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Phase unwrapping algorithm based on modified embedded cubature Kalman filtering (MECKF)

A technology of Kalman filter and Kalman filter, which is applied in radio wave reflection/re-radiation, radio wave measurement system, utilization of re-radiation, etc., can solve the problem that the accuracy of phase unwrapping needs to be further improved

Active Publication Date: 2017-07-07
GUILIN UNIV OF ELECTRONIC TECH
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Problems solved by technology

This type of algorithm takes advantage of its own ability to suppress noise, and can suppress phase noise while unfolding the winding pixels, which makes up for the shortcomings of traditional phase unwrapping algorithms using pre-filters to a certain extent, but its phase unwrapping accuracy needs to be further improved

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  • Phase unwrapping algorithm based on modified embedded cubature Kalman filtering (MECKF)
  • Phase unwrapping algorithm based on modified embedded cubature Kalman filtering (MECKF)
  • Phase unwrapping algorithm based on modified embedded cubature Kalman filtering (MECKF)

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Embodiment Construction

[0069] The present invention will be further described below in conjunction with the accompanying drawings.

[0070] In order to verify the performance of the phase unwrapping algorithm based on the modified embedded volumetric Kalman filter (MECKFPU), the phase unwrapping algorithm based on the modified embedded volumetric Kalman filter (MECKFPU) and the quality map guidance method were used in the simulation data experiment and the measured data experiment , Extended Kalman Filter Phase Unwrapping Algorithm (EKFPU) and Insensitive Kalman Filter Phase Unwrapping Algorithm (UKFPU) for comparison. It should be noted that the simulation data experiment and the measured data experiment are all under the same MATLAB computing environment; the local phase gradient estimation algorithm based on the modified matrix beam model (AMPM) uses a local window size of 7×7; in this experiment, The estimated error variance of the initial expanded pixel based on the modified embedded volumetric...

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Abstract

The invention discloses a phase unwrapping algorithm based on MECKF. According to the algorithm, an embedded cubature Kalman filter modified via a Levenberg-Marquardt method, a local phase gradient estimation algorithm based on a corrected matrix beam model (AMPM) and a quantified tracking strategy are combined to unwrap a wound phase image accurately in high efficiency. The algorithm comprises the main steps that a recursion state estimation model of the phase unwrapping algorithm based on MECKF is established, and the phase gradient estimation method based on the AMPM is used to obtain phase gradient information needed by the recursion state estimation model; and the quantified path guiding graph strategy, the recursion state estimation model of the phase unwrapping algorithm based on MECKF is guided to unwrap wound pixels rapidly along a path from a high-quality area to a low-quality area till phases of all wound pixels are unwrapped. The algorithm is characterized by higher precision and robustness.

Description

technical field [0001] The invention relates to the field of interferometric phase unwrapping algorithms in the measurement application of Interferometric Synthetic Aperture Radar (InSAR), in particular to a phase unwrapping algorithm based on a modified embedded volume Kalman filter. Background technique [0002] Interferometric synthetic aperture radar (InSAR) can obtain three-dimensional surface information and elevation change information with high precision and high reliability, and is widely used in land surveying and mapping, ocean monitoring, volcano monitoring and earthquake detection and other fields. Interferometric phase unwrapping is a particularly critical link in the application of Interferometric Synthetic Aperture Radar (lnSAR) technology, and its phase unwrapping accuracy directly affects the elevation measurement accuracy of Interferometric Synthetic Aperture Radar (InSAR) system, so the issue of interferogram unwrapping has received more and more attention...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/90
CPCG01S13/9023
Inventor 谢先明代高兴
Owner GUILIN UNIV OF ELECTRONIC TECH
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