Viavi AVX-10K Operation Manual page 253

Chapter D Appendix D. Terminology
Appendix D. Terminology
Term
Label 165
Leg
Loop Gain Margin
LRRA
LRU
MDS
Profile
Pulse Radio
Altimeter
Sweep Rate
Test Port
UUT
Rev 004
D - 4
Ta bl e D -1 A p pe nd ix D . T er mino lo gy
ARINC 429 BCD data word for radio height. An altitude data
output format for ARINC -707 radio altimeters. May also be
output on ARINC-707 radio altimeter test ports.
A linear altitude ramp, either climbing, level altitude or
descending.
1. If climbing or descending the ramp is defined by start
altitude, stop altitude and altitude rate.
2. If level (start altitude= stop altitude), the ramp is defined by
duration.
The reflected signal amplitude seen at the radio altimeter
receiver that is X dB's above the receiver MDS
Low Range Radio Altimeter. Range typically up to 8,000 ft
Line Replaceable Unit. Would normally refer to the radio
altimeter transmitter/receiver unit however, an indicator is
also an LRU.
Minimum Discernible Signal Level. A term used to express
radar receiver sensitivity in -dBms
A sequence of legs forming a simulated flight path i.e.
approach
The altimeter measures the time delay between a transmitted
RF pulse and the reply from the ground.
The rate of the triangular frequency modulation of an FMCW
radio altimeter expressed in Hz. This is usually constant for a
given system. CDF FMCW systems will have a saw tooth
frequency modulation, where the sweep rate is proportional
to altitude.
A port provisioned on some radio altimeters, that may
provide the following.
1. BITE data output
2. Radio Height in the form of DC altitude, Audio Frequency
Altitude or Digital Altitude.
3. Analog trips
4. System flags
Unit Under Test
AVX-10K Operation Manual
Description
22135254
January 2024