GPS Guru wanted

[Dave_Snelson]

Anyone out there who is a real techie on GPS that can answer a question for me please.

I have been told that the geo-stationary satellites can now receive signals for relaying as well as send the CA and P codes, is this at all true under none military circumstances?

Apparently this is a new thing but I am very doubtful and I need to challenge my source for a project I am working on.

Thanks.

 

[desG]

There is an article at http://www.gpsworld.com/ regarding Inmarsat's New Navigation Payload whereby Geostationary satellites (GEOs) can augment the performance of GPS by providing a separate ranging channel to transmit integrity and correction data. Maybe this contains the info you want.

 

[Bergman]

I don't think the satellites used to provide GPS service are geostationary. I believe that they are at about half geostationary altitude.

This would mean that any up-link to a satellite would have to track the bird and manage hand-over to an alternative as the original satellite dropped below the horizon.

 

[Guest]

Re: Garmin?

Thos Garmin people may know. There's a chap called Viktor (he sounds very Russian) all knowledgeable at their support centre in (i think ) waterlooville or thereabouts. or of couorse, some v knowleable people may be let out at the boat show?

 

[Dave_Snelson]

Many thanks for that, I'll go visit the site.

 

[Dave_Snelson]

Yes, technically you are right. These sats can be moved around, especially at time of war to increase accuracy at any given location. Your point about hand-over is well noted - thanks.