GPS and GLONASS Integration: Modeling and Ambiguity Resolution Issues

Wang, Jinling; Rizos, Chris; Stewart, Mary E.; Leick, Alfred

doi:10.1007/pl00012877

Cited by 51 publications

(26 citation statements)

References 17 publications

(19 reference statements)

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The difference between satellites is conventionally applied to eliminate the receiver clock biases of GPS observations. However, this method is inapplicable for GLONASS, because it does either not eliminate receiver clock biases or causes the loss of the integer nature of ambiguities (Wang et al 2001;AlShaery et al 2013). Thus, we use the SDBE method to resolve cycle slips when integrating GPS and GLONASS for cycle slip fixing.…”

Section: Methodsmentioning

confidence: 97%

A cycle slip fixing method with GPS + GLONASS observations in real-time kinematic PPP

Liu

Song

et al. 2015

GPS Solut

View full text Add to dashboard Cite

A key limitation of precise point positioning (PPP) is the long convergence time, which requires about 30 min under normal conditions. Frequent cycle slips or data gaps in real-time operation force repeated re-convergence. Repairing cycle slips with GPS data alone in severely blocked environments is difficult. Adding GLONASS data can supply redundant observations, but adds the difficulty of having to deal with differing wavelengths. We propose a single-difference between epoch (SDBE) method to integrate GPS and GLONASS for cycle slip fixing. The inter-system bias can be eliminated by SDBE, thus only one receiver clock parameter is needed for both systems. The inter-frequency bias of GLONASS satellites also cancels in the SDBE, so cycle slips are preserved as integers, and the LAMBDA method is adopted to search for cycle slips. Data from 7 days of 20 globally distributed IGS sites were selected to test the proposed cycle slip fixing procedure with artificial blocking of the signal; cycle slips were introduced for all unblocked satellites at each epoch. For a 30-s sampling interval, the average success rate of fixing can be improved from 73 to 98 % by adding GLONASS. Even for a 180-s sampling interval, GPS ? GLONASS can achieve a success rate of 81 %. A real-time kinematic PPP experiment was also performed, and the results show that using GPS ? GLONASS can achieve continuous high-accuracy real-time PPP without re-convergence.

show abstract

Section: Methodsmentioning

confidence: 97%

A cycle slip fixing method with GPS + GLONASS observations in real-time kinematic PPP

Liu

Song

et al. 2015

GPS Solut

View full text Add to dashboard Cite

show abstract

“…This technology uses a constellation of 31 satellites located in three orbital planes with 8 satellites each one [13]. The integration of GPS with GLONASS may be considered a major milestone in satellite-based positioning, because it can dramatically improve the reliability and productivity of indicated positioning [14].…”

Section: Gps -Glonass Technologymentioning

confidence: 99%

Drone Automation to Monitor and Aerial Surveillance on the Group for Special Air Transport - FAE

Bravo

Marcillo

Pereira

2017

Advances in Intelligent Systems and Computing

View full text Add to dashboard Cite

Abstract. Third dimension's exploitation facilitates a rapid and timely use of aerospace power. This is because, when using the airspace, free of significant obstacles; it is possible to operate with a greater degree of action. Aware of this reality, the current technology seeks to operate flight equipment autonomously and thus, obtain a greater advantage in time, space and financial resources. Aerial devices such as drones help to ground structures to have a better vision of their environment, with greater range and without the use of significant efforts. In this article, authors propose the use of an automated drone for the execution of aerial guard rounds at various military posts in a specific aerial base. This drone will be monitored by a mobile application manipulated by the guard-duty. The main goal of this research is to cover an area of military responsibility where exists aeronautical resources that need physical security, regardless of their geographical conditions, optimizing human, financial and time resources.

show abstract

“…Since the transformed DD-ambiguities have the integer nature, they can be fixed to integer as usually done for GPS (Blewitt 1989;Dong and Bock 1989;Wang et al 2001;Ge et al 2005).…”

Section: A T P a A T P D A T P C D T P D D T P C S Ym C T P Cmentioning

confidence: 99%

Particle filter-based estimation of inter-frequency phase bias for real-time GLONASS integer ambiguity resolution

Tian

Neitzel

2015

J Geod

View full text Add to dashboard Cite

GLONASS could hardly reach the positioning performance of GPS, especially for fast and real-time precise positioning. One of the reasons is the phase inter-frequency bias (IFB) at the receiver end prevents its integer ambiguity resolution. A number of studies were carried out to achieve the integer ambiguity resolution for GLONASS. Based on some of the revealed IFB characteristics, for instance IFB is a linear function of the received carrier frequency and L1 and L2 have the same IFB in unit of length, most of recent methods recommend estimating the IFB rate together with ambiguities. However, since the two sets of parameters are highly correlated, as demonstrated in previous studies, observations over several hours up to 1 day are needed even with simultaneous GPS observations to obtain a reasonable solution. Obviously, these approaches cannot be applied for real-time positioning. Actually, it can be demonstrated that GLONASS ambiguity resolution should also be available even for a single epoch if the IFB rate is precisely known. In addition, the closer the IFB rate value is to its true value, the larger the fixing RATIO will be. Based on this fact, in this paper, a new approach is developed to estimate the IFB rate by means of particle filtering with the likelihood function derived from RATIO. This approach is evaluated with several sets of experimental data. For both static and kinematic cases, the results show that IFB rates could be estimated precisely just with GLONASS data of a few epochs depending on the baseline length. The time cost with a normal PC can be controlled around 1 s and can be further reduced. With the estimated IFB rate, integer ambiguity resolution is available B Yumiao Tian immediately and as a consequence, the positioning accuracy is improved significantly to the level of GPS fixed solution. Thus the new approach enables real-time precise applications of GLONASS.

show abstract

GPS and GLONASS Integration: Modeling and Ambiguity Resolution Issues

Cited by 51 publications

References 17 publications

A cycle slip fixing method with GPS + GLONASS observations in real-time kinematic PPP

A cycle slip fixing method with GPS + GLONASS observations in real-time kinematic PPP

Drone Automation to Monitor and Aerial Surveillance on the Group for Special Air Transport - FAE

Particle filter-based estimation of inter-frequency phase bias for real-time GLONASS integer ambiguity resolution

Contact Info

Product

Resources

About