摘要
GNSS空间信号质量评估系统的接收通道是评估导航信号质量的主要误差源之一。通过分析接收通道特性引起的信号幅度误差、相位失真、频率偏移等现象,研究了接收通道增益平坦度、幅度误差、相位误差、频率偏移、矢量误差幅度、群时延等机理,提出了相应的测试方法,测试结果表明接收通道性能能够满足空间信号质量评估的要求。
The receiving channel of GNSS signal quality assessment system is one of the main error sources for signal quality assessment system. Through the analyses of the signal amplitude error, phase distortion, frequency offset, etc., which are related to the characteristics of receiving channel, the mechanisms of gain flatness, amplitude error, phase error, frequency offset, error vector magnitude（EVM） and group delay are studied. A corresponding test method is proposed and the test shows that the receiving channel performance satisfies the requirements of the space signal quality assessment system.
出处
《时间频率学报》
CSCD
2012年第4期235-243,共9页
Journal of Time and Frequency
基金
国家自然科学基金资助项目(11073022)
中国科学院"西部之光"人才培养计划资助项目(Y001YR3701)
关键词
通道性能
增益平坦度
矢量误差幅度
群时延
channel performance
gain flatness
EVM（error vector magnitude）
group delay
