Technical data

Tables
HDOP Horizontal Dilution of Precision.
IC Integrated Circuit.
ICD Interface Control Document
I/O Input - Output
IODE Issue of Data Ephemeris
IRQ Interrupt Request
Kalman Filter Mathematical process used to smooth out measurement
errors of pseudo-ranges and carrier phases of tracked
satellites. For example ‘8 states’ refers to filtering of position
and time (i.e. x,y,z and t) and the rate of change of each.
knot Nautical mile per hour
L1 The 1575.42 MHz frequency radiated by GPS satellites.
L-band The band of radio frequencies between 1 and 2 GHz
Lithium A metallic element (used in batteries)
LMT Local Mean Time
mA Milliamp (of current)
Macro Text containing frequently used operations which can be
executed as a single command (DM only)
MHz Megahertz, i.e. one million cycles per second
mph Miles per Hour.
MSL Mean Sea Level = geoidal height = 0
MIL-STD Military Standard
Multiplexing A receiver channel can track multiple satellites by
switching rapidly between them so as to gather all data
transmissions
GPS Timing Receiver Installation and Operation Manual
E-4