非线性放大器对伪码测距误差的影响分析  

A Study on PN Code Ranging Error Caused by Nonlinear Power Amplifier

作　　者：李星[1] 耿淑敏[1] 欧钢[1] 庄钊文[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》2008年第5期49-55,共7页Journal of National University of Defense Technology

基　　金：国家重点研制项目资助

摘　　要：在高精度伪码测距系统中,高功率放大器(HPA)是信号发射链路的重要组成部分,HPA会对发射信号引入非线性失真,进而恶化系统的伪码测距性能。通过理论推导和数值分析的方法,研究HPA的非线性特性对高精度伪码测距误差的影响,给出非线性放大条件下,伪码跟踪误差与放大器类型、放大器输出回退(OBO)、扩频码形参数等的定量关系。研究结果对工程上HPA的选择、功率余量的保留、基带扩频码形的设计等具有重要的参考价值。In high precision PN code ranging systems, HPA is an important component. However HPA introduces nonlinear distortion. As a result, it decreases the ranging performance. The PN code ranging error caused by the nonlinearity of HPA is studied, by means of theoretical deduction and numerical simulation. Quantitative relation of ranging error and HPA type, HPA output back-off, code chip waveform parameter is employed. The research result provides important suggestion for the choice of HPA type, the reservation of HPA power and the design of PN code waveform.

关 键 词：高功率放大器 非线性 直接序列扩频 伪码测距 

分 类 号：TN927[电子电信—通信与信息系统]