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Multi-channel SAR range ambiguity suppression method and device

A range ambiguity and multi-channel technology, applied in the field of radar, can solve the problems of suppression ability decline, multi-channel SAR system range ambiguity, etc., and achieve the effect of suppressing range ambiguity

Active Publication Date: 2021-07-27
AEROSPACE INFORMATION RES INST CAS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003]At present, the traditional reconstruction algorithm in the APC multi-channel SAR system will lead to the decline of APC's ability to suppress the range ambiguity, and even worsen the range ambiguity of the multi-channel SAR system

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  • Multi-channel SAR range ambiguity suppression method and device
  • Multi-channel SAR range ambiguity suppression method and device

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Embodiment Construction

[0024] In order to make the purpose, technical solutions and advantages of the application clearer, the application will be further described in detail below in conjunction with the accompanying drawings. All other embodiments obtained under the premise of creative labor belong to the scope of protection of this application.

[0025] In the following description, references to "some embodiments" describe a subset of all possible embodiments, but it is understood that "some embodiments" may be the same subset or a different subset of all possible embodiments, and Can be combined with each other without conflict. Unless otherwise defined, all technical and scientific terms used in the embodiments of the present application have the same meaning as commonly understood by those skilled in the technical field of the embodiments of the present application. The terms used in the embodiments of the present application are only for the purpose of describing the embodiments of the pres...

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Abstract

The embodiment of the invention provides a multi-channel SAR range ambiguity suppression method and device, and the method comprises the steps: carrying out the azimuth phase coding of each transmission pulse of a multi-channel SAR system, and obtaining a phase-weighted transmission pulse; performing azimuth phase demodulation on the echo of each emission pulse after phase weighting to obtain a demodulation signal; constructing a reconstruction optimization model which takes the azimuth ambiguity power of the demodulation signal as a quadratic constraint and takes the distance ambiguity power of the demodulation signal as a target function; solving the reconstruction optimization model to obtain a multi-channel SAR reconstruction filter; and suppressing the range ambiguity of the multi-channel SAR system through the multi-channel SAR reconstruction filter. Therefore, the range ambiguity suppression method provided by the embodiment of the invention can be applied to an APC multi-channel SAR system, and range ambiguity can be effectively suppressed through a multi-channel SAR reconstruction filter.

Description

technical field [0001] The embodiment of the present application relates to the field of radar technology, and relates to but not limited to a multi-channel SAR range ambiguity suppression method and device. Background technique [0002] Multi-channel Synthetic Aperture Radar (SAR, Synthetic Aperture Radar) system refers to the SAR system with single transmission and multi-reception along the azimuth direction. In order to solve the problems of insufficient spatial freedom of traditional SAR systems, contradictions between resolution and swath width, and fuzzy relationship constraints. Azimuth Phase Coding (APC, Azimuth Phase Coding) refers to the technology of phase coding each transmit pulse along the azimuth direction. This technology has low system complexity and can suppress the range ambiguity of distributed targets, but requires a larger PRF. The APC multi-channel SAR system refers to the application of APC technology to the multi-channel SAR system, and further impr...

Claims

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Application Information

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IPC IPC(8): G01S13/90G01S7/41
CPCG01S13/9004G01S7/415
Inventor 张永伟王伟张志敏王宇
Owner AEROSPACE INFORMATION RES INST CAS
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