南京大学学报(自然科学版) ›› 2018, Vol. 54 ›› Issue (3): 489–496.
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张金荣* ，吴 岭
Zhang Jinrong*, Wu Ling
摘要： 考虑到现有测控体制的带宽效率较低，研究基于高斯最小频移键控（Gaussian Minimum-Shift Keying, GMSK）+ 伪码（pseudo-noise code, PN）的新一代遥外测体制，以提高测控系统的带宽效率。首先描述了GMSK+PN信号的调制原理，将遥测数据的GMSK相位和伪码测距信号叠加后调制在同一载波上，实现了二者的同流传输。接着简述了GMSK+PN信号的解调原理，接收机经GMSK解调、测距信号重建和测距信号解调，得到遥测数据和伪距。然后对GMSK+PN的调制、解调进行仿真，得到了不同参数下的频谱特性、遥测误码率和测距精度等性能，并分析了性能与BT值、测距信号加权因子、测距成形脉冲、伪码码速率与遥测码速率的比值等参数取值之间的约束关系。最后给出调制参数的取值建议。结果表明，GMSK+PN体制具有很高的带宽效率，与现有航天测控体制相比，带宽降低22%以上，特别是在非线性信道下的优势更为明显。
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