110
Technical Specifications and Operating Parameters
12.2.3
Position Accuracy (rms)
2 meters, rms with SA (USA Department of Defense Selective Availability) OFF.
12.2.4
Satellite Tracking
Seventy-two (72) channel receiver: GPS L1C/A, GLONASS L1OF, Galileo E1B/C, BeiDou B1
The receiver simultaneously tracks up to 72 satellites.
12.2.5
GNSS Acquisition Time
55 seconds typical, cold start
25 seconds, typical, warm start
3 seconds, typical, hot start
12.3
I/O Configuration
Input and output signals may be selected on specified connector by means of internal push-on jumpers (see
Chapter 5 for jumper selection tables). Each output channel is independently buffered.
12.3.1
I/O Connectors: Main Board
I/O connectors may be configured to any one of the output signals or a specific input function as listed
below:
Port 1: IRIG-B unmodulated, 1 PPS, Programmable Pulse or Event Input; jumper selectable
Port 2: IRIG-B modulated, 1 PPS, Programmable Pulse, IRIG-B unmodulated or Event Input; jumper
selectable
Port 3: IRIG-B unmodulated, 1 PPS, Programmable Pulse or Event Input; jumper selectable
12.3.2
Standard Output Signals
IRIG-B: 1 kHz modulated, 4.5 Vpp, 3 Vpp with 50 Ω load, 20 Ω source impedance
IRIG-B: 5 V CMOS level-shift (unmodulated), 10 Ω source impedance;
±
75 mA drive
1 PPS: 5 V CMOS, 10 Ω source impedance;
±
75 mA drive
Programmable Pulse: 5 V CMOS, 10 Ω source impedance;
±
75 mA drive
12.3.3
Event Input/1 PPS Deviation
Available on ports 1 to 3, COM1, or Four (optional) BNC Connectors
This input has a 100 ns timing resolution, and may be configured to record up to 50 sequential events,
provided that the events are separated by at least 11 ms. The event log may be read later from the
front panel or RS-232 interface. A command is also provided to clear the event log. Event data is
stored in battery-backed RAM.
The Event input may also be configured to accept an external 1 PPS signal, and measure the deviation
from a 1 PPS GNSS signal with 100 ns resolution.
12.3.4
Multifunction Relay
Relay may operate under several clock conditions, including: (1) out of lock, (2) alarms, (3) faults, (4) clock
not stabilized, and (5) failsafe.