LMS Propagation Channel at L- and S-bands Narrowband Experimental Data and Channel Modelling

to investigate
propagation amount
impairments of data obtained. applications
Mobile a large the
Satellite analutilised Cumulaelevation
communication
environments projects.
at 27 ° of elevation France :_ 13 ° to 39 °. Specific
programme a range
of elevation
equipment areas bridges greater
set-ups
can be found by the operating problem
has been and design
framework
experimental results of Fades (DoF)
is presently paper. at different
also for channel tive Distribution angles and
environments
A representative descriptions One of the
of the major
environmental problem
characteristics in our
encountered
of characterisation
184
for some
specific
experimental ranges and campaigns.
also presented
2
The project signal
ESA
first ESA called up-linked
LMS
involvement PROSAT
experimental
in LMS was first from frequency first phase rural, experimental started. an ESA of the of the wooded The ground
experimental in different
in North
Yorkshire
cooperation with the British Radiocommunication were collected in different areas and at elevation given in [3-5].
modelling
characterisation,
ESA has
embarked
in a number
of
involving both experimental order statistics describing the angles urban) purposes from and they and prediction frequencies and
requirement buildings, to address angles for users of these (1.3 and
for LMS systems specifically the
at low elevation of characterising elliptical at mean
in the PROSAT project covered at L-band was
larger than at S-band. data base it was then extent, follows: • Open environment; a unique
In order to obtain a more congruent and comprehensive experimental decided to carry out additional analyses to establish, at the maximum level. The parameters characterising the environments are given as
satellite. Netherlands part of the environments, on the
unmodulated project, and took suburban place angles
of 1.54 GHz.
measurements areas in 1987 from
in open experimental covering
due to frequent LMS propagation in excess out
blockage research channel of 50 ° . (UK), in
so forth.
It was therefore
to undertake configurations, angles was carried
campaigns
measurements field station tests were dates carried in the were in Sweden, back out (Spain) down-link taken to 1983 by when the
using channel
a CW was and The in
data
or equivalently at system
empirical-statistical and subsystem levels.
channel
models
however
studies and
In the field of LMS research first and wooded, models projects second suburban for fade
at elevation allows In view S-bands
40borne
for instance, at L- and
in Northern considerations, 2.6 GHz,
latitudes respectively)
N94-14669
Characterisation Channel at Experimental of the LMS L- and S-bands: Data and Channel Propagation Narrowband Modelling
Mario
Sforza,
Sergio
Buonomo
in [1,2]. PROSAT project decided orbit campaign locations results angles, the elevation was
of the
problem
identified and then
the
margin by trees, activities
The
European
Space 1, 2200
Research
and
Technology The
Centre
Keplerlaan
AG Noordwijk,
Netherlands
Abstract
During perimental (LMS) elevation yses are the future the period campaigns angles, currently ESA 1983-1992 channel. used LMS modelling Functions for system This (PDF) have been purposes the European the A substantial and frequencies planning and and comprehensive preliminary Duration Space Agency (ESA) has of the covering Results within base in this data are given statistics carried Land quite from the out several range data exof of
also included.
1
In the mobile coding tional signal
Introduction
design schemes geostationary blockage stages of an LMS channel performance, LMS due to man-made can be effectively orbit communication to assess robustness fade obstacles by means in the latter system link and information availability other are usually system regarding objectives, parameters. required effects. advantage the satellite-toand convenfor propagain stable in-built For These of the
data on features (open, derived Empirical
are reported
for elevation
20 ° up to 80 °, for several frequency and elevation