Current Research Projects

Prof. I-Tai Lu

Grumman – Sensor ManagementDevelopment of phenomenology and modeling for determining the effects of electromagnetic interference and electromagnetic compatibility (EMI/EMC) on, and as a result of adjunct ISR (intelligence, surveillance and reconnaissance) sensors for expanded E2-C and EA-6B missions.

E2-C EA-6B

Prof. I-Tai Lu

Haoyun Wu – Wireless Geolocation

• Hyperbolic Localization

(using travel-time differences)– Closed-form Solvers– Accuracy/Ambiguity Analyses– Ambiguity Cipher

• Hybrid Localization Schemes

(using travel-time & arrival angles)

• Positioning Fusion– GPS/Radar/Multilateration

Ambiguity Analyses

FAA Airport Surface Surveillance System @ Dallas by Sensis Corp.

Prof. I-Tai Lu

H.C. Wu – Channel Estimation

Prof. I-Tai Lu

Time Varying Multipath Propagation Environment

Estimate, Track and Predict

•Wireless Channel Variations

•System Characteristics (such as carrier frequency offset, carrier phase, etc.)

Kun-Ju Tsai - Doppler Diversity• Orthogonal Frequency Division Multiplexing System (OFDM) to achieve spectral efficiency• Problem: Time variation channels Doppler spread Destroy Orthogonality Interference• Methodology: Doppler Diversity to reduce

Interference

Prof. I-Tai Lu

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Doppler Channel Spectrum

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Ideal Channel Spectrum

Orthogonal:No Interference

Not Orthogonal:Inter-Carrier Interference