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Real-time SAR imaging system and imaging method based on multi-core DSP

An imaging system and imaging method technology, applied in the field of SAR imaging, can solve the problems of large data volume and high real-time requirements of the SAR imaging system, and achieve the effect of increasing the computing speed and solving the large data volume

Inactive Publication Date: 2018-06-12
NANJING UNIV OF SCI & TECH
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Problems solved by technology

[0005] The purpose of the present invention is to provide a real-time SAR imaging system and imaging method based on multi-core DSP, to solve the problem that the SAR imaging system has a large amount of data and high real-time requirements

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Embodiment Construction

[0020] The present invention will be further described in conjunction with the accompanying drawings and specific embodiments.

[0021] A kind of real-time SAR imaging system based on multi-core DSP of the present invention comprises A / D input module, FPGA module, DSP module and D / A output module;

[0022] The A / D input module is used for sampling of imaging echo signals;

[0023] The FPGA module is used to receive the imaging echo signal and perform preprocessing, and send an interrupt to the DSP module after the preprocessing is completed;

[0024] The DSP module is used to focus the preprocessed imaging echo signals in azimuth and distance to obtain imaging results;

[0025] The D / A output module is used to output modulation signals.

[0026] Further, the DSP module is provided with an EMIF16 high-speed data interface for high-speed data communication between the DSP module and the FPGA module.

[0027] Further, the preprocessing includes low-pass filtering and orthogona...

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Abstract

The invention discloses a real-time SAR imaging system and an imaging method based on a multi-core DSP. The imaging system comprises an A / D input module, an FPGA module, a DSP module and a D / A outputmodule. The A / D input module is used for sampling imaging echo signals. The FPGA module is used for receiving the imaging echo signals, carrying out preprocessing, and sending interruption to the DSPmodule after the preprocessing is completed. The DSP module is used for carrying out azimuth and distance focusing on the preprocessed imaging echo signals and acquiring an imaging result. The D / A output module is used for generating the modulation signal of a radio frequency transmitter. In the invention, through an EMIF asynchronous interface, high speed data transmission between the multi-coreDSP and FPGA is realized; the multi-core DSP parallelly processes data so that high speed data processing is realized; and problems that the data size of the SAR imaging system is large, a real-time requirement is high and so on are effectively solved.

Description

technical field [0001] The invention relates to SAR imaging technology, in particular to a real-time SAR imaging system and imaging method based on multi-core DSP. Background technique [0002] Radar imaging technology uses electromagnetic waves in the microwave spectrum as the detection carrier, and obtains the electromagnetic scattering characteristics of the observed object through high-resolution radar. The most widely used radar imaging technology is synthetic aperture radar (SAR). Synthetic aperture radar has the advantages of all-day, all-weather, long-distance, high-resolution, wide survey swath, etc. It has shown excellent application value and broad application prospects in military and civilian fields. [0003] At present, the application of airborne and spaceborne SAR has been very extensive, and has achieved sub-meter resolution, and the quality of scene images is comparable to that of optical images for similar purposes. Utilizing the high-resolution capabili...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/90
CPCG01S13/904G01S13/9011
Inventor 赵惠昌黄以祥
Owner NANJING UNIV OF SCI & TECH
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