Specifications

XT55 Hardware Interface Description
Confidential / Preliminary
s
mo b i l e
XT55_hd_v00.02 Page 69 of 116 17.03.2004
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])
· TCP/IP
· 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: -172dBW
Max. Altitude: <60.000 ft
Max. velocity: <1.000 knots
Protocol support: NMEA, SiRF binary
· Acquisition rate
SnapStart: < 3 sec
Hot Start: < 8 sec
Warm Start: < 38 sec
Cold Start: < 45 sec