designing and implementation of an embedded system for real time field data acquisition using...

Designing and Implementation of an Embedded System for Real time Field Data Acquisition using Wireless

technology

OUTLINE

• Introduction• Project Objective• Technologies Involved• Proposed Methodology• Advantages • Conclusion • Future Enhancements• References

April 13, 2023 2

ORGANIZATIONAL PROFILE

Maharashtra Remote Sensing Applications Centre (MRSAC) was established in September 1988 at Nagpur under the administrative control of dept. of planning, Govt. of Maharashtra and ISRO-NNRMS, Department of Space, Govt. of India.

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INTRODUCTION

• Remote sensing & need of manual field data

collection

• Traditional methods of survey

• Use of GPS receivers

• Wireless communication

• GIS

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PROJECT OBJECTIVE

The project proposes design and

implementation of an absolute embedded system

solely dedicated for the real time collection of data

from remote areas using a GPS enabled mobile device

and building a complete system intended for

transmission as well as reception of data using SMS

(Short Messaging Services) and finally interfacing the

system with GIS. April 13, 2023 5Pallavi Choudhary (DTI)

TECHNOLOGIES INVOLVED

• Global Positioning System Technology

• GSM Network Technology

• Wireless SMS Technology

• GIS

April 13, 2023 6Pallavi Choudhary (DTI)

THE GLOBAL POSITIONING SYSTEM

• A satellite based navigation system consisting of a

constellation of 24 active satellites arranged in 6 different

planes with 4 slots each.

• Placed at a distance of 20200 kms form Earth surface i.e.

(MEO) and 55o inclination.

• Orbit at a speed of 3.9km/sec.


GPS TRACKINGGPS SIGNALS are L band signals (1000-2000Mhz), divided into 2

categories:

• L1 frequency (1575.42 MHz): for civil signals

• L2 frequency (1227.60 MHz) : for military signals

GPS signal contains three different bits of information –

• Pseudorandom code ( for positioning)

• Ephemeris data (precise orbital information)

• Almanac data (the general system health)


THE GLOBAL SYSTEM FOR MOBILE(GSM)

• A standard developed by ETSI to

describe technologies for 2G

digital cellular networks.

• Operate at frequencies of 900

MHz or 1800 MHz .

• Data transmission rate is 270.833

kbps.

• Frame duration is 4.615 ms.

• Transmission power is 2 watts

(maximum).


SMS ARCHITECTURE

The figure above shows the diagrammatic representation of two way

SMS communication over the existing network.


DATA FORMAT OF SMS

• SMS holds 140 bytes of data (i.e. 160 characters)

• This is encoded in PDU (Protocol Data Unit) format. Following is the

structure of PDU:

SCA: Service Centre Address PID: Protocol Identifier TOA: Type of address DCS: Data Coding Scheme SCN: Service Center Number SCTS: Service Center Time

Stamp SD-PDU: 1st octet of SMS DELIVER VP: Validity Period AL: Address Length UDL: User Data Length DA: Destination Address UD-PDU: User data PDU

SCA TOA SCN SD-PDU AL DA PID DCS SCTS VP UDL UD-PDU


PROPOSED METHODOLOGY

• Design of Transmitting Equipment

• Design of Receiver Subsystem


SYSTEM BLOCK DIAGRAM

Gather GPS coordinates of

the location

Key in other desired

information

Encode & package in the form of SMS

Transmitting Mobile Handset in Remote Area

Receiving Subsystem

Data Receiving Apparatus

(GSM Modem)

Local server

GIS serverDatabase

GSM Network


DESIGN OF TRANSMITTING EQUIPMENT

This is a 3 tier architecture:

• Converting a mobile handset into exclusive GPS receiver.

• A field information system to enter the desired parameters

manually.

• An application dedicated for packaging all the information, in

the form of an SMS, encode it and transmit it to a predefined

destination.


PLATFORM OF ANDROID

April 13, 2023 Pallavi Choudhary (DTI) 15

• A product under Open Handset Alliance (OHA) powered by

Google.

• Is Linux based system, hence a freeware and thus perfect for

development purposes.

• Minimum requirement of memory is quite less (approx 250

Kbytes) as compared to others.

• Manufacturer independent.

DESIGN OF RECEIVER SUBSYSTEM

• Use of wireless GSM modems.

• Convert it into dedicated SMS receiver.

• Decode the data received .

• Defragment the data and store it into a database server.

• Interface the database with local server as well as GIS server

for further exploitation.


ADVANTAGES

• This system is designed to overcome the disadvantages of

traditional GPS receiver used in surveying.

• Increase in accuracy as well as security of data.

• Surveying and data collection can be completed in real time.

• Cost effective as compared to older techniques.

• Easy monitoring of survey.

• Work force applied and time invested in a survey gets

reduced to a great extent.


CONCLUSION

• The proposed system is capable of collecting the field data

along with positional information in real time.

• It is also capable of forming a record of data automatically at

the remote server.

• Moreover it also has ability of generating maps from data

stored in the database.


FUTURE ENHANCEMENTS

• The same system can be developed for other platforms also,

for the purpose of generalization.

• The system can be extended for two way communication.

• Still Image transmission can be appended along with the

existing system.

• The SMS body can contain image data in form of text thus

terminating the usage of MMS for data transmission in

wireless technology.


Thank You…


REFERENCES• GSM MOBILE PHONE BASED ACTIVITY DIARY SURVEY, Ohmori, Harata,

Nakazato, Proceedings of Eastern Asia Society of Transportation studies, vol. 5, pp 1104-1115, 2005.

• GPS MORDERNIZATION: CAPABLITIES OF NEW CIVIL SIGNALS, Australian International Aerospace Congress, August, 2003.

• DEVELOPING SECURE MOBILE APPLICATONS FOR ANDROID, White Paper, Jesse Burns, 2008.

• ANDROID MOBILE PLATFORM, Thesis, Benjamin Speckmann, Eastern Michigan University, 2008.

• COMPONENTS OF SMS BASED DATA COLLECTION AND SERVICE DELIVERY, Mathew Berg, Vijay Modi, Modi Research Group-Columbia University.

• http://www.developershome.com/sms/• SMS TRANSMISSION USING PDU MODE AND 7 BIT CODING SCHEME,

Andris Ortiz, Alberto Prieto.


designing and implementation of an embedded system for real time field data acquisition using...

Engineering

pallavi choudhary dti

data collection

reception of data

record of data

bytes of data

security of data

data format of sms sms

proposed system