This paper describes a system concept, algorithmic overview and preliminary performance estimation for a proposed Autonomous Navigation System (ANS) enhancement to the Global Positioning System (GPS). The current GPS control segment forms satellite-to-ground station measurements which are processed by a Master Control Station (MCS) into uploaded prediction parameters. Uploads are performed thrice daily. This architecture relies upon ground resources and is therefore vulnerable to attack. The ANS would maintain navigation accuracy for six months after losing all ground resources, greatly enhancing survivability and relieving the routine upload requirement. The ground segment maintains six months of ephemeris prediction parameters in satellite memory. Onboard processors use crosslink measurements to synchronize the satellite clocks and improve the ephemeris predictions. The simulation results are surprisingly good, both maintaining specification accuracy for six months and exhibiting considerable robustness.
Autonomous navigation for GPS via crosslink ranging
Autonome Navigation des GPS mit Querverbindungs-Entfernungsmessungen
1986
4 Seiten, 2 Quellen
Aufsatz (Konferenz)
Englisch
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