Introduction to BeiDou‐3 navigation satellite system

Yang, Yuanxi; Gao, Weiwei; Guo, Shuren; Mao, Yue; Yang, Yufei

doi:10.1002/navi.291

Cited by 320 publications

(140 citation statements)

References 18 publications

Supporting

Mentioning

139

Contrasting

Order By: Relevance

“…BDS-3 is downward compatible with B1I and B3I signals as well as the addition of new B1C and B2a signals. The frequencies, code rates, and modulation scheme of the BDS-3 signals are summarized in Table 1 [22,23]. In addition to the public service signals in Table 1, there are B1A in Binary Offset Carrier (BOC) (1,1) modulation, B3C Quadrature Phase Shift Keying (QPSK) (10) modulation and B3A in BOC (15,2.5) modulation authorized service signals [22], which are not be described in detail here.…”

Section: Development Of the Beidou Systemmentioning

confidence: 99%

Analyzing the Satellite-Induced Code Bias Variation Characteristics for the BDS-3 Via a 40 m Dish Antenna

Hong

Zhang

et al. 2020

Sensors

View full text Add to dashboard Cite

The satellite-induced code bias variation of geostationary satellite orbit satellites and medium earth orbit satellites of the second-generation BeiDou Navigation Satellite System (BDS-2) exceeds 1 m, which severely affects the accuracy and stability of the ambiguity resolution and high-precision positioning. With the development of the third-generation BDS (BDS-3) with a new system design and new technology, analysis of the satellite-induced code variation characteristics of BDS-3 has become increasingly important. At present, many scholars have explored the satellite-induced code bias of BDS-3, but most of them focus on BDS-3 experimental satellites via normal geodetic antenna. Compared to normal geodetic antenna, the 40-m dish antenna from the National Time Service Center can accurately detect satellite-induced code variations with low noise and high gain. Thus, observational data from fifteen BDS-3 medium earth orbit satellites are collected with the B1I/B2b/B3I/B1C/B2a frequency bands on the day of year (DOY) 199-206 in 2019, the PRN numbers of which are C19/C20/C21/C22/C23/C24/C25/C26/C27/C28/C30/C32/C33 /C35/C37, via the 40 m dish antenna to analyze the code bias variation characteristics. The results show that the obvious satellite-induced elevation-dependent code bias variations exist in the B1I/B2b/B3I/B1C/B2a frequency bands of C28, compared with other satellites. Similarly, the multipath (MP) combination of B3I has an obvious elevation-dependent variation within a range of 0.1 m for C21/C24/C27/C28/C37 and elevation-dependent variation of the B2a and B2b frequency bands also exists in most satellites with a range of 0.1 m. However, the MP combination values of some satellites are asymmetric with respect to elevation, which is different from BDS-2 satellites and especially obvious for BDS-3 satellites B1I and BIC frequency bands with elevation-dependent variations of 0.2 m, indicating that the code bias variation is not uniquely related to elevation, especially for the B1I/BIC frequency bands. What's more, the satellite-induced code bias variation of the BDS-3 satellites is greatly reduced compared with that of the BDS-2 satellites. In addition, the similar code bias variation appears at the Xia1 station with a normal geodetic antenna of B1I/B1C/B3I/B2a/B2b of C21, B3I/B2a/B2b of C24 and B2b of C28 among B1I/B1C/B3I/B2a/B2b of C21/C24/C27/C28/C37. The influence of the BDS-3 satellite-induced elevation-dependent code bias on precision positioning and ambiguity fixing is worth further study using different antennas or receivers.

show abstract

Section: Development Of the Beidou Systemmentioning

confidence: 99%

Analyzing the Satellite-Induced Code Bias Variation Characteristics for the BDS-3 Via a 40 m Dish Antenna

Hong

Zhang

et al. 2020

Sensors

View full text Add to dashboard Cite

show abstract

“…The BeiDou global navigation satellite system, (BDS-3), is the third step of China's satellite navigation system construction [1,2]. In addition to the positioning, navigation and timing (PNT) service provided by all GNSSs, BDS-3 also provides regional message communication (1000 Chinese characters per time) and global short message communication (40 Chinese characters per time), global search and rescue service (SAR), regional precise point positioning (PPP) service, embedded satellite-based augmentation service (BDS-BAS), and space environment monitoring function [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Basic performance and future developments of BeiDou global navigation satellite system

Yang¹,

Mao²,

Sun³

2020

Satell Navig

Self Cite

371

View full text Add to dashboard Cite

The core performance elements of global navigation satellite system include availability, continuity, integrity and accuracy, all of which are particularly important for the developing BeiDou global navigation satellite system (BDS-3). This paper describes the basic performance of BDS-3 and suggests some methods to improve the positioning, navigation and timing (PNT) service. The precision of the BDS-3 post-processing orbit can reach centimeter level, the average satellite clock offset uncertainty of 18 medium circular orbit satellites is 1.55 ns and the average signal-inspace ranging error is approximately 0.474 m. The future possible improvements for the BeiDou navigation system are also discussed. It is suggested to increase the orbital inclination of the inclined geostationary orbit (IGSO) satellites to improve the PNT service in the Arctic region. The IGSO satellite can perform part of the geostationary orbit (GEO) satellite's functions to solve the southern occlusion problem of the GEO satellite service in the northern hemisphere (namely the "south wall effect"). The space-borne inertial navigation system could be used to realize continuous orbit determination during satellite maneuver. In addition, high-accuracy space-borne hydrogen clock or cesium clock can be used to maintain the time system in the autonomous navigation mode, and stability of spatial datum. Furthermore, the ionospheric delay correction model of BDS-3 for all signals should be unified to avoid user confusion and improve positioning accuracy. Finally, to overcome the vulnerability of satellite navigation system, the comprehensive and resilient PNT infrastructures are proposed for the future seamless PNT services.

show abstract

“…Among other reasons, the discrepancies can be attributed to the following: the satellite orbits are different not only between GNSSs but also within the same constellation. For instance, BDS contains three types of orbit satellites, medium Earth orbit (MEO), geostationary Earth orbit (GEO) and inclined geo-synchronous orbit (IGSO) [13,14]; the signal structure adopted by GPS, BDS and Galileo is CDMA, while that by GLONASS is FDMA.…”

Section: Introductionmentioning

confidence: 99%

Helmert Variance Component Estimation for Multi-GNSS Relative Positioning

Nie

et al. 2020

Sensors

View full text Add to dashboard Cite

The Multi-constellation Global Navigation Satellite System (Multi-GNSS) has become the standard implementation of high accuracy positioning and navigation applications. It is well known that the noise of code and phase measurements depend on GNSS constellation. Then, Helmert variance component estimation (HVCE) is usually used to adjust the contributions of different GNSS constellations by determining their individual variances of unit weight. However, HVCE requires a heavy computation load. In this study, the HVCE posterior weighting was employed to carry out a kinematic relative Multi-GNSS positioning experiment with six short-baselines from day of year (DoY) 171 to 200 in 2019. As a result, the HVCE posterior weighting strategy improved Multi-GNSS positioning accuracy by 20.5%, 15.7% and 13.2% in east-north-up (ENU) components, compared to an elevation-dependent (ED) priori weighting strategy. We observed that the weight proportion of both code and phase observations for each GNSS constellation were consistent during the entire 30 days, which indicates that the weight proportions of both code and phase observations are stable over a long period of time. It was also found that the quality of a phase observation is almost equivalent in each baseline and GNSS constellation, whereas that of a code observation is different. In order to reduce the time consumption of the HVCE method without sacrificing positioning accuracy, the stable variances of unit weights of both phase and code observations obtained over 30 days were averaged and then frozen as a priori information in the positioning experiment. The result demonstrated similar ENU improvements of 20.0%, 14.1% and 11.1% with respect to the ED method but saving 88% of the computation time of the HCVE strategy. Our study concludes with the observations that the frozen variances of unit weight (FVUW) could be applied to the positioning experiment for the next 30 days, that is, from DoY 201 to 230 in 2019, improving the positioning ENU accuracy of the ED method by 18.1%, 13.2% and 10.6%, indicating the effectiveness of the FVUW.

show abstract

Introduction to BeiDou‐3 navigation satellite system

Cited by 320 publications

References 18 publications

Analyzing the Satellite-Induced Code Bias Variation Characteristics for the BDS-3 Via a 40 m Dish Antenna

Analyzing the Satellite-Induced Code Bias Variation Characteristics for the BDS-3 Via a 40 m Dish Antenna

Basic performance and future developments of BeiDou global navigation satellite system

Helmert Variance Component Estimation for Multi-GNSS Relative Positioning

Contact Info

Product

Resources

About