| GH81 Specifications |
| Numbers of channels |
16 parallel channels |
| Search Engine |
256 co-relaters (16 per channel) |
| Method |
Parallel reception |
| Frequency |
L1, 1575.42 MHz |
| Tracking code |
C/A code only |
| Tracking capability |
Code plus carrier tracking |
| 12 satellites simultaneously (8 channels in sleep mode) |
| Sensitivity |
Tracking: -139 dBm (typ) |
| Acquiring: -133 dBm (typ) |
| Accuracy |
Horizontal (2drms): 15m (24 hour average at fixed position) |
| Vertical (2drms): 22m (24 hour average at fixed position) |
Velocity: +- 01.km/h (1 sigma) @ better than
-130 dBm and over 40km/h |
| Azimuth: +- 0.2 degree (1 sigma) @ better than -130dBm and 45 +- 0.1 degree |
| Supply Voltage |
2.9 to 3.6 VDC |
| Supply Current at 3.3VDC |
Continuous Op = 22mA (Searching) 17mA (Tracking) |
| Short term Sleep (5 second) = 6.7mA (typical) |
| Low Power Mode = 2.8mA (typical) |
| Back-up Power Supply |
Voltage: 2.1 to 3.6 VDC to Operation Voltage |
| Current: 10uA @ vcc=0v;220uA @ Vcc=3.3v |
| Interface |
3.3 VDC C-MOS |
| Baud Rate |
9.6k bps |
| Protocol |
Furuno Binary |
| Data Output Rate |
Continuous Operation = 1 second |
| Short Term Sleep = selectable 1 to 10 seconds in units of 1 second |
| Long Term Sleep = selectable 10 to 60 seconds in units of 1 second |
| Dynamics |
Speed = 300 km/h |
| Acceleration = 1.2G |
| Datum |
WGS-84 (default) and 254 other datums |
| Operation temperature |
-30 to +80 °C |
| Storage temperature |
-40 to +85 °C |
| TTFF average |
| Hot start (See note 1) |
9 seconds |
| Warm start (See note 2) |
37 seconds |
| Cold start (see note 3) |
52 seconds |
| Re-acquisition time at fixed position |
| Shut-off time 10 sec |
3 seconds average |
| Note 1: |
All following information available; Almanac, Ephemeris (fresh within 4 hours), date, time and estimated position. |
| Note 2: |
Following information available; Almanac, date, time and estimated position. Ephemeris not available. |
| Note 3: |
None of the following information available; Almanac, Ephemeris, date, time and estimated position. |
The basic performance of GH81 listed here is verified in the actual tests conducted in August 2002 in all categories except those described otherwise. Please note all GPS receivers are subject to degradation when Selective Availability (SA) is activated by the U. S. Department of Defense, although, as of May 1st, 2000, it has been deactivated.
All specifications above are subject to change without prior notice.
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