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ISAR processing algorithm based on sea imaging

A processing algorithm and imaging technology, applied in the direction of radio wave reflection/re-radiation, using re-radiation, measuring devices, etc., can solve problems such as poor real-time performance and slow calculation speed, and achieve the effect of solving image defocus and improving computing efficiency

Inactive Publication Date: 2019-04-16
BEIJING HUAHANG RADIO MEASUREMENT & RES INST
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Problems solved by technology

[0003] Aiming at the problems of slow calculation speed and poor real-time performance in the prior art, the present invention proposes an ISAR processing algorithm based on sea imaging, which can quickly realize moving ship target imaging and obtain well-focused ship imaging results

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  • ISAR processing algorithm based on sea imaging
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  • ISAR processing algorithm based on sea imaging

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Embodiment Construction

[0022] The technical solution of the present invention will be further explained and described in detail below in conjunction with the accompanying drawings and a specific imaging process.

[0023] The sea imaging algorithm of the present invention utilizes the residual linear motion correction, the distance is transformed into the time domain of the distance, and the azimuth obtains the radar image of the whole beam irradiation area through FFT (Fast Fourier Transformation); through the CFAR (Constant False-Alarm Rate unit The average constant false alarm detection) detects the target information, and uses the phase error estimation operator of the PGA (the phase gradient autofocus algorithm) algorithm to complete the phase error estimation, realize the phase compensation, and complete the accurate focusing of the ship target, and obtain Well-focused ship imaging results.

[0024] The sea imaging in this embodiment is based on the 8-core parallel processing of the TMS320C6678...

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Abstract

The invention discloses an ISAR processing algorithm based on sea imaging. The ISAR processing algorithm based on sea imaging comprises the following steps that 1, distance FFT processing is performed, then residual linear distance travelling correction is performed, the data subjected to distance travelling correction is converted into a distance time domain; 2, distance CFAR detection is performed on radar echo data after distance pulse pressure; 3, the global minimum entropy is adopted to complete envelope alignment; 4, phase estimation is carried out by adopting a phase gradient self-focusing algorithm, and phase compensation is completed; 5, azimuth CFAR detection is performed on the compensated data; and 6, quantization processing is carried out. According to the ISAR processing algorithm, the moving ship target imaging can be rapidly realized, and a good focusing ship imaging result can be obtained.

Description

technical field [0001] The invention belongs to the software realization of the sea imaging algorithm, in particular to a method for quickly realizing the ISIR (Inverse Synthetic Aperture Radar) algorithm of the missile-borne radar imaging the ship moving on the sea. Background technique [0002] With the increasing complexity of the signal processing algorithm, the algorithm requires that the amount of data to be processed gradually increases to obtain more information. Although the processing capability of the signal processing extension is increasing day by day, there are still some hardware resources that restrict the processing speed. For example, due to the small high-speed memory on-chip, large data can only be stored in the external slow memory, which slows down the CPU processing speed. Therefore, it is necessary to design specific processing software to realize the fastest processing of the algorithm according to the existing resources of the signal processing unit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/90
Inventor 叶伟平何炜
Owner BEIJING HUAHANG RADIO MEASUREMENT & RES INST
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