ISAR Imaging Method for Large Angle Non-uniform Rotating Space Target
A technology of rotating space and imaging method, which can be used in the reflection/re-radiation of radio waves, the use of re-radiation, measurement devices, etc., which can solve the problems of large amount of calculation and difficult to obtain the target rotation parameters quickly and accurately.
Active Publication Date: 2020-03-24
NAT UNIV OF DEFENSE TECH
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Problems solved by technology
Due to the non-cooperative nature of the target, the method of estimating the motion parameters at the same time has to solve and fit all the distance units, and the amount of calculation is large, so it is difficult to quickly and accurately obtain the rotation parameters of the target
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[0079] The present invention will be further described below in conjunction with accompanying drawing:
[0080] figure 1 It is the general processing flow of the present invention.
[0081] An ISAR imaging method for a large-angle non-uniform rotating space object described in the present invention, the method includes the following steps:
[0082] S1: radar echo pulse compression;
[0083] S2: One-dimensional range image translation compensation;
[0084] S3: Fitting target rotation parameters based on radar measurement parameters;
[0085] S4: Rotation center estimation and high-order term compensation based on minimum entropy;
[0086] S5: Non-uniform sampling with slow time between pulses;
[0087] S6: Correction of over-distance unit walking based on Keystone transformation;
[0088] S7: Azimuth to Fourier transform to acquire ISAR images.
[0089] The beneficial effects of the present invention will be tested with simulation data below.
[0090] like figure 2 a...
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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.
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...
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IPC IPC(8): G01S13/90
Inventor 田彪卢哲俊霍凯刘永祥黎湘姜卫东
Owner NAT UNIV OF DEFENSE TECH