A SAR Baseline Calibration Method for Surveying and Mapping Without Control Points

Abstract

The invention provides a non-control point surveying and mapping SAR baseline calibration method. According to the method, for a characteristic that a surveying and mapping SAR difficultly obtains anelevation control point, a function model of an interference phase of a reference target region and a baseline vector is built, elevation information of the target region is set as an unknown quantityinterval to perform traversal estimation, and then a baseline estimation result is screened based on a mean square error minimum criterion, so that high-precision baseline estimation under the condition of no control point is achieved. The method comprises the two parts including extended Kalman filter (EKF)-based baseline parameter estimation and mean square error minimum criterion-based baseline parameter selection. The method does not depend on ground control point information, solves the problem that the surveying and mapping SAR difficultly obtains the elevation control point, and is good in algorithm robustness and high in practicability.

Description

technical field [0001] The invention relates to a SAR baseline calibration method for surveying and mapping without control points, and belongs to the technical field of synthetic aperture radar (SAR) data processing. Background technique [0002] Spaceborne synthetic aperture radar (SAR), as an important means of high-resolution microwave remote sensing for earth observation, has received more and more attention in recent years. SAR has all-day and all-weather working capabilities, and can obtain high-resolution images of targets in multi-band and multi-polarization modes, so it is widely used in terrain mapping, ocean monitoring, disaster reduction and prevention, agriculture, forestry, and military reconnaissance. play an important role. [0003] There is a permanent shadow area in Antarctica, and the terrain has large fluctuations. The optical mapping system is limited by the lighting conditions and cannot meet the needs of topographic mapping in the shadow area. It is ...

AI Technical Summary

Problems solved by technology

[0005] The technical problem of the present invention is to overcome the deficiency that the existing baseline calibration method requires ground control points, and provides a SAR baseline calibration method for surveying and mapping without control points. This method only requires the reference area to be a flat area, and does not need to accurately know the reference area It can effectively solve the problem that it is difficult to obtain elevation control points for surveying and mapping SAR, and the algorithm has good robustness and strong practicability.

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