telemetry using ieee802.11g for monitoring target ships author: mr. germano gonçalves capela

Telemetry Using IEEE802.11g for Monitoring Target ShipsTelemetry Using IEEE802.11g for Monitoring Target Ships

Author: Mr. Germano Gonçalves CapelaAuthor: Mr. Germano Gonçalves Capela Mr. Nuno Pessanha SantosMr. Nuno Pessanha Santos

Portuguese Naval AcademyPortuguese Naval Academy

AFCEA Award for European Excellence in a AFCEA Award for European Excellence in a Scientific Project 2009Scientific Project 2009

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•Motivation

•Objectives

•System’s Layout

•Tests and Results

•Conclusions

•Future Work

OutlineOutline

04/21/2304/21/23 European Excellence in a Scientific Project 2009European Excellence in a Scientific Project 2009 22

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MotivationMotivation

• The genesis of this project was the interest of the

Portuguese Navy (PON) in measuring physical

parameters over long distances.

• These parameters were the result of a missile impact

on a naval platform (decommissioned ship).

European Excellence in a Scientific Project 2009European Excellence in a Scientific Project 2009

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ObjectivesObjectives

• Understand and define which physical parameters

should be measured;

• Design and assemble a low cost system capable of

performing telemetry over long distances;

• Test the system in close to real conditions.


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System’s LayoutSystem’s Layout

The system can be divided into two parts:1. Wireless communication;2. Data gathering.

1.Wireless communication IEEE802.11g standard

(compatible with LAN’s, common routers with wireless,

amplifiers and antennas).

2.Data gathering Dataloggers (associated with

sensors) with LAN interface, high resolution and high

sample rate.


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A video camera was added to record some images from the impact (in the measuring station).


Accelerometer

Pressure Sensors

Temperature Sensors

Camera

Data Logger

Router Router

Wireless Bridge Link

Computer


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Based on “Off-the-shelfOff-the-shelf” equipment:

RoutersRouters: Linksys model WRT54GS V7

AmplifiersAmplifiers:: Hyperlink Technologies model DS HA2402GX-NF

AntennasAntennas:: Ferimex model OMNI H

Data loggersData loggers: Data Instrument model DI-710-EL

Digital cameraDigital camera: : Trendnet model TV-IP 100



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TestsTestsIn order to prove the measurement concept, two tests were made:

•Laboratory tests to all equipment in order to verify their own specific characteristics;

• Some tests were made to validate the system in similar conditions to real situations.


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Laboratory TestsLaboratory Tests•Routers’ output powerRouters’ output power

•Using a Spectrum Analyzer

•Amplifiers’ output powerAmplifiers’ output power•Using a Spectrum Analyzer

•Antenna’s frequency responseAntenna’s frequency response•Using a Network Analyzer

To To selectselect thethe best IEEE802.11g best IEEE802.11g channelchannel to to work withwork with

To confirm the output powerTo confirm the output power

To confirm the amplifier´s output To confirm the amplifier´s output powerpower


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Best channel was number 1111

20dBm20dBm of output power

13dB13dB of amplification


Laboratory TestsLaboratory Tests

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Five different configurations were tested to choose the best antenna arrangement.

CONFIGURATICONFIGURATIONON

ROUTER ROUTER 11

ANTENNASANTENNASROUTER ROUTER 2 2

ANTENNASANTENNAS

RightRight LeftLeft RightRight LeftLeft

1TX/RX

OFFTX/RX

OFF

2AUT

OAUT

OAUTO

AUTO

3 OFFTX/RX

OFFTX/RX

4TX/RX

OFF OFFTX/RX

5 OFFTX/RX

TX/RX

OFF



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The best antenna configuration is configuration number 5

CONFIGURATICONFIGURATIONON

ROUTER ROUTER 11 ROUTERROUTER 2 2

RightRight LeftLeft RightRight LeftLeft

5 OFF TX/RX TX/RX OFFEuropean Excellence in a Scientific Project 2009European Excellence in a Scientific Project 2009


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A series of tests were made in order to determine the required bandwidth, using the following setup:

Data: Data: 15 KB/s15 KB/sVideo: Video: 200 KB/s200 KB/s



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Sea TestsSea TestsThe test was carried out in the “Tagus estuary” using the Academy’s sea training boats in mild weather conditions


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Sea TestsSea Tests

7.50 Km

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At 7.49 km7.49 km, the signal has a level of -74 dBm -74 dBm for router 1router 1, and -75dBm -75dBm for the other.


Sea TestsSea Tests

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At 7.49 Km 7.49 Km throughput was 68 KBps 68 KBps (544 Kbps544 Kbps)


SeaSea TestsTests

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ConclusionsConclusions•This work highlights the potential of Wi-Fi technology in data transmission over long distances;

•Increasing transmission power, higher distances can easily be achieved;

•The available bandwidth at 7.49 Km allows the transmission of data but not of video.


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Test the system at high sea;

Construct a high-gain directional antenna for use on the monitoring ship;

Finally, a lot of work must still be done in analyzing the data collected by the sensors, and in optimizing the sensors and sensor layout.


Future WorkFuture Work

Questions


The End


telemetry using ieee802.11g for monitoring target ships author: mr. germano gonçalves capela

Documents

scientific project

output powerto

best ieee802

wireless communication

wireless communication

systems layoutthe system

data instrument model

g channel