一种改进的多级维纳滤波器误差加载算法

An Improved Error Loading Method for Multistage Wiener Filter

对角加载是目前广泛采用的提高自适应波束形成稳健性的技术之一。在分析多级维纳滤波器结构实现空时自适应处理算法的基础上,提出了一种改进的能够等价递推实现对角加载的误差加载算法。该算法在每一级递推计算中均对加载值进行一次修正,有效克服了传统方法的最终对角加载结果总是小于期望的加载值的缺点,避免了加载不足,其每级迭代计算过程只增加了两次实数乘法和加法运算。仿真结果证明了该算法的有效性。

Diagonal loading is a well-known technique to improve robustness for adaptive beamforming. The implementation of space-time adaptive processing （STAP） employing multistage Wiener filter （MWF） is first introduced, and then an improved error loading method whieh offers an equivalent solution of diagonal loading via reeursion is presented. By modifying the loading value at eaeh stage backward recursion with two real multiplications and additions, the new method prevents from the loading insuffieient whieh occurs in traditional method since the practical loading value is always less than the desired. Simulations support the new algorithm.