A real-time positioning method without control points in airborne SAR images adapted to complex terrain

Abstract

The invention relates to a method for real-time positioning of airborne SAR images without control points adapted to complex terrain, comprising the following steps: Step 1. Calculate the memory address corresponding to the center of the target through the mouse click position, and obtain the SAR corresponding to the target through the memory address Auxiliary data; Step 2, resolve aircraft position, imaging track angle, image close range, image sampling interval, side-view direction parameter from SAR auxiliary data; Described aircraft position comprises longitude, latitude, height; Step 3, by image Sampling interval, image close range, aircraft height, imaging area elevation parameters, using SAR imaging geometry to calculate the distance from the target to the sub-machine point; step 4, calculate the azimuth of the target relative to the sub-machine point; step 5, known the longitude and latitude of the sub-machine point , the distance from the target to the off-camera point, the azimuth of the target relative to the off-camera point, and the longitude and latitude of the target point are obtained by using the geodetic thematic forward calculation formula and iterative optimization algorithm; step 6, based on the DEM data, iteratively solve to obtain the final longitude and latitude value of the target point .

Description

technical field [0001] The invention relates to the technical field of airborne Synthetic Aperture Radar (SAR) image positioning, in particular to a real-time geographic positioning method for UAV-borne SAR images without control points for complex terrain in plateau areas. The present invention can perform high-precision geographic positioning without control points on the SAR image data downloaded in real time by the communication link of the UAV, and the method described in the present invention is also applicable to manned airborne SAR. Background technique [0002] The UAV aerial remote sensing platform has the characteristics of long battery life, real-time image transmission, detection of high-risk areas, low cost, and strong mobility. Therefore, it has become a powerful supplement to satellite remote sensing and manned aerial remote sensing. Synthetic Aperture Radar (SAR) has the characteristics of all-weather and all-weather work, and has good detection and resoluti...

AI Technical Summary

Problems solved by technology

[0009] The purpose of the invention is to solve the problem of real-time high-precision positioning of UAV-borne SAR images with complex terrain in plateau mountainous areas

The present invention aims at the SAR image data stream downloaded in real time by the UAV communication link, and solves the following problems: (1) perform target geographic positioning in the process of image real-time display; precision target positioning

Images