Design & Test

Innovation: Spacecraft Navigator

April 1, 2006By
Figure 1: GPS signal reception at GEO and HEO orbital altitudes.

Autonomous GPS Positioning at High Earth Orbits
To initially acquire the GPS signals, a receiver also would have to search quickly through the much larger range of possible Doppler shifts and code delays than those experienced by a terrestrial receiver. read more

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Innovation: Satellite Navigation Evolution: The Software GNSS Receiver (PDF)

January 1, 2005By

Innovation: Satellite Navigation Evolution: The Software GNSS Receiver (PDF) By Glenn MacGougan, Peter Ludvig Normark, and Christian Stahlberg Published: January 2005 GPS World In this month’s Innovation, we look at a further evolution of the GNSS receiver which offers the promise of flexibility, adaptability, and cost-effectiveness.—Richard Langley read more