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MTI-2 SiRFstarII

MTI-2 SiRFstarII


Product Features

SiRF GPS Architecture
SiRF starII high performance and low power consumption chip set
Support standard NMEA 0183 protocol
All-in-view 12-channel parallel processing
SnapLock 100ms re-acquisition time
Cold start under 45 seconds, average
Superior urban canyon performance
FoliageLock for weak signal tracking
Full-duplex RS-232 port for navigation and control messages
Differential GPS capability through 2 nd RS-232 port

System Specification

Electrical Characteristics


Frequency L1, 1575.42MHz
C/A code 1.023MHz chip rate
Channels 12
Sensitivity -175dBW


Position Horizontal 15m 2d RMS (SA off) 1 ~ 5 m ,WAAS/EGNOS enable
Velocity 0.1m/sec 95% (SA off),
Time 1microsecond synchronized to GPS time



Acquisition Rate

Reacqusition 0.1 sec., average (recovery time for being interrupted)
Hot start 8 sec., average (with ephemeris and almanac valid)
Warm start 38 sec., average (with almanac but not ephemeris)
Cold start 48 sec., average (neither almanac nor ephemeris)

Dynamic Condition

Altitude 18,000 meters (60,000 feet) max.
Velocity 515 meters/sec. (1000knots) max.


Voltage supply 3.3Vdc ~ 5.5Vdc
Current supply Continuous mode 60mA typical
Trickle power 25mA typical
Backup Power +2.5V to +3.6V
Backup Current 10uA typical

Serial Port

Ports one for GPS, one for DGPS
Electrical level : TTL level, Output voltage : 0 ~ 2.85v
Communication Full duplex asynchronous
Code type ASCII
GPS Protocol SiRF binary/NMEA 0183 changeable(Default:NMEA)
GPS Function SiRF binary >> position, velocity, altitude, status and control
NMEA 0183 >> GGA, GSA, GSV, RMC (VTG and GLL are optional)
GPS transfer rate Software command setting
(Default : 4800bps for NMEA )
DGPS protocol RTCM SC-104, ver 2.00, type 1, 2, and 9  

Time Mark (1 PPS Pulse)

Level TTL
Pulse duration 100ms
Time reference At the pulse positive edge
Measurement Aligned to GPS sec., +/- 1us

Active Antenna Connector


Environmental Characteristics


Operating -40 deg. C to +80 deg. C
Storage -40 deg. C to +85 deg. C