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在卫星通信系统中,卫星是一个很重要的环节,卫星转发器的参数在一定程度上决定着整个系统的性能。转发式卫星导航系统是一个导航通信一体化的系统,通信系统中的微小卫星终端由于其发射天线波束宽,从邻星干扰方面考虑,远区卫星还处在微小卫星终端的主瓣内,因此发射功率受到了限制,是一个很明显的上行功率受限的系统。为了缓解对发射终端的压力,文中对卫星转发器的增益衰减档对整个通信系统的性能影响进行了分析,得到的结果显示,在转发器增益衰减档减小时,整个系统的性能可以得到提高。试验结果也表明,对于微小卫星终端系统,卫星转发器的增益档设置在2dB左右比较适宜。
In the satellite communication system, the satellite is a very important link, the parameters of the satellite transponder to a certain extent, determines the performance of the entire system. The transposing satellite navigation system is a system integrating navigation and navigation. Since the tiny satellite terminal in the communication system is wide in the beamwidth of the transmitting antenna, the satellite in the distant area is still located in the main lobe of the micro-satellite terminal Transmit power is limited, is a clear uplink power limited system. In order to alleviate the pressure on the transmitting terminal, the paper analyzes the impact of the gain reduction of the satellite transponder on the performance of the whole communication system. The results show that the performance of the whole system can be improved when the gain reduction of the transponder is reduced. The test results also show that, for the micro-satellite terminal system, satellite transponder gain file set at about 2dB is more appropriate.