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FPGA realization method of SAR signal processing algorithm

An implementation method and signal processing technology, applied in computer control, reflection/re-radiation of radio waves, utilization of re-radiation, etc., to achieve the effects of good scalability, low power consumption, and strong computing power

Inactive Publication Date: 2017-06-27
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

[0005] The object of the invention of the present invention is to provide a FPGA implementation method of a SAR signal processing algorithm for the above-mentioned deficiencies in the background technology, which realizes the ultra-high-resolution imaging processing of the SAR echo signal and solves the problem of high-resolution imaging of the micro-SAR system. technical problem

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[0023] The technical solution of the invention will be described in detail below in conjunction with the accompanying drawings.

[0024] Polar Format Algorithm (PFA) is a traditional SAR imaging algorithm, which realizes the imaging of the scene by resampling the range and azimuth data. Affected by various factors such as airflow disturbance and electronic equipment accuracy, it is difficult for the carrier to maintain an ideal uniform linear motion, and a small deviation in the position of the carrier will introduce a large echo phase error. Without compensation, the image quality will deteriorate. Therefore, when using After the PFA performs imaging, it still needs to perform self-focusing processing on the processing results, which can effectively compensate for fast disturbance errors. It is an important supplement to the motion compensation unit, which can reduce the requirements for the accuracy of electronic equipment and improve the imaging quality.

[0025] The presen...

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Abstract

The present invention discloses an FPGA (Field Programmable Gate Array) realization method of a SAR (Synthetic Aperture Radar) signal processing algorithm, belonging to the radar imaging and digital signal processing technology field. The method comprises: building hardware configuration of an upper computer, an Ethernet data communication module, an algorithm processing module, a DDR3 SDRAM and a control module thereof, a data selection module, a reset module, a clock management module, the algorithm processing module is provided with a polar coordinate format imaging algorithm of dechirp signals based on the Chirp Scaling principle and a two-dimensional self-focusing algorithm, and therefore the problem of high resolution ratio imaging of a mini-type SAR system and the ultrahigh resolution imaging processing of SAR etch signals are realized.

Description

technical field [0001] The invention discloses an FPGA implementation method of a SAR signal processing algorithm, which uses the FPGA to implement the imaging processing of the PFA algorithm and the PGA algorithm based on the ChirpScaling principle, and belongs to the technical field of radar imaging and digital signal processing. Background technique [0002] Synthetic Aperture Radar (SAR) is a high-resolution imaging radar that can penetrate clouds and haze to image the ground. It has the characteristics of all-weather and all-day work that traditional optical imaging and infrared remote sensing do not have. Compared with the traditional radar that simply detects the position of the target, it has the ability to obtain the target image, so that it can obtain more information for target recognition, and plays an important role in the fields of enemy reconnaissance, environmental monitoring, emergency rescue and so on. The SAR system is mainly carried on satellites and larg...

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Application Information

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IPC IPC(8): G01S13/90G05B19/042
CPCG01S13/90G05B19/0428G05B2219/2656G01S13/9019
Inventor 李威崔爱欣朱岱寅胡晓琛张营许至威段化军
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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