ARTOA4 formula overview

SATFIX estimated time of arrival

For every soundsource where a SATFIX is available, the estimated time of arrival is calculated the following way:

ETA = windowStartTime [s] - leapSeconds [s] + \frac{distance ~[km]}{soundspeed ~[km/s]} - floatWindowStart [s]

where

windowStartTime [s] = soundsource.reftime - (float.phasereftime * floatSchedule)~modulo~24
\newline
floatWindowStart [s] = float.windowstart

TOA calculation for soundsource during tracking algorithm

TOA_{resulting (t, u)} = TOA_{measured} + Offset_{float} + Drift_{float (t)} - Offset_{soundsource} - Drift_{soundsource (u)}

where

• Offset_{float} is the offset of the float,
• Drift_{float (t)} is the drift of the float at timestamp t (since start of float),
• Offset_{soundsource} is the offset of the soundsource,
• Drift_{soundsource (u)} is the drift of the soundsource at timestamp u (since start of soundsource).