超低频通信中海洋补偿滤波器设计

Design of Ocean Compensation Filter for Super Low Frequency (SLF) Communication

分析了超低频接收机中海洋补偿滤波器的作用,分别采用1零点1极点、2零点1极点无限脉冲响应滤波器设计超低频海洋补偿滤波器,零点和极点通过数值计算得到。分析结果表明:在20～200Hz频段内,实现的滤波器可以很好地逼近理论的海洋补偿滤波器;在0～130m范围内,实现的2零点1极点滤波器可以将幅度响应误差控制在1 dB左右,能满足超低频接收机的设计要求。

This paper discusses the role of ocean compensation filter in Super Low Frequency（SLF） receiver and the design of the ocean compensation filter for SLF communication by both Infinite Impulse Response（IIR） filter with one zero and one pole, and IIR filter with two zeros and one pole. The zeros and poles are determined nu- merically. Calculation results show that the implemented filters can well approximate the magnitude of frequency response of the theoretical ocean compensation filter over 20 - 200 Hz. The implemented I1R filter with two zeros and one pole maintains the amplitude error less 1 dB for 0 - 130 m depth. It can meet the design requirements of SLF receiver.