Zobrazeno 1 - 10
of 17
pro vyhledávání: '"Israel Kashani"'
Publikováno v:
Navigation. 55:225-234
"The National Geodetic Survey (NGS) operates the Online Positioning User Service (OPUS) as a means to provide the GPS users with easier access to the National Spatial Reference System (NSRS). OPUS allows the users to submit their GPS data files to NG
Publikováno v:
Survey Review. 39:238-251
The primary objective of this paper is to estimate the influence of the double-difference (DD) ionospheric corrections latency on the instantaneous (one-epoch) ambiguity resolution (AR) in longrange RTK under typical ionospheric conditions. The key t
Autor:
Douglas S. Robertson, Pawel Wielgosz, Paul S. J. Spencer, Dru A. Smith, Israel Kashani, Dorota A. Grejner-Brzezinska, Gerald L. Mader
Publikováno v:
Journal of Surveying Engineering. 133:56-65
Fast and reliable ambiguity resolution (AR) is particularly challenging in long-range real-time kinematic (RTK) global positioning system (GPS), since the atmospheric errors decorrelate with the increasing base-rover separation, effectively reducing
Autor:
Pawel Wielgosz, Attila Komjathy, Dru A. Smith, Israel Kashani, Douglas S. Robertson, Gerald L. Mader, Dorota A. Grejner-Brzezinska
Publikováno v:
Navigation. 53:203-217
Reliable modeling of ionospheric delays is one of the most challenging aspects of network-based real-time kinematic GPS. Various ionospheric models derived from global, regional, and local permanently tracking networks have been developed to support
Autor:
Israel Kashani
Publikováno v:
Journal of Surveying Engineering. 132:24-30
One of the possible uses of the global positioning satellite permanent stations is to use them as a datum reference when a new base station is established in a geodetic or surveying project. However, the actual procedure is not always obvious. Combin
Autor:
Israel Kashani
Publikováno v:
Survey Review. 38:412-422
The major problem with transforming from a classical to a satellite-based network is the typically low and heterogeneous accuracy of the classical network coordinates, especially in the height component. The accuracies and the statistical correlation
Publikováno v:
Navigation. 52:239-245
Instantaneous (single-epoch) ambiguity resolution may not always be possible because of the increasing noise and lack of sufficient redundancy to verify the integer selection in long-range real-time kinematic (RTK) GPS positioning. The algorithm prop
Publikováno v:
Journal of Geodesy. 79:524-531
The network-based GPS technique provides a broad spectrum of corrections to support RTK (real-time kinematic) surveying and geodetic applications. The most important among them are the ionospheric corrections generated in the reference network. The a
Publikováno v:
GPS Solutions. 9:212-225
The network-based approach to kinematic GPS positioning significantly increases the distance, over which carrier-phase ambiguity resolution can be performed. This can be achieved either by introducing geometric conditions based on the fixed reference
Autor:
Pawel Wielgosz, Dru A. Smith, Douglas S. Robertson, Paul S. J. Spencer, Gerald L. Mader, Dorota A. Grejner-Brzezinska, Israel Kashani
Publikováno v:
Journal of Global Positioning Systems. 3:115-131
The primary objective of this paper is to test several methods of modeling the ionospheric corrections derived from a reference GPS network, and to study the impact of the models’ accuracy on the user positioning results. The five ionospheric model