极轨气象卫星信号强度差别对解调器工作性能的影响及其对策

摘要

针对卫星信号解调器接收极轨卫星信号时出现大量误码的现象,研究分析了极轨气象卫星信号强度的变化及其对解调器工作性能的影响.结合极轨气象卫星信号的特点和电平强度分析,以及卫星信号解调器的电路原理图,对于卫星信号接收电平变化超出解调器正常工作范围的原因作了分析判断并提出了解决对策.通过在该解调器前增加自动增益控制器和衰减器,可以较稳定地将波动的信号电平控制在一个合适值.实测表明该方法可以保证在一定范围的信号电平起伏超出设备正常工作范围时,解调器也能正确解调出卫星信号.该方法有效改善实时高分辨率图像传输(HRPT:High Resolution Picture Transmission)数据接收异常的现象,在设备维护维修中具有适用性.%For the bad reception of polar orbit satellite,the impact of the signal intensity of the polar satellite on the demodulator and the corresponding counter measures are studied.According to the signal characteristics of the polar-orbit meteorological satellite and the power level,as well as the circuit principle diagram of the satellite demodulator,the reasons for satellite reception level changing beyond the scope of the modulator are analyzed,and the countermeasure is put forward.The measured results show that the signal level can be controlled at an appropriate value steadily by adding an automatic gain controller and an attenuator before the demodulator.The abnormal reception of the HRPT (High Resolution Picture Transmission) data is effectively solved and the quality of the satellite cloud picture receiving is improved.The solution is applicable in equipment maintenance.