Benefits of BDS-3 B1C/B1I/B2a triple-frequency signals on precise positioning and ambiguity resolution

Li, Jinlong; Yang, Yuanxi; He, Haibing; Guo, Hang

doi:10.1007/s10291-020-01016-8

Cited by 30 publications

(19 citation statements)

References 21 publications

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“…where L c and ϕ c represent the combined observations in meters and cycles, λ c is the combined wavelength, η i represents the combined coefficient of each frequency. Correspondingly, the first-order ionospheric delay amplification factor of the combined observation can be expressed as [35]:…”

Section: Linear Combination Of Carrier-phase Observationsmentioning

confidence: 99%

Research on Linear Combination Models of BDS Multi-Frequency Observations and Their Characteristics

Guo

et al. 2022

Sustainability

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The linear combination of multi-frequency carrier-phase and pseudorange observations can form the combined observations with special properties. The type and number of combined frequencies will directly affect the characteristics of the combined observations. BDS-2 and BDS-3 broadcast three and five signals, respectively, and the study of their linear combination is of great significance for precision positioning. In this contribution, the linear combination form of multi-frequency carrier-phase observations in cycles and meters is sorted out. Seven frequency combination modes are formed, and some special combinations for positioning are searched. Then, based on the principle of minimum combined noise, a simpler search method for the optimal real coefficients of ionosphere-free (IF) combination based on the least squares (LS) principle is proposed. The general analytical expressions of optimal real coefficients for multi-frequency geometry-based and ionosphere-free (GBIF), geometry-free and ionosphere-free (GFIF), and pseudorange multipath (PMP) combinations with the first-order ionosphere delay taken into account are derived. And the expression derivation process is given when both the first-order and second-order ionospheric delays are eliminated. Based on this, the characteristics of the optimal real coefficient combination in various modes are compared and discussed. The various combinations reflect that the accuracy of the combined observations from dual-frequency (DF) to five-frequency (FF) is gradually improving. The combination coefficient becomes significantly larger after taking the second-order ionospheric delay into account. In addition, the combined accuracy of BDS-3 is better than that of BDS-2. When only the first-order ionosphere is considered, the combination attribute of (B1C, B1I, B2a) is the best among the triple-frequency (TF) combinations of BDS-3. When both the first-order and second-order ionospheric delays are considered, the (B1C, B3I, B2a) combination is recommended.

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Section: Linear Combination Of Carrier-phase Observationsmentioning

confidence: 99%

Research on Linear Combination Models of BDS Multi-Frequency Observations and Their Characteristics

Guo

et al. 2022

Sustainability

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“…At this time, the ionospheric delays and combination observation noises are reduced to a great extent. Some similar definitions can also be found in [25], [26]. According to the statistics, the total number of high-quality combinations with three, four and five frequencies which satisfy the above conditions are 14, 154 and 1438, respectively.…”

Section: Selection Of Optimal Five-frequency Geometry-free Phase Combinationsmentioning

confidence: 99%

Real-Time Cycle Slip Detection and Repair Method for BDS-3 Five-Frequency Data

Yuan

et al. 2021

IEEE Access

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Theoretically, five-frequency observations can form combined observations with longer wavelength, smaller ionospheric delay and smaller noise, which may improve the performance of cycle slip detection and repair. Four geometry-free phase combinations and one geometry-free phase and pseudorange combination are formed to detect and repair the cycle slips in real time. Firstly, the high-quality geometryfree phase combinations of three, four and five frequencies are discussed, then the optimal five-frequency geometry-free phase combinations are selected to detect the cycle slips. Secondly, one geometry-free phase and pseudorange combination which is linearly independent with the above four phase combinations is added to ensure that all the cycle slips can be detected. Thirdly, a real-time cycle slip repair algorithm based on the LAMBDA search method is deduced. The five-frequency real-time cycle slip detection and repair method has been tested by using BDS-3 undifferenced data, even under the condition of active ionospheric and low sampling interval. The results showed that the proposed method is capable of detecting and repairing all the simulated cycle slips on the five carriers in real time.INDEX TERMS Cycle slip detection and repair, BDS-3, five-frequency, geometry-free phase combination, geometry-free phase and pseudorange combination.

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“…Thus, the research of coseismic displacement retrieval is necessary. With the developments of the global navigation satellite system (GNSS), its service accuracy has become more precise, and the technical types have become varied [1][2][3][4][5], making it widely used in coseismic displacement retrieval and playing an important role in seismic warning [6][7][8][9]. It is also helpful for the extraction of post-earthquake information via remote sensing technology.…”

Section: Introductionmentioning

confidence: 99%

Assessment of the Feasibility of PPP-B2b Service for Real-Time Coseismic Displacement Retrieval

Yang

Weng

et al. 2021

Remote Sensing

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Traditional coseismic displacement retrieval generally uses real-time kinematic (RTK) and precise point positioning (PPP) services. However, both RTK and real-time PPP need a network link to transmit the corrected data. Although the network link may be interrupted when an earthquake happens, the PPP-B2b service broadcasted by geostationary orbit (GEO) satellites will not be affected. Its service range mainly covers China and the surrounding areas. In this research, the PPP method with PPP-B2b service based on constrained coordinates is proposed and overcomes the limitation of the network link and long convergence time. First, the accuracy of orbits and clock offsets for the PPP-B2b service is evaluated and compared with real-time service (RTS). Then, the simulated experiments are carried out using the PPP method with PPP-B2b service based on constrained coordinates, which tests the accuracy by calculating the coordinate displacement of the measurement station. The results show that the accuracy of PPP-B2b orbits in the radial direction is within 0.1 m. Moreover, regarding the accuracy of clock offsets, the PPP-B2b service is no more than 3.5 cm. This validates the feasibility of replacing RTS products with PPP-B2b. In the 15 min simulated experiments, the root mean square (RMS) of horizontal and vertical directions is maintained within 3 cm.

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Benefits of BDS-3 B1C/B1I/B2a triple-frequency signals on precise positioning and ambiguity resolution

Cited by 30 publications

References 21 publications

Research on Linear Combination Models of BDS Multi-Frequency Observations and Their Characteristics

Research on Linear Combination Models of BDS Multi-Frequency Observations and Their Characteristics

Real-Time Cycle Slip Detection and Repair Method for BDS-3 Five-Frequency Data

Assessment of the Feasibility of PPP-B2b Service for Real-Time Coseismic Displacement Retrieval

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