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Variable PRI squint bunching SAR imaging method, device and equipment and storage medium

A technology of imaging and slant distance history, which is applied in the directions of measuring devices, radio wave reflection/re-radiation, instruments, etc., and can solve the problem that imaging algorithms cannot effectively solve squint spotlight SAR systems, echo data azimuth signal undersampling, etc. question

Active Publication Date: 2019-05-21
CETC OCEAN INFORMATION CO LTD
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Problems solved by technology

[0004]However, if the SAR system adopts the variable PRI strategy, due to the change of PRI, the slope range history of the echo data of the SAR system will change, and the azimuth signal will also have abnormal Uniform sampling; and in the spotlight mode, the azimuth signal of the echo data of the SAR system still has the problem of undersampling. problem with imaging

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  • Variable PRI squint bunching SAR imaging method, device and equipment and storage medium
  • Variable PRI squint bunching SAR imaging method, device and equipment and storage medium
  • Variable PRI squint bunching SAR imaging method, device and equipment and storage medium

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[0083] The application will be further described in detail below with reference to the drawings and embodiments. It can be understood that the specific embodiments described here are only used to explain the related invention, but not to limit the invention. In addition, it should be noted that, for ease of description, only the parts related to the invention are shown in the drawings.

[0084] It should be noted that the embodiments in the application and the features in the embodiments can be combined with each other if there is no conflict. Hereinafter, the present application will be described in detail with reference to the drawings and in conjunction with embodiments.

[0085] Please refer to figure 1 , figure 1 It shows a schematic flowchart of an imaging method for a squint spotlight SAR with variable PRI provided by an embodiment of the present application. Such as figure 1 As shown, the method includes the following specific steps:

[0086] S1. Restore the range migra...

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Abstract

The invention discloses a variable PRI squint bunching SAR imaging method and device, equipment and a storage medium. The invention relates to the technical field of synthetic aperture radars. According to the technical scheme, the method comprises the steps of recovering a range migration form of radar echo data in a variable PRI mode; removing azimuth spectrum aliasing and range direction time domain aliasing of the radar echo data; restoring the sampling uniformity of azimuth signals of the radar echo data; performing phase compensation on the restored radar echo data; and carrying out imaging on the radar echo data subjected to phase compensation. According to the technical scheme provided by the embodiment of the invention, under-sampling under the condition that the azimuth signal ofthe radar echo data under the variable PRI mode is non-uniform can be restored under the condition that the calculation efficiency is ensured, so that the processing efficiency of the frequency domain imaging algorithm is improved.

Description

Technical field [0001] The present disclosure generally relates to the technical field of synthetic aperture radar, and specifically relates to a squint spotlight SAR imaging method, device, equipment and storage medium with variable PRI. Background technique [0002] For spaceborne synthetic aperture radar (Synthetic Aperture Radar, SAR), its imaging modes include front-view, side-view and squint mode. Compared with the front and side view situations, the squint mode increases the maneuverability and flexibility of the spaceborne synthetic aperture radar system. With the beam pointing adjustment, it can realize the short-term revisit of the area of ​​interest; it depends on the detection radar cross section Military targets from the observation point of view are particularly important. [0003] In the case of squint spotlighting, if the SAR system uses a fixed pulse repetition interval (Pulse Repetition Interval, PRI), there is a distance movement item in the distance history fro...

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Application Information

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IPC IPC(8): G01S13/90
Inventor 梁新赵硕赵正健辛甜甜
Owner CETC OCEAN INFORMATION CO LTD
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