Double Strobe Technique for Unambiguous Tracking of TMBOC Modulated Signal in GPS

A time-multiplexed double strobe scheme for unambiguous tracking of time-multiplexed binary offset carrier (TMBOC) modulated signal in GPS is presented. In the code tracking loop, two kinds of time-multiplexed strobe pulses are generated to track the BOC(1,1) and BOC(6,1) components, respectively. The strobe based on BOC(1,1) subcarrier eliminates the false lock points in the code discriminator, and the bump-jumping algorithm is not required. The other strobe employs the BOC(6,1) component to prevent additional signal-to-noise ratio loss. Thus, the proposed method simplifies the hardware structure in comparison with conventional strobe techniques, and improves the tracking performance in the presence of thermal noise and multipath.