3 ms·
> According to [0] the clock drift due to relativistic effects would be over 45000 nanoseconds per day. Between an uncorrected satellite and the receiver. This
by dom0 10y ago
> According to [0] the clock drift due to relativistic effects would be over 45000 nanoseconds per day.
Between an uncorrected satellite and the receiver. This error is already removed through the fourth variable, only the average error of the satellites used for this remains (assuming perfect receiver etc.). So even if the satellites where not corrected the positioning error would not be "XY kilometers per day and climbing", the much smaller difference in time dilation between satellites would remain though.
- jayisbatman 10y agoThe location calculation is completely dependent upon relativistic time dilation. The Navistar satellites have an orbital speed of 8,750 MPH (more than 2 miles per second, relative to our earth surface frame), they are subject to a relativistic time dilation adjustment of -7201ns (slower than our earth surface frame). The location calculation cannot ignore that. The GPS signal (radio) takes on average 1 foot per nanosecond (perhaps a slightly bit more, but this is electromag radiation in a non-vacuum). If your receiver didn't account for this you would be more than a mile from your actual location. Relativity and its time dilation are required for any satellite based location system -- unless your satellites are at altitude of zero.