Abstract
The Position and Orientation System (POS) is the core device of high-resolution aerial remote sensing systems, which can obtain the real-time object position and collect target attitude information. The goal of exceeding 0.015°/0.003° of its real-time heading/attitude measurement accuracy is unlikely to be achieved without gravity disturbance compensation. In this paper, a high-precision gravity data architecture for gravity disturbance compensation technology is proposed, and a gravity database with accuracy better than 1 mGal is constructed in the test area. Based on the “Block-Time Variation” Markov Model (B-TV-MM), a gravity disturbance compensation device is developed. The gravity disturbance compensation technology is applied to POS products for the first time, and is applied in the field of aerial remote sensing. Flight test results show that the heading accuracy and attitude accuracy of POS products are improved by at least 6% and 16%, respectively. The device can be used for the gravity disturbance compensation of various inertial technology products.
Highlights
The Position and Orientation System (POS) is the core equipment of high-resolution aerial ground observation systems
In order to verify the effect of the gravity compensation method, the data of the operation area of the flight path are mainly selected
POS is a typical SINS/Global Navigation Satellite System (GNSS) combined measurement system whose attitude accuracy mainly depends on SINS
Summary
The Position and Orientation System (POS) is the core equipment of high-resolution aerial ground observation systems. It can seen from Formula (1) that the effect of gravity disturbance on the output of inertial measurement is mainly highlighted in the horizontal component, which mainly affects the attitude. Since the current inertial products (POS or high-precision INS) have mature hardware and the research on gravity disturbance compensation technology is still in its infancy, the development of the gravity disturbance compensation device is carried out with the main purpose to make the gravity disturbance compensation technology independent of the inertial products, achieving improvement in the position and attitude measurement accuracy of the original inertial products without any change for the inherent structure of original products, and promising normal operation and the inherent accuracy of original products when faced with device failure.
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