University of Kansas
Department of Electrical Engineering and Computer Science
Wireless Communications and Radar
for the New Millennium
Steve Lohmeier
Radar Systems and
Remote Sensing Lab
1
Information and
Telecommunication
Technology Center
University of Kansas
Department of Electrical Engineering and Computer Science
Personal Background
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Born and raised in Kansas City area
Received B.S.E.E. from Kansas State University
Received M.S. and Ph.D. from University of Massachusetts working on
radar remote sensing problems (6 years)
Worked on air and missile defense radars in Huntsville, AL (4 years)
Currently on faculty at University of Kansas (1 year)
Radar Systems and
Remote Sensing Lab
2
Information and
Telecommunication
Technology Center
University of Kansas
Department of Electrical Engineering and Computer Science
Research Interests
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General
– Antennas
– Propagation
– Sensor systems
Specific
– Digital beamforming and adaptive array processing (smart
antennas)
– Ultra-wideband radios and radar
– Bistatic scattering from natural surfaces (clutter) and multipath
interactions
– Radar remote sensing
Radar Systems and
Remote Sensing Lab
3
Information and
Telecommunication
Technology Center
University of Kansas
Department of Electrical Engineering and Computer Science
Examples of Relevant Experience
• Adaptive/smart antennas
• RF propagation studies
• Ultra-wideband radar project
to improve railway safety
Radar Systems and
Remote Sensing Lab
4
Information and
Telecommunication
Technology Center
University of Kansas
Department of Electrical Engineering and Computer Science
Adaptive Antenna Arrays
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Main Lobe in Direction of
Desired Signal
Adaptive processing
techniques originally
implemented in speech
processing and sonar
applications
Migrated to radar and
wireless fields
Teaching course in spring on
adaptive antenna arrays
based on experience with airdefense radars, but focusing
more on wireless application
Applicable to PCS, wireless
local loops, etc.
Radar Systems and
Remote Sensing Lab
Nulls in Directions of
Cochannel Interferers
5
Information and
Telecommunication
Technology Center
University of Kansas
Department of Electrical Engineering and Computer Science
RF Propagation Studies
Measurement Geometry
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Involved in a program with MIT
Lincoln Lab to characterize
bistatic scattering from terrain
for use in multipath models
Involved in many other
programs to characterize all
facets of the RF propagation
environment (attenuation,
clutter, multipath, interference,
etc.)
Applicable to future generation
PCS wireless local loop design,
indoor wireless network design,
etc.
Radar Systems and
Remote Sensing Lab
Receive
Transmit
Isorange contours
Dual polarization receiving system
enclosed in radome
6
Information and
Telecommunication
Technology Center
University of Kansas
Department of Electrical Engineering and Computer Science
Improving Railway Safety Using Four Quadrant Gates
Controlled by Ultra-wideband Radar
No Detection
Crossing Island
Detection
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Four-quadrant crossing controlled by two entrance and two exit gates
Exit gates are raised if vehicle is detected in entirely or partially within crossing island
Radar Systems and
Remote Sensing Lab
7
Information and
Telecommunication
Technology Center
University of Kansas
Department of Electrical Engineering and Computer Science
Motion and Change Detection
Radar #1
Zone #1
Zone #2
Radar #2
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Radar range profile is constantly compared to its previous version. If a sufficient change in
the profile occurs a vehicle detection is declared.
Radar Systems and
Remote Sensing Lab
8
Information and
Telecommunication
Technology Center
University of Kansas
Department of Electrical Engineering and Computer Science
UWB Radar Transceiver
Clock
Oscillator
Programmable
Time Delay
Pulse
Generator
Adjustable
Delay
Code
Generator
Correlator
Baseband
Signal
Processing
Radar Systems and
Remote Sensing Lab
S/H
Integrator
9
Multiplier
Information and
Telecommunication
Technology Center
University of Kansas
Department of Electrical Engineering and Computer Science
Conclusions
Research partnerships
(particularly ones that are funded)
yield hard work, innovation,
enthusiasm, satisfaction,
and students trained and
experienced in wireless and
radar technologies.
Radar Systems and
Remote Sensing Lab
1
Information and
Telecommunication
Technology Center