SAR (Synthetic Aperture Radar) Doppler fuzzy number estimation method based on optimal image quality

A technology of Doppler blur and image quality, applied in the field of SAR Doppler blur number estimation, which can solve the problems of large error and low precision.

Inactive Publication Date: 2012-06-27
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

[0005] The purpose of the present invention is to overcome the defects of the prior art, solve the problem that the traditional SAR Doppler fuzzy number estimation method is used in low-contrast and high-contrast scenes at the same time, with large errors and low precision, and proposes a method based on optimal image quality SAR Doppler Fuzzy Number Estimation Method

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  • SAR (Synthetic Aperture Radar) Doppler fuzzy number estimation method based on optimal image quality
  • SAR (Synthetic Aperture Radar) Doppler fuzzy number estimation method based on optimal image quality
  • SAR (Synthetic Aperture Radar) Doppler fuzzy number estimation method based on optimal image quality

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[0042] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0043] A SAR Doppler fuzzy number estimation method based on optimal image quality. The observation scenes are farmland and towns, with both low-contrast and high-contrast scenes. The implementation process is as follows: figure 1 As shown, the specific steps are:

[0044] Step 1. Obtain the SAR echo data after the distance compression according to the target synthetic aperture time length, and use the time domain correlation method to obtain the estimated value of the fractional part of the Doppler center according to the formula (1), and use f dc_base express.

[0045] f dc _ base = 1 N r Σ m = 1 N ...

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Abstract

The invention relates to a SAR (Synthetic Aperture Radar) Doppler fuzzy number estimation method based on optimal image quality and belongs to the technical field of SAR imaging. In the invention, by utilizing a functional relation between image quality and Doppler fuzzy number estimation bias, a corresponding Doppler fuzzy number is taken as an estimated value of an SAR Doppler fuzzy number whenthe image quality is optimal. The invention adopts the SAR Doppler fuzzy number estimation method based on the optimal image quality; and as the image quality of a SAR is very sensitive to the Doppler fuzzy number estimation error, and a quantitative relationship between the image quality and the Doppler fuzzy number is fully utilized in the method, the low-contrast and high-contrast scenes have higher estimated accuracy.

Description

technical field [0001] The invention relates to a SAR (Synthetic Aperture Radar) Doppler fuzzy number estimation method based on optimal image quality, which belongs to the technical field of SAR imaging. Background technique [0002] In SAR imaging processing, the Doppler center is an extremely important imaging parameter. Since the azimuth echo data is sampled according to the pulse repetition frequency, the Doppler center includes two parts: the baseband Doppler center (the Doppler center decimal part) and the Doppler ambiguity number (the integer part of the Doppler center); if there is a deviation in the Doppler ambiguity number, it will cause the image signal-to-noise ratio to deteriorate and directly affect the image quality; usually, the Doppler ambiguity number can be determined by The platform motion and antenna attitude parameters are calculated, but due to the limited accuracy of the measurement unit, the calculated value deviates greatly from the real value, so ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/90G01S7/41
Inventor 丁泽刚曾涛吕争刘荦锶陈亮
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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