e-issn 2277-2685, p-issn 2320-976 IJESR/June 2014/ Vol-4/Issue-6/492-496 K. Navaneetha et. al./ International Journal of Engineering & Science Research MOBILE PHONE SIGNAL JAMMER FOR GSM, CDMA WITH PRE-SCHEDULED TIME DURATION USING ARM7 TDMI LPC2148 ABSTRACT K.Navaneetha* 1, Prof. Prakash J Patil 2 1 M.Tech Student, Vijay Rural Engineering Colege, Nizamabad, Telangana, India. 2 Prof, Vijay Rural Engineering Colege, Nizamabad, Telangana, India. This Paper is designed and implemented for Mobile phone signal jammer for GSM, using Mobile jammer and ARM7. The jamming device broadcasts an RF signal in the frequency range reserved for cell phones that interferes with the cell phone signal, which results in a "no network available" display on the cell phone screen. Mobile jammer is a device which disturbs the communication between the mobile base station and mobile equipment by transmitting the noise signal at the frequency, on which both are trying to communicate with each other. Mobile jammer devices are becoming civilian products rather than electronic warfare devices. With increasing number of mobile users, the need to disable mobile phone in specific places, where the ringing of mobile phone would be disruptive, has increased. All phones within the effective radius of the jammer are silenced. In this project we have a jammer section, keys, microcontroller and GSM unit. We use keys to set the time for the mobile jammer to disturb or block the communication. This information is given to the microcontroller. Then controller will send data to the GSM just before the selected time and GSM will send message to the users whose numbers are programmed in the GSM that the jammer is going to activate and communication will be stopped. After message sent by GSM, mobile jammer circuit will activate and signals are jammed or blocked. Keywords: GSM sim 900, mobile jammer circuit. 1. INTRODUCTION A mobile phone jammer is an instrument used to prevent cellular phones from receiving signals from base stations. When used, the jammer effectively disables cellular phones. These devices can be used in practically any location, but are found primarily in places where a phone call would be particularly disruptive because silence is expected. As with other radio jamming, cell phone jammers block cell phone use by sending out radio waves along the same frequencies that cellular phones use. This causes enough interference with the communication between cell phones and towers to render the phones unusable. On most retail phones, the network would simply appear out of range. Most cell phones use different bands to send and receive communications from towers (called frequency division duplexing, FDD). Jammers can work by either disrupting phone to tower frequencies or tower to phone frequencies. Smaller handheld models block all bands from 800 MHz to 1900 MHz within a 30-foot range (9 meters). Small devices tend to use the former method, while larger more expensive models may interfere directly with the tower [2, 3]. Communication jamming devices were first developed and used by military. This interest comes from the fundamental objective of denying the successful transport of information from the sender (tactical commanders) to the receiver (the army personnel), and vice-versa. Nowadays, mobile (or cell) phones are becoming essential tools in our daily life. Here in Jordan, for example, with a rather low population (around 5 million), three main cell phone carriers are available; namely; Zain, Orange, and Umniah The first two use the GSM 900 system, while the third uses the GSM 1800 system. Needless to say, the wide use of mobile phones could create some problems as the sound of ringing becomes annoying or disrupting. 2. THE HARDWARE SYSTEM Micro controller: This section forms the control unit of the whole project. This section basically consists of a Microcontroller with its associated circuitry like Crystal with capacitors, Reset circuitry, Pull up resistors (if needed) and so on. The Microcontroller forms the heart of the project because it controls the devices being interfaced and communicates with the devices according to the program being written. *Corresponding Author www.ijesr.org 492
ARM7TDMI: ARM is the abbreviation of Advanced RISC Machines, it is the name of a class of processors, and is the name of a kind technology too. The RISC instruction set, and related decode mechanism are much simpler than those of Complex Instruction Set Computer (CISC) designs. Liquid-crystal display (LCD) is a flat panel display, electronic visual display that uses the light modulation properties of liquid crystals. Liquid crystals do not emit light directly. LCDs are available to display arbitrary images or fixed images which can be displayed or hidden, such as preset words, digits, and 7-segment displays as in a digital clock. They use the same basic technology, except that arbitrary images are made up of a large number of small pixels, while other displays have larger elements. Keys Section: With the help of these keys the users can enroll their eye images and will enter their passwords. GSM Modem: GSM/GPRS RS232 Modem from rhydo LABZ is built with sim com Make SIM900 Quad-band GSM/GPRS engine, works on frequencies 850 MHz, 900 MHz, 1800 MHz and 1900 MHz It is very compact in size and easy to use as plug in GSM Modem. Mobile jammer: A mobile phone jammer is an instrument used to prevent cellular phones from receiving signals from base stations. When used, the jammer effectively disables cellular phones. 3. DESIGN OF PROPOSED HARDWARE SYSTEM Now a day, every system is automated in order to face new challenges in the present day situation. Automated systems have less manual operations, so that the flexibility, reliabilities are high and accurate. Hence every field prefers automated control systems. Especially in the field of electronics automated systems are doing better performance increasingly. We have seen a dramatically boom in the number of users of mobile communication devices in the last two decade. Mobile jammer is a device which disturbs the communication between the mobile base station and mobile equipment by transmitting the noise signal at the frequency, on which both are trying to communicate with each other. Mobile jammer devices are becoming civilian products rather than electronic warfare devices. With increasing number of mobile users, the need to disable mobile phone in specific places, where the ringing of mobile phone would be disruptive, has increased. These places includes worship room, lectures rooms, hospitals, concert halls, meeting rooms, jails and other places where the silence is appreciated. Fig 1: Block diagram of Proposed system In this project we have a jammer section, keys, microcontroller and GSM unit. We use keys to set the time for the mobile jammer to disturb or block the communication. This information is given to the microcontroller. This controller will send data to the GSM just before the selected time and GSM will send message to the users whose numbers are programmed in the GSM that the jammer is going to activate and communication is stopped. After the message is sent by GSM mobile jammer circuit will activate and signals are jammed or blocked [6]. Copyright 2013 Published by IJESR. All rights reserved 493
4. BOARD HARDWARE RESOURCES FEATURES Mobile Jammer Mobile phone jammers are radio communications transmitters designed to interfere with licensed services operated by mobile carriers. A mobile phone works by communicating with its service network via a base station. A mobile phone jammer typically works by preventing the mobile phone from receiving signals from base stations. As a result, the mobile phone does not attempt to transmit to a base station, even though it may be within range. Jammers effectively disable mobile phones. Jamming a mobile phone may potentially cause it to lock up and continue in a non-receiving state outside of the jammed area until the mobile phone is turned off and on again (this may not be apparent to or understood by the user of the mobile phone). Mobile phones are commonly designed to operate across several bands. In most circumstances, a jammer would also need to operate across the same bands to effectively jam mobile phones within range. The geographical range of a mobile phone jammer depends on its power level, its operating frequencies, the physical situation of the jammer, the mobile phone/s it is attempting to block, and the local environment. Mobile phone jammers vary in quality and functionality, ranging from the rudimentary to the sophisticated. The Mobile Phone Jammer Prohibition describes a prohibited device as: a device designed to operate within the frequency bands 870-960 MHz or 825-845 MHz and to interfere with radio communications or disrupt or disturb radio communications, except where: the device is designed to facilitate a cellular mobile telephone service on board an aircraft that operates on another frequency; and the device is operated for that purpose. This description reflects a recent amendment to exempt the use of devices designed to facilitate mobile communication services on aircraft. Such devices were previously captured by the definition. In this discussion paper, the term mobile phone jammer is used to refer to any prohibited device, as defined in the Mobile Phone Jammer Prohibition [2]. 1) Jamming Techniques There are several ways to jam an RF device. The three most common techniques can be categorized as follows: Spoofing In this kind of jamming, the device forces the mobile to turn off itself. This type is very difficult to be implemented since the jamming device first detects any mobile phone in a specific area, then the device sends the signal to disable the mobile phone. Some types of this technique can detect if a nearby mobile phone is there and sends a message to tell the user to switch the phone to the silent mode (Intelligent Beacon Disablers). Shielding attacks This is known as TEMPEST or EMF shielding. This kind requires closing an area in a faraday cage so that any device inside this cage can t transmit or receive RF signal from outside of the cage. Denial of service This technique is referred to DOS. In this technique, the device transmits a noise signal at the same operating frequency of the mobile phone in order to decrease the signal-to-noise ratio (SNR) of the mobile under its minimum value. This kind of jamming technique is the simplest one since the device is always on [5]. Our device is of this type. Mobile jammer circuit includes IF section, RF section, Antenna and Power supply. GSM SIM 900 GSM/GPRS RS232 Modem from rhydolabz is built with SIMCOM Make SIM900 Quad-band GSM/GPRS engine, works on frequencies 850 MHz, 900 MHz, 1800 MHz and 1900 MHz. It is very compact in size and easy to use as plug in GSM Modem. The Modem is designed with RS232 Level converter circuitry, which allows you to directly interface PC Serial port.the baud rate can be configurable from 9600-115200 through AT command. Initially Modem is in Autobaud mode. This GSM/GPRS RS232 Modem is having internal TCP/IP stack to enable you to connect with internet via GPRS. It is suitable for SMS as well as DATA transfer application in M2M interface. The modem needed only 3 wires (Tx,Rx,GND) except Power supply to interface with Microcontroller/Host PC. The built in Low Dropout Linear voltage regulator allows you to connect wide range of unregulated power supply (4.2V -13V). Yes, 5 V is in between!!. Using this modem, you will be able to send & Read SMS, connect to internet via GPRS through simple AT commands. Copyright 2013 Published by IJESR. All rights reserved 494
GSM, used in digital cellular and PCS-based systems, operates in the 900-MHz and 1800-MHz bands in Europe and Asia and in the 1900-MHz (sometimes referred to as1.9-ghz) band in the United States. Jammers can broadcast on any frequency and are effective against AMPS, CDMA, TDMA, GSM, PCS, DCS systems [6,8]. Fig 2: Operating frequency bands In our design, the jamming frequency must be the same as the downlink, because it needs lower power to do jamming than the uplink range and there is no need to jam the base station itself. So, our frequency design will be as follows: GSM 900 ---- 935-960 MHZ GSM 1800--- 1805-1880 MHZ The CDMA frequency range will be 860-894 MHZ (Asia & Europe) and 850-894 MHZ (United States). Features High Quality Product (Not hobby grade) Quad-Band GSM/GPRS 850/ 900/ 1800/ 1900 MHz Built in RS232 Level Converter (MAX3232) Configurable baud rate SMA connector with GSM L Type Antenna. Built in SIM Card holder. Fig 3: 4x3 keypad structure A basic 12 button keypad for user input. The buttons are setup in a matrix format. This allows a microcontroller to scan the 7 output pins to see which of the 12 buttons is being pressed. The jammer ON time and OFF time will be given with the help of keypad. Copyright 2013 Published by IJESR. All rights reserved 495
5. CONCLUSION This paper is successfully completed using Mobile jammer and ARM7. By this system we can deactivate all the mobile signals at any location. We designed a device that stops phone ringing in a particular time period. This device could be used in places where ringing is not desired at specific times, as these ringing may disturb people in such places. The designed device works in dual band. It jams both the GSM 900 and GSM 1800 bands. The device was able to jam the three main cell phone carriers in Jordan. REFERENCES [1] www.howstuffwork.com [2] En.wikipedia.org/wiki/Mobile_phone_jammer [3] Multitopic conference2008.inmic 2008.IEEE International [4] Zone of silence [cell phone jammer], Spectrum, IEEE 2005; 42(5): 18. [5] Azzam S, Hijazi A, Mahmoudy A. Smart Jammer for mobile Phone systems. [6] Mobile & Personal Communications Committee of the Radio Advisory Board of Canada. Use of jammer and disabler Devices for blocking PCS, Cellular & Related Services. [7] Jisrawi A. GSM 900 Mobile Jammer, undergrad project, JUST, 2006. [8] John Scourias Overview of the global system for Mobile communications, http://ccnga.uwaterloo.ca/~jscouria/gsm/gsmreport. html#1 Copyright 2013 Published by IJESR. All rights reserved 496