InSAR multi-baseline phase unwrapping method

A phase unwrapping, multi-baseline technology, applied in the field of interferometric synthetic aperture radar, can solve the problems of low algorithm execution efficiency and easy to be interfered by noise, and achieve the effect of improving the expression form, improving the calculation efficiency and improving the efficiency.

Pending Publication Date: 2022-04-19
NO 54 INST OF CHINA ELECTRONICS SCI & TECH GRP
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Problems solved by technology

However, the current multi-baseline phase unwrapping technology still has problems such as low algorithm execution efficiency and susceptibility to noise interference.

Method used

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  • InSAR multi-baseline phase unwrapping method

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Embodiment Construction

[0046] The present invention will be further described below in conjunction with the accompanying drawings.

[0047] An InSAR multi-baseline phase unwrapping method, which is based on Markov random field and mixed integer quadratic programming, can recover the absolute phase from the interferogram wrapped phase.

[0048] Suppose there are n interferograms: The size of the interferogram is M×N, and the corresponding vertical baseline lengths are: B 1 ,B 2 ,...B n , to solve for the unwrapped phase: φ 1 ,φ 2 ,...,φ n .

[0049] Such as figure 1 As shown, the steps of this method are:

[0050] (1) According to the InSAR observation geometric model, the winding phase of the i-th interferogram Ambiguity k i , vertical baseline B i The relationship with terrain height h is as follows:

[0051]

[0052] Where λ represents the wavelength, R represents the distance from the antenna phase center to the ground target point, θ represents the antenna incident angle, and th...

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Abstract

The invention discloses an InSAR (Interferometric Synthetic Aperture Radar) multi-baseline phase unwrapping method, and belongs to the technical field of interferometric synthetic aperture radars. According to the method, an optimization model of phase gradient ambiguity is established by using 2-norm constraint, and a solving problem is converted into a mixed integer quadratic programming problem; the energy function expression form of the Markov random field model is improved, so that the model is converted into a quadratic programming problem to simplify the solving process. Through the method provided by the invention, the execution efficiency and the solving precision of InSAR multi-baseline phase unwrapping can be effectively improved, the solving result has the characteristics of certainty and uniqueness, and the execution time is controllable under the given precision.

Description

technical field [0001] The present invention relates to the technical field of Interferometric Synthetic Aperture Radar (InSAR), in particular to an InSAR multi-baseline phase unwrapping method. Background technique [0002] InSAR processing can extract high-precision, large-scale digital surface model (Digital Surface Model, DSM) on the ground, which plays an irreplaceable role in surveying and mapping applications. Phase unwrapping is the key core step of InSAR processing. Since the interferometric phase obtained by InSAR data is entangled, that is, between -π and π, it is necessary to perform phase unwrapping operation to restore the phase to the absolute phase before subsequent Surface elevation inversion and other processing. [0003] Phase unwrapping can be divided into single-baseline phase unwrapping technology and multi-baseline phase unwrapping technology. The single-baseline phase unwrapping technology performs phase unwrapping through an interferogram, mainly i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/90G06F17/11
CPCG01S13/9023G06F17/11
Inventor 薛飞扬单子力薛辉梁硕孙康
Owner NO 54 INST OF CHINA ELECTRONICS SCI & TECH GRP
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