Self-focusing method of multi-base outer radiation source radar imaging system

Abstract

The invention discloses a self-focusing method of a multi-base outer radiation source radar imaging system, wherein the self-focusing method mainly settles a problem of image defocusing caused by direct recovery of a target scene on condition of no consideration of a phase error in a traditional compression sensing algorithm. The self-focusing method comprises the realizing processes of 1), selecting an outer radiation source signal, establishing an observation model; 2), initializing a phase difference to zero, and acquiring a target echo vector; 3), applying the compression sensing algorithm on the target echo vector for estimating a target reflection coefficient vector, establishing a reconstruction error of the target scene according to the target reflection coefficient vector in two adjacent iterations; 4), calculating a phase error through the minimizing condition of the reconstruction error of the target scene; and 5), calculating whether the phase error satisfies an iteration stopping condition, if yes, stopping iteration for obtaining a phase error, and otherwise, returning the step 3) after the target echo vector is updated. The self-focusing method improves imaging resolution and can be used for performing high-resolution imaging on the multi-base outer radiation source radar imaging system.

Description

technical field [0001] The invention belongs to the technical field of radar, and further relates to a self-focusing method, which can be used to realize high-resolution imaging of a multi-base external radiation source radar imaging system. Background technique [0002] External radiation source radar refers to a radar system that uses non-cooperative third-party radiation signals such as live TV satellites, navigation, communication stations, television, and radio as the emission source, and does not emit signals itself. This type of radar has the characteristics of strong survivability, good anti-interference performance, and can detect stealth targets and low-altitude targets. Therefore, multistatic external emitter radar systems are widely used in target detection and tracking. Due to the imaging function, the target recognition ability of the multi-base external radiation source radar system will be greatly improved, and its practical application will be effectively e...

AI Technical Summary

Problems solved by technology

However, due to the poor distance resolution of the narrow bandwidth signal imaging system, the image resolution is low when the conventional self-focusing technology is applied to the narrow bandwidth signal imaging system, and high-resolution imaging cannot be achieved.

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