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OM3 Occasional Visitor
Joined: Aug 11, 2005 Posts: 17
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Posted: Thu Jul 13, 2006 12:57 pm Post subject: 32 channels better than 20? |
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I've seen GPS receiver that have 32 channels.
Are these significantly better than 20 channel units?
Thanks.
OM |
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mikealder Pocket GPS Moderator
Joined: Jan 14, 2005 Posts: 19638 Location: Blackpool , Lancs
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Posted: Thu Jul 13, 2006 3:46 pm Post subject: |
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As there are only 24 satellites orbiting the planet that are used for GPS positional data in use at any single time, also you can only theoretically see a maximum of 12 satellites from a ground based position at any single time, so there is little point in having multi channel capable receivers that have more channels than there are satellites in orbit..
In practice the extra channels on the 20 or 32 chnl devices will be used as the receiver will pick up multiple path signals from the same satellite (reflections off buildings etc) - the issue of which is best - there are far more important factors to consider, sensitivity etc.
Personally if its not equipped with a SiRF-III chipset I wouldn’t touch it - Mike |
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7andy Regular Visitor
Joined: Jul 02, 2005 Posts: 74
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Posted: Fri Jul 14, 2006 1:28 pm Post subject: |
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Don't forget, in the near future (c 2008) we shall start to see Gallileo (the European GPS system) coming online, so theoretically, we could see more than twelve satellites.
Cheers, 7&Y |
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neil01 Frequent Visitor
Joined: May 06, 2005 Posts: 902 Location: Leeds
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Posted: Fri Jul 14, 2006 1:31 pm Post subject: |
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7andy wrote: | Don't forget, in the near future (c 2008) we shall start to see Gallileo (the European GPS system) coming online, so theoretically, we could see more than twelve satellites... |
But will the current hardware be compatible? |
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7andy Regular Visitor
Joined: Jul 02, 2005 Posts: 74
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Posted: Sat Jul 15, 2006 10:18 am Post subject: |
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I understand that's the plan :D In fact it's so compatible, that the Americans demanded that they should be able to turn it off should they wish.
Cheers, 7&Y
PS Since when did the Americans own Space?? |
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portman Frequent Visitor
Joined: Nov 10, 2005 Posts: 435 Location: Dorset
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Posted: Thu Jul 20, 2006 4:27 pm Post subject: |
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I've got a Qstarz BT-880 (32channel)bought off ebay about 6/8 months ago and its very good, works indoors and out, instant hot start and 30-40 secs cold start, about half the time of my Garmin i3. |
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