{ "item_title" : "Introduction to Global Navigation Satellite System", "item_author" : [" Michael Moreau", "Nasa Technical Reports Server (Ntrs) "], "item_description" : "This viewgraph presentation reviews the fundamentals of satellite navigation, and specifically how GPS works. It presents an overview and status of Global Positioning System, for both the current GPS, and plans to modernize it in the future. There is also a overview and status of other Global Navigation Satellite System (GNSS), specifically GLONASS, Galileo, and QZSS. There is also a review of Satellite based time transfer techniques. The topic is of interest to the Time and Frequency Community, because the Global Positioning system has become the primary system for distributing Time and frequency globally, and because it allows users to synchronize clocks and calibrate and control oscillators in any location that has a GPS antenna.", "item_img_path" : "https://covers4.booksamillion.com/covers/bam/1/28/928/403/1289284032_b.jpg", "price_data" : { "retail_price" : "17.75", "online_price" : "17.75", "our_price" : "17.75", "club_price" : "17.75", "savings_pct" : "0", "savings_amt" : "0.00", "club_savings_pct" : "0", "club_savings_amt" : "0.00", "discount_pct" : "10", "store_price" : "" } }

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