Imaging processing device of satellite-borne TOPSAR (Terrain Observation by Progressive Scans Synthetic Aperture Radar) data and processing method thereof

An imaging processing and data technology, applied in the field of signal processing, can solve problems such as reducing processing efficiency

Inactive Publication Date: 2010-09-15
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, most of the processing of TOPSAR data needs to be divided into blocks to solve the aliasing frequency domain aliasing, which reduces the processing efficiency and introduces additional stitching steps

Method used

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  • Imaging processing device of satellite-borne TOPSAR (Terrain Observation by Progressive Scans Synthetic Aperture Radar) data and processing method thereof
  • Imaging processing device of satellite-borne TOPSAR (Terrain Observation by Progressive Scans Synthetic Aperture Radar) data and processing method thereof
  • Imaging processing device of satellite-borne TOPSAR (Terrain Observation by Progressive Scans Synthetic Aperture Radar) data and processing method thereof

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Embodiment

[0227]Utilize the present invention to process the simulation point target (simulation parameters as shown in Table 1), on this basis, the test of the effectiveness, accuracy and high efficiency of the present invention has been completed, and Table 2 provides the processing result resolution, peak value respectively The evaluation results of sidelobe ratio and integral sidelobe ratio, Figure 14 A profile diagram of the azimuthal compression results for a point target is given, Figure 15 A profile diagram of the rangewise compression results for point targets is given.

[0228] Table 1 Simulation parameter table

[0229]

[0230] After processing, the results are shown in Table 2:

[0231] Table 2 Evaluation of treatment result indicators

[0232]

[0233] From Form 2 and Figure 14 and Figure 15 From the results shown, it can be seen that the present invention can effectively complete the processing of TOPSAR data, and the processing result is consistent with th...

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Abstract

The invention discloses an imaging processing device of satellite-borne TOPSAR (Terrain Observation by Progressive Scans Synthetic Aperture Radar) data and a processing method thereof. The device comprises a data storage module, a frequency domain expanding module, a data focusing module and a time domain expanding module. The method comprises the following steps of: (1) reading in and storing TOPSAR data; (2) carrying out frequency domain expansion on the TOPSAR data in azimuth dimension; (3) focusing the TOPSAR data; and (4) carrying out time domain expansion on the TOPSAR data in the azimuth dimension to finish the exact imaging processing of the TOPSAR data. In the frequency domain expansion, the frequency domain is achieved by utilizing the Fourier transform, thus the computation burden is reduced, the processing speed and the precision are improved, and the method has better practicability; in the time domain expansion, the time domain is achieved by utilizing the Fourier transform, thereby an interpolation resampling operation is avoided, and the processing efficiency is improved. The invention sufficiently considers the characteristics of the TOPSAR working mode, overcomes the characteristic that the frequency domain and the time domain of the TOPSAR working mode are aliasing and has high efficiency.

Description

technical field [0001] The invention belongs to the field of signal processing, in particular to a spaceborne TOPSAR data imaging processing device and a processing method thereof. Background technique [0002] Synthetic Aperture Radar (SAR) satellites have developed rapidly in recent years. Since SAR satellites are not limited by factors such as weather, geography, and time, they can observe the earth all day long and have certain penetrating power, so they are widely used. It is used in military reconnaissance, resource detection, ocean observation, ecological monitoring, etc. [0003] As a kind of imaging radar for earth observation, spaceborne SAR has wide observation band and high resolution as an important direction of its development. In order to achieve a wide observation band, the traditional method is to use the scanning mode (ScanSAR mode). In the ScanSAR mode, the satellite completes the observation of different areas by switching the beam angle of view during t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/90
CPCG01S13/9056
Inventor 杨威李春升陈杰王鹏波
Owner BEIHANG UNIV
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