Single-Epoch Navigation Performance with Real BDS Triple-Frequency Pseudorange and EWL/WL Observations

Abstract

Triple-frequency signals of China's BeiDou navigation satellite system (BDS) are now accessible in the Asia-Pacific region. It is well understood that the third frequency signal will improve the navigation performance. Some literatures have described several navigation methods by using triple-frequency signals, and evaluated the performance. However the experiments were mostly implemented on simulated or semi-simulated observations. In this paper we investigate the navigation performance using real BDS triple-frequency observations. Apart from the pseudorange observations, carrier observations are also used, since the extra-wide-lane and wide-lane ambiguities can be reliably resolved with a single epoch. Several single-epoch navigation methods using BDS triple-frequency observations are described and the corresponding navigation accuracy and reliability are assessed. Results show that P3 has the highest accuracy among the three pseudorange observations. For carriers, the wide-lane and extra-wide-lane observations can be used to obtain much higher navigation precision compared with pseudorange observations. Besides, the two ambiguity-fixed extra-wide-lane and wide-lane observations can also be combined to ionosphere-free form, which can still obtain sub-decimetre and decimetre navigation accuracy in horizontal and vertical directions respectively. K E Y WO R D S 1. BeiDou navigation satellite system (BDS).2. Single-epoch navigation.3. Triple-frequency observations. 4. Positioning reliability.

A Tightly Coupled BDS/INS Integrated Positioning Algorithm Based on Triple-Frequency Single-Epoch Observations

“…ϕ n and P n are the carrier-phase and pseudorange observations of the n-th frequency in the unit of meter. e geometry-free and ionosphere-free (GIF) model is used to calculate the ambiguity parameter of EWL [31].…”

“…where T, I, and ε are received by interpolation of area modelling of network RTK. Constants as η EWL � −0.352 and λ WL � 0.8470m are given in Gao's research [31]. e only unknown parameter is the double-differenced satellite-station geometry distance Δ∇ρ.…”

An Improved Single-Epoch GNSS/INS Positioning Method for Urban Canyon Environment Based on Real-Time DISB Estimation

“…Considering wavelength and noise amplification coefficient, the combination of (0, −1, 1) and (1, −1, 0) are the most suitable for EWL and WL of BDS [31]. On GPS side, (1,0, −1) has similar effect as (1, −1, 0) for WL combination [32].…”

Tightly combined triple-frequency GPS and BDS for rapid wide-lane RTK positioning with consideration of carrier-phase differential inter-system bias

“…Compared with the centimeter-level accuracy, they prefer the faster, more continuous and more reliable positioning and navigation performance. 15,16…”

“…Compared with the centimeter-level accuracy, they prefer the faster, more continuous and more reliable positioning and navigation performance. 15,16 When using the observations from different systems in RTK positioning, conventional intra-system model and the inter-system model are the two commonly used models. 17 If the differential inter-system biases (DISBs) can be handled properly, the inter-system model is beneficial to maximize the redundancy, and thus will be helpful for the positioning in severe observation environments where the satellite signals are easily blocked.…”