抑制电离层Es层杂波的辅助天线设计方案

Design scheme for auxiliary antenna used for inhibition of ionospheric Es layer clutter

针对高频雷达中电离层Es层杂波的抑制问题,提出了水平极化天线阵列和垂直极化天线阵列两种辅助天线的设计方案.利用电离层Es层杂波信号与目标信号相比具有不同的到达方向和极化方式等特点,使辅助天线阵列对电离层Es层杂波具有一个大的增益,对目标信号有一个小的增益.辅助天线阵列的仿真分析结果表明,辅助天线输出中杂信比的大小会得到显著提高,辅助天线输出中杂信比越高,高频雷达中电离层Es层杂波的抑制效果越好.

Aiming at the inhibition problem of ionospheric Es layer clutter in high frequency( HF) radar,two design schemes for auxiliary antenna with horizontal polarizing antenna array and vertical polarizing antenna array were proposed. With the feature that the ionospheric Es layer clutter has different arrival direction and polarizing patterns compared with the target signal,the auxiliary antenna arrays have a bigger gain on the ionospheric Es layer clutter and a smaller gain on the target signal. The simulated results of auxiliary antenna arrays showthat the clutter to signal ratio in the auxiliary antenna output gets obviously improved. Furthermore,the higher the clutter to signal ratio in the auxiliary antenna output is,the better the inhibition effect of ionospheric Es layer clutter in the HF radar is.