Abstract
Performance Of Static Positioning For Medium Distances Based On Data From A Virtual Reference Station And ASG-PL Network The use of a network of reference stations instead of a single reference station allows the modelling of some systematic errors in a region and allows a user to increase the distance between the rover receiver and reference stations. In some countries, GPS reference stations exist and GPS observations are available for users in real-time mode and in postprocessing. Observations from several GPS reference stations in a regional network enable modelling spatially-correlated errors and their modelling on an epoch-by-epoch and satellite-by-satellite basis. As a result, observations of a virtual reference station can be created at a rover's approximate position and its observations can be used in the precise baseline positioning of the rover. This paper presents the performance of the static positioning of a rover station, its quality and reliability for two different baselines. Single-baseline and network static solutions are presented and compared. Network solutions are based on data from a virtual reference station (VRS) obtained by the Wasoft/Virtuall software. In both cases, the same strategy of ambiguity resolution was used. These approaches have been tested with the use of 24-hour GPS data from the Polish Active Geodetic Network (ASG-PL). The data from three reference stations with medium-range separation were used in the process of generating VRS data. GPS data of the rover station were divided into 20, 10 and 5-min. sessions with a sampling interval of 5 sec. Practical calculations and analyses of horizontal and vertical accuracy of coordinates clearly show the improvement of static positioning in terms of time observation span and ambiguity reliability.
Highlights
With the establishment of active GPS reference networks with station distances of about one hundred kilometres or more, a new era of centimetre positioning has begun
Short-time static GPS positioning has been investigated based on the data from a virtual reference station and data from dual frequencies GPS receivers
Test data from an ASG-PL network were used to evaluate the performance of static positioning with the use of virtual reference station (VRS) data
Summary
With the establishment of active GPS reference networks with station distances of about one hundred kilometres or more, a new era of centimetre positioning has begun. Precise correction models for dispersive (ionospheric) and non-dispersive (tropospheric and orbit) distance-dependent biases are obtained from the real reference data and used in the virtual observation calculations. The user can transmit his approximate position to the central computing facility and by return he receives VRS observations based on the real RS data and the correction models (Euler et al, 2001; Landau et al, 2002) This concept has several advantages and allows observation errors to be reduced by error modelling in the network. Several processing steps have to be performed in order to transform the carrier phase observations of the network of real reference stations to carrier phase observations of a virtual reference station (Wanninger, 1997) They include the resolution and removal of doubledifference carrier phase ambiguities. WaSoft/Virtuell uses the Receiver Independent Exchange Format (RINEX) as output format so that one can use any available post-processing software for GPS positioning
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