一种模数结合的闭环迭代旁瓣对消方法

A Closed Loop Iterative Method for Sidelobe Cancellation Using an Analog and Digital Mixed System

旁瓣对消是一种有效的自适应干扰抑制方法。文中介绍了一种模数结合的旁瓣对消系统的结构和工作原理,提出了基于迭代的闭环旁瓣对消方法。利用该方法,可在模拟端连续输出干扰抑制后的信号;当信号发生变化时,该方法能实时更新旁瓣对消系统的干扰抑制权值;通过权值的持续迭代,还能够自动修正系统中一些非理想因素带来的影响,使系统的旁瓣对消权值靠近最优解。通过使用这种闭环迭代方法,可以使原来的旁瓣对消系统更实用。

Sidelobe cancellation is an effective adaptive method of interference suppression.In this paper,an analog and digital mixed system for sidelobe cancellation is introduced,its working principles and processes are given in detail.A closed loop sidelobe cancellation method based on iteration is proposed.With this method,the analog signal after interference suppression can be produced continuously,and the weight vector of sidelobe canceller can be updated in real time.Furthermore,the error brought in by some undesirable factors of the system can be fixed automatically,making the weight of sidelobe cancellation close to the optimal solution.The original sidelobe cancellation system will be more practical by using this iterative method.