LR9548S GPS Module Technical Manual v1.52
© 2006 Leadtek Research Inc. All rights reserved. Page 20/20
Preliminar
Confidential - Information is sub
ect
o chan
e without
rior notice.
Time To First Fix (TTFF)
The time it takes a GPS receiver to find satellites after you first turn it on, when the GPS receiver has
lost memory, or has been moved over 300 miles from its last location. Standard TTFF Timing consists
of:
Mode Requires Timing
Snap Start Hot + Clock + Sat Pos 3 minutes off
Hot Start Warm + Ephemeris 30 minutes off
Warm Start Position Accuracy
Time Accuracy
Almanac
<500 KM
<2 hours
<1 year
Cold Start Nothing N/A
Specifications are typical times assuming good satellite visibility and above threshold signal strengths.
WAAS
A system of satellites and ground stations that provide GPS signal corrections for better position
accuracy. A WAAS-capable receiver can give you a position accuracy of better than three meters, 95
percent of the time. (At this time, the system is still in the development stage and is not fully
operational.) WAAS consists of approximately 25 ground reference stations positioned across the
United States that monitor GPS satellite data. Two master stations, located on either coast, collect data
from the reference stations and create a GPS correction message.
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