Nasa space map uses quasars to guide GPS satnavs

The GPS technology behind satnavs work in the same way as sailors navigating by the stars – they use seemingly fixed landmarks to establish the position of the satellites, and then the GPS receiver works out its position using its distance from the satellites.

Dr Chopo Ma of Nasa’s Goddard Space Flight Center, says: “For GPS to work, the orbital position, or ephemeris, of the satellites has to be known very precisely.

Read more…

Leave a Reply

Your email address will not be published. Required fields are marked *