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Appendices
Test Bed Receiver Subsystem Addendum – Rev 1 49
INPUT/OUTPUT DATA INTERFACE
Serial
Bit rates: 300, 600,1200, 4800, 9600, 19200, 38400, 57600, 115200 bps, user selectable
Default: 9600 bps (GPS GLONASS, GPS GEO)
Connector
DE9P
Electrical format
RS-232C
OUTPUT STROBES
1PPS Output
A one-pulse-per-second Time Sync output. This is a normally high, active low pulse (1 ms )
where the falling edge is the reference.
Measure Out
1 - 10 pulses-per-second output, normally high, active low where the pulse width is 1 ms. The
falling edge is the receiver’s measurement strobe. (Rate is model-dependent.)
Connector
DE9S
The electrical specifications of the strobe signals are as follows:
Output
Voltage (High) > 2.0 VDC
(Low) < 0.55 VDC
Minimum load impedance 1 KΩ
ANTENNA INPUT
Connector
TNC female
Frequency
GPS: L1(1575.42 MHz), L2 (1227.6 MHz) GLONASS: L1(1602 – 1615.5 MHz)
LNA Power Output
Power to the LNA is supplied by the receiver (4.25 – 5.25 V DC @ 0 – 90 mA )
10 MHz INPUT
Connector
BNC female
Sensitivity
0 dBm to +15 dBm into 50 Ω
RECOMMENDED EXTERNAL FREQUENCY REFERENCE SPECIFICATIONS
Frequency
10.000 MHz
Short Term Stability (Allen Variance)
2x10
-11
, 1 second
Accuracy Over Operating Temp. Range
±5 x 10
-12
RF Output Power
+13 dBm into 50 Ω
Output Waveform
Harmonics:
Spurious:
Sine wave
-40 dBc
-80 dBc
Phase Noise @10 Hz:
@100 Hz:
@1 kHz:
-120 dBc/Hz
-140 dBc/Hz
-150 dBc/Hz
RF Output Connector
BNC Female