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2.
K.
Microwave Landing System (MLS)
(1)
General
The ML-850
MLS
Receiver
is designed
for use with
the C-band Time
Referenced Scanning Beam MLS as defined in 1986 by
ICAO.
Ground
stations conforming to the previous
ICAO
definition
(predominantly
European)
are not compatible
with
this receiver
as they did not
provide
for magnetic heading selection of runway centerline.
The MLS
system provides 200 channels between 5031.0 and 5090.7 MHz.
The signal format is time multiplexed with each function (azimuth,
elevation, basic data, auxiliary data, and back azimuth) transmitted
sequentially on a single frequency. Each function is identified by
an encoded preamble, followed by TO and FRO scanning beam signals or
more digital data depending on the function.
Basic data from the ground is
used to determine runway length
for
azimuth scaling, proportional coverage limits, minimum glidepath,
runway heading and station identification.
The receiver also
processes
and
outputs
auxiliary
data
which
pertains
to
the
ground
station
for use by other systems such as EDS, AFCS, FMS< or RNAV
equipment.
The ML-850 receiver system provides guidance to the azimuth and
glidepath angles selected on the control unit or transmitted
from
the ground station.
Guidance is output from the receiver
in the
form of digital
deviation
signals
intended
to drive
conventional
course
deviation
indicator
(CDI)
displays.
The MLS receiver scales
and biases these ARINC 429 labels to the corresponding
ILS mV per
dots of deviation allowing integration to the autopilot and display
on the EDS.
The receiver computes the centers of the received TO and FRO scans,
calculates the aircraft position angle for each scan, and subtracts
the selected angle to derive deviations.
Approach azimuth angles may be selected from the runway centerline
out to the limits of the proportional coverage area of the ground
station.
This angle is entered as the approach magnetic heading.
Azimuth deviations
are scaled as a function of runway lengths.
Glidepath angles
may
be selected from the minimum safe angle
for the
desired runway heading (as transmitted from the ground station) to
the maximum allowable glidepath angle of 4 degrees for the
G-IV.
Glidepath
deviations
are scaled
as a function
of the
selected
glidepath
angle.
22-14-00
Page
298.36.12
Apr 15/93
Use
or
disclosure
of
information
on
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page
is subject
to
the
restrictions
on
the
title
page
of
this
document.
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