中文摘要：

受到实际条件的限制,自适应旁瓣相消器通常不可能频繁地更新自适应权值,使得其在对抗空域非平稳干扰时,会出现权值失配现象,严重影响干扰抑制性能。该文从空域密集干扰产生宽零陷的角度出发,提出一种适用于自适应旁瓣相消器的零陷展宽算法。该算法通过对主通道的合成权值和辅助天线间的协方差矩阵同时进行锥削实现零陷展宽,锥削向量和锥削矩阵只与阵元位置和展宽宽度有关,可以离线计算,在线直接调用,实现简单,适合工程实际使用。仿真实验证明,该文方法可以有效展宽自适应零陷,增强自适应旁瓣相消器对抗空域非平稳干扰时的稳健性。

英文摘要：

In practical application, the adaptive weight of the sidelobe canceller can not be updated frequently. Thus, the spatial nonstationary interference would lead to the mismatch between the weight and the snapshots, which seriously deteriorates the cancellation performance of the sidelobe canceller. A null broadening algorithm is proposed for the sidelobe canceller, which is performed by tapering the conventional beamformer output and the covariance matrix of the auxiliary elements simultaneously. The taper vector and matrix only depend on the elements location and null width meaning that they can be designed offline and are quite suitable for practical use. Simulation results verify the effectiveness of the proposed method.