Garmin GPS 17HVS Technical Specifications - Page 10

GPS Performance, Receiver, Acquisition Times, Sentence Rate, Accuracy, Interfaces, Port 1, PPS - gps receiver

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1.7.4 GPS Performance 1.7.4.1 Receiver WAAS Enabled™; 12 parallel channel GPS receiver continuously tracks and uses up to 12 satellites (up to 11 with PPS active) to compute and update your position. 1.7.4.2 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®: 5 minutes (almanac known; initial position and time unknown) • SkySearch: 5 minutes (no data known) 1.7.4.3 Sentence Rate 1 second default; NMEA 0183 output interval configurable from 1 to 900 seconds in 1-second increments 1.7.4.4 Accuracy • GPS Standard Positioning Service (SPS) Position:

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190-00228-21
GPS 16/17 Technical Specifications
Rev. A
Page 6
1.7.4
GPS Performance
1.7.4.1 Receiver
WAAS
Enabled™; 12 parallel channel GPS receiver continuously tracks and uses up to 12 satellites (up to 11 with
PPS active) to compute and update your position.
1.7.4.2 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
®
:
5 minutes (almanac known; initial position and time unknown)
•
SkySearch:
5 minutes (no data known)
1.7.4.3 Sentence Rate
1 second default; NMEA 0183 output interval configurable from 1 to 900 seconds in 1-second increments
1.7.4.4 Accuracy
•
GPS Standard Positioning Service (SPS)
Position:
<15 meters, 95% typical (100 meters with Selective Availability on)
Velocity:
0.1 knot RMS steady state
•
DGPS (USCG/RTCM)
Position:
3–5 meters, 95% typical
Velocity:
0.1 knot RMS steady state
•
DGPS (WAAS)
Position:
<3 meters, 95% typical
Velocity:
0.1 knot RMS steady state
•
PPS Time:
±1 microsecond at rising edge of PPS pulse (subject to Selective Availability)
•
Dynamics:
999 knots velocity (only limited at altitude greater than 60,000 feet), 6g dynamics
1.7.5
Interfaces
•
True RS-232 output, asynchronous serial input compatible with RS-232 or TTL voltage levels, RS-232 polarity.
•
User selectable baud rate: 300, 600, 1200, 2400, 4800, 9600, 19200, or 38400.
1.7.5.1 Port 1
•
Configurable between NMEA 0183 Versions 2.00 and 3.00
•
ASCII output sentences GPALM, GPGGA, GPGLL, GPGSA, GPGSV, GPRMC, GPVTG (NMEA-approved
sentences); PGRMB, PGRME, PGRMF, PGRMM, PGRMT, and PGRMV (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
Differential Reference Station ID and RTCM Data age
Geometry and error estimates
•
NMEA 0183 Inputs (see Section
4.1 Received NMEA 0183 Sentences
for full protocol specifications)
Initial position, date, and time (not required)
Earth datum and differential mode configuration command, PPS Enable, GPS satellite almanac
•
Configurable for binary data output including GPS carrier phase data
1.7.5.2 Port 2
Real-time Differential Correction input (RTCM SC-104 message types 1, 2, 3, 7, and 9)
1.7.5.3 PPS
1 Hz pulse, programmable width, 1
µ
s accuracy
1.7.5.4 Power Control
•
Off:
Open circuit
•
On:
Ground, or pull to low logic level <0.3 volts