LR9548S GPS Module Technical Manual v1.52
© 2006 Leadtek Research Inc. All rights reserved.
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Preliminary Confidential - Information is subject to change without prior notice.
Glossary
A-GPS
Assisted GPS or AGPS is a technology that uses an assistance server to cut down the time needed to
find the location. Although GPS provides excellent position accuracy, position fixes require lines of
sight to the satellites. In regular GPS networks there are only GPS satellites and GPS receivers.
In A-GPS networks, the receiver, being limited in processing power and normally under less than ideal
locations for position fixing, communicates with the assistance server that has high processing power
and access to a reference network. Although dependent on cellular coverage, AGPS processing is
quicker and more efficient than regular GPS.
API
An application programming interface is a set of definitions of the way one piece of computer software
communicates with another. One of the primary purposes of an API is to provide a set of commonly
used functions, such as to draw windows or icons on the screen. Programmers can then take advantage
of the API by making use of its functionality, saving them the task of programming everything from
scratch.
Baud Rate
Is a measure of the signaling rate, which is the number of changes to the transmission media per
second in a modulated signal.
For Example: 250 baud means that 250 signals are transmitted in one second. If each signal carries 4
bits of information then in each second 1000 bits are transmitted. This is abbreviated as 1000 bit/s.
Dead Reckoning
The process of estimating your position by advancing a known position using course, speed, time and
distance to be traveled. It is figuring out where you will be at a certain time if you hold the speed, time
and course you plan to travel.