EMTAC CRUX II BTGPS, Руководство пользователя

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Prepare to use you CRUX II / BTGPS Receiver
To help you begin to use your CRUX II / BTGPS
TM
Receiver (“BTGPS”), read this User
Guide in the first step. This User Guide explains the detail how BTGPS operates,
functions, and common features of the BTGPS. A short glossary of GPS related terms
and abbreviations at the back of the User Guide.
Before you begin using your BTGPS, you must complete the application software
installation tasks on your host device like PAD, PDA mobile phone, MMS mobile phone,
handheld PC, and portable PC hardware. For information about the hardware
operation and application software installation, please refer to the documentation that
accompanies each product.
For operation detail information, please consult Chapter 3. In order to get more
familiar with your BTGPS, please first read Chapter 2 before starting to operate
BTGPS.
GPS signal reception
The Global Positioning System (GPS) is a space-based radio-navigation system. This
system consists of 24 satellites, which orbit the Earth at an altitude of approximately
17,500 kilometers, and ground control stations. Each of the 24 satellites, deployed in
6 orbital planes, circles the earth twice a day. The system satellites continuously
transmit signals contain the information of time and distance in a precise formation,
24 hours a day in any weather condition, everywhere around the world. By processing
the signals received, BTGPS provides users with helpful information of position,
velocity, and time for navigation and location awareness purposes anywhere anytime
on the Earth.
The BTGPS offers high position accuracy and fast Time-To-First-Fix (TTFF), which rely
on environment circumstances where receiver located as well as initial states of the
receiver. During attempting to a position fix, the receiver needs to lock on to at least
3 satellites and, uses the signal can be received as well as the data of latest position
stored in the receiver’s digital memory in order to compute the location of the device.
Environmental factors that influence the position accuracy and TTFF including such as
tall buildings,