Falcom GmbH 051-1-1 ユーザーズマニュアル
Description
GPS receiver
A2D–JP
Version 1.03
Side 23
6.2
Product overview
The GPS receiver requires conditioned 3,3 V DC power and a GPS
signal from a passive or active antenna.
signal from a passive or active antenna.
The 12 channel architecture provides rapid Time-To-First-Fix
(TTFF) under all start-up conditions. As long as visible satellites are
not obscured, acquisition is guaranteed under all initialisation con-
ditions.
(TTFF) under all start-up conditions. As long as visible satellites are
not obscured, acquisition is guaranteed under all initialisation con-
ditions.
To minimise TTFF when main power is removed from the GPS re-
ceiver SRAM with external DC supply voltage and EEPROM are
used to archive RTC time and prior position data.
ceiver SRAM with external DC supply voltage and EEPROM are
used to archive RTC time and prior position data.
Communication with the GPS receiver is established through two
asynchronous serial I/O ports. The GPS receiver's primary serial
port outputs navigation data and accepts commands from OEM ap-
plication in NMEA-0183 format or CONEXANT binary format.
asynchronous serial I/O ports. The GPS receiver's primary serial
port outputs navigation data and accepts commands from OEM ap-
plication in NMEA-0183 format or CONEXANT binary format.
The secondary port is configured to accept differential GPS (DGPS)
corrections in the RTCM SC-104 format.
corrections in the RTCM SC-104 format.
6.2.1 GPS receiver architecture
Figure 7: GPS receiver architecture
The functional architecture of the GPS receiver is shown in Figure 7.
The GPS receiver design is based on the Conexant Zodiac chip set,
the RF-Monopac and the Scorpio DSP, which contain the required
GPS functionality. The RF-Monopac contains all the RF down-con-
version and amplification circuitry, and presents the In-Phase (I) and
Quadrature-Phase (Q) Intermediate.
The GPS receiver design is based on the Conexant Zodiac chip set,
the RF-Monopac and the Scorpio DSP, which contain the required
GPS functionality. The RF-Monopac contains all the RF down-con-
version and amplification circuitry, and presents the In-Phase (I) and
Quadrature-Phase (Q) Intermediate.