Wireless communications and radar for the new millennium
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Wireless Communications and Radar for the New Millennium. Steve Lohmeier. 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)

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Personal background l.jpg
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)


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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


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Examples of Relevant Experience

  • Adaptive/smart antennas

  • RF propagation studies

  • Ultra-wideband radar project to improve railway safety


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Adaptive Antenna Arrays

  • 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.

Main Lobe in Direction of

Desired Signal

Nulls in Directions of

Cochannel Interferers


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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.

Measurement Geometry

Receive

Transmit

Isorange contours

Dual polarization receiving system enclosed in radome


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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

No Detection

Crossing Island

Detection


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Motion and Change Detection Controlled by Ultra-wideband Radar

  • 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

Zone #1

Zone #2

Radar #2


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Clock Controlled by Ultra-wideband Radar

Oscillator

Programmable

Time Delay

Pulse

Generator

Adjustable

Delay

Code

Generator

Correlator

Baseband

SignalProcessing

S/H

Integrator

Multiplier

UWB Radar Transceiver


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Conclusions Controlled by Ultra-wideband Radar

Research partnerships

(particularly ones that are funded)

yield hard work, innovation,

enthusiasm, satisfaction,

and students trained and experienced in wireless and radar technologies.


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