多普勒频移对低轨卫星通信抗干扰的影响

Influence of Doppler shift on narrow-band interference suppression in Low-orbit satellite communication

低轨卫星具有多普勒频移大的特点。对存在同频段干扰情况下 ,卫星信号和干扰信号的多普勒频移的规律及其对抗干扰性能的影响进行了分析。结果表明 ,当卫星运行至地面终端和干扰源之间时 ,卫星有用信号和干扰信号的相对频移尤其大 。

The Doppler shifts of the signal from or to Low-orbit satellite are always large because the satellite velocity is very fast. The regulations of the Doppler shift of the signal and jamming are analyzed. It is proved that the relative shifts of the wanted signal and the jamming become especially large when the satellite moves between the terminal and the jammer. It requires higher means to trace and suppress the jamming.