小波滤波在光纤陀螺捷联惯导系统初始对准中的应用研究

针对光纤陀螺车载捷联惯导系统在晃动基座下传感器测量噪声增大，导致对准精度降低、对准时间长的问题，本文对小波滤波方法在光纤陀螺捷联惯导系统初始对准中的预滤波处理进行了研究，确定了合适的小波尺度分解级数及小波基，并进行实验验证。实验结果表明：此方法有效降低了光纤陀螺的测量噪声，提高了航向角的对准精度并缩短对准时间，在工程上具有一定的参考价值。

Study on the Wavlet Used in Initial Alignment of FOG SINS

The noise of fiber optic gyroscopes and accelerometers increase when the FOG SINS performed on a rocking base. It will cost FOG SINS much more time to accomplish the initial alignment ,with a low precision, even worse it makes the alignment fail. In this paper, Wavelet is used as the pre-filter befor initial alignment of FOG SINS, the proper level of wavelet decomposition and basic-wavelet are choised.then experiments are designed.the experiment results show that wavelet can work efficiently in the initial alignment. When the vehicle engine is on, the noises of fiber optic gyroscopes and accelerometers are reduced,and the Azimuth convergence becomes faster with a high precision.This conclusion can be used in some engineering appliacation.