Non-uniform distributed multi-baseline synthetic aperture radar three-dimensional imaging method

Abstract

The invention discloses a non-uniform distributed multi-baseline synthetic aperture radar three-dimensional imaging method, and relates to the three-dimensional imaging technology. The method comprises the following steps of: performing two-dimensional focusing on primary echo data obtained by flying observation at each time to obtain single-look complex images; registering sequences of the single-look complex images to acquire non-uniform sampling data of an observation target under different visual angles; removing inclination aiming at the non-uniform sampling data to perform phase modulation; then estimating a spatial spectrum of the primary uniform sampling data by using a missing data-based amplitude phase estimation method and maximizing mathematically expected iterative operation of observation data so as to implement imaging of a target height direction; and finishing three-dimensional imaging of the target by combining a two-dimensional target image obtained in two-dimensional imaging of each track. The method for performing the imaging of the height direction based on the amplitude phase estimation method reduces elevation blur caused by multi-baseline non-uniform distribution and acquires clear high-resolution target three-dimensional imaging results.

Description

technical field [0001] The invention relates to the technical field of three-dimensional radar imaging, and relates to a processing method for three-dimensional imaging of multi-baseline synthetic aperture radar with non-uniform distribution. Background technique [0002] Multi-baseline Synthetic Aperture Radar (SAR) is realized through multiple repeated flights of the radar platform in the height direction, and multiple samples of the target along the height direction under different viewing angles are collected, forming a height-wise synthetic aperture, which has Resolving power; combined with azimuth-up aperture synthesis and distance-up pulse compression, the three-dimensional imaging of the observation target is realized. In 2000, German scholar A. Reigber et al. conducted a research on the analytical modeling of multi-baseline SAR three-dimensional imaging in the paper "First Demonstration of Airborne SAR Tomography Using Multibaseline L-Band Data", and proposed the us...

AI Technical Summary

Problems solved by technology

These methods are based on the interpolation method, but it is very difficult to construct a suitable interpolation factor according to the characteristics of the height-oriented synthetic aperture data, and it is difficult to obtain accurate height-oriented imaging results; the 3D imaging simulation experimental results obtained by using these methods are not ideal , the processing of the actual non-uniform multi-baseline SAR data has not been carried out

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