主瓣约束自适应旁瓣抵消器的实验研究

Experiments on a mainlobe constrained adaptive array processor

空间预滤波加无约束自适应噪声抵消器构成了一种主瓣约束的自适应旁瓣抵消器。这种自适应旁瓣抵消器由于实现了保持主瓣方向以及主瓣形状的导数约束，具有较好的主瓣保持性能，且结构简单，便于工程实现。本文在原有理论研究的基础上，着重从实验方面研究这种自适应旁瓣抵消器的主瓣保持和旁瓣抵消性能。设计并构造了一个实验系统，该系统利用一种新的空间预滤波结构，使其更宜于工程实现。进行了水池和海上试验，详细考察了输入信噪比、信号干扰比、信号与干扰带宽和自适应步长因子等参数对系统性能的影响。取得的结果证实了理论分析的正确性。

Experiments on a mainlobe constrained adaptive array processor is presented. In order to verifythe mainlobe constraint and the jammer cancelling Performance about the adaptive array, an experimentalsystem based on a hydrophone array and TMS320C25 digital signal processor is constructed togather with anadaptive spatial prefilter as reguired by previous theoretical analysis. Some typical experimental results aregiven. The experiments are carried out both in water pool and on the sea. The effects of the inputsignal-to-noise ratio (SNR), Signal-to-jammer ratio (SJR), signal and jammer bandwidth. and theadaptive step size on the system Performance are studied in detail. The results show that the theoretacal analysis is correct