EndRun Meridian II, Руководство пользователя

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M e r i d i a n I I U s e r M a n u a l 197
"Smarter Timing Solutions"
Appendix
K
Specifications
The following accuracy and stability specifications assume a stationary position (not dynamic mode),
four satellite lock, and the antenna mounted with a full view-of-the-sky.
GPS Receiver:
L1 Band – 1575.42 MHz.
12 Channels, C/A Code (16 correlators).
Static mode and dynamic-platform mode (shipboard only).
15 dB minimum gain at receiver input.
Timing Receiver Autonomous Integrity Monitoring (TRAIM).
TNC connector (female) on rear panel, Zin = 50Ω, 5 VDC to antenna.
Antenna:
TNC connector (female), Zin = 50Ω, 5 VDC input.
In40 dB gain LNA with bandpass filter for out-of-band interference rejection.
Rugged, all-weather housing capable of operation over –40°C to +85°C.
Mounting via 18” long, 3⁄4” pipe with stainless steel clamps.
50’ low-loss RG-59 downlead cable standard.
Extension cables and low noise pre-amplifiers are available.
Time to Lock:
< 5 minutes, typical (TCXO).
< 10 minutes, typical (OCXO/Rb).
< 30 minutes, typical (Cesium).
Timing Characteristics:
Accuracy: < 10 nanoseconds RMS to UTC(USNO) when locked.*
Stability: TDEV < 10 ns, τ < 10
5
seconds, σ
y
( τ ) < 6.0x10
-14
@
τ =10
5
secs.
Stability: TDEV < 2 ns, τ < 10
5
seconds, σ
y
( τ ) < 4.0x10
-14
@
τ =10
5
secs with the RTIC Option.
See Chapter 11 - Real-Time Ionospheric Corrections, Specifications .
User-Calibration: +/- 500 us, 1 ns resolution.
*See GPS-UTC Timing Specifications for details.
Platform:
Operating System Kernel Version: 3.2.2
Slackware Linux Distribution: 14.1
Processor: 1.2 GHz.
RAM: 512M
FLASH: 512M
Alphanumeric Display/Keypad:
Display: Brilliant 16x280 graphical dot-matrix vacuum-fluorescent.
Keypad: Enter, Back, Edit, Right, Left, Up, Down, Help.