双径模型在PCM/FM再入遥测系统分析中的应用  

Application of Two-Path Model in Analyzing PCM/FM Reentry Remote Sensing Systems

作　　者：严匡武[1] 贺知明[1] 黄强[2] 

机构地区：[1]电子科技大学电子工程学院,成都610054 [2]中国工程物理研究院电子工程研究所,四川绵阳621900

出　　处：《电子科技大学学报》2006年第6期865-868,共4页Journal of University of Electronic Science and Technology of China

基　　金：国家自然科学基金资助项目(10376004)

摘　　要：针对存在多径衰落的PCM/FM再入遥测系统,分析了双径模型的幅频、相频、群延迟等特性及幅度失真、延迟失真、信道衰减因子、码速率等对接收机带来的影响。通过分析得到:幅度失真通常对数据的解调不会产生影响;单独的延迟失真使接收信号的幅度发生较大变化,而延迟失真与信道衰减因子的共同作用将改变接收机的性能边界;单一地提高码速率将导致更低的系统性能参数。该文为工程应用中合理设计再入遥测系统提供了参考。Aimed at PCM/FM reentry remote sensing systems existed in multipath-Induced, the characteristic of amplitude, phase, group delay of the two-path model is analyzed based on presenting some typical theoretical models of reentry remote sensing transmission channel. And the effects on receiver （which are cause by the change of amplitude distortion）, group delay distortion, bit rate and channel attenuation factor are analyzed by using twopath model. Delay distortion can cause large amplitude variance of receiving signal. And the joint action between delay distortion and channel attenuation factor influences receiver＇s performance boundary. Increasing bit rate alone directly leads to worse capacity parameters of the system. The simulation results give references to design reentry remote sensing system rationally in engineering application.

关 键 词：再入遥测 多径衰落 PCM/FM 双径模型 

分 类 号：TN914.2[电子电信—通信与信息系统]