User's Manual
Table Of Contents
- Contents
- Figures
- Tables
- Document history
- Introduction
- Product concept
- GSM application interface
- GSM/GPRS operating modes
- Power supply
- Power up / down scenarios
- Automatic GPRS Multislot Class change
- Charging control of the GSM part
- Power saving
- Summary of state transitions (except SLEEP mode)
- RTC backup for GSM part of XT55/56
- Serial interfaces of the XT55/56 GSM part
- Audio interfaces
- SIM interface
- Control signals
- GPS application interface
- GSM and GPS antenna interfaces
- Electrical, reliability and radio characteristics
- Mechanics
- Reference approval
- Example applications
- List of parts and accessories
XT55/56 Hardware Interface Description
Confidential / Released
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XT55/56_hd_v02.06a Page 71 of 125 17.12.2004
4.2 Technical data
Industry leading GPS performance
• 12 channel GPS receiver
• Signal acquisition using 1920 time / frequency search channels
• Multipath-mitigation hardware
• Cold start < 45 sec
Low power
• Typ. 220mW without active antenna (continuous mode)
• TricklePower™ mode reduces power to < 60mW
• Adaptive TricklePower™ switches between full and TricklePower™
• Push-to-Fix reduces power by as much as 98%
Additional software options (can be obtained separately)
• AVL (for further information refer to [3])
• SiRFXtrac (high sensitivity stand alone software)
• SiRFDrive (high sensitivity dead reckoning software)
Protocols
• SDI1 / SDO1: NMEA 9600 baud, Msg.: GLL, GGA, RMC, VTG, GSV, GSA
8 data bits, no parity, 1 stop bit
• SDI2 / SDO2: RTCM, 9600 baud
Specification
• Position accuracy
Autonomous: < 10m
Beacon DGPS: < 2.5m
• Receiver
Tracking: L1, CA code
Channels: 12
Max. update rate: 10 Hz
Sensitivity: -138 ± 2 dBm
1)
Max. altitude: <60.000 ft
Max. velocity: <1.000 knots
Protocol support: NMEA, SiRF binary
• Acquisition rate
SnapStart: < 3 sec
Hotstart: < 8 sec
Warmstart: < 38 sec
Coldstart: < 45 sec
1)
The specified GPS receiver sensitivity of the XT55/56 (GPS software version 2.3) in
tracking mode is related to the ARP (antenna reference point). However, the applied
antenna, the antenna amplifier, the customer application and / or the applied reference
setup might cause variations of the stated receiver sensitivity value.