### Speed of a GPS Satellite

Posted:

**Tue Jan 15, 2019 8:10 am**The orbit of a typical GPS satellite has an altitude above the Earth of about 12,550-miles. The average radius of the Earth is about 3,959-miles. This means the radius of the GPS satellite orbit is then 12,550 plus 3959 or about 16,509-miles. The orbit is nominally a circular orbit, so we can compute the circumference of a circle with radius 16209-miles as 2πr, or 103,729-miles.

The orbital period of a GPS satellite is nominally 11-hours and 58-minutes or 11.967-hours We can roughly approximate the speed by using

Speed = Distance/Time

Speed = 103729-miles/11.967-hours

Speed = 8,668-MPH

In terms of feet-per-second, the satellite is moving at a rate of 12,713-feet-per-second.

The orbital period of a GPS satellite is nominally 11-hours and 58-minutes or 11.967-hours We can roughly approximate the speed by using

Speed = Distance/Time

Speed = 103729-miles/11.967-hours

Speed = 8,668-MPH

In terms of feet-per-second, the satellite is moving at a rate of 12,713-feet-per-second.