收发同源设备中相位噪声对信号的影响分析  

The influence of phase noise to signal analysis based on transmitter and receiver homologous equipment

作　　者：李蓬蓬[1] 葛锐[1] 韩其位[1] 欧钢[1] 

机构地区：[1]国防科技大学电子科学与工程学院,湖南长沙410073

出　　处：《国防科技大学学报》2013年第3期181-186,共6页Journal of National University of Defense Technology

基　　金：国家重大专项基金资助项目

摘　　要：收发同源设备中信号经过下变频、A/D采样、数字信号处理、D/A恢复和上变频等流程,本文给出了相应的信号传输模型,并针对频标相位噪声对信号通过的影响进行了分析,基于上、下变频时刻频标相位噪声发生变化的分析,推导出了频标相噪对信号经过收发同源设备所产生的影响表达式,并得出结论:由于频标相噪的存在,使得信号通过收发同源设备后伪码速率和载波均被引入一个与频标频率变化率相关的因子,可视为引入了多普勒偏移量,并明确给出了该偏移量的表达式。该结论与普遍认为的收发同源可以完全抵消频标相噪的影响有较大区别,实验验证结果较好地吻合了理论分析的结论。Signals through transmitting and receiving homologous equipment contain analog down conversion,A/D sampling,digital signal transfer and management,D/A recovering and analog up conversion.A signal transmission model of transmitter and receiver homologous equipment is presented,and an analysis of the influence of phase noise on the signal is made.Through an analysis of the frequency standard phase noise changes at down-convert moment and the up-convert moments,an expression for the influence of frequency standard phase noise upon the signals through transmitting and receiving homologous equipment was derived,and a conclusion was drawn that： because of frequency standard phase noise,signals through transmitting and receiving homologous equipment,RF carrier frequency and code rate were multiplied as a constant factor.It could be viewed as the equivalent to a Doppler offset shift,and its trend keeps consistent with frequency standard drift trend.The result is fundamentally different from the general conclusion.It considers that the transmitter and receiver derived by the same frequency standard can fully offset the impact.Finally,by designing the special experimental program,efforts were made to verify the derivation of Doppler drift factor expression.Experimental test results show that the Doppler shift test results are consistent with the formula derived result,and the frequency drift trend is in line with expectations.Therefore,the experimental test results met well with the deduced conclusion from the theoretical analysis.

关 键 词：收发同源设备 相位噪声 多普勒频移 

分 类 号：TN228.4[电子电信—物理电子学]