Abstract
The design of a modern Global Navigation Satellite System (GNSS) has been exceptionally valued by the military and civilians of various countries. The inclusion of the pilot channel in addition to the navigation data channel is considered one of the major changes in GNSS modernization. Schemes of an equal weight combination (1:1 combination) and power ratio combination for data and pilot are primarily adopted by traditional receivers. With the emergence of the new data and pilot modulation signals with unequal power, such as L1C at Global Positioning System (GPS) L1 frequency and B1C at BeiDou Navigation Satellite System (BDS) B1 frequency, the traditional combination coefficient cannot achieve optimal reception performance. Considering the influence of the combination coefficient on the reception performance, the optimal coefficient of the correlator joint is estimated in this paper. The entire architecture of the data/pilot correlator joint tracking and positioning with unequal power is given. Based on the equivalence principle of the correlator joint and the discriminator joint, the optimal coefficient of the carrier loop is determined. A mathematical model of joint code tracking accuracy is established, and the optimal coefficient of the code loop is determined. The real-life satellite signal and simulation results show that the amplitude–ratio combined scheme is the best for receiving of correlator joints, followed by the power–ratio combination scheme and, finally, the 1:1 combination scheme. It is worth mentioning that the positioning accuracy of the amplitude–ratio combination is improved by 2% compared to the 1:1 combination, and by 1.3% compared to the power–ratio combination for B1C signal. The positioning accuracy of the amplitude–ratio combination is improved by 2.37% compared to the 1:1 combination, and by 1.6% compared to the power–ratio combination for L1C signal. The conclusions of this paper are validated for the traditional data/pilot with an equal power allocation. The techniques and test results provide technical support for GNSS high-precision-user receivers.
Highlights
B1C and the L1C signals, Figure 11 shows the delay-locked code loop (DLL) and PLL results of all real-life satellite signals involved in the positioning solution
The code loop bandwidth was set to 5 Hz, signals involved in the positioning solution
The code loop bandwidth was set to 5 Hz, the the carrier loop bandwidth was set to 30 Hz, and the phase detector interval was set to carrier loop bandwidth was set to 30 Hz, and the phase detector interval was set to 0.15
Summary
The growing demand for location, navigation and positioning services is boosting the development of high-utilization ratio signals, which have been developed by a new generation of global navigation satellite system (GNSS). Compared with traditional navigation signals, pilot channels appear in modernized navigation signals, such as GPS-L2C, GPS-L5C, Galileo satellite navigation system (Galileo)-E1, Galileo-E5, Galileo-E6OS, BDS3. -B2, Global Navigation Satelite System (GLONASS)-G3OC signal [1–3]. The navigation message is loaded on the data channel, and the pilot channel is only loaded with the 4.0/). Such a signal structure improves the receiving performance, and promotes improvements in the receiving method
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