NavCom LAND-PAK Rev.N - Manual (Page 190)

Technical Reference Manual Rev. N
- Glossary 188
HAE see altitude, and ellipsoid.
IODC Issue of Data, Clock - The IODC indicates the issue number of the data set and thereby
provides the user with a convenient means of detecting any change in the correction
parameters. The transmitted IODC will be different from any value transmitted by the satellite
during the preceding seven days.
JPL Jet Propulsion Laboratory.
Kbps kilobits per second.
L-Band the group of radio frequencies extending from approximately 400MHz to approximately
1600MHz. The GPS carrier frequencies L1 (1575.4MHz) and L2 (1227.6 MHz) are in the L-
Band range.
L1 carrier frequency the primary L-Band carrier used by GPS satellites to transmit satellite
data. The frequency is 1575.42MHz. It is modulated by C/A code, P-code, or Y-code, and a 50
bit/second navigation message. The bandwidth of this signal is 1.023MHz.
L2 carrier frequency the secondary L-Band carrier used by GPS satellites to transmit satellite
data. The frequency is 1227.6MHz. It is modulated by P-code, or Y-code, and a 50 bit/second
navigation message. The bandwidth of this signal is 10.23MHz.
lat see latitude.
latitude (lat) the north/south component of the coordinate of a point on the surface on the earth;
expressed in angular measurement from the plane of the equator to a line from the center of the
earth to the point of interest. Often abbreviated as Lat.
LED acronym for Light Emitting Diode.
LEMO a type of data or power connector.
LES Land Earth Station the point on the earth’s surface where data is up linked to a satellite.
logging interval the frequency at which positions generated by the receiver are logged to data
files.
lon see longitude.
longitude (long) the east/west component of the coordinate of a point on the surface of the
earth; expressed as an angular measurement from the plane that passes through the earth’s
axis of rotation and the 0° meridian and the plane that passes through the axis of rotation and
the point of interest. Often abbreviated as Long.
Mean Sea Level (MSL) a vertical surface that represents sea level.
meridian one of the lines joining the north and south poles at right angles to the equator,
designated by degrees of longitude, from 0° at Greenwich to 180°.
meteorological (.YYm) files one of the three file types that make up the RINEX file format.
Where YY indicates the last two digits of the year the data was collected. A meteorological file
contains atmospheric information.
MSAS (MTSAT Satellite-based Augmentation System) a Japanese satellite system that
provides a set of corrections for the GPS satellites, which are valid for the Japanese region.
They incorporate satellite orbit and clock corrections.
MSL see Mean Sea Level.
multipath error a positioning error resulting from interference between radio waves that has
traveled between the transmitter and the receiver by two paths of different electrical lengths.