WANG Jin1,2,3, LU Xiao-chun1,3, ZHAO Hang1,3, BAI Yan1,2,3
(1. National Time Service Centre, Chinese Academy of Sciences, Xi′an 710600, China;
2. Graduate University of Chinese Academy of Sciences, Beijing 100039, China;
3. Key Laboratory of Precision Navigation and Timing Technology, National Time Service Center,
Chinese Academy of Sciences, Xi′an 710600, China)
Abstract: 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.
Key words: channel performance; gain flatness; EVM(error vector magnitude); group delay
