KID NET PROJECT: SIGNAL STRENGTH BASED ORIENTATION DISCOVERY

Group Members

Saleel Kudchadker

Sushma Myneni

AGENDA

Project Goals Introduction to Project Project Details Problems Faced Results Goals Not Achieved

PROJECT GOALS

Providing a facing direction measurement system of a sensor with another

Use metrics such as Signal Strength, Packet error rate to estimate orientation

Generate MATLAB model to estimate orientation

PROJECT DETAILS AND ASSUMPTIONS

Assumptions Kids are in close proximity with in 1.5 ft Antenna of the motes are not covered

Project Details Readings were taken at multiples of 90º angles Telos B mote is mounted vertically

PROJECT DETAILS

We have used Telos B motes in our experiments

We have used the internal antenna (F-inverted) present on the PCB

Radiation pattern of the F-inverted (vertical mounting) is not perfectly Omnidirectional

EVALUATION SETUP

Sensor 0

Sensor 2

Sensor 1

Sensor 4

Sensor 3

0º90º180º270º

0º90º180º270º

0º90º180º270º

0º90º180º270º

0º90º180º270º

EVALUATION SETUP

Sensor 0

Sensor 2

Sensor 1

Sensor 4

Sensor 3

0º90º180º270º

0º90º180º270º

0º90º180º270º

0º90º180º270º

0º90º180º270º

EVALUATION SETUP

Sensor 0

Sensor 2

Sensor 1

Sensor 4

Sensor 3

0º90º180º270º

0º90º180º270º

0º90º180º270º

0º90º180º270º

0º90º180º270º

EVALUATION SETUP

Sensor 0

Sensor 2

Sensor 1

Sensor 4

Sensor 3

0º90º180º270º

0º90º180º270º

0º90º180º270º

0º90º180º270º

0º90º180º270º

PROBLEMS FACED

Omni-directional antenna of telos B needs analysis of radiation pattern

Multipath problems resulted in erroneous results

Packet error rate is very high even at shorter range like 1feet

RESULTS

Matlab model takes the radiation pattern and RSSI values to calculate angle of orientation which agrees with experimental setup

GOALS NOT ACHIEVED

Unable to include packet error rate metric Experiment was not conducted by varying

the height Experiment was conducted only indoors

Questions?