12.3 I/O Configuration
117
12.2.3
Position Accuracy (rms)
2 meters, rms with SA (USA Department of Defense Selective Availability) OFF.
12.2.4
Satellite Tracking
Thirty-two (32) channel receiver, C/A code (1575.42 MHz)
The receiver simultaneously tracks up to thirty-two satellites. Results from all tracked satellites are averaged
and determined by least-squares estimation.
12.2.5
GNSS Acquisition Time
•
40 seconds typical, cold start
•
25 minutes, 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.
Содержание 1201B
Страница 4: ...iv ...
Страница 153: ...B 7 Four Fiber Optic Outputs 135 Figure B 4 Jumper Locations ...
Страница 155: ...B 8 8 Channel High Drive IRIG B Amplifier 137 Figure B 5 8 High Drive Outputs Jumper Locations ...
Страница 171: ...B 10 Four Additional Outputs and Dry Contacts 25 50 Vdc 153 Figure B 7 Option Connector Signal Locations ...
Страница 222: ...Appendix E Statement of Compliance The following page is a statement of compliance that includes Model 1201B and 1201C ...