FPGA (Field Programmable Gate Array)-based video SAR (synthetic aperture radar) high-speed processing technology implementation method

Abstract

The invention discloses an FPGA (Field Programmable Gate Array)-based video SAR (synthetic aperture radar) high-speed processing technology implementation method and belongs to the radar imaging technical field and digital signal processing technical field. The method includes the following steps that: 1, SAR original echo data and parameters are sent to an FPGA chip through a host computer and aGigabit Ethernet; 2, frame extraction is performed on the echo data in an overlapping manner, and an overlap rate is set, so that a frame rate can be improved, parameters required by the PFA processing of each frame of data are calculated; 3, multi-pulse parallel range direction processing is realized based on a scale transformation principle, so that a range direction processing speed can be increased; 4, data which have been processed in a range direction are transferred into an DDR; and 5, azimuth direction multi-pulse parallel processing is realized based on high-precision SINC interpolation. With the method adopted, the high-speed processing of a video SAR can be improved, an imaging processing speed higher than 5 frames / second can be realized, and a foundation is laid for the real-time performance of the imaging processing of the video SAR.

Description

technical field [0001] The invention relates to an FPGA implementation method of video SAR high-speed processing technology, and belongs to the technical fields of radar imaging and digital signal processing. Background technique [0002] Close air support systems, taking the American AC-130 as an example, mostly use optical sensors to detect and track targets. Although the optical sensor has the advantages of short wavelength and high angle measurement accuracy, it is easily affected by atmospheric attenuation dust and strong light, and the detection distance is limited, so it is difficult to adapt to the battlefield environment with changeable weather and smoke. Compared with optical sensors, synthetic aperture radar (SAR) has the characteristics of high all-weather resolution and strong penetrating ability, and is not affected by bad weather such as fog, rain and clouds. An important means of reconnaissance. VideoSAR (Video Synthetic Aperture Radar) is a new imaging mod...

AI Technical Summary

Problems solved by technology

Although the optical sensor has the advantages of short wavelength and high angle measurement accuracy, it is easily affected by atmospheric attenuation dust and strong light, and the detection distance is limited, so it is difficult to adapt to the battlefield environment where the weather is changeable and smoke is everywhere.

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