1 Detection of Cellular Activity Within A Defined Space Undergraduate Project – Final Presentation Spring 2008 Doron BrotEyal Cimet Supervisor:Yossi Hipsh ! Department of Electrical Engineering High-Speed Digital Systems Laboratory

2 The Main Objective 2 Detection and Positioning of Cellular Phone Activity In a Defined Space Where Cellular Use is Unwanted

3 Main System Requirements Detection and Positioning of Transmitting Cellular Phone Desired Spatial Resolution & Accuracy: Required Temporal Resolution: Compatibility with all Cellular Providers Detection Regardless of Phone Orientation – Reception of all Linear Polarizations Ability to Handle Simultaneous Events Ability to Distinguish Between Original Signal and Multi-path Reflection 3

4 Solution Overview Coverage of the Defined Space: Area Split to Lower the Required Dynamic Range Antennas

5 System Operation Process Sampling Angle Measurement Multi-path Filtering Filtering of Dummy Origins Origin Estimation Idle / Trigger Triangulation Positioning Storage Start

6 Angle Measurement Multi-beam Arrays – MBA: –Antennas Sensitive to Many Spatial Directions Simultaneously, Ideal for Angle Measurement –Differential Angle Measurement –Distance From Source Determines Signal Strength

7 Antenna 1Antenna 2 Origin of Signal is Estimated Based on Angle of Incidence with 2 MBA Antennas and Table Height:

8 Multi-path Reflections Received Simultaneously Must Be Filtered Out Antenna 1Antenna 2

9 Final Design 90-Degree Hybrid Frequency Multiplexer Band 1 12 dB Amp BPF DCA Detector A/D Band 2 Band 3 Band 9 Horizontal MBA Vertical MBA Omni-directional Antenna 12 dB Amp BPF Detector A/D Digital Controller (CPU) Display A/D Trigger Front-End Customized Filter to All 9 Bands

10 Proof of Feasibility - System Strip-Down Original DesignSimplification Full Cellular SpectrumOne Frequency All Linear PolarizationsOne Polarization Original HardwareMBA, Amplifiers and Hardware Included in Digitizing Scope

11 Feasibility Experiment Pos 1Pos 2 1 [m] 1.8 [m] 2.3 [m] H=1.7 [m] H=2 [m] H=2.6 [m]

12 Version Using Power Detectors 12 dB Amp Horizontal MBA Antenna 1 Beam 1 Beam 2 Horizontal MBA Antenna 2 Beam 1 Beam 2 12 dB Amp Power Detector CH 1 CH 2 CH 3 CH 4 Scope Regular Low-Frequency Scope The Minimal System for Proof of Feasibility(2)

13 Our Measurements: Antenna Measurement System Protractor Transmitting antenna CH 1 CH 2 CH 3 CH 4 Scope: Rotating tableAntenna Pulse Generator

14 Antenna Measurements Beam 1 Beam 2 Spatial Response of MBA [ dB ]

15 Power Amplifier Measurement The system : The 2 Outputs will be compared to measure gain Results:

Conclusion In this project, a full system that is capable of positioning a cellular activity in a defined space was designed. The system was simplified on order to perform feasibility checks The separate components were measured but the full feasibility check was not completed 16