university of kansas department of electrical engineering and computer science 1 radar systems and...
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University of KansasDepartment of Electrical Engineering and Computer Science
1Radar Systems and Remote Sensing Lab
Information and Telecommunication Technology Center
Wireless Communications and Radar for the New Millennium
Steve Lohmeier
University of KansasDepartment of Electrical Engineering and Computer Science
2Radar Systems and Remote Sensing Lab
Information and Telecommunication Technology Center
Personal Background
• 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)
University of KansasDepartment of Electrical Engineering and Computer Science
3Radar Systems and Remote Sensing Lab
Information and Telecommunication Technology Center
Research Interests
• 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
University of KansasDepartment of Electrical Engineering and Computer Science
4Radar Systems and Remote Sensing Lab
Information and Telecommunication Technology Center
Examples of Relevant Experience
• Adaptive/smart antennas• RF propagation studies• Ultra-wideband radar project
to improve railway safety
University of KansasDepartment of Electrical Engineering and Computer Science
5Radar Systems and Remote Sensing Lab
Information and Telecommunication Technology Center
Adaptive Antenna Arrays
Nulls in Directions of Cochannel Interferers
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 air-defense radars, but focusing more on wireless application
• Applicable to PCS, wireless local loops, etc.
University of KansasDepartment of Electrical Engineering and Computer Science
6Radar Systems and Remote Sensing Lab
Information and Telecommunication Technology Center
RF Propagation Studies
• 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.
Dual polarization receiving system enclosed in radome
Measurement Geometry
Isorange contours
Transmit
Receive
University of KansasDepartment of Electrical Engineering and Computer Science
7Radar Systems and Remote Sensing Lab
Information and Telecommunication Technology Center
Improving Railway Safety Using Four Quadrant Gates Controlled by Ultra-wideband Radar
• 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
Crossing IslandDetection
No Detection
University of KansasDepartment of Electrical Engineering and Computer Science
8Radar Systems and Remote Sensing Lab
Information and Telecommunication Technology Center
Motion and Change Detection
• Radar range profile is constantly compared to its previous version. If a sufficient change in the profile occurs a vehicle detection is declared.
Radar #1
Radar #2
Zone #2
Zone #1
University of KansasDepartment of Electrical Engineering and Computer Science
9Radar Systems and Remote Sensing Lab
Information and Telecommunication Technology Center
UWB Radar Transceiver
CorrelatorCorrelator
ClockOscillator
Integrator
PulseGenerator
CodeGenerator
Multiplier
ProgrammableTime Delay
S/HBaseband
SignalProcessing
AdjustableDelay
University of KansasDepartment of Electrical Engineering and Computer Science
10
Radar Systems and Remote Sensing Lab
Information and Telecommunication Technology Center
Conclusions
Research partnerships
(particularly ones that are funded)
yield hard work, innovation,
enthusiasm, satisfaction,
and students trained and experienced in wireless and radar technologies.