摘要
捕获是GNSS接收机信号处理中的关键部分,在弱信号条件下,传统基于包络检波的捕获方法由于检波损耗太大已不再适用。介绍了一种新的检波方法——点积差分检波来取代传统的包络检波,为弱信号条件下GNSS接收机的捕获设计提供了理论依据。理论分析表明,点积差分检波在弱信号条件下引入的检波损耗远低于包络检波,可用于有频率辅助的GNSS接收机的弱信号捕获。最后,通过仿真实验验证了理论分析的正确性。
Signal acquisition is a key phase of GNSS signal processing. In weak signal environment, GNSS signal is normally 10 dB to 30 dB lower than line of sight （LOS） signal, and conventional acquisition method based on non-coherent integration is not adequate due to squaring loss. In the paper, a new acquisition method based on dot product integration is presented for GNSS receiver design in weak signal circumstance. Theoretical analysis shows that the proposed method introduces much lower demodulation loss than the conventional method, and is adequate for frequency-aided GNSS receiver in weak signal environment. At last, MATAB simulation result verifies the validity of the theoretical analysis.
出处
《无线电通信技术》
2010年第3期14-16,共3页
Radio Communications Technology
关键词
GNSS接收机
弱信号捕获
点积差分
GNSS receiver
weak signal acquisition
dot product integration
