| 摘要: |
| 根据同播系统对同播发射机的要求，提出了一种利用GPS秒时钟修正晶体振荡器频率
漂移，实现高稳定度基准频率源的方法。该方法根据数字锁相原理，采用CPLD作数字鉴相器
，通过测量GPS秒时钟与压控晶体振荡器(VCXO)时钟间的相位差，并将其转变为直流电压控
制晶振频率，取得了频率稳定度优于2×10-9的成果，已成功应用于同播发射机中。 |
| 关键词: 同播发射机 基准频率源 频率稳定度 GPS秒脉冲 压控晶体振荡器 |
| DOI： |
|
| 基金项目:成都信息工程学院自然科学与技术发展基金项目(CSRF200805) |
|
| Design of Reference Frequency Source for Simulcast Transmitter |
| CHEN Ai-ping,ZHAO Ming,WEN Bin |
| (Chengdu University of Information Technology, Chengdu 610225, China) |
| Abstract: |
| According to the requirement of simulcast transmitter in a simulcast sy
stem,a method is proposed which uses GPS clock to correct the frequen
cy drift of crystal oscillator to achieve high stability reference frequency
source. This method is based on the principle of Digital Phase-Locked Loop (DP
LL), uses CPLD as Digital Phase Detector,measures the phase difference betwe
en GPS clock and VCXO clock, and converts it into DC voltage to control the freq
uency of crystal oscillator. This design has achieved the frequency stability be
tter than 2×10-9, and has been successfully applied in a simulcast transm
itter. |
| Key words: simulcast transmitter reference frequency source frequency stability GPS puls
e per second VCXO |
