用水平天线消除天波干扰的算法研究

天波电台干扰导致探测距离下降是高频地波探海雷达面临的主要问题,虽然用水平天线能够消除天波干扰,但要消除多个干扰需要使用多根水平天线,这在海边有限的场地条件下是不可行的.基于对干扰特性的分析,提出了一种将水平天线的信号两次混频、在时域分段滤波的新算法,可以用较少的水平天线消除多个干扰,理论和仿真证明了算法的有效性,从而为在有限场地条件下,用水平天线消除天波干扰的工程应用提供了实现方案.

Study of interference nulling using horizontal dipole antennas

It is the main problem of HF Surface Wave Radar that sky-wave disturbances minish detection-distances. Although using horizontal dipoles can suppress sky-wave distances,it is almost impossible in real situation that a large area is needed when multi-dipoles are used. Based on the analysis of sky-wave distances,a new algorithm is presented that disturbances are cancelled in subsection with signals from horizontal dipoles mixed twice with I,Q baseband signals,which can cancel multi-disturbances without more horizontal dipoles. Effectiveness of the algorithm has been proved by theory and simulation experiment, so the algorithm provides the realization method in real situation.