Digital Array Radar Technology for MPAR
Digital Array Radar Technology for MPAR
Digital Array Radar Technology for MPAR
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Introduction: <strong>Digital</strong> <strong>Array</strong> <strong>Radar</strong><br />
Past: Passive <strong>Array</strong><br />
Present: Active <strong>Array</strong> (Digitized Subarray)<br />
Future/Now: <strong>Digital</strong> <strong>Array</strong><br />
-Phase shifter/attenuator per element<br />
-Enables fast beam switching<br />
-Losses on both Tx. & Rx.<br />
-Fixed, metal beam<strong>for</strong>mer<br />
-Single points of failure<br />
5/2/2011<br />
HP<br />
Duplexer<br />
Tube<br />
Amp<br />
Wave<strong>for</strong>m<br />
Generator<br />
Analog<br />
Beam<strong>for</strong>mer<br />
LNA<br />
Receiver<br />
and A/D<br />
Processor &<br />
Controller<br />
T/R<br />
T/R<br />
T/R<br />
T/R<br />
T/R<br />
T/R<br />
T/R<br />
T/R<br />
T/R<br />
Analog<br />
BF Analog<br />
BF Analog<br />
BF<br />
Wave<strong>for</strong>m<br />
Generator(s)<br />
Processor &<br />
Controller<br />
Receivers<br />
and A/D<br />
-LNA, HPA, phase shifter, attenuator,<br />
duplexer, T/R switches per element<br />
-All RF parts handle less power<br />
-Lower RF losses<br />
-More wave<strong>for</strong>m agility<br />
-”Graceful degradation”<br />
-Multiple beams possible w/adaptivity<br />
-Mixing/digitization at subarrays<br />
Advanced<br />
Integration<br />
Difficult to<br />
functionally<br />
“separate”<br />
the sections<br />
T/R<br />
T/R<br />
T/R<br />
T/R<br />
T/R<br />
T/R<br />
T/R<br />
T/R<br />
T/R<br />
Xcvr.<br />
Xcvr.<br />
Xcvr.<br />
Xcvr.<br />
Xcvr.<br />
Xcvr.<br />
Xcvr.<br />
Xcvr.<br />
Xcvr.<br />
A/D+DDS<br />
A/D+DDS<br />
A/D+DDS<br />
A/D+DDS<br />
A/D+DDS<br />
A/D+DDS<br />
A/D+DDS<br />
A/D+DDS<br />
A/D+DDS<br />
<strong>Digital</strong><br />
Backend<br />
Proc. & Controller<br />
-Transceiver, digitizer, and DDS <strong>for</strong><br />
each element<br />
-Multiple beams and adaptive<br />
beam<strong>for</strong>ming limited by I/O and<br />
processing only, not RF hardware<br />
-Ultimate in wave<strong>for</strong>m agility<br />
-High dynamic range potential<br />
-Multiple concurrent functions<br />
Images: W. Weedon, Applied <strong>Radar</strong>, Inc. J. Herd, MIT LL, and S. Kemkemian et. al, Thales, at Phased <strong>Array</strong> Conf., 2010. www.militaryaerospace.com radar.jpl.nasa.gov<br />
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