Network Code DGNSS Positioning for Faster L1–L5 GPS Ambiguity Initialization

Bakuła, Mieczysław; Uradziński, Marcin; Krasuski, Kamil

doi:10.3390/s20195671

Cited by 4 publications

(3 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Although the value ω(t) can be calculated using only a double-difference (DD) observation for a pair of satellites (Equation ( 11)), the most accurate ω(t) is obtained using double differenced geometric distance (Equation ( 10)) based on code relative or differential GNSS positioning based on Kalman filter and network code DGNSS solutions [22,23].…”

Section: Double-differenced Gps Data Equations and The Correlation Of Geometry-free Ambiguitiesmentioning

confidence: 99%

Instantaneous Ambiguity Reinitialization and Fast Ambiguity Initialization for L1-L2 GPS Measurements

Bakuła¹

2020

Sensors

Self Cite

View full text Add to dashboard Cite

This paper presents a PREcise and Fast Method of Ambiguity Reinitialization/Resolution (PREFMAR) for L1 and L2 in GPS measurements. The method determines NL1 and NL2 ambiguities based on the ambiguity functions: Ψ(NL1)NL1NL2 and Ψ(NL2)NL2NL1. These ambiguity functions have been described in detail in this work. The developed method of ambiguity initialization and reinitialization in relative positioning can use Global Positioning System (GPS) measurements from only two satellites and one measurement epoch. To resolve NL1 and NL2 ambiguities, a variance-covariance (VC) matrix of the float solution is not needed. The size of the search area in the PREFMAR method depends on code and phase accuracy as well as on the GNSS signal frequencies. Therefore, the search area is specific for every double or triple Global Navigation Satellite Systems (GNSS) data frequency. However, this part of the research only presents the ambiguity search area for L1 and L2 of GPS measurements. Additionally, a numerical example has been analyzed in detail with the use of the PREFMAR method and a float solution (NL1, NL2). Finally, the elaborated algorithms were successfully tested on real L1 and L2 GPS measurements for instantaneous ambiguity reinitialization. The PREFMAR method allows instantaneous ambiguity reinitialization if all satellites lose contact with a GNSS antenna, for short and long baselines. Therefore, the PREFMAR has a great potential for precise real-time kinematic GNSS navigation.

show abstract

Section: Double-differenced Gps Data Equations and The Correlation Of Geometry-free Ambiguitiesmentioning

confidence: 99%

Instantaneous Ambiguity Reinitialization and Fast Ambiguity Initialization for L1-L2 GPS Measurements

Bakuła¹

2020

Sensors

Self Cite

View full text Add to dashboard Cite

show abstract

“…It was also often combined with the replacement of technical equipment with newer solutions and also had an effect on the DGPS positioning accuracy. When observing the DGPS development trends, it can be concluded that the main current directions of research into this system include the use of DGPS methods in multi-system receivers [11][12][13], the development of network methods to improve accuracy and reliability [14], GNSS differential method mobile applications [15], and the application of DGPS methods in air navigation [16].…”

Section: Introductionmentioning

confidence: 99%

Maritime DGPS System Positioning Accuracy as a Function of the HDOP in the Context of Hydrographic Survey Performance

Specht¹

2022

Remote Sensing

View full text Add to dashboard Cite

The Differential Global Positioning System (DGPS) is a marine navigation system operating at frequencies of 283.5–325 kHz, which is now the primary method for locating vessels in coastal shipping, as well as hydrography and mapping systems worldwide. Its positioning accuracy is determined by the following: the pseudorange error to Global Positioning System (GPS) satellites, the age of pseudorange corrections, and the value of the Horizontal Dilution Of Precision (HDOP), which, in terms of accuracy, is crucial in positioning using GPS satellites. In 2020, the International Hydrographic Organization (IHO) introduced a new (the highest) order of hydrographic surveys, i.e., the Exclusive Order, which requires a positioning system to provide an accuracy of 1 m (p = 0.95). The aim of this article is to provide an answer to the question as to whether the maritime DGPS system, whose positioning accuracy is constantly increasing with that of the GPS system, fulfils the requirements for the hydrographic surveys of harbours. To this end, an extensive experimental study on the maritime DGPS system, involving a total of nearly 3.5 million fixes, was conducted. Statistical analyses showed that when ensuring the HDOP values range from 0.8 to 1.4, the DGPS system can be used in hydrographic surveys of harbours.

show abstract

“…GNSS satellite technology allows the user to determine the position of the aircraft using absolute and differential methods [4]. Within the presented work, the Differential DGPS (Differential GPS) method [5] in the GPS (Global Positioning System) satellite system will be discussed. In the differential DGPS technique, the location of the base stations relative to the mobile on-board GPS receiver mounted in the aircraft plays a key role [6].…”

Section: Introductionmentioning

confidence: 99%

A New Strategy for Improving the Accuracy of Aircraft Positioning Using DGPS Technique in Aerial Navigation

Krasuski¹,

Popielarczyk

Ciećko

et al. 2021

Energies

Self Cite

View full text Add to dashboard Cite

In this paper a new mathematical algorithm is proposed to improve the accuracy of DGPS (Differential GPS) positioning using several GNSS (Global Navigation Satellites System) reference stations. The new mathematical algorithm is based on a weighting scheme for the following three criteria: weighting in function of baseline (vector) length, weighting in function of vector length error and weighting in function of the number of tracked GPS (Global Positioning System) satellites for a single baseline. The algorithm of the test method takes into account the linear combination of the weighting coefficients and relates the position errors determined for single baselines. The calculation uses a weighting scheme for three independent baselines denoted as (1A,2A,3A). The proposed research method makes it possible to determine the resultant position errors for ellipsoidal BLh coordinates of the aircraft and significantly improves the accuracy of DGPS positioning. The analysis and evaluation of the new research methodology was checked for data from two flight experiments carried out in Mielec and Dęblin. Based on the calculations performed, it was found that in the flight experiment in Mielec, due to the application of the new research methodology, DGPS positioning accuracy improved from 55 to 94% for all the BLh components. In turn, in the flight experiment in Dęblin, the accuracy of DGPS positioning improved by 63–91%. The study shows that the highest DGPS positioning accuracy is seen when using weighting criterion II, the inverse of the square of the vector length error.

show abstract

Network Code DGNSS Positioning for Faster L1–L5 GPS Ambiguity Initialization

Cited by 4 publications

References 31 publications

Instantaneous Ambiguity Reinitialization and Fast Ambiguity Initialization for L1-L2 GPS Measurements

Instantaneous Ambiguity Reinitialization and Fast Ambiguity Initialization for L1-L2 GPS Measurements

Maritime DGPS System Positioning Accuracy as a Function of the HDOP in the Context of Hydrographic Survey Performance

A New Strategy for Improving the Accuracy of Aircraft Positioning Using DGPS Technique in Aerial Navigation

Contact Info

Product

Resources

About