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A multi-baseline phase estimation device and method based on likelihood estimation

A technology of phase estimation and likelihood estimation, which is applied in the direction of measuring devices, radio wave measurement systems, radio wave reflection/reradiation, etc., to achieve the effects of simplifying complexity, increasing accuracy and robustness, and reducing the number of uses

Active Publication Date: 2022-04-29
BEIHANG UNIV
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  • Application Information

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Problems solved by technology

The unwrapped phase can be estimated directly from the filtered wrapped phase

Method used

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  • A multi-baseline phase estimation device and method based on likelihood estimation
  • A multi-baseline phase estimation device and method based on likelihood estimation
  • A multi-baseline phase estimation device and method based on likelihood estimation

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Experimental program
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Embodiment

[0079] according to figure 2 The imaging geometry is shown, and the complex image simulation is performed on the double-baseline interferometry system. The simulation parameters are shown in Table 1. The simulated SAR main image such as image 3 shown.

[0080] Table 1 Radar parameters

[0081]

[0082]The main and auxiliary images of the long and short baselines are registered respectively, and the arguments are multiplied by conjugates to obtain the long and short baseline interferometric phases as Figure 4 , Figure 5 shown.

[0083] The short-baseline flat-earth phase is estimated by the frequency-domain method, and the reference baseline (long baseline) flat-earth phase is obtained according to the baseline ratio. Long and short baseline flat-Earth phases such as Figure 6 , Figure 7 shown.

[0084] The long and short baseline winding phase removes the flat ground phase and rewinds to the main value interval, and uses the slope adaptive filtering algorithm t...

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Abstract

The invention provides a multi-baseline phase estimation device and method based on likelihood estimation, which uses a normalized probability density function to expand or compress periods of different baseline interference phase probability density functions. The unwrapped phase can be directly estimated from the filtered wrapped phase. Compared with the single baseline algorithm, the invention can make full use of multiple sets of baseline data and suppress unwrapping errors caused by noise. Compared with the traditional multi-baseline fusion algorithm, the input of the invention in the fusion stage is the filtered phase, which reduces the influence of phase noise and improves the accuracy of phase estimation; the speed of phase estimation is greatly improved by using the search interval. Compared with the traditional de-planar algorithm, the de-planar algorithm in this invention does not require satellite orbit parameters and control point information, and quickly obtains the phases of different baseline reference planes through the frequency domain method and baseline ratio, which greatly improves the phase ratio without changing the phase ratio. Reduce the absolute value of the unwrapping phase and reduce the unwrapping error caused by the baseline scale error during fusion.

Description

technical field [0001] The invention belongs to the field of remote sensing imaging processing, in particular to a multi-baseline phase estimation device and method based on likelihood estimation. Specifically, the phase normalization operation is used to expand the period of the probability density function of different baseline phases, and the absolute phase is estimated by the principle of likelihood estimation. Background technique [0002] Interferometric Synthetic Aperture Radar (InSAR) is one of the powerful means to obtain terrain elevation and deformation in a wide range under all-weather and all-weather conditions. Can quickly obtain high-precision digital elevation model (Digital Elevation Model, DEM) data. In civil and basic scientific fields such as surface deformation detection, moving target detection, ocean mapping, forest mapping, flood detection, traffic monitoring and glacier research, InSAR technology also has extremely important application and research...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/90
CPCG01S13/9023G01S13/9058
Inventor 徐华平李硕王鹏博高帅尤亚楠李春升
Owner BEIHANG UNIV