基于小波变换的抑制复位噪声技术研究

分析了用于光纤陀螺的Y波导相位调制器在复位时,调制相位漂移对光纤陀螺系统特性的影响;紧接着测试了高精度光纤陀螺的毫秒输出,有一个和阶梯波复位同频的噪声,该噪声由Y波导的复位引起;为了实现对复位噪声的抑制,设计了一种基于FPGA的小波滤波方法;选取合适的小波基和分解层数;使用Verilog HDL编程语言实现小波滤波器在光纤陀螺闭环程序中的嵌套;通过实验比较,小波滤波具有明显的抑制复位噪声的效果,证明了小波滤波方案的有效性。

Research on the reset noise suppressedbased on wavelet transform

The influence on system characteristics of fiber optical gyroscope(FOG) of phase drift of modulator when Y-waveguide phase modulator used in FOG reset were analyzed. Afterward ,the millisecond output of high-precision FOG was tested, one kind of nosie which was synchronization to stepwave reset was caused by Y-waveguide reset .In order to suppress reset noise,one kind of wavelet filter is designed based on FPGA. Appropriate wavelet basis function and layers of wavelet packet was selected. Wavelet filter was nested in the program of closed-loop control FOG by the program language of Verilog HDL. The comparison of experiments show that the effect of reset noise suppressed is more availability, it is proved that the design of wavelet filter is valid.