Precise estimation of residual tropospheric delays using a regional GPS network for real-time kinematic applications |
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Authors: | J. Zhang G. Lachapelle |
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Affiliation: | (1) Department of Geomatics Engineering, The University of Calgary, 2500 University Drive N.W., Calgary, AB T2N 1N4, Canada e-mail: lachapel@geomatics.ucalgary.ca; Tel.: +1- 403-220-5834; Fax: +1- 403-284-1980, CA |
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Abstract: | A new method called Trop_NetAdjust is described to predict in real time the residual tropospheric delays on the GPS carrier phase observables using the redundant measurements from a network of GPS reference stations. This method can not only enhance the effectiveness and reliability of real-time kinematic users within the network, but also provide a valid approach to tropospheric parameter variation forecasting. Trop_NetAdjust is theoretically based upon LS prediction criteria and enables the prediction of residual tropospheric delays remaining after a standard model has been applied to the raw GPS measurements. Two cases are analyzed, namely a first case when the delay is required for an existing satellite at a new point within the network and a second case when the delay is required for a new satellite. Field tests were conducted using data collected in a network of 11 reference stations covering a 400×600 km region in southern Norway. The results were analyzed in the measurement domain (ionospheric-free double-difference residuals) and showed improvements of 20 to 65% RMS errors using Trop_NetAdjust. The estimates of the Trop_NetAdjust prediction accuracy were also obtained using the covariance analysis method. The agreement was consistently better than 30% when compared with data from a real network. Received: 28 February 2000 / Accepted: 9 January 2001 |
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Keywords: | : GPS – Navigation – Real-time Kinematic Positioning – Meteorology – Ambiguitiy Resolution |
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