Glossary – NavCom NCT-2030M Rev.C User Manual

Page 45

Advertising
background image

NCT-2030M User Guide - Rev. C

Glossary

.yym files see meteorological files (where yy = two digit
year data was collected).

.yyn files see navigation files (where yy = two digit year
data was collected).

.yyo files see observation files (where yy = two digit
year data was collected).

almanac files an almanac file contains orbit
information, clock corrections, and atmospheric delay
parameters for all satellites tracked. It is transmitted to a
receiver from a satellite and is used by mission planning
software.

alt see

altitude

.


altitude vertical distance above the

ellipsoid

or

geoid

. It

is always stored as height above

ellipsoid

in the

GPS

receiver but can be displayed as height above

ellipsoid

(HAE) or height above

mean sea level

(

MSL

).


antenna phase center (APC) The point in an antenna
where the

GPS

signal from the satellites is received. The

height above ground of the APC must be measured
accurately to ensure accurate

GPS

readings. The APC

height can be calculated by adding the height to an
easily measured point, such as the base of the antenna
mount, to the known distance between this point and
the APC.

APC see

antenna phase center or phase center

.




Glossary-43

Advertising