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Modifying the stochastic model to mitigate GPS systematic errors in relative positioning
(2007-12-01)
The GPS observables are subject to several errors. Among them, the systematic ones have great impact, because they degrade the accuracy of the accomplished positioning. These errors are those related, mainly, to GPS ...
GPS ambiguity resolution and validation under multipath effects: Improvements using wavelets
(2007-12-01)
Integer carrier phase ambiguity resolution is the key to rapid and high-precision global navigation satellite system (GNSS) positioning and navigation. As important as the integer ambiguity estimation, it is the validation ...
An effective wavelet method to detect and mitigate low-frequency multipath effects
(2008-12-01)
To ensure high accuracy results from GPS relative positioning, the multipath effects have to be mitigated. Although the careful selection of antenna site and the use of especial antennas and receivers can minimize multipath, ...
Latest Enhancements in the Brazilian Active Control Network
(2009-12-01)
The Brazilian Network for Continuous Monitoring of GPS - RBMC, since its foundation in December of 1996, has been playing an essential role for the maintenance and user access of the fundamental geodetic frame in the ...
Multipath reduction from GPS double differences using wavelets: How far can we go?
(2004-12-01)
Wavelets are being extensively used in Geodetic applications. In this paper, the Multi-Resolution Analysis (MRA) using wavelets is applied to pseudorange and carrier phase GPS double differences (DDs) in order to reduce ...
The impact of adding SBAS data on GPS data processing in southeast of Brazil: Preliminary result
(2012-12-01)
Nowadays, L1 SBAS signals can be used in a combined GPS+SBAS data processing. However, such situation restricts the studies over short baselines. Besides of increasing the satellite availability, SBAS satellites orbit ...
Integration of a regional GPS network within ITRF using precise point positioning
(Springer, 2002-01-01)
GPS precise point positioning (PPP) can provide high precision 3-D coordinates. Combined pseudorange and carrier phase observables, precise ephemeris and satellite clock corrections, together with data from dual frequency ...
Second and Third Order Ionospheric Effects on GNSS Positioning: A Case Study in Brazil
(Springer-verlag Berlin, 2012-01-01)
The Global Positioning System (GPS) transmits signals in two frequencies. It allows the correction of the first order ionospheric effect by using the ionosphere free combination. However, the second and third order ionospheric ...
Modernization and new services of the Brazilian active control network
(2012-12-01)
The Brazilian Network for Continuous Monitoring of GNSS - RBMC is a national network of continuously operating reference GNSS stations. Since its establishment in December of 1996, it has been playing an essential role for ...
ProGriD: The transformation package for the adoption of SIRGAS2000 in Brazil
(2012-12-01)
Brazil adopted SIRGAS2000 in 2005. This adoption called for the provision of the relationships between SIRGAS2000 and the previous reference frames used for positioning, mapping and GIS, namely, the Córrego Alegre (CA) and ...