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JAMMERS
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THE PRESENT SCENARIO
• THE ADVANCED COMMUNICATION SYSTEM IS VASTLY USED NOWADAYS
• UNFORTUNATELY THE COMMUNICATION SYSTEM IS ALSO USED AGAINST THE SOCIETY AND HUMANITY EVEN FOR PERSONAL GAINS
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• CELL PHONES, GPS SYSTEM AND RADIO COMMUNICATION ARE NOW WIDELY USED BY TERRORIST GROUPS
• CELL PHONES CREATES NUISANCES IN GOVERNMENTAL INSTITUTIONS, WORKING PLACES, RELIGIOUS PLACES, HOSPITAL, PRISON, CONCERTS ETC..
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JAMMER AS A REMEDY
• JAMMING is the act of intentionally directing electromagnetic energy at a communication system to disrupt or prevent signal transmission.
• A JAMMING device transmits on the same frequencies as the target hence disrupting the communications.
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THE BASIC CONCEPT• Voltage-controlled oscillator - Generates the
radio signal that will interfere with the cell phone signal
• Tuning circuit - Controls the frequency at which the jammer broadcasts its signal by sending a particular voltage to the oscillator
• Noise generator - Produces random electronic output in a specified frequency range to jam the cell-phone network signal (part of the tuning circuit)
• RF amplification (gain stage) - Boosts the power of the radio frequency output to high enough levels to jam a signal
•
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LEGALITIES
• India: government and schools use jammers.
• United States: illegal to operate, manufacture, import, or offer for sale, with fines of up to $11,000 and imprisonment of up to one year.
• Pakistan: legal inside banks, often used also in libraries
• United Kingdom: illegal to use, but legal to own
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TYPES OF JAMMER
JAMMER IS AN ABSTRACT IDEA OF JAMMING
ANY LINK.THUS JAMMER CAN BE CATEGORIZE
IN A NUMBER OF WAYS
WE BRING FORTH A FEW IMPORTANT OF THEM
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CELL PHONE JAMMER
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VHF JAMMER
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RADIO JAMMER
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GPS JAMMER
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RADAR JAMMER
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CELL-PHONE JAMMER
• CELL-PHONE FUNCTIONS IN A WAY THAT
THE SIGNAL IS CARRIED FROM BASE STATION
TO SATELITE AND BACK DOWN TO THE REC
-EIVER VIA THE SERVICE TOWERS.
• CELL PHONE JAMMERS JAM THE DOWN LINK
SIGNALS DENYING COMMUNICATION
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WORKING
It produces the frequency at the cell frequency
It causes interference and cancel out signals.
Hopping of frequency occurs to block frequency band.
Interrupt the communication between base station and mobile.
Call and SMS is barred.
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OPERATION SCHEMA
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SIGNAL BLOCKED
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DESIGN AND IMPLIMENTATION
Power Supply
IF Section
RFSection
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POWER SUPPLY
• The Jammer is designed to take it’s power from
a source continuously.• A typical IF & RF sections of the jammer
require +5, +9, and -9 DC Voltages.
Transformer Rectifier Filter
+ Regulator +5V
+ Regulator +9V
- Regulator - 9V
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FUNCTIONS OF I F-SECTION
• The function of the IF-section of the Mobile jammer is to generate the tuning signal required by the VCO in the RF-Section
• The main parts of the IF-Section are:– Triangular Wave Generator– Noise Generator– Signal Mixer and DC offset
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IF SECTION
IF SECTION
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TRIANGULAR WAVE GENERATOR
The circuit used to generate
Triangular wave is the 555
Timer as astable multivibrator.
The output frequency is given
By following equation.
F=1.44/{(R1+R2)Cex}
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NOISE GENERATOR
• Noise will help in masking the jamming transmission,
making it look like random "noise" to an outside observer.• The noise generator used is based on the avalanche noise generated by a Zener breakdown
phenomenon.• The noise generator circuit consists of:
– A standard 6.8 volt Zener diode with a small – reverse current– Transistor buffer– National LM386 audio amplifier function as:
• Small signal amplifier• Band pass filter
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SIGNAL MIXER AND DC OFFSET CIRCUIT
The triangle wave and noise signals are mixed using Op-Amp configured as summer.
A DC voltage is added to the resulted signal to obtain the required tuning voltage using Diode-Clamper circuit.
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FUNCTIONS OF RF SECTION
• The RF-section is responsible for generating and transmitting the RF-Jamming signal. The main parts are: VCO, Power Amplifier, and the Antenna.
• All the parts used are internally matched to
a fixed load, and hence transmission lines used are designed to have identical
characteristic impedance
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RF SECTION
RF SECTION
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V C O
• The MAX2623 VCO from MAXIM IC was used to generate the required signal
• The output frequency range for the VCO is:850 – 1000 MHz for a tune voltage from 0.4 – 2.6V.
• The input tune frequency best suited the VCO was 120KHz to sweep the desired frequency range.
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RF POWER AMPLIFIER
• Two RF power amplifiers were used to achieve the required output power (i.e. 34dBm).
• The first stage power amplifier was the MAR-4SM from Mini-Circuits it has a gain of 8dB for frequency range from DC to 1000 MHz
• so the output of this stage should be 5dBm
• for the -3dBm output of the VCO
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ADVANTAGES AND APPLICATIONS
• It blocks unwanted signals.• It is used to maintain peace &
silence.• It is used to interrupt terrorist
communication.• It is used in security purpose .
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GLIMPSE OF MIS-USES
• It can be used for blocking signal illegaly.
• It can be used for tech-war.
• It can be used for self benefit.
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RADIO JAMMER
RADIO HOLDS AN IMPORTANT ROLEIN COMMUNICATION WHEN INFORM-ATION SHARING FROM REMOTE UNACCESSIBLE AREA IS SOUGHT
RADIO COMMUNICATION CAN BE DISRUPTED BY DECREASINGSIGNAL TO NOISE RATIO
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TYPES OF RADIO JAMMING
Intentional jamming
Unintentional jamming
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INTENTIONAL JAMMING
• Obvious jamming • Subtle jamming
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OBVIOUS JAMMING :- DISTORTED SIGNAL ARE
RECEIVED
SUBTLE JAMMING :- NO SIGNALS ARE RECEIVED
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UNINTENTIONAL JAMMING
• operator transmits on a busy frequency without checking that it is in use first
• equipment accidentally radiates a signal, such as a cable TV plant that accidentally emits on an aircraft emergency frequency
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NETWORK JAMMING
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Denial-of-service attack
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TYPES OF denial-of-service attack
• Attacks on wired networks • Attacks on wireless networks
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Methods of attack
Permanent Dos attack Distributed attack Reflected attack Unintentional attack
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VHF/UHF JAMMERS
• VHF/UHF COMMUNICATION TECHNOLOGY
FUNCTIONS FOR THE TRANSFERRENCE OF
SIGNALS AT A WIDE RANGE BY ALMOST A
STAND ALONE COMMUNICATION TECHNIQUE.• VHF JAMMERS FUNCTIONS TO DENY
THIS COMMUNICATION
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VHF JAMMER - ATTRIBUTES
• VHF/UHF JAMMER 1 kW• RADIO SURVEILLANCE• AND JAMMING SYSTEM• VHF/UHF bands• Frequency range 20 - 500 MHz• Output power 1 kW/500 W• Complete signal analysis
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JAMMER OPERATION MODES
Frequency list scanning
Band searching
Wideband jamming
Time division multiplexing jamming
Operation at dedicated frequency
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VHF/UHF Radio Signal Classifier
VHF/UHF JAMMERS FACILITATES RADIOSERVILLIENCE USING
TWO SEARCH RECEIVERS
SIGNAL CLASSIFIER UNIT
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BLOCK DIAGRAM OF VHF/UHF JAMMER
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EJAB
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JAMMER AGAINST BOMB
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GPS JAMMER
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WORKING OF GPS
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SATELLITES PROVIDERF SIGNAL
USER EQUIPMENT COMPUTESPOSITION, VELOCITY AND TIME
UP
LINK
/DO
WN
LINK
CONTROL SEGMENT PROVIDES SATELLITE EPHEMERIS, CLOCK SYNCH AND COMMUNICATION INTERFACES
26 SATELLITES ON ORBIT
NAVSTAR Global Positioning System
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1 Watt GPS Jammer
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NKC-135 at 10,000 ft. Target at Ground Level Power: 400W
Location: Fort Bragg, N.C.
•Green Civil Receivers Affected•Yellow Civil Receivers Denied•Red Military Receivers
Affected•Purple Military Receivers
Denied
JTFX 98-1 Affected Target Areas
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RADAR JAMMING
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RADAR JAMMING
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MECHANICAL JAMMERS
CHAFFS
CORNER REFLECTORS
DECOYS
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CHAFFS• PIECE OF METAL FOILS
WHICH WHEN FALLS THROUGH AIR CREATES AN ECHO ON RADAR SYSTEM
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CORNER REFLECTORS
• CORNER REFLECTORS RE-RADIATES RADAR ENERGY MOSTLY BACK TOWARD ITS SOURCE
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DECOYS
• MANEUVERABLE FLYING OBJECT INTENDED TO DECEIVE A RADAR SYSTEM TO BELIEVE THAT THEY ARE ACTUALLY AIRCRAFT
• THEY CAN DANGEROUSLY CLUTTER UP RADAR WITH FALSE TARGET MAKING IT EASIER FOR THE ATTACKER GET CLOSE TO THE RADAR SYSTEM AND NEUTRALISE IT.
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ELECTRONIC JAMMERS
SPOT JAMMERS - FOCUSES ALL ITS POWER ON A
SINGLE FREQUENCY
SWEEP JAMMERS - ITS FULL POWER SHIFTS FROM
ONE FREQUENCY TO ANOTHER
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BARRAGE JAMMERS - JAMMING OF MULTIPLE
FREQUENCY AT ONCE BY A SINGLE JAMMER
BASE JAMMERS - A TYPE OF BARRAGE JAMMING
IN WHICH ONE RADAR IS JAMMED ON ALL ITS FREQUENCIES WHILE OTHER WORKS
D R F M - MANIPULATES RECEIVED RADAR ENERGY AND RETRANSMITS IT TO CHANGE THE RETURN THE RADAR SEES
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CREDITSCREDITS
• RAJKUMAR NANDY RAJKUMAR NANDY IT/06/15IT/06/15
• SANJIV KUMAR SANJIV KUMAR IT/06/14IT/06/14
• SUJIT KUMAR THAKURSUJIT KUMAR THAKUR IT/06/04IT/06/04
• MAHENDRA KUMAR YADAV MAHENDRA KUMAR YADAV IT/06/09IT/06/09
• SUKALYAN KONER SUKALYAN KONER IT/06/11IT/06/11
• RAHUL KUMARRAHUL KUMAR IT/06/03IT/06/03