Direct Doppler shift estimation for compass-M1 B2 signal

作者：Hao, Yanling; Zu, Bingfa^*; Huang, Ping

来源：Journal of Huazhong University of Science and Technology (Natural Science Edition), 2010, 38(6): 15-18.

• Data blocks
• Doppler estimations
• Phase complement
• Satellite navigation systems
• Software receivers

"COMPASS-M1"(Beidou2) satellite navigation system broadcasts civil signals on B2 band with AltBOC(15, 10) modulation which contains two QPSK (quadrature phase shift keying)channel separately, one in phase data channel and one quadrature pilot one. To realize fast signal acquisition for software receiver, one can accumulate pilot signal periodically for its dataless feature to improve signal' SNR (signal to noise ratio) and make a direct detection. "Phase complementation and synchronized data block accumulation" method was adopted to acquire Doppler shift directly. To shorten the acquisition time, the paper proposes a improvement of double data blocks accumulation, which can shorten the acquisition time twice without frequency sensitivity lost. The simulation results show that the double data blocks accumulation method can acquire Doppler shift with some amplitude degradation directly and effectively.

• 出版日期2010
• 单位哈尔滨工程大学