透明转发器卫星通信系统在干扰条件下的性能

Performance of transparent transponder satcom system with interference

本文研究了存在上行干扰时透明转发器卫星通信系统的性能。首先对透明转发器卫星通信系统在上行干扰条件下性能进行了分析并给出了计算误比特率性能的数学表达式,然后对其中两种典型情况进行了仿真和分析。研究结果表明:通常认为无抗干扰能力的窄带多址技术结合放大器输入回退,在干扰条件下同样具有一定的健壮性;而且,导致多个用户同时达到不可接受误比特率的干扰信号功率必须与所有用户信号的总功率相当,并且该功率通常比导致转发器进入饱和状态的功率要小一些。

The robustness of transparent transponder satcom to uplink jamming is investigated. Firstly the performance of transparent transponder satcom system is analyzed to uplink interference (or jamming) and the closed expression for calculating BER performance is given. Also the simulation is done for the two typical cases. It is shown that multiple accesses combined with HPA backoff provide a form of protection from jamming. The jamming level needed to cause all users to have unacceptable error bit rates must be comparable to the sum of the users powers. And it was found that this level is generally slightly lower than that to cause the transponder to enter saturation state.