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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。
In order to eliminate the influence of pedestal disturbance on the measurement accuracy of non-gyro north search system, the output signal of the system is processed by wavelet denoising technique. The useful signal of the wavelet transform coefficient in multi-scale is put forward to use the signal as a stationary signal, while the modulus maxima of the interference noise do not decrease with the increase of the wavelet decomposition scale to determine the role of the pedestal disturbance in the time domain Point, eliminate the influence after the wavelet transform denoising method. The experiment proves that this method can effectively improve the north-seeking accuracy of the system and enhance the robustness of the system to quickly find the north under the disturbance of large base.