摘要
为提高探测器发射机功率利用率,在探测器和地球间建立可靠的传输链路,弱太阳闪烁中的信道预测十分重要。分析了行星聚合和太阳闪烁的物理特性,建立了弱太阳闪烁条件下的深空探测信道的Rician模型,并得出了当Rician因子大于10dB时近似为高斯信道的结论。通过分析闪烁功率谱,可以采用二阶AR模型预测信道。应用修正的Yule-Walker方程,提出了基于AR模型的信道预测方法,预测结果表明:幅度起伏一步预测误差在±0.005dB内,三步预测误差在±0.01dB内。
To improve the efficiency of power and set up a reliable communications link between Earth and probe in deep space exploration, it is very important to predict the communication channel clue to weak solar scintillation. The physical characteristics of solar conjunction and scintillation are presented, the Rician channel model is set up, and the Gaussian approaches of communications channel are obtained once Rician factor exceeds lOdB in deep space exploration due to weak solar scintillation. Analyzing the scintillation spectrum, two-order AR model is used to predict channel. Ug the modified Yule-Walker equations, the method of channel prediction based on AR model is described. We present one-step predicted error within 4- 0 005dB and three - step predicted error within 4- 0.01dB.
出处
《宇航学报》
EI
CAS
CSCD
北大核心
2009年第1期244-249,共6页
Journal of Astronautics
基金
国家高技术发展研究863计划(2006AA701205B)
关键词
太阳闪烁
聚合
深空探测
信道预测
Solar scintillation
Conjunction
Deep space exploration
Channel prediction
