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Navigator GPS Receiver for Fast Acquisition and Weak Signal Space ApplicationsNASA Goddard Space Flight Center (GSFC) is developing a new space-borne GPS receiver that can operate effectively in the full range of Earth orbiting missions from Low Earth Orbit (LEO) to geostationary and beyond. Navigator is designed to be a fully space flight qualified GPS receiver optimized for fast signal acquisition and weak signal tracking. The fast acquisition capabilities provide exceptional time to first fix performance (TIFF) with no a priori receiver state or GPS almanac information, even in the presence of high Doppler shifts present in LEO (or near perigee in highly eccentric orbits). The fast acquisition capability also makes it feasible to implement extended correlation intervals and therefore significantly reduce Navigator s acquisition threshold. This greatly improves GPS observability when the receiver is above the GPS constellation (and satellites must be tracked from the opposite side of the Earth) by providing at least 10 dB of increased acquisition sensitivity. Fast acquisition and weak signal tracking algorithms have been implemented and validated on a hardware development board. A fully functional version of the receiver, employing most of the flight parts, with integrated navigation software is expected by mid 2005. An ultimate goal of this project is to license the Navigator design to an industry partner who will then market the receiver as a commercial product.
Document ID
Acquisition Source
Goddard Space Flight Center
Document Type
Preprint (Draft being sent to journal)
Winternitz, Luke
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Moreau, Michael
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Boegner, Gregory J.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Sirotzky, Steve
(QSS Group, Inc. United States)
Date Acquired
September 7, 2013
Publication Date
January 1, 2004
Subject Category
Instrumentation And Photography
Meeting Information
Meeting: ION GNSS 2004
Location: Long Beach, CA
Country: United States
Start Date: January 1, 2004
Distribution Limits
Work of the US Gov. Public Use Permitted.
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