GPS 15 Technical Specifications (P/N 190-00266-00)
Rev. B
Page 5
1.5.4
GPS Performance
1.5.4.1
Receiver
12 parallel channel GPS receiver continuously tracks and uses up to 12 satellites to compute and update
your position.
1.5.4.2
Acquisition Times
•
Reacquisition: Less than 2 seconds
•
Warm:
Approx. 15 seconds (all data known)
•
Cold:
Approx. 45 seconds (initial position, time, and almanac known; ephemeris unknown)
•
AutoLocate
TM
: 5 minutes (almanac known; initial position and time unknown)
•
SkySearch:
5 minutes (no data known)
1.5.4.3
Update Rate
1 record per second
1.5.4.4
Accuracy
•
GPS Standard Positioning Service (SPS)
Position:
< 15 meters, 95% typical
Velocity:
0.1 knot RMS steady state
•
Dynamics: 999 knots velocity (only limited at altitude greater than 60,000 feet),
6g acceleration, <6g jerk
1.5.5
Interfaces
1.5.5.1
GPS 15 Electrical Characteristics
•
CMOS level output for interfacing directly to an asynchronous serial port on the host microprocessor.
•
Factory jumper settings determine baud rate (not user-accessible). Factory setting is 4800 baud.
1.5.5.2
Port 1 Protocols
•
NMEA 0183 Version 2.20
•
ASCII output sentences GPGGA, GPGSA, GPGSV, and GPRMC (NMEA-approved sentences);
PGRME, PGRMM, and PGRMT (Garmin proprietary sentences)
•
NMEA 0183 Outputs (see Section 4.2 Transmitted NMEA 0183 Sentences for full protocol
specifications)
Position, velocity, and time
Receiver and satellite status
Geometry and error estimates
•
NMEA 0183 Inputs (see Section 4.1 Received NMEA 0183 Sentences for full protocol specifications)
Initialize position, date, and time (not required)
Initialize Earth datum
