【摘 要】
:
The B1C signal of Beidou-3 satellite navigation system adopts data and pilot separation to realize the transmission of message information and ranging functions. The traditional tracking method uses s
【机 构】
:
National Time Service Center, Chinese Academy of Sciences, Xi’an 710600, China;School of Electronic,
论文部分内容阅读
The B1C signal of Beidou-3 satellite navigation system adopts data and pilot separation to realize the transmission of message information and ranging functions. The traditional tracking method uses separate data to demodulate the message information, which doesnt fully utilize the signal energy and data-pilot phase relationship, resulting in low tracking accuracy. In order to demodulate the navigation message information more accurately, based on the phase relationship between the data channel and the pilot channel, this paper introduces the tracking strategy of "data + pilot" joints in loop tracking, and proposes three joint methods with different complexity, including "correlator output amplitude superposition", "discriminator output linear union"and "loop filter output linear union". The tracking accuracy of pseudo-code tracking loop and carrier tracking loop under different joint modes is theoretically analyzed, and the applicability of joint tracking in different scenarios is given. Finally, the measured data based on different satellites shows that the higher the inter-code consistency between the data and the pilot, the more obvious the improvement of joint tracking is. The ‘correlator output amplitude superposition method performs the high tracking accuracy and the simplest structure under higher SNR conditions. Under lower SNR conditions, the combination of "code loop filter output linear union + carrier loop discriminator output linear union" shows the highest tracking accuracy and the lowest tracking threshold. Although the loop filter combination increases the loop complexity, it adapts to a wider scene.
其他文献
At present, Chinas BDS has entered a new era of global networking, and the application industry has shown a rapid development trend. With the rapid development of BDS’ global system construction and i
According to the rare existing researches of RDSS position service of satellite navigation system, this article evaluates RDSS position service performance using the time series analysis method based
The performance of on-board atomic clock directly affects the accuracy of navigation and positioning for users. Evaluating the performance of on-board atomic clock is an important part of the construc
In GNSS/INS integrated navigation, Due to the deep processing to the baseband level of GNSS, the hardware integration is difficult, so most of them are still in the stage of simulation and principle v
The satellite differential code bias (DCB) characterizes the time it takes for the signal to travel from the reference clock to the transmitting antenna. The internal delay of the signal can be up to
The ionospheric delay has a very important influence on the positioning accuracy of satellite navigation. It can be effectively reduced by establishing an accurate and reasonable ionospheric correctio
A high-performance lamp-pumped rubidium atomic frequency standard (RAFS) prototype is developed. In the physics package of the RAFS, a rubidium spectral lamp with Xe as the starting gas and the isotop
The traditional single base station GNSS deformation monitoring system is greatly influenced by the base station stability and data quality. In order to improve the accuracy and reliability of monitor
The accuracy of satellite ephemeris directly affects the accuracy of navigation and positioning. The BDS-3 under construction in China is based on the BDS-2 system, and the Beidou global satellite nav
We focus on the accuracy analysis and improvement of multi-GNSS precise point positioning (PPP) during ionospheric scintillation. By using the observation data from Hong Kong Satellite Positioning Ref