Abstract
With the development of science and technology, position and orientation system (POS) technology has become an important tool for airborne earth observation system, and plays an important role in both military and civil fields. The calibration of the device directly affects the accuracy of inertial navigation. Therefore, the paper designs a compact dual mode navigation system with high and low precision, which can be used in distributed POS system. Firstly, the status of IMU calibration technology is introduced. Then it introduces the working principle, structure design and layout design of fiber optic gyroscope (FOG) combination. Finally, the calibration experiment verifies that the designed FOG combination system meets the performance index.
Highlights
Airborne earth observation system is a kind of high-precision technical means to obtain space information with aircraft as observation platform, and it is an important means of military surveying and mapping and investigation
Distributed position and orientation system (POS) technology mainly consists of high-precision master POS and multiple small-sized IMU fixed on the task load
The transfer alignment filtering estimation of multiple sub IMU distributed on the flexible baseline is carried out by using the high-precision spatiotemporal measurement information from the main POS, so as to realize the accurate measurement of the flexible baseline multi node spatiotemporal reference [1-2]
Summary
Airborne earth observation system is a kind of high-precision technical means to obtain space information with aircraft as observation platform, and it is an important means of military surveying and mapping and investigation. Distributed POS technology mainly consists of high-precision master POS and multiple small-sized IMU fixed on the task load. The transfer alignment filtering estimation of multiple sub IMU distributed on the flexible baseline is carried out by using the high-precision spatiotemporal measurement information from the main POS, so as to realize the accurate measurement of the flexible baseline multi node spatiotemporal reference [1-2]. The accuracy of inertial devices directly affects the measurement accuracy of distributed POS technology, so it is necessary to study the structure design and calibration of inertial devices. In order to provide high-precision navigation system for distributed POS, the paper designs the fiber optic gyroscope (FOG) integrated system. The structure of the system is designed and analyzed, and the IMU of the system is calibrated to verify the accuracy
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