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Today, it appears that the Cospas-Sarsat MEOSAR system, relying on payloads deployed on GNSS constellations (Galileo, GPS, GLONASS), offers all the conditions to meet the new recommendation of ICAO for ADT-system for Commercial Aviation, with a new generation of in-flight triggered beacons, identical to the current ELT in terms of aircraft integration, but capable of receiving triggers and cancellation events from the avionics, from the crew or from internal sensors, and of detecting and managing their inhibitions to maintain the capability to raise alerts and be localized in any situation.
Recent presentations and publications have suggested that multi-frequency spoofing is infeasible using low-cost, off-the-shelf equipment, and that a good defense against any but well-funded and technically competent adversaries would be to use a multi-frequency capable survey grade receiver. The authors of this article wish to demonstrate that this is definitively false.
Over at least half a dozen years the GPS III Follow On program has taken a number of dramatic turns only to wind up, in true soap opera fashion, with the same leading characters headed to the altar.
At the end of the latest episode, the field of suitors for the multi-billion-dollar GPS IIIF contract narrowed suddenly in April when two of the three corporate hopefuls abruptly left the field.