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This lecture explores the use of GNSS for space applications, including navigation in space, low-cost solutions, and real-time applications. It covers examples such as precise orbit determination, formation flying, on-orbit servicing, and debris removal. The lecture delves into the different altitudes in space, from GEO to LEO, and discusses the interoperable systems for space services. It also touches on the challenges and opportunities of using GNSS for space missions, such as precise orbit determination in LEO. Additionally, it examines the potential of real-time POD in LEO through GNSS orbit and clock corrections, as well as the concept of Doppler positioning for unique Earth surface positioning from satellite measurements.
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