Electrical Characteristics
General
Frequency L1, 1575.42 MHz
C/A code 1.023 MHz chip rate
Channels 16
Sensitivity
Tracking -152dBm typ
Acquisition -139dBm typ
Accuracy
Position 7 meters CEP (90%) horizontal, SA off.
Velocity 0.1 meters/second
Time 1 microsecond synchronized to GPS time
Datum
Default WGS-84
Other Support different datum by request
Acquisition Rate (Open sky, stationary requirements)
Hot start 12 sec, average
Warm start 38 sec, average
Cold start 60 sec, average
Dynamic Conditions
Altitude 10,000 meters max
Horizontal Velocity 300 kilometers/hour max
Vertical Velocity 36 kilometers/hour max
Acceleration 2g, max
Jerk 4 meters/second3, max
Power
Main power input 3.3 ±5% VDC input.
Supply Current ZX4125 27 mA @ 3.3V(Continuous mode)
ZX4125P 33 mA @ 3.3V (Continuous mode)
including LNA
Serial Port
Electrical interface one full duplex serial communication, TTL
interface
Protocol message NMEA-0183, version 3.0 optional.
Default NMEA GGA, GSA, GSV, RMC and VTC. 9600 baud
rate, 8 bits data, 1 start, 1 stop, no parity.
(GSA, & GSV is 3 sec output 1 msg, option baud
rate: 4800, 19200, 38400)
Time-1PPS Pulse (optional)
Level TTL
Pulse duration 100ms
Time reference at the pulse positive edge
Measurements Aligned to GPS second, +-1 microsecond
Recommended External Antenna Specification
Gain 20dB (including cable loss)
Noise figure 1.5dB
Current 3 ~ 30mA
Operate Voltage 2.5 ~ 2.8V
Environmental Characterisitics
Operating temperature range -40 deg. C to +80 deg. C
Storage temperature range -55 deg. C to +100 deg .C
Physical Characteristics
Dimension : ZX4125 1.043' x 1.043' x 0.11' (26.5 x 26.5 x 3.0 mm)
ZX4125P 1.043' x 1.043' x 0.27' (26.5 x 26.5 x 7.0 mm)
Weight : ZX4125 3.4g
ZX4125P
Antenna connector: 1.27 mm pitch 3 pin board to board
Interface connector: 1.27 mm pitch 10 pin / 6 pin board to board
Remarks: Difference between ZX4125 & ZX4125P.
ZX4125: one rf input with antenna detector.
(Use Active antenna only)
ZX4125P: two rf input with auto switch.
(One patch antenna, one external antenna)
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