Method for automatically selecting ground control points during interference measurement of synthetic aperture radar

A technology of synthetic aperture radar and ground control point, which is applied in the field of surveying and mapping and remote sensing information application, and can solve the problems of heavy workload of human-computer interaction

Active Publication Date: 2018-08-10
NANJING NORMAL UNIVERSITY
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  • Abstract
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Problems solved by technology

However, this kind of manual interactive selection of GCP in SAR images or interferograms not only requires a large amount of human-computer interaction, but also depends on the experience of the processing personnel in the point selection process, which is highly subjective and has a great impact on the processing results. negative effect

Method used

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  • Method for automatically selecting ground control points during interference measurement of synthetic aperture radar
  • Method for automatically selecting ground control points during interference measurement of synthetic aperture radar
  • Method for automatically selecting ground control points during interference measurement of synthetic aperture radar

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Embodiment

[0046] In this embodiment, the multi-temporal SAR SLC image sequence (the present invention is also suitable for SAR SLC images acquired by other satellites) acquired by the Italian COSMO SkyMed satellite and covering part of the Hengduan Mountains is used for multi-time series InSAR analysis (SBAS-InSAR mode) acquisition When the regional surface is deformed, the need for GCP in the de-flattening effect, satellite orbit parameter correction and re-de-leveling, slant distance-ground distance conversion, geocoding and other links is taken as an example.

[0047] Such as figure 1 As shown, the automatic selection method of ground control points in the SAR interferometry implemented in this implementation, the process is as follows:

[0048] Step 1, image preprocessing and calculation of interferometric phase and coherence coefficient

[0049] From the multi-time series COSMO SkyMed SAR SLC (or other satellite SAR SLC images) image sequence that repeatedly covers the same area, ...

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Abstract

The invention discloses a method for automatically selecting ground control points during the interference measurement of a synthetic aperture radar. The method comprises the steps of randomly selecting two images in a multi-time-sequence SAR SLC image sequence to be subjected to interference measurement to form an interference pair, obtaining an interference graph through interference phase calculation, and calculating a coherence coefficient graph; segmenting the interference graph according to the number of required GCPs, figuring out an interference phase derivative of each pixel in the interference pair, carrying out statistics on the variance of all interference phase derivatives in each pixel local window, and searching a region in each block to form a candidate subset S1 of GCPs, wherein all searched regions are stable in interference phase or continuously and uniformly changing in interference phase; on the basis of the coherence coefficient graph, screening out pixels high inboth own coherence coefficient and coherence coefficient in the pixel local window, and forming a candidate subset S2 of GCPs; obtaining the intersection set of the candidate subset S1 and the candidate subset S2 of GCPs and obtaining a preliminary GCP selection result; optimizing the preliminary GCP selection result according to the number and the distribution of GCPs, and obtaining a final GCPselection result of GCPs. According to the invention, the method has an important value for improving the automation degree and the precision of the radar interference measurement of different modes.

Description

technical field [0001] The invention belongs to surveying and mapping and remote sensing information application technology, in particular to a method for automatically selecting ground control points in synthetic aperture radar interferometry. Background technique [0002] Synthetic Aperture Radar Interferometry (InSAR) measurement is a newly developed space-to-earth observation technology, and it is the product of the combination of Synthetic Aperture Radar (SAR) remote sensing technology and radio astronomy interferometry technology. It uses two airborne or spaceborne SAR antennas with interferometric imaging capabilities (or one antenna for multiple time-series repeated observations) to transmit microwave signals to the target area, and then the synthetic aperture radar receives the echoes reflected by the target, and obtains the same target area. Two or more coherent single-looking complex (Single Looking Complex, SLC) (including amplitude and phase information) images ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/90
CPCG01S13/90G01S13/9023
Inventor 盛业华周良辰张棫张卡
Owner NANJING NORMAL UNIVERSITY
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