小波消噪技术在非陀螺寻北系统中的应用

为消除基座扰动对非陀螺寻北系统测量精度的影响,采用小波消噪技术对系统的输出信号进行处理。提出了利用信号在多尺度下小波变换系数中,其有用信号为平稳信号,而干扰噪声的模极大值并不随小波分解尺度增加而减少的特性,来确定基座扰动在时域上的作用点,消除影响后再进行小波变换消噪的方法。通过实验证明,该方法能有效提高系统的寻北精度,并增强系统在大幅度基座扰动下快速寻北的鲁棒性。

Noise Elimination of Signal for Gyroless North Seeker on Wavelet Analysis

A new approach using the wavelet was presented for eliminating the effects of base motion disturbance on the accuracy of the gyroless north seeker.The useful signal is smooth in wavelet transform,but the locale maximum modulus of noise signal is contrary.Firstly the operation moment of the base motion disturbance was located in the time domain by observing the evolution of wavelet local modulus maxima across scales,and then the polluted data could be deserted,finally the noise was eliminated by using wavelet transform.Experimental results showed that this approach can effectively improve the performance of the north seeker and enhance the robustness of quickly north-seeking under the condition of big base motion disturbance.