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为了抑制卫星和地面通信系统间的相互干扰,为了扩大潜在的地球站的数量,以便有效地复用频率,现已研制出一种新的干扰消除系统.这种系统基本上采用了旁瓣消除器的原理,并设有主、辅天线.这种系统的创新在于辅助波道信号与主波道信号组合.以低频信号加以调制,通过包络检波求得残留包络,然后使用包络信号和低频信号,通过相位检波,从而获得幅度和相位控制电压.实验结果证明,在50MHZ上,对于CW·FM(TP·TV)和PSK信号来说,即使所需信号和干扰信号处在同波道中,其消除也可达40dB以上.在4.5KM线路的现场试验波道中,即使在衰落期间,也可获得很好的消除性能和响应.
In order to suppress mutual interference between satellite and terrestrial communication systems, a new interference cancellation system has been developed to extend the number of potential earth stations in order to efficiently reuse frequencies. This system basically uses sidelobe cancellation The principle of the device, and with the main and auxiliary antennas.The innovation of this system is that the auxiliary channel signal is combined with the main channel signal, modulated with a low frequency signal, the residual envelope is obtained by envelope detection, and then the envelope signal And low-frequency signals through the phase detector to obtain amplitude and phase control voltage.Experimental results show that at 50MHZ, for CW · FM (TP · TV) and PSK signals, even if the desired signals and interference signals are on the same wave Road, the elimination of up to more than 40dB. 4.5KM line in the field test channel, even during the decline, but also get a good elimination performance and response.