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buphone Occasional Visitor
Joined: Aug 01, 2005 Posts: 36
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Posted: Sun Jan 08, 2006 6:07 pm Post subject: Time to first fix |
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The time to first fix for the mk2 gps unit seems to vary from a few seconds to a few minutes. What is it doing in that time and why it varies? |
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CJackel492 Regular Visitor
Joined: Mar 15, 2005 Posts: 210
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Posted: Mon Jan 09, 2006 10:25 am Post subject: Re: Time to first fix |
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buphone wrote: | The time to first fix for the mk2 gps unit seems to vary from a few seconds to a few minutes. What is it doing in that time and why it varies? |
I think it's to do with the firmware in the receiver,
I've found it can take over 5 minutes to get a lock sometimes,
To get a quicker lock, Turn the receiver on from the location that it was last switched off and also ensure it has a clear view of the sky,
I've found this is the only way to get a quick lock,
Carl, _________________ Phones - Nokia 9500 + a few others
Nokia 9500 running TTM5 |
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MARViN2003 Regular Visitor
Joined: Nov 27, 2005 Posts: 132 Location: Stroud, Gloucestershire
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Posted: Mon Jan 09, 2006 12:01 pm Post subject: |
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It seems to lock on better when stationary as well.
Basically it searches for the satellite signals and then calculates it's position from those signals. It needs to get at least 3 reliable signals for it to lock-on. |
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buphone Occasional Visitor
Joined: Aug 01, 2005 Posts: 36
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Posted: Wed Jan 11, 2006 12:58 pm Post subject: |
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Thanks for the replies. I searched this website and others. Here is something that helped me understand and fits with what people here are saying:
http://www.pocketgpsworld.com/ttffcomparisons.php
It seems that TTFF will increase if:
* I switch the antenna on in a different place
* I move while it is trying to do the first fix |
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buphone Occasional Visitor
Joined: Aug 01, 2005 Posts: 36
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Posted: Wed Jan 11, 2006 1:11 pm Post subject: |
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Further to my last post, I would like to ask a question about TTFF in a new location.
Here is a common scenario. I have tomtom mobile 5. I get home in my car and turn tomtom off. I take both the phone and the antenna into the house. I don't bother to turn the antenna off because it switches off by itself after a while. Thus the antenna could be switching off inside the house.
In the morning, I go out to the car. I turn the antenna on and start tomtom.
So the location change involves a few metres. It also involves a change of signal strength (weaker inside the house). Are either of these changes significant enough for me to modify my routine? |
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MarkHewitt Frequent Visitor
Joined: Nov 16, 2004 Posts: 1077 Location: Chester-le-Street & York
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Posted: Wed Jan 11, 2006 2:37 pm Post subject: |
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buphone wrote: | Are either of these changes significant enough for me to modify my routine? |
Bascially, no. The length of time off is probably more significant than the location change, that tends to only come into affect when you are talking in the hundreds of miles. |
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