Preparing To Use Your Falcom Navi-Xs; How Does The Falcom Navi-Xs Work - FALCOM NAVI-XS User Manual

Navi-xs User's Guide

2 PREPARING TO USE YOUR FALCOM NAVI-XS

Read this manual in order to begin using your FALCOM NAVI-XS and to understand
its operations, functions, and common features.
You must first install a GPS Mapping software on your PC, laptop, PDA, or other
handheld devices (if none is already installed).
In order to have a Bluetooth™ connection with your Falcom NAVI-XS, make sure that
the host device is a Bluetooth™-enabled one.
For more information about software installation, please refer to chapters described
below.

2.1 How does the FALCOM NAVI-XS work?

The FALCOM NAVI-XS using SiRFXTrac 2.0.2 software offers high position accuracy
and fast Time-To-First-Fix (TTFF) than is currently possible with other autonomous GPS
solution. This means that the NAVI-XS will continue to determinate its positions or
obtain an initial fix in places previously not possible.
When the GPS receiver is initially turned on, it begins to determinate its current
positions, velocity and time, achieving time-to-first-fix in only seconds by acquiring
signals down to –159 dBm. While trying to calculate a position fix, the receiver needs
to be locked-on to at least four satellites.
When the required data is completely collected, then satellite signals are tracked
continuously and the position is calculated from time to time. When the received
data from satellites is considered valid then the FALCOM NAVI-XS is available for
navigation. The validity of these data stored in SRAM is kept due to RTC keeps
running from the connected NiMH batteries and these data may still be valid from
the previous operation. In order to calculate quickly its current location, on the next
power up, the receiver uses the current received signals from in view satellites,
simultaneously holds the stored data from its memory (SRAM).
As above the initial state of the NAVI-XS GPS receiver refers to the last status of the
receiver in memory (SRAM). This primarily determines the length of time it will take for
your FALCOM NAVI-XS to obtain a valid GPS fix.
Your position can be extremely quick fixed within 8 second from a "hot-start open
sky" state, and within 45 seconds from a "cold-start" state. The FALCOM NAVI-XS
stores data about where the satellites are located at any given time. The data is
called almanac. Occasionally, when the FALCOM NAVI-XS has been turned off for a
long time, the almanac may get out-dated or "cold" so the NAVI-XS performs a cold
start. Otherwise, if the time and position are known, as well the almanac data are
also valid then the FALCOM NAVI-XS performs a Hot start.
The NAVI-XS uses the satellite signals to calculate its exact current location by
calculating its distance from the satellites. The position data within the receiver is
then converted into latitude and longitude coordinates which are usually provided
in the geodetic datum on which the GPS is based (WGS84) and transmitted via
integrated Bluetooth™ transceiver direct to the Bluetooth™-enabled device (PC,
laptop or Pocked PC).
This confidential document is a property of FALCOM GmbH and may not be copied or circulated without previous permission.
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