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[gpsd-dev] [PATCH 5/9] Define TTFF
From: |
Sanjeev Gupta |
Subject: |
[gpsd-dev] [PATCH 5/9] Define TTFF |
Date: |
Fri, 17 Apr 2015 22:54:53 +0800 |
---
www/gps-hacking.html | 13 +++++++------
1 file changed, 7 insertions(+), 6 deletions(-)
diff --git a/www/gps-hacking.html b/www/gps-hacking.html
index 3bdacc9..bee0274 100644
--- a/www/gps-hacking.html
+++ b/www/gps-hacking.html
@@ -383,12 +383,13 @@ feel for what your GPS has to say, and how often it says
it.</p>
<h1>Locking and Loading</h1>
-<p>The time required for a GPS to get a fix can vary from under 15
-seconds up to just under 30 minutes (actually, 29 plus calculation
-time). The main factors affecting this latency are (a) whether it has
-an almanac available, (b) whether it has satellite ephemerides
-available, and (c) whether it has recent fix available. Of course the
-quality of signal at your location matters as well.</p>
+<p>The time required for a GPS to get a fix (Time To First Fix (TTFF))
+can vary from under 15 seconds up to just under 30 minutes (actually,
+29 plus calculation time). The main factors affecting this latency are
+(a) whether it has an almanac available,
+(b) whether it has satellite ephemerides available, and
+(c) whether it has recent fix available.
+Of course the quality of signal at your location matters as well.</p>
<p>If a GPS has not been on for several months, then it has no current
almanac available. It was to wait to download one before it can
--
2.1.4
[gpsd-dev] [PATCH 5/9] Define TTFF,
Sanjeev Gupta <=
- Re: [gpsd-dev] [PATCH 5/9] Define TTFF, Hal Murray, 2015/04/17
- Re: [gpsd-dev] [PATCH 5/9] Define TTFF, Gary E. Miller, 2015/04/17
- Re: [gpsd-dev] [PATCH 5/9] Define TTFF, Gerry Creager - NOAA Affiliate, 2015/04/17
- Re: [gpsd-dev] [PATCH 5/9] Define TTFF, Gary E. Miller, 2015/04/17
- Re: [gpsd-dev] [PATCH 5/9] Define TTFF, Sanjeev Gupta, 2015/04/17
- Re: [gpsd-dev] [PATCH 5/9] Define TTFF, Gerry Creager - NOAA Affiliate, 2015/04/17
- Re: [gpsd-dev] [PATCH 5/9] Define TTFF, Sanjeev Gupta, 2015/04/17
- Re: [gpsd-dev] [PATCH 5/9] Define TTFF, Gerry Creager - NOAA Affiliate, 2015/04/17