Assured Positioning System (APS) provides location/navigation information in environments where GPS or other GNSS is unavailable or unreliable. APS derives location information from ordinary communications signals transmitted from Globalstar low-Earth-orbit (LEO) satellites. These signals-of-opportunity (SoOP) are not special position/navigation signals and are not subject to GPS/GNSS jamming or spoofing. For dismount applications, SoOP technology can be combined with IMU and barometric sensor inputs. APS is provided as a plug-in to the Android Team Awareness Kit (ATAK) residing on a user smartphone.
Non-GNSS Satellite Communications Signals
Terrestrial Signals of Opportunity (SoOP)
IMU & Barometric Sensors
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