基于数字滤波和相位补偿的舰船升沉测量方法

Measurement method for ship heave motion based on digital filtering and phase compensation

在对舰船升沉运动进行惯性测量的过程中,引入IIR数字高通滤波器可以较好地处理惯导系统垂向通道的发散,但滤波器输出信号相对于实际信号存在相位超前、幅值衰减等问题。提出了基于带限傅里叶线性组合(BMFLC)算法的改进后的升沉测量方法,在最大程度地滤除低频干扰的基础上,分别对数字高通滤波后的垂向速度和升沉位移进行幅值和相位补偿。仿真及转台试验结果均验证了新方法的可行性。

During the inertial measurement of the ship heave motion, the introduction of IIR digital high-pass filter can better deal with the divergence of vertical channel of the inertial navigation system, but the output signal of the filter has problems such as phase advance and amplitude attenuation compared to the real signal.Aiming at the above problem, an improved heave measurement method based on bandlimited multiple Fourier linear combi-ner(BMFLC)algorithm is proposed to compensate both amplitude and phase for filtered vertical velocity and heave displacement respectively on the basis of filtering out low-frequency interference to the greatest extent.Simulation and turntable experiment results verify the feasibility of the new method.