Method for compensating relative motion of mobile multiple objective for reverse synthetic aperture radar

Abstract

A method for compensating relative motion of ISAR mobile multiobject gives motion compensation to subecho by picking up subecho of relative motion object from echo data being compensated primarily of mobile multiobject to overcome influence of Dopple diffusion caused by motion to object imaging ; then carrys out motion compensation secondarily to total echo to eliminate compensation error caused primary compensation for obtaining clear space two - dimensional distrubution map of high speed multiobject.

Description

technical field [0001] The invention belongs to the technical field of synthetic aperture radar imaging, and particularly relates to the motion compensation technology of a maneuvering target with relative motion. Background technique [0002] Inverse Synthetic Aperture Radar (abbreviation: ISAR) can conduct all-weather, all-time, long-distance imaging of moving targets such as missiles, satellites, ships, and celestial bodies from fixed or moving platforms. have important application value. Inverse synthetic aperture radar (ISAR) is based on the range-Doppler principle imaging. The key to imaging is motion compensation. Through motion compensation, a certain point on the target becomes a "fixed point", and the target's motion is equivalent to "circling" "fixed point" rotation, ISAR imaging is equivalent to turntable target imaging, and the latter is easy to implement. [0003] At present, there are many methods of motion compensation. In the distance compressed data, the ...

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Problems solved by technology

[0013] However, none of these algorithms solves the problem of relative motion between multiple targets such as multiple warheads and aircraft formations; it is especially inapplicable to target imaging such as missiles with high-speed motion, spin, and large relative motion between targets. Compensate for distance and phase caused by relative motion between targets

For multi-target echoes, when any one of the targets is used as a reference point for motion compensation, even if the compensation accuracy is very high, due to the relative motion between the targets, the Doppler frequency generated by the relative motion will cause Doppler frequency in the lateral direction. frequency shift, thus blurring the two-dimensional imaging or generating false target spatial distribution (see (b), (c) of Figure 5; (a) of Figures 6, 7, and 8)

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