ISAR high resolution imaging method based on maximum mutual information criterion

A technology of maximum mutual information and imaging method, applied in the field of radar, can solve problems such as reducing the quality of two-dimensional imaging, reducing the quality of imaging, and complicated processes
CN108919263AActive Publication Date: 2018-11-30XIDIAN UNIV
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
XIDIAN UNIV
Publication Date
2018-11-30

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Abstract

The invention discloses an ISAR high resolution imaging method based on maximum mutual information criterion to mainly solve the problem about high resolution ISAR imaging for a target under clutter and noise. According to the technical scheme, the method comprises the following steps that environment and target information is obtained; optimal transmitting waveform energy spectrum are solved based on the maximum mutual information criterion; imaging signal are modulated based on the energy spectrum; optimized waveform are transmitted and echo thereof are recorded; a distance dictionary is constructed according to the optimized waveform, and optimized waveform echo signal waveform is subjected to the variational bayesian algorithm to reconstruct a range image matrix; and an azimuth dictionary is constructed, and the range image matrix is subjected to the variational bayesian algorithm for reconsitution to obtain targeted high resolution two-dimensional imaging results with excellent focusing effect. Suppression of clutter and noise under clutter and noise is achieved. Targeted and optimized waveform echo mutual information is improved. High resolution two-dimension ISAR imaging results of the target are obtained and are used for target feature extraction and recognition.
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Description

technical field

[0001] The invention belongs to the technical field of radar, and further relates to ISAR imaging and waveform optimization, in particular to an ISAR high-resolution imaging method based on the maximum mutual information criterion, which can be used for high-resolution imaging of space targets in complex electromagnetic environments. Background technique

[0002] Under the condition of high signal-to-noise ratio, the existing inverse synthetic aperture radar (ISAR) can obtain well-focused images, but when the electromagnetic environment is complex, it is difficult to achieve high-resolution imaging of space targets. The traditional radar system has a fixed transmission waveform, and does not use the environment and target information to optimize the design of the transmission waveform, which limits the imaging performance of the radar to the target in environments such as clutter and interference. Cognitive Inverse Synthetic Aperture Radar (Cognitive ISAR) ca...

Claims

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