The Service Volume Model Its Philosophy and Implementation

Rajendra Malla and Jiun-Tsong Wu

Abstract:	Raytheon has successfully delivered the Phase 1 Service Volume Model (SVM) for the FAAÕs Wide Area Augmentation System (WAAS). This paper presents the philosophy behind the SVM design and development. One of the main objectives of the SVM is to compute system availability for navigation over a planned service volume. A navigation system is considered available all the specified requirements for navigation accuracy, integrity and continuity of service are met. Availability is computed for both en-route and precision approach based upon the a-priori statistical representations system performance. The SVM can conduct sensitivity analyses with respect to system architecture design changes and can help derive necessary system requirements. Currently, the SVM is being used to carry out system performance analyses under various scenarios. The SVM is designed to be consistent with the operational WAAS, but it is flexible enough to provide coverage over any desired service volume on the globe for any wide area differential GPS (WADGPS). Examples are presented here to demonstrate how the SVM can be used to analyze multiple system availability issues.
Published in:	Proceedings of the 11th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1998) September 15 - 18, 1998 Nashville, TN
Pages:	131 - 146
Cite this article:	Malla, Rajendra, Wu, Jiun-Tsong, "The Service Volume Model Its Philosophy and Implementation," Proceedings of the 11th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1998), Nashville, TN, September 1998, pp. 131-146.
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