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008e~Ensrr witfa ~ bde~ec~ion s of ground
rmaaIWim~: llmgeas hm b n demonaJQated to
afford QJILP ercrmeaaely valuable Military
caopabili~. & I consequence there is
mnhueal devenogment the* system
~o~etber wi~h refinements in tbeir
o eraaiondl deployment and usage.
J weveu, a number of resopictions exist in
the deployment of these systems
mwhued wialto their xlnm.imPlm oprating
range. "Erie &mum Q erating range is
G.E. Mefie and L.M. MMU-~Q governed by the heig I! t at which the
D W-Farnborough
platform can fly, so for example a radar
Farnborough
a i an aircraft with a ceiling height of
30,MO
Hampshire GU 14 6TD
feet will ordv be able to operate
QUO to about 250 Km before grazing
United Kingdom
inddence is reached. This limitation can
be removed by p9cocilmg the sensor in a
AIPsOmeU
space-based platform. In order to
maximise the military utility of the
The gayload concept covered; by this information produced by the instrument
paper PS that of a low CO&, hieh and 00 allow recognition of targets, a
performance radar sensor capable of desipn goal of 1m has been assumed for
detectinn8 and rceognising suak objects spatla9 rewllu~on.
within &IW imaged scene of be' IEm-th's
surface usiw the Synthetic A~CROUR~ The poaenaiaP advantages of extensive,
Radar (SARf technique ~ ~ a noverail 3
U~RSUR~CR~ fields of view afforded by
system is integrated with (a TACSAT space baed sensors makes then extremely
platform in Low Earth Orbit ($!JdCD) ad, attrasaive for wide area Military
although ~ nly prnssing reference is made surveillance md hence worthy of further
to this feature in the
attention, particularPy with a view to
could anso bavc a
replacing atrborne systems (although it
detection of
should be recognised that there are a
(GMPP).
I
number of inherent technical difficulties
in designing a spaccbrne system that has
me paper provides a parametria Aview similar sensor capabilities).
of sucb a scwx in the light of ah.: target
and backpound features to bc ob%~wed. hge acas of the Emroh's surtace can be
c~ncept is included showing the observed on a periodic basis and more
hardware realisation of a detailad infomation may be obtained by
cmdidsarc system, as well as budpas for dwelling on seleaed areas. Radar also has
the mass, sizc, power and pointing the added advantage of a!l weather
requirements of the instrumknt. daylnigho operation. Recently imaging
Additional design features csmEidescd are radars ($AIR) have begun to demonstrate
the inhencc that short duration missions the capability achievable from
may have on hardware rcdundawcy and space-based systems but use relative1
the effect of short, low dunby-cycle hea platf~r~~ns (eg EM-1 weighs 127 4
observation periods on solar amay and
C C ~ io contains 4 other sensors as
battery sizing.
well ios the SA83 and hence require large
and costly 1 aunch systems and
The gaper concludes by pointing the way infra-structures. Further the
towards a low cost Pi and D dlemowmmr relatively poor resolutions (e6 E k S-1 have is
system allowing a practical investipauion approxijnjitely 30m) makinp them
of the key t@c.iniques and technolcPBes. unsuitabli fiw most Military applications
I and have no inherent capability for the
1 Iatda8d0Eo.s
As a result of the recent UK ASTBW
programme and the deploymenu of US
system such as JSTARS and ASNRS, the
ability to combine information derived
from high resolution imaging radars
detection of ground moving targets. '
27-1
Bg is, Pa~ever, passible to conceive SAR
sensors for integration with various forms
of s d saaelllite glaaoP~m and depending
on the type of platform used to carry the
sensor, different options exist for its