Falcom GmbH 051-1-1 ユーザーズマニュアル
Description
GPS receiver
A2D–JP
Version 1.03
Side 24
Frequency (IF) sampled data to the Scorpio device. The Scorpio de-
vice contains an integral microprocessor and all the required GPS-
specific signal processing hardware. Memory and other external
supporting components configure the GPS receiver into a complete
navigation system.
vice contains an integral microprocessor and all the required GPS-
specific signal processing hardware. Memory and other external
supporting components configure the GPS receiver into a complete
navigation system.
6.2.2 Product applications
❐
Automotive applications
❐
Marine navigation applications
❐
Aviation applications
❐
Timing applications
6.3
Technical description
6.3.1 General information
Since the GPS receiver determines its position by ranging signals
from four or more GPS satellites orbiting the Earth, its antenna must
have reasonable visibility of the sky.
from four or more GPS satellites orbiting the Earth, its antenna must
have reasonable visibility of the sky.
Navigation modes
The GPS receiver supports three types of navigation mode operati-
ons.
ons.
❐
Three dimensional navigation (3D): The GPS receiver
defaults to 3-D navigation whenever at least four GPS satelli-
tes are being tracked In 3-D navigation, the GPS receiver com-
putes latitude, longitude, altitude and time information from
satellites measurements.
defaults to 3-D navigation whenever at least four GPS satelli-
tes are being tracked In 3-D navigation, the GPS receiver com-
putes latitude, longitude, altitude and time information from
satellites measurements.
❐
Two dimension navigation (2D): When less than four GPS
satellite signals are available or when a fixed value of altitude
can be used to produce an acceptable navigation solution, the
GPS receiver will enter the 2-D navigation mode. Forced ope-
rating in 2-D mode can be commanded by the OEM.
satellite signals are available or when a fixed value of altitude
can be used to produce an acceptable navigation solution, the
GPS receiver will enter the 2-D navigation mode. Forced ope-
rating in 2-D mode can be commanded by the OEM.
❐
DGPS navigation: The GPS receiver processes DGPS cor-
rections through its Auxiliary serial port. These corrections
must be compliant with the RTCM recommended standards
RTMC-104.
rections through its Auxiliary serial port. These corrections
must be compliant with the RTCM recommended standards
RTMC-104.
Satellites acquisition
The TTFF of the GPS receiver depends from start conditions.
Start condition means if old satellites data are available and how old
they are. The conditions are:
Start condition means if old satellites data are available and how old
they are. The conditions are:
❐
Warm start: results from an short (few minutes) interrupt by
continuous navigation. Data are available in SRAM.
continuous navigation. Data are available in SRAM.