GPS, Galileo, QZSS and IRNSS differential ISBs: estimation and application

Odijk, Dennis; Nadarajah, Nandakumaran; Zaminpardaz, Safoora; Teunissen, Peter

doi:10.1007/s10291-016-0536-y

Cited by 97 publications

(58 citation statements)

References 10 publications

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“…For receivers of different manufacturers, although DISBs cannot be eliminated, their stability in time has been proven, and thus can be calibrated in advance. Using these characteristics, the obvious improvement of ambiguity resolution (AR) and positioning with calibrated DISBs for short and long baseline RTK have been verified, the details of which can be seen in [11,[13][14][15][16]. For the real-time estimation of DISBs and application for AR, Tian et al [12] proposed a particle filter-based method to estimate GPS L1-Galileo E1 phase DISBs based on the fact that the accuracy of a given DISB value can be qualified by the related fixing ratio.…”

Section: Introductionmentioning

confidence: 92%

“…In Equation (11), the estimable DD ambiguities ∆N 1 C q IF are still the intra-system ambiguities among BDS satellites. The difference between the inter-system model and the intra-system is the DISB terms, i.e., ∆δ IF,GC and ∆d IF,GC , which are eliminated in the intra-system model.…”

Section: Intra-system and Inter-system Observation Modelmentioning

confidence: 99%

“…The uncombined DISB estimation model with zero and ultra-short baselines can be easily derived by simplifying Equation (11). In order to test the variation of DISBs with time, the estimation is carried out epoch-by-epoch.…”

Section: Stability Analysis Of Disbsmentioning

confidence: 99%

“…This model will be called inter-system differencing in this paper. Using the inter-system differencing model can help to maximize the redundancy if the inter-system biases (ISBs) in range and phase observations can be handled properly [11]. This is essential for positioning in severe observation environments, such as urban areas where signals are easily blocked by high buildings or trees [8,12].…”

Section: Introductionmentioning

confidence: 99%

“…For the code DISB, it can be easily parameterized or corrected with a priori calibration due to the simplicity of the pseudorange equation. For the phase DISBs, if the a priori phase ISB information is precisely known, the inter-system DD ambiguities can also be fixed to integers for the overlapping frequencies between two systems (e.g., GPS L1 and Galileo E1) [11,13,14]. Odijk and Teunissen [13,15] found that the code and phase DISBs between two systems could be cancelled out for baselines with receiver pairs of the same manufacturer.…”

Section: Introductionmentioning

confidence: 99%

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Inter-System Differencing between GPS and BDS for Medium-Baseline RTK Positioning

Gao

Pan

et al. 2017

Remote Sensing

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An inter-system differencing model between two Global Navigation Satellite Systems (GNSS) enables only one reference satellite for all observations. If the associated differential inter-system biases (DISBs) are priori known, double-differenced (DD) ambiguities between overlapping frequencies from different GNSS constellations can also be fixed to integers. This can provide more redundancies for the observation model, and thus will be beneficial to ambiguity resolution (AR) and real-time kinematic (RTK) positioning. However, for Global Positioning System (GPS) and the regional BeiDou Navigation Satellite System (BDS-2), there are no overlapping frequencies. Tight combination of GPS and BDS needs to process not only the DISBs but also the single-difference ambiguity of the reference satellite, which is caused by the influence of different frequencies. In this paper, we propose a tightly combined dual-frequency GPS and BDS RTK positioning model for medium baselines with real-time estimation of DISBs. The stability of the pseudorange and phase DISBs is analyzed firstly using several baselines with the same or different receiver types. The dual-frequency ionosphere-free model with parameterization of GPS-BDS DISBs is proposed, where the single-difference ambiguity is estimated jointly with the phase DISB parameter from epoch to epoch. The performance of combined GPS and BDS RTK positioning for medium baselines is evaluated with simulated obstructed environments. Experimental results show that with the inter-system differencing model, the accuracy and reliability of RTK positioning can be effectively improved, especially for the obstructed environments with a small number of satellites available.

show abstract

Section: Introductionmentioning

confidence: 92%

Section: Intra-system and Inter-system Observation Modelmentioning

confidence: 99%

Section: Stability Analysis Of Disbsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Inter-System Differencing between GPS and BDS for Medium-Baseline RTK Positioning

Gao

Pan

et al. 2017

Remote Sensing

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GNSS Precise Point Positioning

Teunissen

2020

Position, Navigation, and Timing Technologies in the 21st Century

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Double difference method with zero and short base length carrier phase measurements for Navigation with Indian Constellation satellites L5 (1176.45 MHz) signal quality analysis

KCT¹,

Devanaboyina

Shaik³

2022

Satell Commun Network

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The carrier phase (CP) measurements should be unambiguous to achieve the enhanced accuracy of Global Navigation Satellite System (GNSS) services. However, all the real-time CP measurements are manipulated by different errors, namely, satellite and receiver clock error, ionosphere delay, troposphere delay, integer ambiguity, etc. Even after removing or minimizing all these errors, the CP measurements are influenced by multipath error and receiver hardware residual or bias. In this research article, a double difference (DD) method is proposed to estimate residual or bias in CP observations of Navigation with Indian Constellation (NavIC). The proposed method abolishes all the common errors and provides bias. However, the CP measurement with a bit of bias value can be considered a high-quality signal. Here, we investigate the quality of NavIC satellites L5 (1176.45 MHz) signal with real-time measurements obtained through zero base length (ZBL) and short base length (SBL) experiments conducted at Kurnool (15.79 N, 78.07 E), India. The results show that the CP measurement bias of the L5 signal is within the range ±0.338 and ±1.688 m, respectively, for stationary and moving receivers. The bias was enhanced to 3.71 m for the SBL measurements. The results also demonstrate that the bias is low when carrier to noise (C/No) is high, and its range is nearly the same for all the days. This research would be helpful to estimate the bias that improves accuracy of precise point positioning (PPP) applications.

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GPS, Galileo, QZSS and IRNSS differential ISBs: estimation and application

Cited by 97 publications

References 10 publications

Inter-System Differencing between GPS and BDS for Medium-Baseline RTK Positioning

Inter-System Differencing between GPS and BDS for Medium-Baseline RTK Positioning

GNSS Precise Point Positioning

Double difference method with zero and short base length carrier phase measurements for Navigation with Indian Constellation satellites L5 (1176.45 MHz) signal quality analysis

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