摘要
本文针对转发式导航卫星中卫星转发器输出功率受自动增益控制,从而导致输出信号相位噪声受输入信号功率影响这一现象,提出了一种准确测量输出信号相位噪声的方法。该方法使得转发器对输出信号相位噪声的影响降低。同时,本文分析了星载高功率放大器对转发器输出信号相位噪声的恶化;通过分析相位噪声时域的表现形式--抖动,推导出相位噪声对下行测距精度的影响;最后,对采用该相位噪声测试方法前后测距精度的恶化程度进行分析,表明了该方法能够在一定程度上降低相位噪声对下行测距精度的影响。
According to the mechanism of Automatic Gain Control for navigation transponder, the phase noise of output signal would be impacted by power of input signal. One method is proposed to measure output signal phase noise precisely. This method decreases transponder impact on output signal phase noise. Then, the deterioration of phase noise is analysed, which is influenced by high power amplifier. Jitter, the description of phase noise in time domain, is also researched. Finally, ranging accuracy of downlink signal is compared within or without adopting the proposed method. Result indicates that the presented method could effectively reduce ranging accuracy deterioration which is caused by phase noise.
作者
施鑫
李怡谦
李文倩
Shi Xin;Li Yiqian;Li Wenqian(The 28th Research Institute of China Electronics Technology Group Corporation,Nanjing 210007,China)
出处
《信息化研究》
2019年第5期32-36,共5页
INFORMATIZATION RESEARCH
关键词
相位噪声
转发式导航
测距精度
抖动
phase noise
navigation transponder
ranging accuracy
jitter
