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Azimuth parameter obtaining method for satellite-borne synthetic aperture radar in sliding bunching mode

A technology of synthetic aperture radar and sliding beamforming, which is applied in the direction of reflection/re-radiation of radio waves, utilization of re-radiation, measurement devices, etc., can solve the problems of large amount of calculation, complicated operation, long time consumption, etc., and avoid echo simulation. The effect of verifying the process with imaging processing, simplifying the design process, and improving the efficiency of engineering design

Active Publication Date: 2014-05-14
INST OF ELECTRONICS CHINESE ACAD OF SCI
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Problems solved by technology

[0009] In order to solve the defects of complex calculation, large amount of calculation, long time consumption and low efficiency in the prior art, the purpose of the present invention is to propose a design process for the length of the azimuth imaging band of the spaceborne sliding spotlight mode suitable for engineering applications, which can be used in the preliminary Avoid the process of echo simulation and imaging processing in the design of the scheme, and can ensure the reliability of the obtained parameter results and improve the efficiency of the obtained parameters

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  • Azimuth parameter obtaining method for satellite-borne synthetic aperture radar in sliding bunching mode
  • Azimuth parameter obtaining method for satellite-borne synthetic aperture radar in sliding bunching mode
  • Azimuth parameter obtaining method for satellite-borne synthetic aperture radar in sliding bunching mode

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Embodiment Construction

[0022] The following will combine additional figure 1 with figure 2 The present invention will be described in detail.

[0023] The basic principles of spaceborne SAR sliding spotlight mode are as follows figure 1 As shown, during a period of imaging time, the satellite flies along the orbit at a certain speed, and controls the azimuth to point to the beam center, so that the azimuth has a certain initial oblique angle of view ψ toward the beam center. start Start to rotate around the center of rotation, the oblique angle reaches the end oblique angle ψ end Time is over. In engineering, the rotation center point is a virtual point under the ground, and the slope distance corresponding to the rotation center is greater than the slope distance of the target point. On the ground, the beam center moves from left to right and slides through all the targets in the imaging area. , The thick black line in the middle of the figure is the imaging area. figure 1 The large solid dot in the...

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Abstract

The invention provides an azimuth parameter obtaining method for a satellite-borne synthetic aperture radar in a sliding bunching mode. An azimuth initial imaging belt length, an antenna beamwidth, an initial squint angle, a terminate squint angle and a target slant distance are utilized to establish a reference slant distance model corresponding to a beam rotation center; reference slant distance data are obtained, and an effective irradiation time model corresponding to a point target is established according to the reference slant distance data; effective initial irradiation time and effective terminate irradiation time of the point target are obtained, and an effective Doppler frequency and Doppler bandwidth model corresponding to the point target is established according to the effective initial irradiation time and effective terminate irradiation time of the point target; initial effective Doppler frequency, terminate effective Doppler frequency, the Doppler bandwidth and the resolution declining coefficient corresponding to the point target are obtained, an azimuth resolution model corresponding to the point target is established according to the initial effective Doppler frequency, terminate effective Doppler frequency, the Doppler bandwidth and the resolution declining coefficient corresponding to the point target, and the azimuth resolution corresponding to the point target is obtained; when the azimuth resolution is larger than a resolution index requirement, the maximum azimuth imaging belt length datum is output.

Description

Technical field [0001] The invention belongs to the field of spaceborne synthetic aperture radar imaging, and relates to a technology for acquiring system parameters of a spaceborne synthetic aperture radar (SAR). Background technique [0002] Spaceborne synthetic aperture radar sliding spotlight mode is the main mode for research and realization of high resolution and wide coverage spaceborne synthetic aperture radar imaging in recent years. In 2007, it obtained imaging application for the first time on the TerraSAR-X satellite in Germany, and obtained a large number of high resolution imaging applications. Quality spaceborne synthetic aperture radar images. However, TerraSAR-X due to the limited antenna azimuth scanning capability, its resolution and imaging band length index design is not high (1m×5km). By increasing the antenna scanning capability and the power supply capability of the satellite, the spaceborne synthetic aperture radar sliding aggregation The performance of ...

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Application Information

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IPC IPC(8): G01S13/90
CPCG01S7/4017G01S13/90G01S13/9047G01S13/9052
Inventor 吕继宇李海英王宇邓云凯
Owner INST OF ELECTRONICS CHINESE ACAD OF SCI
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