generally speaking, in order to better interpret the target, the azimuth resolution of the ISAR image should be equivalent to the range resolution. Therefore, after obtaining a high resolution in the range direction, the resolution in the azimuth direction needs to be impr...

Claims

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