相位均衡器技术在水声接收机的应用

Application of phase equalizer in underwater acoustic receiver

滤波器相位的非线性引起的信号失真是超短基线接收机系统中必须要解决的问题之一。采用常规滤波器与全通网络级联的方法设计了一种相位均衡器,解决了仅使用常规滤波器带来的非线性相位问题,使超短基线接收机在带宽内保持线性相位。给出了全通网络的原理、电路结构推导,分析了该网络中各参量对相位的影响。在设计实例中,相位均衡技术应用到实际硬件电路中进行测试,并结合试验数据及仿真结果对系统的性能进行评估。测试结果证明了相位均衡器可以实现相位的均衡校正功能,在水声接收机领域中有良好的应用前景。

The signal distortion caused by the phase nonlinearity of filter is one of the problems that must be solved in ultra-short baseline receiver system. In this paper, the cascade method of common filter and all-pass network is used to design the phase equalizer, which solves the nonlinear phase problem brought by using only the conventional filter, and makes the ultra-short baseline receiver maintain linear phase within the entire bandwidth. The principle and circuit structure of the all-pass network are described, and the influence of the network parameters on the phase is analyzed. a design example, this method is applied to the actual hardware circuit system for test, and combined with experimental data and analysis of simulation result, the performance of the system is evaluated. The test results show that the phase equalizer can achieve phase equalization and correction, and has a good application prospect in underwater acoustic receivers.