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FPGA based real-time imaging signal processing method and FPGA

A signal processing and real-time imaging technology, applied in the direction of reflection/re-radiation of radio waves, use of re-radiation, measurement devices, etc., can solve problems such as non-uniform sampling

Active Publication Date: 2017-08-29
王辉
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Problems solved by technology

[0006] The problem solved by the present invention is that the existing azimuth multi-channel system has the problem of azimuth non-uniform sampling; in order to solve the problem the present invention provides a FPGA-based azimuth multi-channel frequency modulation continuous wave SAR imaging method and FPGA

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  • FPGA based real-time imaging signal processing method and FPGA

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Embodiment Construction

[0035] Hereinafter, the present invention will be further elaborated in conjunction with the drawings and embodiments.

[0036] It can be seen from the background technology that the imaging quality of the existing azimuth multi-channel FMCW SAR is not good enough. According to the applicant's analysis, it is due to the problem of non-uniform sampling in the azimuth direction in the multi-azimuth channel system. To solve the problem, the applicant provides an FPGA-based azimuth multi-channel frequency-modulated continuous-wave SAR imaging method and an FPGA implementing the method in the present invention through further research.

[0037] The real-time imaging signal processing method of the FPGA-based frequency modulation continuous wave azimuth multi-channel FMCW SAR provided by the present invention includes:

[0038] Step 1. Completing the calculation of the reconstruction matrix and the reference function before receiving the echo data after starting up;

[0039] In thi...

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Abstract

The invention relates to an FPGA based real-time imaging signal processing method of an azimuth multi-channel FMCW SAR and an FPGA. The method comprises the steps that 1) a reconstruction matrix is calculated; 2) azimuth multi-channel data is reconstructed; 3) distance migration correction and distance compression are carried out on reconstructed echo data; and 4) azimuth inverse Fourier transform is carried out on the reconstructed echo data to obtain an SAR image. The step 2) further comprises that S2.1) echo data of different channels are zeroized at interval along the azimuth, and azimuth Fourier transform is carried out; 2.2) points in the same position in the azimuth of the different channels after azimuth Fourier transform are combined to a vector, the vector is multiplied by the reconstruction matrix, and azimuth data after reconstruction is obtained; and 2.3) the step 2.3) is carried out repeatedly on data of different range gates to obtain the reconstructed echo data. Thus, the image processing quality can be improved.

Description

technical field [0001] The invention belongs to the technical field of synthetic aperture radar imaging, and in particular relates to an FPGA-based real-time imaging signal processing method of frequency modulation continuous wave azimuth multi-channel FMCW SAR and the FPGA. Background technique [0002] Synthetic aperture radar is a kind of active microwave remote sensing equipment, which can realize earth observation all-weather and all-weather, and plays an important role in many fields of national economy and military application. [0003] Due to its small size, light weight, high resolution and low cost, FMCW SAR is favored in military and civilian fields, and countries all over the world have started the development of FMCW SAR systems. Multiple sets of airborne FMCW SAR systems have been successfully developed and tested. In 2009, the Netherlands Delft University of Technology (TU Delft), TNO (Netherlands National Institute of Applied Sciences), SSBV and other units ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/90
CPCG01S13/9011G01S13/9004
Inventor 王辉郑世超姜漫孙志超谢少彪
Owner 王辉
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