An approach for instantaneous ambiguity resolution for medium- to long-range multiple reference station networks

Hu, G.; Abbey, D. A.; Castleden, N.; Featherstone, Will; Earls, Christopher J.; Øvstedal, O.; Weihing, Diana

doi:10.1007/s10291-004-0120-8

Cited by 42 publications

(23 citation statements)

References 20 publications

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“…Multi-baseline positioning with external ionospheric and geometric corrections can be regarded an extremely effective method of positioning in terms of accuracy, reliability, and session length. GBAS systems that support satellite positioning are based on this concept and are widely used (Hu et al 2005;Bosy et al 2007;Kashani et al 2008).…”

Section: Methodsmentioning

confidence: 99%

“…Precise single-epoch positioning is particularly vulnerable to the number of received signals and their quality. A reliable ambiguity resolution based on single-epoch data, in comparison with the on-thefly approach, is an extremely difficult and challenging task due to the low number of observations and the lack of change in satellite geometry (Hu et al 2005, Cellmer et al 2010Paziewski et al 2013). Thus, current positioning algorithms use ionospheric and tropospheric corrections derived from reference networks.…”

Section: Introductionmentioning

confidence: 99%

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Assessment of GPS + Galileo and multi-frequency Galileo single-epoch precise positioning with network corrections

Paziewski

Wielgosz

2013

GPS Solut

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Several processing strategies that use dual-frequency GPS-only solution, multi-frequency Galileo-only solution, and finally tightly combined dual-frequency GPS ? Galileo solution were tested and analyzed for their applicability to single-epoch long-range precise positioning. In particular, a multi-system GPS ? Galileo solution was compared to GPS double-frequency solution as well as to Galileo double-, triple-, and quadruple-frequency solutions. Also, the performance of the strategies was analyzed under clear-sky and obstructed satellite visibility in both single-baseline and multi-baseline modes. The results indicate that tightly combined GPS ? Galileo instantaneous positioning has a clear advantage over single-system solutions and provides an accurate and reliable solution. It was also confirmed that application of multi-frequency observations in case of Galileo system has an advantage over a dual-frequency solution.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Assessment of GPS + Galileo and multi-frequency Galileo single-epoch precise positioning with network corrections

Paziewski

Wielgosz

2013

GPS Solut

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“…At this point, it should be noted that dual-frequency observations allow elimination of the first order of ionospheric refraction through the ionospherefree combination. On the other hand, the resulting ambiguity term is no longer an integer value, and this solution can be considered only as float one (Hofmann-Wellenhof et al 2001).…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, the scientific community has put extensive effort into the development of new algorithms for ionospheric delay mitigation in precise rapid positioning. These advances have led to the development of a geometry-based ionosphere-weighted model supported with network-derived ionospheric corrections (Teunissen 1997;Odijk 2000a, b;Julien et al 2004;Hu et al 2005;Wielgosz 2010;Paziewski and Wielgosz 2014). This approach, often performed in the multi-baseline mode, allows reliable positioning even up to several tens of kilometers.…”

Section: Introductionmentioning

confidence: 99%

Study on reliable GNSS positioning with intense TEC fluctuations at high latitudes

Sieradzki

Paziewski

2015

GPS Solut

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The study presents the influence of strong total electron content (TEC) fluctuations occurring at high latitudes on rapid static positioning. The authors propose an algorithm mitigating the impact of dynamic temporal changes in electron content using the rate of TEC corrections. It consists of modifying the observations using the measured rate of TEC variations and hence allows reducing the number of parameters to one ionospheric delay of a reference epoch per satellite and per session. An analysis was carried out for a typical quiet day in solar minimum on September 6, 2009 and a disturbed day during high solar activity on March 17, 2013. For a standard geometry-based relative model with weighted ionosphere and troposphere, the results confirmed the dramatic drop of ambiguity resolution efficiency during a violent space weather event. The results obtained for the new algorithm, however, demonstrate its wide applicability and a 10-fold improvement in ambiguity success rate during the disturbed day.

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“…Dai et al (2003) and Chen et al (2004) introduced the techniques for real-time integer ambiguity resolution using atmospheric delay derived from the system initialization process and the atmospheric biases estimated from previous epochs. Hu et al (2005) proposed an ionosphere-weighted measurement model for instantaneous network ambiguity resolution with medium-to long-range receiver separations (30 km * 130 km).…”

mentioning

confidence: 99%

Algorithms for Sparse Network-based RTK GPS Positioning and Performance Assessment

et al. 2013

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The average inter-station distances in most established network Real Time Kinematic (RTK) systems are constrained to around 50 km. A sparse network RTK system with an average inter-station distance of up to 300 km would have many appealing advantages over a conventional one, including a significant reduction in the development and maintenance costs. The first part of this paper introduces the key approaches for sparse network RTK positioning technology. These include long-range reference baseline ambiguity resolution and real-time kinematic ambiguity resolution for the rover receivers. The proposed method for long-range kinematic ambiguity resolution can overcome the network weaknesses through three procedures: application of the interpolated corrections from the sparse network only to wide-lane combination; searching the ambiguities of wide-lane combination; and searching L1 ambiguities with wide-lane combination and ionosphere-free observables. To test these techniques, a network including ten reference stations was created from the Ordnance Survey's Network (OS Net TM ) that covers the whole territory of the United Kingdom (UK). The average baseline length of this sparse network is about 300 km. To assess the positioning performance, nine rover stations situated inside and outside the network were also selected from the OS Net™. Finally, the accuracy of interpolated corrections, the positioning accuracy and the initialization time required for precise positioning were estimated and analysed. From the observed performance of each rover receiver, and the accuracy of interpolated network corrections, it can be concluded that it is feasible to use a sparse reference station network with an average inter-station distance up to 300 km for achieving similar performance to traditional network RTK positioning. The proposed approach can provide more cost-efficient use of network RTK (NRTK) positioning for engineering and environmental applications that are currently being delivered by traditional network RTK positioning technology. K E Y WO R D S 1. OS Net™.2. Sparse Network-based RTK. 3. Ambiguity Resolution 4. Network Corrections.

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An approach for instantaneous ambiguity resolution for medium- to long-range multiple reference station networks

Cited by 42 publications

References 20 publications

Assessment of GPS + Galileo and multi-frequency Galileo single-epoch precise positioning with network corrections

Assessment of GPS + Galileo and multi-frequency Galileo single-epoch precise positioning with network corrections

Study on reliable GNSS positioning with intense TEC fluctuations at high latitudes

Algorithms for Sparse Network-based RTK GPS Positioning and Performance Assessment

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