NASA NTRS · 19790019993
The REFSAT approach to low-cost GPS terminals
Abstract
A concept utilizing a geostationary reference satellite (REFSAT) that broadcasts navigation aiding signals to low cost civil user terminals which employ the constellation of 24 NAVSTAR Global Positioning System (GPS) satellites for position determination is described. The signal acquisition, tracking and position fixing properties of such low cost, dual channel, L-band, civil user receiver designed to receive both GPS navigation and REFSAT navigation aiding signals is presented. REFSAT reduces the cost of user equipment.
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Sennott, J. W., Choudhury, A. K., Taylor, R. E.. 1979-04-01. The REFSAT approach to low-cost GPS terminals. https://ntrs.nasa.gov/citations/19790019993
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