Method for improving attitude determination precision of airborne laser radar

Abstract

The invention discloses a method for improving attitude determination precision of an airborne laser radar by solving three attitude angle errors through two-dimensional coordinate errors of feature points on a geodetic coordinate system under the condition of selecting an INS with low cost and low precision. The method is characterized in that the method combines three-dimensional initial correction coordinates of GPS positioning data, INS attitude determination data, laser distance measurement data, scanning angle data and other feature points on the geodetic coordinate system, solves the attitude angle errors by differences between the initial correction coordinates of the feature points in the two-dimensional direction of the geodetic coordinate system and real coordinates according to the mapping relation between the coordinate errors of laser footprints on the geodetic coordinate system and the attitude angle errors, and utilizes the solved attitude angle errors to amend the INS attitude data with low precision, thereby improving the attitude determination precision of the airborne laser radar. The method can greatly reduce system cost and amend the attitude angle errors with high frequency, thereby being applicable to the situations of platform attitude frequent change in light and small aerial remote sensing applications.

Description

technical field [0001] The invention relates to the field of remote sensing and earth observation, and mainly relates to a method for improving the attitude determination accuracy of an airborne laser radar. Background technique [0002] Airborne lidar is widely used in terrain surveying and mapping, ocean bathymetry, atmospheric environment monitoring, ecosystem measurement, military and national defense due to its advantages of all-weather work, flexible operation, low cost, convenient operation, high operation efficiency, and short mapping cycle. and other fields. [0003] With the development of Global Positioning System (Global Position System, GPS), Inertial Navigation System (Inertial Navigation System, INS), and laser ranging technology, the positioning accuracy and imaging accuracy of airborne lidar have been greatly improved. In particular, the application of differential GPS technology has improved the positioning accuracy of GPS from meter level to centimeter le...

AI Technical Summary

Problems solved by technology

On the other hand, the limitation of the load capacity of light and small aircraft also limits the storage capacity of the storage device, which makes the aerial photography cycle of aerial photography images not too small

At the same time, a too small aerial photography period will lead to a rapid increase in the amount of data processing, which not only increases the difficulty of data processing, but also is not conducive to the timely acquisition of lidar remote sensing images.

Images