Large-angle oblique imaging aerocamera targeted target positioning method

Abstract

The invention discloses a large-angle oblique imaging aero-camera targeted target positioning method. In accordance with the problems that the shooting distance of a large-angle oblique imaging aero-camera is long, and the operating distance of laser distance measuring equipment is limited, and the invention provides a direct targeted target positioning algorithm which is independent of the distance measuring equipment. According to the position and the attitude information of a carrying aerial vehicle, measured by the carrying aerial vehicle POS ( position and orientation system) and frame angular position information measured by a position encoder in the aero-camera; a homogeneous coordinate conversion method is used for solving the direction of a target under a geodetic coordinate system; and an earth ellipsoid model and a digital elevation model are used for determining latitude and longitude information of the target point. According to the large-angle oblique imaging aero-camera targeted target positioning method disclosed by the invention, flight test data is used for verifying the validity of the target positioning algorithm; and when the flight height is 18000m, and the rolling angle of a shooting frame is smaller than 63 degrees, the target positioning circular probable error is smaller than 70m, so that engineering actual requirements can be met.

Description

technical field [0001] The invention belongs to the technical field of aerial imaging and measurement and control, and in particular relates to a ground target positioning method for a large-angle oblique imaging aerial camera. Background technique [0002] In addition to high-resolution imaging, the aerial camera also needs to perform high-precision positioning of the target at the same time. At present, most target positioning algorithms are based on distance measurement, and the distance value of the target relative to the airborne optoelectronic equipment needs to be given by the target ranging equipment. The positioning accuracy is better than 15m and 20m respectively; however, when the aerial camera is flying at an altitude of 18,000m and obliquely imaging a target 50km away, the small laser ranging device cannot meet the distance requirements, and the large laser ranging is limited by its size and cannot be used in the aviation field. , At the same time, long-distanc...

AI Technical Summary

Problems solved by technology

At present, most target positioning algorithms are based on distance measurement, and the distance value of the target relative to the airborne optoelectronic equipment needs to be given by the target ranging equipment. The positioning accuracy is better than 15m and 20m respectively; however, when the aerial camera is flying at an altitude of 18,000m and obliquely imaging a target 50km away, the small laser ranging device cannot meet the distance requirements, and the large laser ranging is limited by its size and cannot be used in the aviation field. At the same time, long-distance laser ranging will also be affected by various factors such as the atmosphere, resulting in a decrease in ranging accuracy, thereby affecting the positioning of the target

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