Symmetricom GPS Antenna, Руководство по установке

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GPS Antenna Sets
Glossary
GLOSSARY
(ONLY NON-STANDARD ABBREVIATIONS ARE LISTED)
EC European Council
EN Europäische Norm
Abbreviation for German expression of European Standard
ESD Electro Static Discharge
The rapid, spontaneous transfer of electrostatic charge induced by a high
electrostatic field.
GPS Global Positioning System
(satellite navigation system)
A satellite-based global navigation system that consists of (a) a constellation of
24 satellites in orbit 18 000 km above the Earth, (b) several on-station (i.e., in-
orbit) spares, and (c) a ground-based control segment. The satellites transmit
signals that are used for extremely accurate three-dimensional (latitude,
longitude, and elevation) global navigation (position determination), and for the
dissemination of precise time.
Hz Hertz
A unit of frequency equal to one cycle per second (cps.).
One kilohertz (kHz) equals 1000 cps;
One megahertz (MHz) equals 1 million cps;
One gigahertz (GHz) equals 1 billion cps.
N Navy Connector
Coaxial Connector with screw type coupling mechanism. Available in 50 Ohm
and 75 Ohm versions. Frequency range DC – 18GHz (50 Ohm) and 1 GHz (75
Ohm) respectively.
RG Symbol used to designate coaxial cables that are made to Government
Specification
e.g., RG58-U, in this designation the “R” means radio frequency, the “G”
means Government, the “58” is number assigned to the government approval,
and the “U” means it is an universal specification.
VA Voltage Ampere
The unit of electrical apparent power. In alternating-current power systems, the
product of the rms voltage and amperage.
VAC Volts, Alternating Current
The unit of electromotive force
VDC Volts, Direct Current
The unit of electromotive force
001023AD – July 2003
Glossary –1