Results of a Block II GPS Users Survey
DEPARTMENT OF DEFENSE FORT GEORGE G MEADE MD
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As part of a system development the authors were required to select appropriate standards and cost-effective techniques for time recovery and frequency control. It quickly became apparent that GPS offered a good across-the-board solution to the system requirements for 1 time recovery 2 synchrony 3 frequency control 4 syntony and 5 precise positioning. It was also apparent, with the advent of Block II, selective availability SA and anti-spoofing AS, that the performance of presently available time recovery receivers would potentially be inadequate to meet our system requirements. It was further evident that readily available, cost-effective receivers were not in the near-term plans of any of the contacted manufacturers. We therefore undertook to encourage the development and competitive availability of authorized user receivers capable of achieving the full time and frequency performance capabilities of GPS within the Block II environment. As part of that effort we reviewed our requirements with a representative set of receiver manufacturers. In addition, we distributed a questionnaire to over 1300 projected authorized users. This was an attempt to determine 1 the range of user requirements 2 the size of the potential market and 3 the degree of user interest in establishing an authorized user users group AUUG. This paper presents the results of the survey, reports on our progress in organizing the userworking group and briefly describes some of the concepts proposed to provide cost-effective solutions to the problem.
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