STL Performance for Positioning of Vessels and Ground Vehicles in GNSS Denied Environments
Oleg Garitselov, Brent Abbott, Andrey Tyagunov, Ryan Johnson, Orolia/Spectracom
Location: Big Sur
Alternate Number 1
A new Satellite Time and Location (STL) signal is available to augment GNSS receivers for providing Resilient Positioning, Navigation and Timing (R-PNT). Currently, the STL signal has proven its usefulness in static situations – for precision timing and geo-location authentication. We now examine its utility in the slow moving dynamic environment of maritime vessels and moderate speed ground vehicles. A navigation system comprising a GNSS receiver + IMU + STL receiver should perform much better in GNSS denied environments than just a free running INS. How much better? This paper will analyze the expected performance of this navigation method of an INS receiving range and Doppler updates from STL. Some factors to be examined:
• Error probability in position and velocity vector over time from the onset of GNSS denial
• Error ellipse in North/South v. East/West direction
• Error as a function of number of STL satellites tracked (1-3)
• Error as a function of velocity – 0 – 20 knot range for vessel; 0 – 75 kph for ground vehicles.
• Error difference between low and high latitudes (above 50°) – especially interesting for Arctic Ocean navigation
Analysis will be supported by experimental trials, to the extent available at the time of the conference.