Image orthographic correction device of unmanned airborne SAR (Synthetic Aperture Radar)

Abstract

An image orthographic correction device of an unmanned airborne SAR (Synthetic Aperture Radar) is disclosed, comprising an aerial photograph DEM (Digital Elevation Model) data extraction module, an SAR image orthographic correction module and an orthographic image application module, wherein the aerial photograph DEM data extraction module extracts DEM data by an unmanned plane aerial photograph,then performs a photograph directional solution to realize the extraction of the DEM data, performs a gross error elimination on the DEM data, simultaneously performs a geometric correction on the aerial photograph, and conveys the corrected photograph, the data after the DEM gross error elimination and the SAR image corrected by the SAR image orthographic correction module into the orthographic image application module to realize image fusion processing; the SAR image orthographic correction module performs a directional parameter solution according to a polynomial SAR correction model basedon elevation correction and control point information, wherein the DEM data needs to be used as a basis during an orthographic correction process, and the data after the solution is output to the orthographic image application module after an orthographic correction precision analysis. The device disclosed by the invention has the advantages of strong technology pertinence, high solution reliability, high correction precision and high correction success rate.

Description

【Technical field】 [0001] The invention relates to unmanned aerial vehicle technology, in particular to an unmanned aerial vehicle-borne SAR image orthorectification device. 【Background technique】 [0002] Synthetic Aperture Radar (SAR) is an advanced radar detection system developed in the late 1960s. The United States was one of the first countries to develop such radars. Early prime aperture radars were installed on manned aircraft. At that time, the synthetic aperture radar had disadvantages such as low range resolution and weak real-time data processing capability. With the development of modern electronic technology, computer technology and aerospace technology, synthetic aperture radar technology has gradually matured, and it has changed from being installed on manned aircraft to being installed on various types of space such as unmanned aircraft and spacecraft. ) on the working platform. my country's synthetic aperture radar development work started in the mid-197...

AI Technical Summary

Problems solved by technology

[0005] Since SAR is a new UAV mission load, the current technology and equipment for processing SAR images are not perfect, and there is no method and equipment for orthorectification of UAV-borne SAR images.

[0006] (2) Existing technology and equipment cannot be applied

[0007] At present, manned airborne SAR image processing has a complete surveying and mapping support system, and manned aircraft has good flight stability, large imaging format, and easy selection and correction of basic information; unmanned aerial vehicles have poor flight stability, small imaging format, and no good surveying and mapping Guarantee, often the corrected basic information cannot be satisfied, resulting in manned airborne SAR image orthorectification equipment unable to meet the information processing needs of UAVs

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