并联式恒模阵的共道信号接收算法与系统误差研究

Research of Cochannel Signal Recovery Algorithm and Sensitivity to System Error in Parallel Multistage Constant Modulus Array

并联式恒模阵由于利用了信号的恒模特性而且结构简单,被广泛应用于共道信号接收的研究中。但现有算法对信号波达角的信息要求较高,可能造成多个阵误收敛至同一信号,并且多为理想条件下的算法分析。针对这些问题,提出了一种基于初始假设的共道信号接收方法,并对误差条件下的系统性能进行仿真。仿真结果说明此方法无需对阵列进行校正,瞄准方向误差和阵元失效对并联式恒模阵的影响较小,而对阵元位置误差敏感性稍高。

The parallel multistage constant modulus (CM) array has been widely researched in the domain of cochannel signal recovery as it employs the signal characteristic of having constant modulus and has the simple structure. However, current algorithms are mostly analyzed under ideal situations and often require the knowledge of angel of arrival of the desired signal accurately or convergence to the same solution occasionally, and then more than one stage captures the same source. To overcome this loss, a method based on initialization prediction is presented. And the system performance under the situation with system error is described using numerical simulation. Computer simulations are conducted to illustrate that the method does not require array calibration and that the parallel multistage CM array is more robust to element-space errors than look direction error and element failure.