The uncertainty of pseudo-code phase and carrier frequency shift are extremely important for GPS signal acquisition in the weak signal environment.
伪码相位及载波频偏不确定度是制约微弱信号环境下信号捕获性能的重要因素。
参考来源 - 辅助型GPS定位系统关键技术研究·2,447,543篇论文数据，部分数据来源于NoteExpress
But both of them are sensitive to carrier frequency shift, further, they have comparative BER under AWGN and Doppler shift environment.
但两者都对载波频率偏移敏感，且在AWGN和多普勒频移环境下表现相当。
A form of frequency modulation in which the carrier frequency is shifted between a mark frequency and a space frequency in response to the impressed intelligence signal (frequency-shift keying).
频率调制的一种方式，其中载波频率在标志频率和场频率之间移动，以响应外加的情报(数据)信号。
About GPS receiver, the research importance is high-dynamic receiver. The key is to solve the Doppler frequency shift caused by the high-speed movement of carrier.
在GPS接收机中，目前研究的重点是高动态环境下的接收机，其关键是解决载体高速运动给GPS接收机附加的多普勒频移问题。
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