Characterization Presentation

Cellular Device Detection

Instructor : Yossi Hipsh Performed by: Ari Avitzur Asher Pilai

Winter 2008/9Semesterial Project

Project Goals

• Designing & activating a system which detects cellular activity and its specific location in a room.

• By using two phased array antenna’s that each sends a multi beam, The system will detect all the active cellular devices and display their specific location in the room.

Project Goals

• The required location (in theory) is in (X,Y,Z) coordinates.

• In practice , we will find only one coordinate – the objet will be on a given line, in a given height.

• After success in the simulation we will extend to a full (X,Y,Z) search.

Equipment

• The phase array antenna’s and the transmitting antenna that simulates the cellular phone are both from the past projects.

• The DSP or other hardware or software that required to location will be produced in the project.

Antenna A Antenna B4.6m

2m

The room description

Inputs – general specifications

• Room size : 4.6mX2m.• 2 Multi-beam antenna at each side of the

room for full coverage.• The antennas and the cell-phone are placed

on shelf in the room • The antenna-shelf are 2m high.• The cell-phone-shelf is 1.73m high.

Inputs – general specifications (Continue)

• More than one active cellular phone in the room at the same time.

• All the cellular companies in Israel: Partner, Pelephone, Cellcom.

Inputs – general specifications (Continue…)

Transmission Frequency Company

902.2-910 MHz 947-955.2 MHz 910.2-912.2 MHz 955.2-957.2 MHz

Partner

835-845 MHz 880-890 MHz1710-1712 MHz 1805-1807 MHz

Cellcom

825-835 MHz 870-880 MHz845-847 MHz 890-892 MHz

Pelephone

System description

Cellphone

Antenna A

detectorAmp

Computing &

DisplayUnit

Amp

Amp

Amp

detector

detector

detector

Antenna B

ADC

Power consideration

Cellphone

Antenna A

Amp

Amp

0.1 Watt

2.52µWatt

Gain?= 2.52

µWatt

Power consideration (continue)

• We use the equation :

• Pt = 0.1 Watt, Gt = 0dB = 1• R = 2.41m• Δ= (wave length) = 0.17m• Gr = 9dB =7.94

Theory of detection

1. An RF signal is been received in the antennas2. After it’s been amplified , the signal goes

through the power detector – that outputs the max. power of the signal.

3. It been converted to a binary word.4. The computing unit calculates the angle

out of the power result.5. With 2 angles – we can locate the cell-phone.

Progress so far

• System OverviewSpecificationsUnderstanding of Basic IdeaLearning how to work with oscilloscope and pulse-generator

• Characterization Amplifier

Time Schedule

10.12.08 -1 week Characterization of detectors

17.12.08 - 1 week Characterization of detectors – continue

learning Basic multi-beams antennas 24.12.08 -1 weeks

Characterization of antennasMidterm presentation – 29-30.12.08