A New Approach for Field Calibration of Absolute GPS Antenna Phase Center Variations

Wübbena, Gerhard; Schmitz, Martin; Menge, Falko; Seeber, Günter; Völksen, Christof

doi:10.1002/j.2161-4296.1997.tb02346.x

Cited by 55 publications

(51 citation statements)

References 2 publications

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“…Such corrections are published by the International GNSS Service (IGS; Dow et al 2009) for more than 200 antenna types (Schmid 2016). Originating from field calibrations they are considered to be accurate on the subcentimeter level (Wübbena et al 1997(Wübbena et al , 2006Mader 1999).…”

Section: Carrier Phase Corrections For Satellite and Receiving Antennasmentioning

confidence: 99%

Group delay variations of GPS transmitting and receiving antennas

Wanninger

Sumaya-Martinez

Beer

2017

J Geod

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GPS code pseudorange measurements exhibit group delay variations at the transmitting and the receiving antenna. We calibrated C1 and P2 delay variations with respect to dual-frequency carrier phase observations and obtained nadir-dependent corrections for 32 satellites of the GPS constellation in early 2015 as well as elevationdependent corrections for 13 receiving antenna models. The combined delay variations reach up to 1.0 m (3.3 ns) in the ionosphere-free linear combination for specific pairs of satellite and receiving antennas. Applying these corrections to the code measurements improves code/carrier single-frequency precise point positioning, ambiguity fixing based on the Melbourne-Wübbena linear combination, and determination of ionospheric total electron content. It also affects fractional cycle biases and differential code biases.

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Section: Carrier Phase Corrections For Satellite and Receiving Antennasmentioning

confidence: 99%

Group delay variations of GPS transmitting and receiving antennas

Wanninger

Sumaya-Martinez

Beer

2017

J Geod

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“…Wanninger (1999) has shown that the performance of ambiguity resolution can be enhanced by regional modelling of the ionospheric error. Another field of interest will be antenna phase centre variations and calibration of these offsets (Wuebbena, 1996b;Menge, 1998;Geiger, 1998). The installation of reference stations will continue and within the next months further networks will be linked together.…”

Section: Discussionmentioning

confidence: 99%

Experiences in set-up and usage of a geodetic real-time differential correction network

Martín

Jahn²

2014

Earth Planet Sp

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Global Navigation Satellite Systems (GNSS) are commonly used for geodetic and land surveying applications. The stand alone accuracy provided by these GNSS are insufficient for the majority of these operations (GPS, 1995), therefore some form of differential correction method is required. Accordingly, the state survey offices of Germany have installed a differential correction service for geodetic applications. Code-and phase-corrections are broadcast in the VHF-band using the RTCM V2.1 format (RTCM, 1994). One major problem is that the accuracy depends on the distance to a reference station (length of baseline) because of residual orbit and atmospheric biases. To achieve a more precise solution, a number of reference stations are connected together to form a network. Within this network these influences are computed and a set of "area correction parameters" are also transmitted in RTCM message Type 59. Field trials and measurements have confirmed the high accuracy of this service. This paper describes the system itself, investigations of communication methods as well as site planning. In addition measurements from field trials will be presented to demonstrate the high accuracy in a real-time environment.

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“…In order to calculate the unit vectors every second for the previous day, the coordinates of satellites are interpolated. When the searches of the closest unit vectors are accomplished for all epochs, the estimates of MRT are derived according to Equation (5). Mean and STD of MRT estimates of all 96 epochs for each satellite are computed.…”

Section: Aspect Repeat Time Adjustment (Arta)mentioning

confidence: 99%

“…Based on this time-domain repeatability, Bock et al [3,4] proposed a method named sidereal filtering to mitigate multipath error for static GPS positioning. Sidereal filtering has been well developed and widely applied (e.g., [5][6][7][8][9][10][11][12][13][14][15]). The general principle of sidereal filtering is the construction of a multipath correction model from the residuals of coordinates or observables of the previous day(s), then the correction of the data of the subsequent day(s) by subtracting the corresponding correction value for each epoch.…”

Section: Introductionmentioning

confidence: 99%

“…Wübbena et al [5] found that the repeat time of GPS satellite was not equal to an exact sidereal day (23 h 56 min 04 s), and there was a bias of several seconds between the repeat time of GPS constellation and a sidereal day. Hence, if a sidereal day is adopted as a multipath repeat time (MRT), the inaccuracy of several seconds will affect the multipath reduction of sidereal filtering.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Comparison of Three Methods for Estimating GPS Multipath Repeat Time

Wang

Dong

et al. 2018

Remote Sensing

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Abstract:Sidereal filtering is an effective method for mitigating multipath error in static GPS positioning. Using accurate estimates of multipath repeat time (MRT) in sidereal filtering can further improve the performance of the filter. There are three commonly used methods for estimating the MRT: Orbit Repeat Time Method (ORTM), Aspect Repeat Time Adjustment (ARTA), and Residual Correlation Method (RCM). This study utilizes advanced sidereal filtering (ASF) adopting the MRT estimates derived by the three methods to mitigate the multipath in observation domain, then evaluates the three methods in term of multipath reduction in both coordinate and observation domain. Normally, the differences between the MRT estimates from the three methods are less than 1.2 s on average. The three methods are basically identical in multipath reduction, with RCM being slightly better than the other two methods, whereas for a satellite affected by orbit maneuver (satellite number 13 in this study), the MRT estimated by the three methods differ by up to tens of seconds, and the RCM-and ARTA-derived MRT estimates are better than ORTM-derived ones for ASF multipath reduction. The RCM shows a slight advantage in multipath mitigation, while ORTM is the one of lowest computation and ARTA is the optimal one for real-time ASF. Thus, the best MRT estimation method for practical applications depends on which criterion overweighs the others.

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A New Approach for Field Calibration of Absolute GPS Antenna Phase Center Variations

Cited by 55 publications

References 2 publications

Group delay variations of GPS transmitting and receiving antennas

Group delay variations of GPS transmitting and receiving antennas

Experiences in set-up and usage of a geodetic real-time differential correction network

Comparison of Three Methods for Estimating GPS Multipath Repeat Time

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