Online quick method for improving accuracy of attitude determination of airborne platform

Abstract

The invention discloses an online quick method for improving the accuracy of attitude determination of an airborne platform. Under the condition of selecting low-cost and low-accuracy INS (Inertial Navigation System) equipment, the method can online correct low-accuracy INS attitude determination data by implementing that variation of attitude angles of the platform can be calculated by relative motion of two adjacent aerial images in a central processing unit of the airborne platform, so that the attitude determination accuracy of the airborne platform can be quickly improved in an online manner. The method is characterized in that the relative motion of the two adjacent aerial images can be calculated by an image matching algorithm; the attitude angle variation of the platform can be calculated by establishing a mapping relationship between variation of the attitude angle of the airborne platform and the relative motion of the aerial images; and the low-accuracy INS attitude determination data can be corrected online by using the calculated variation of the attitude angle so as to online improve the attitude determination accuracy of the airborne platform. The method can reduce system cost, online correct the measurement errors of the INS attitude angles with frequency higher than 20Hz, and is applicable to situations that the attitude of the airborne platform varies frequently in aerial remote sensing application.

Description

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

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 quality and storage capacity of storage devices, which makes the aerial photography cycle of aerial photography images not too small

In the case of data post-processing, too small aerial photography period will lead to a rapid increase in the amount of data, which not only greatly increases the demand for storage capacity of storage devices, but also increases the difficulty of data processing, which is not conducive to the accuracy of airborne remote sensing images. Get it in time

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