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Baseline estimation method of spaceborne interference synthetic aperture radar based on half-Newton iteration method

A technique of interferometric synthetic aperture and baseline estimation, which is applied in the field of signal processing and can solve problems such as limitations

Inactive Publication Date: 2010-11-17
BEIHANG UNIV
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Problems solved by technology

Methods for baseline estimation using the wrapped phase of the interferogram are thus limited

Method used

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  • Baseline estimation method of spaceborne interference synthetic aperture radar based on half-Newton iteration method
  • Baseline estimation method of spaceborne interference synthetic aperture radar based on half-Newton iteration method
  • Baseline estimation method of spaceborne interference synthetic aperture radar based on half-Newton iteration method

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Embodiment Construction

[0072] Next, the validity of the half-Newton iterative method for estimating the baseline is verified by using the interferometric complex image data obtained from the specific sending and receiving spaceborne InSAR parameters.

[0073] Table 1 gives the main spaceborne InSAR parameters:

[0074] Table 1

[0075] InSAR parameters

value

Main star height H

514km

Signal wavelength λ

0.031m

pulse repetition frequency

150MHZ

Lower viewing angle θ

40°

Baseline length B

200m

Baseline inclination α

45°

distance to pixel spacing

1.0m

Slope distance R at beam center 0

670979.346m

[0076] Try to select a flat area on the ground, and use the spaceborne InSAR parameters to obtain the corresponding interferometric complex image data.

[0077] Select complex data in a certain distance range on the complex image, let the slope distance r min is 670487.346 meters, r max is 67...

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Abstract

The invention relates to a baseline estimation method of a spaceborne interference synthetic aperture radar based on a half-Newton iteration method. In the method, the frequency range is not directly acquired by using a distance-direction frequency spectrogram of an interference complex image, distance-direction interference fringe frequency corresponding to each pixel point in the interference complex image is firstly acquired, and interference complex data in the certain distance-direction range correspond to the frequency in a certain range, thereby the required frequency value can be obtained. The range value of the frequency can be precisely estimated by utilizing the half-Newton iteration method and then baseline parameters can be precisely calculated by combining an equation set; and by adopting the method of the invention, the precision of the baseline length can reach the centimeter grade, and the precision of estimating the baseline by utilizing the interference complex image can be greatly improved, thereby the precision of the final digital elevation is greatly improved.

Description

technical field [0001] The invention relates to a method for estimating a base line of a spaceborne interferometric synthetic aperture radar (InSAR), belonging to the technical field of signal processing. Background technique [0002] Spaceborne Interferometric Synthetic Aperture Radar (InSAR) is developed on the basis of Synthetic Aperture Radar. It uses the phase information extracted from the complex data of Synthetic Aperture Radar as the information source to obtain the three-dimensional information and change information of the earth's surface. It has the characteristics of obtaining large-area digital elevation maps all-day and all-weather. InSAR uses two antennas to acquire a pair of complex radar images in the same area. The two images are precisely registered and multiplied by complex conjugates to obtain an interference image. The phase difference in the interference image is the phase difference measurement value of the two imaging , according to the geometric r...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/90
Inventor 徐华平朱玲凤冯亮
Owner BEIHANG UNIV