Polarization interference synthetic aperture radar three-dimensional imaging method based on polarization data amalgamation

An interferometric synthetic aperture and synthetic aperture radar technology, which is used in the reflection/re-radiation of radio waves, the use of re-radiation, measurement devices, etc. noise, etc.

Inactive Publication Date: 2009-02-18
TSINGHUA UNIV
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Problems solved by technology

Compared with the original phase of each polarization channel, the phase obtained by this algorithm has a certain improvement, but because the multi-view information is not considered, there is still a lot of noise in the phase, and the co

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  • Polarization interference synthetic aperture radar three-dimensional imaging method based on polarization data amalgamation
  • Polarization interference synthetic aperture radar three-dimensional imaging method based on polarization data amalgamation
  • Polarization interference synthetic aperture radar three-dimensional imaging method based on polarization data amalgamation

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Embodiment Construction

[0129] The present invention will be further described below in conjunction with accompanying drawing.

[0130] In order to verify the validity of the method, the present invention uses the L-band full-polarization single-view complex image data of the SIR-C / X-SAR radar system to verify the algorithm.

[0131] The data is an L-band fully polarized single-view complex image pair located in the Tianshan test area collected by the SIR-C / X-SAR radar system from October 8 to 9, 1994. The test area is located on the southeast shore of Lake Baikal in Russia, and contains different terrains, such as forests, crop fields, bare land and mountains. Before any preprocessing, the interferometric phase is seriously polluted by strong noise, resulting in a large number of residual points.

[0132] Figure 15 It is a schematic flow chart of the invention. In the example, the vegetation, bare land, and mountain land in the data are processed separately, and the universality and effectivenes...

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Abstract

Disclosed is a three-dimensional imaging method for a Polarimetric Interferometric Synthetic Aperture Radar (Pol-In-SAR) based on the polarimetric data integration, which belongs to the Polarimetric radar Interferometric measurement data processing technology field. The data is read in and two scattering vectors k1 and k2 are structured to each scattering unit; eigenvalue decomposition is performed on the matrix K1 K1-K2 K2 and three eigenvalues are obtained: Lambada1>0, Lambada1>0 and Lambada3=0; values of formula(1) can be respectively calculated so as to determine which condition the value belongs to; if in condition 1, w=w<(1)> can be calculated according to formula (6); if in condition 2, w=w<(2)> can be calculated according to formula (14); and then Phi[s]=arg(wk1k2w)can be calculated. An enhanced complex image can be obtained according to formula 3); the matrix Omega12=> is calculated; and then Phi[m]=arg(w[Omega12]w) can be calculated according to formula 22). The flat-earth effect is removed on the obtained whole phase map (single view or multi-view); and phase unwrapping is performed by using branch-cut algorithm. The invention has wide application range, and the calculating time is smaller than that of the interference optimization method; and the integrated phase quality is better than that of interference optimization method, the phase quality can be always enhanced despite the original signal level, thereby establishing a fine basis for generating accurate digital elevation model (DEM) in the future.

Description

technical field [0001] The invention relates to a polarization interference synthetic aperture radar phase enhancement and three-dimensional imaging method of a radar system. Background technique [0002] Synthetic Aperture Radar (SAR, hereinafter referred to as SAR) is an all-weather, all-time, high-resolution radar, which performs pulse compression and azimuth echo signal coherence on the chirp signal with a large time-bandwidth product through the distance upward Accumulate two-dimensional high-resolution images. [0003] When the radar platform at the flight height H flies along a straight line, it emits beams towards the positive side of the flight direction, as shown in the attached figure 1 As shown, the main lobe of the beam covers a certain area on the ground. With the movement of the platform, a surveying strip will be formed. Define the flying direction of the radar platform as the azimuth direction, and the direction perpendicular to it is the distance direction...

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Application Information

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IPC IPC(8): G01S13/90
Inventor 杨健熊涛张卫杰周广益
Owner TSINGHUA UNIV
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