Multi-baseline/multi-frequency-band interference phase unwrapping frequency domain quick algorithm

A technology of phase unwrapping and interferometric phase diagram, which is applied in the field of fast frequency domain and interferometric phase unwrapping, which can solve the problems of low efficiency and achieve the effect of reducing calculation amount and maintaining calculation accuracy

Inactive Publication Date: 2012-08-01
NAT UNIV OF DEFENSE TECH
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Problems solved by technology

[0004] At present, the multi-baseline/multi-band phase unwrapping methods mainly include: Chinese remainder law method, projection method and linear combination method, iterative method, time domain least square method, Kalman filter method, maximum likelihood method, maximum a posteriori method, space- Image domain joint subspace orthogonal projection method and network flow method, among wh

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  • Multi-baseline/multi-frequency-band interference phase unwrapping frequency domain quick algorithm
  • Multi-baseline/multi-frequency-band interference phase unwrapping frequency domain quick algorithm
  • Multi-baseline/multi-frequency-band interference phase unwrapping frequency domain quick algorithm

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[0045] figure 1 It is a schematic flow chart of a fast frequency domain algorithm for multi-baseline phase unwrapping provided by the present invention. The whole process is divided into four steps. The first step is to calculate the phase gradient value of the interferometric phase map; this step includes two steps of calculating the phase gradient value on the non-boundary and calculating the phase gradient value on the boundary, and the phase gradient field with the boundary satisfying the condition of no rotation can be obtained. The second step is the calculation of the approximate value of the Fourier coefficient; based on the phase gradient field established in the first step, the Fourier coefficient is calculated by the least square method to obtain the approximate value of the Fourier coefficient that satisfies the unrotating condition. The third step is the calculation of the phase gradient estimation value; this step uses the Fourier coefficient estimation value in t...

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Abstract

The invention provides a multi-baseline/multi-frequency-band phase unwrapping frequency domain quick algorithm. The technical scheme includes that firstly, calculating phase gradient values in the horizontal and vertical directions according to interference phase observed values of an interference phase diagram, and calculating phase gradient values on the border of a phase gradient diagram according to time domain irrotational conditions; secondly, subjecting the phase gradient values to Fourier transform to obtain a frequency domain function of the phase gradient values, and calculating a Fourier coefficient approximate value meeting the irrotational conditions under the condition that the quadratic sum of the weighted sum of and the difference between the frequency domain function of phase gradient estimated values and a frequency domain function of each baseline/each frequency band phase gradient values; thirdly, subjecting the Fourier coefficient approximate value to Fourier transform to obtain a phase gradient estimated value meeting the phase irrotational conditions; and fourthly, integrating the obtained phase gradient estimated value meeting the phase irrotational conditions to obtain a phase unwrapping value. Calculation amount of the phase unwrapping algorithm is reduced while precision is unaffected.

Description

technical field [0001] The invention belongs to the intersecting technical field of remote sensing and signal processing, in particular to a frequency-domain fast method for interferometric phase unwrapping under multi-baseline / multi-frequency band conditions by using interferometric synthetic aperture radar. Background technique [0002] All the process of restoring the phase from the main value or the phase difference value to the real value are collectively called phase unwrapping. In addition to the application of interferometric synthetic aperture radar, phase unwrapping is widely used in synthetic aperture sonar, adaptive optics, nuclear magnetic resonance, seismic processing, etc. have important applications. Using multiple interferometric synthetic aperture radars to form multi-baseline or multi-band interference can improve the performance of phase unwrapping. [0003] The present invention takes the application of interferometric synthetic aperture radar as an exa...

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Application Information

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IPC IPC(8): G01S13/90
Inventor 黄海风张永胜王青松何志华孙造宇金光虎董臻余安喜何峰杜湘瑜陈祺
Owner NAT UNIV OF DEFENSE TECH
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