Learning to Fly
- Jun 3, 2015
- Reaction score
You can disagree as much as you like and quote as many sites as you want. I see my satellite count on my Trimble GPS screen from early morning till evening day in, day out. My system is worth more than most peoples vehicles. I have surveyed in South Africa, Australia & Canada - You might know a lot more about radar/laser but my knowledge and first hand experience of GPS I'm sure outweighs most! Satellite numbers during the middle of the day are far higher than those at night - do you think this is coincidence? If the planes were equally spaced don't you think you'd have the same amount of satellites roughly at all times of the day.... I challenge you to look at this on even a less high tech device. Do you even know what the difference is between the L1, L2C & L5 Signals without Googling? Back in the day when there was fewer satellites there were "windows of time" where GPS worked and others where they didn't - sound equally spaced? Don't believe everything you read online. I have first hand knowledge of this and merely trying to share being someone in the know.Okay, there are a few factual inaccuracies here. First, GPS is not designed to give a view of more satellites to US territory than the rest of the world. The orbital planes are equally spaced around the Earth. GPS.gov: Space Segment
Second, the term "GPS" can sometimes be used to refer to any device capable of receiving satellite navigation signals. Many chips actually receive, GPS, GLONASS, and Galileo signals, all in one device.
However, you are correct that GPS is not as reliable in the high latitudes. The orbital inclination of the satellites is only 55°. Galileo is only 56° inclination, and GLONASS, as you might imagine, has a higher inclination, at 64.8°, because the Russians have a lot of arctic territory and care about coverage there more than other countries.
Yep, that analysis is spot on. There are no benefits. In the best case, it's useless. In the worst case, it's going to get someone a ticket.
I'm well aware of the different "GPS", My work device is capable of receiving: GPS, GLONASS, Galileo, Beidou (CHINA) and also QZSS (JAPAN) - I need not be lectured, I had a professor for that. I trust that was for anyone that didn't know! I have had up to 33 Fixed Satellites at a time with the total in view being 41 (Less than 10 degree mask gets dropped). How do you think I can survey at accuracies of less than 20mm in trees. As I said I stand corrected but the ALP Device only uses GPS - The American One and likely at best L2C signals - these are cheap units, we buy them for C$85. Probably only worth C$25 at most. Does that sound like a highly capable chip to you?