2. SPECIFICATION
2.1. ABSOLUTE MAXIMUM RATING
Parameter
Min
Typ
Max
Units
Power Supply Voltage
3.1
3.3
3.5
V
Operating Current
67
75
82
mA
2.2. GEOHELIX-SMP GPS ANTENNA CHARACTERISTICS
Unit
Frequency
1573.42
1575.42
1577.42
MHz
Gain
-5.5
-3.5
dBic
Beamwidth
>120
Degrees
VSWR
2.0:1
2.3:1
Impedance
50
Ω
Operating Temperature Range
-40
+20
+85
℃
2.3. GPS TECHNICAL SPECIFICATION
ITEMS
DESCRIPTION
Chipset
GRF3w&GSP3f
SiRF StarIII technology
General
L1, 1575.42 MHz
C/A code
1.023 MHz chip rate
Channels
20
Accuracy
Position
10 meters, 2D RMS
5 meters 2D RMS, WAAS enabled
< 5meters(50%), DGPS corrected
Velocity
0.1 meters/second
Time
1 microsecond synchronized to GPS time
Datum
Default
WGS-84
Other
selectable for other Datum
Time to First Fix (Open Sky & Stationary Requirements)
Reacquisition
0.1 sec., average
Snap start
1 sec., average
Hot start
8 sec., average
Warm start
38 sec., average
Cold start
42 sec., average
Dynamic
Conditions
Altitude
18,000 meters (60,000 feet) max.
515 meters/second (1000 knots) max.
Acceleration
Less than 4g
Jerk
20 meters/second3, max.
Power
Main power input
3.3 ± 5%V DC input.
Power consumption
Less than 250 mW (Continuous mode)
Supply Current
≈75 mA (Continuous mode)
Backup Power
See section 2.9 PIN DESCRIPTION Pin#7
Serial Port
Electrical interface
One full duplex serial TTL UART interface.
Protocol messages
NMEA-0183@4800 bps (Default)
Timemark-1PPS Pulse(Customization
Device)
Level
TTL
Pulse duration
100ms
Time reference
At the pulse positive edge.
Measurements
Aligned to GPS second, ±1 microsecond
2.4. EXTERNAL BACKUP POWER CONDITIONS
PARAMETER
Symbol
RTC(Battery) Power
BATTERY
2.0
5.0
15
µA
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