一种针对高精度光纤惯导的多位置快速对准方法

In response to the problem the classic two-position and continuous rotation alignment schemes suffer from increased error in the azimuth angle alignment due to the drift of the fiber optic gyroscope scale factor after long-term storage of high-precision fiber optic inertial navigation system (INS), a multi-position rapid alignment scheme is proposed by redesigning the rotation scheme and the system states. This method has a simple rotation scheme that is easy to implement in engineering, and it is short in time and meets the requirements for rapid alignment. It not only inherits the advantages of the classic two-position and continuous rotation alignment schemes in being able to counteract or modulate the drift of the gyroscope, but also effectively suppresses the influence of the gyroscope scale factor error on the self-alignment accuracy. Simulation and physical experiment results show that when the gyroscope scale error is 0~200 ppm, the alignment results of the azimuth angle using the multi-position alignment scheme will not be significantly affected. When the gyroscope scale factor error is 200 ppm, the multi-position alignment scheme improves azimuth alignment accuracy by 46″ compared with the two-position scheme and by 106″ compared with the continuous rotation scheme.