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Signal reconstruction method and device

A signal reconstruction and equipment technology, applied in the field of radar, can solve the problems of SAR image azimuth ambiguity, poor robustness, channel error, etc., and achieve the effect of enhancing robustness and suppressing azimuth ambiguity

Active Publication Date: 2021-09-21
AEROSPACE INFORMATION RES INST CAS
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Problems solved by technology

However, channel errors will inevitably appear in the actual multi-channel SAR system, and the existing reconstruction methods are less robust to channel errors under non-uniform spatial sampling conditions, so this method will lead to reconstructed SAR images Severe azimuth ambiguity due to channel error occurs

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  • Signal reconstruction method and device
  • Signal reconstruction method and device

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Embodiment Construction

[0056] It should be understood that the specific embodiments described here are only used to explain the present application. It is not intended to limit the application.

[0057] An embodiment of the present application provides a signal reconstruction method, which is applied to a signal reconstruction device, figure 1 A flow chart of a signal reconstruction method provided in the embodiment of this application, such as figure 1 As shown, the signal reconstruction method may include:

[0058] S101. Establish a multi-channel SAR signal model according to azimuth receiving signals corresponding to multiple azimuth receiving channels of the multi-channel synthetic aperture radar SAR.

[0059] In the embodiment of the present application, the signal reconstruction device establishes a multi-channel SAR signal model according to azimuth receiving signals corresponding to multiple azimuth receiving channels of the multi-channel synthetic aperture radar SAR.

[0060] Specificall...

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Abstract

The embodiment of the invention provides a signal reconstruction method and device. The method comprises the following steps of: establishing a multi-channel synthetic aperture radar signal model according to azimuth receiving signals corresponding to a plurality of azimuth receiving channels of a multi-channel SAR; determining a sensitive function according to the multi-channel SAR signal model and channel error; establishing a preset constraint condition based on the sensitive function; based on the preset constraint condition, establishing a constraint optimization model of which the variable is a multi-channel signal reconstruction filter; and solving the constraint optimization model to obtain the multi-channel signal reconstruction filter under the preset constraint condition so as to realize signal reconstruction based on the multi-channel signal reconstruction filter.

Description

technical field [0001] The present application relates to the field of radar technology, in particular to a signal reconstruction method and device. Background technique [0002] For a multi-channel Synthetic Aperture Radar (SAR) system, spatial sampling cannot be directly replaced by temporal sampling, and a reconstruction method is needed to convert spatial sampling into temporal sampling. Under ideal conditions, the current existing reconstruction methods can restore the aliased Doppler spectrum with low ambiguity, and then reduce the requirements of multi-channel SAR systems for pulse repetition frequency without changing the azimuth resolution, so as to achieve high Sub-wide SAR imaging. However, channel errors will inevitably appear in the actual multi-channel SAR system, and the existing reconstruction methods are less robust to channel errors under non-uniform spatial sampling conditions, so this method will lead to reconstructed SAR images Severe azimuth ambiguity...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/90
CPCG01S13/90
Inventor 张永伟王伟张志敏邓云凯王宇
Owner AEROSPACE INFORMATION RES INST CAS
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