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- W2506165060 abstract "The United States Department of Defense (DoD) Navy Navigation Satellite System (NNSS), commonly known as Transit, has been used extensively since 1967 for civilian geodetic surveying and navigation. With the advent of the Global Positioning System (GPS), the DoD will have no further need for Transit and plans to shut down the system in 1994. GPS receivers are still expensive and Transit Doppler receivers purchased today, according to the planned schedule, would have a limited life span of less than ten years. In this paper we present an economical method of acquiring the capabilities of modern Transit receivers by upgrading a popular old receiver. We have interfaced a standard Apple II microcomputer to a Canadian Marconi CMA-722B. The Apple microcomputer provides the added data processing and storage capability found in more modern Doppler receivers and obviates the need for “user unfriendly paper tape or expensive data cassettes. Dubbed “UNBSAT”, our system allows established survey organizations to expand their Transit positioning capabilities by reactivating their moth-balled CMA-722B receivers, allows developing nations to carry out Doppler surveys economically, and provides an educational tool for training surveying engineers in satellite positioning techniques. The hardware and software configuration of this system is described and an outline of its capabilities is given. The direction of current and future development of the system is also discussed." @default.
- W2506165060 created "2016-08-23" @default.
- W2506165060 creator A5070734996 @default.
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- W2506165060 date "1986-06-01" @default.
- W2506165060 modified "2023-09-26" @default.
- W2506165060 title "UNBSAT: A Digital Recording System for the CMA-722B Transit Doppler Receiver" @default.
- W2506165060 doi "https://doi.org/10.1139/tcs-1986-0014" @default.
- W2506165060 hasPublicationYear "1986" @default.
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