| 摘要: |
| 接收信号动态范围已成为衡量接收基带性能的重要指标。对扩频卫星导航通信系统
中的扩频通信接收基带动态范围从物理角度用数学方法进行了分析，阐述了扩频接收基带前
端的射频系统对接收基带正常工作的影响，对扩频接收基带信号捕获门限进行了探讨分析，
重点利用AD8310芯片设计了扩频接收基带自动增益控制（AGC）接口参考电平，可以实现扩
频接收基带射频（RF）信号大动态范围的信号检测和控制。 |
| 关键词: 卫星导航 扩频通信 基带 动态范围 三阶交调 虚警概率 |
| DOI： |
|
| 基金项目:国家重点基础研究发展计划（973计划）项目（2007CB815500）
；国家自然科学基金资助项目（61001109） |
|
| Spread Spectrum Receiver′s Dynamic Range：Analysis and Discussion |
| HU Zheng-qun,ZHANG Jie,SHI Hu-li,PEI Jun,DU Xiao-hui |
| (National Astronomical Observatory,Chinese Academy of Sciences, Beijing 100012,
China) |
| Abstract: |
| The dynamic range of
received signal has become the important measurement index
of receiver baseband performance. In the satellite navigation and communications
system, the dynamic range of spread spectrum receiver baseband is analysed with
mathematical methods from physical point of view. The effect of th
e spread spectrum receiver baseband′s front-end RF system on the normal operati
on of receiver
is explained, the spread spectrum receiver baseband′s signal acquisition thres
ho
ld is discussed. Especially, AD8310 is used as the interface reference electric
level of AGC(automatic gain control) to realize RF receiving signal
control in large dynamic range. |
| Key words: satellite navigation spread spectrum communication ba
seband dynamic range third order inter modulation probability of false alarm |
《电讯技术》编辑部 