Observability Analysis of Opportunistic Navigation with Pseudorange Measurements
Zaher M. Kassas, Todd E. Humphreys · 2012
Opportunistic navigation (OpNav) aims to extract positioning and timing information from ambient radio-frequency “signals of opportunity” (SOPs). OpNav radio receivers continuously search for opportune signals from which to draw navigation and timing information, employing on-the-fly signal characterization as necessary. Signals from discovered SOPs are downmixed and sampled coherently, yielding a tight coupling between signal streams that permits carrier-phase-level fusion of observables from the various streams within a single or distributed state estimator.1, 2