SpaceRef - Astronautics - Guidance And Tracking

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SpaceRef - Astronautics - Guidance And Tracking

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International GPS Service for Geodynamics (IGS) - IGS, along with a multinational membership of organizations and agencies, provides GPS orbits, tracking data, and other high-quality GPS data and data products on line in near real time to meet the objectives of a wide range of scientific and engineering applications and studies. [NASA Jet Propulsion Laboratory]

JPL Frequency Standards Laboratory - The Frequency Standards Laboratory houses NASA's Lead Center for Frequency and Time. The Laboratory supplies NASA's Deep Space Network (DSN) with the hardware, expertise and technology for state-of-the-art frequency standards, clocks, distribution networks, and time synchronization to enable deep space navigation and advanced radio science experiments. [NASA Jet Propulsion Laboratory]

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