AXIUS Drive H/W & S/W Updates Announced

[Woody]

I thought GPS satellites were geosynchronous - aka they don't disappear over the horizon. Also, though I can't quote the source, I thought I had read about a year ago that the system does compensate for fluctuations in GPS data. When I was reading about it (and I did a lot of reading), I immediately questioned the use of satellites to maintain position around a fuel pump, but after further reading, was convinced that the non-idiots had come up with a system to compensate. It may have been gyros, or software, I don't remeber the details, but I do remember being satisfied with the explanation.

I know that they're not geosynchronous because they orbit around the earth approx every 12 hrs. I think you could then get the situation FC3 describes as the receiver drops satellites or picks up others. I've watched my GPS and you can see see when it drops or adds satellites sometimes predictably because it shows their location relative to the horizon.

 

[Presentation]

I know that they're not geosynchronous because they orbit around the earth approx every 12 hrs. I think you could then get the situation FC3 describes as the receiver drops satellites or picks up others. I've watched my GPS and you can see see when it drops or adds satellites sometimes predictably because it shows their location relative to the horizon.

A visual example of the GPS constellation in motion with the Earth rotating. Notice how the number of satellites in view from a given point on the Earth's surface, in this example at 45°N, changes with time.

 

[osd9]

That's a pretty cool gif! Am I seeing 6 distinct orbits?

 

[douglee25]

Well isn't that just a stellar visual.

Doug

 

[fc3]

I thought GPS satellites were geosynchronous - aka they don't disappear over the horizon. Also, though I can't quote the source, I thought I had read about a year ago that the system does compensate for fluctuations in GPS data. When I was reading about it (and I did a lot of reading), I immediately questioned the use of satellites to maintain position around a fuel pump, but after further reading, was convinced that the non-idiots had come up with a system to compensate. It may have been gyros, or software, I don't remeber the details, but I do remember being satisfied with the explanation.

I know that they're not geosynchronous because they orbit around the earth approx every 12 hrs. I think you could then get the situation FC3 describes as the receiver drops satellites or picks up others. I've watched my GPS and you can see see when it drops or adds satellites sometimes predictably because it shows their location relative to the horizon.

That's a pretty cool gif! Am I seeing 6 distinct orbits?

Dom wins the prize! All the lobster you can eat! You can collect in Atlantic City from the guy who's not bringing lobster.

The GPS constellation consists of 24 satellites in medium earth orbit with four satellites in each of the six planes. Woody is close. The satellites orbit the earth every 12 sidereal hours. That's 11 hours and 58 minutes to those of us down on the ground. The orbital plan is such that at least four satellites are in view at any one time.

There is a correction system in place. It's called WAAS and was developed mostly for aeronautical use by the FAA. The system uses ground stations to determine GPS error, which is transmitted up to a satellite when then downlinks the error correction signal.

Best regards,
Frank