14569477-jammers

JAMMERS

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

• 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..

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.

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

•

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

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

CELL PHONE JAMMER

VHF JAMMER

RADIO JAMMER

GPS JAMMER

RADAR JAMMER

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

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.

OPERATION SCHEMA

SIGNAL BLOCKED

DESIGN AND IMPLIMENTATION

Power Supply

IF Section

RFSection

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

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

IF SECTION

IF SECTION

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}

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

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.

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

RF SECTION

RF SECTION

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.

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

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 .

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.

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

TYPES OF RADIO JAMMING

Intentional jamming

Unintentional jamming

INTENTIONAL JAMMING

• Obvious jamming • Subtle jamming

OBVIOUS JAMMING :- DISTORTED SIGNAL ARE

RECEIVED

SUBTLE JAMMING :- NO SIGNALS ARE RECEIVED

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

NETWORK JAMMING

Denial-of-service attack

TYPES OF denial-of-service attack

• Attacks on wired networks • Attacks on wireless networks

Methods of attack

Permanent Dos attack Distributed attack Reflected attack Unintentional attack

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

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

JAMMER OPERATION MODES

Frequency list scanning

Band searching

Wideband jamming

Time division multiplexing jamming

Operation at dedicated frequency

VHF/UHF Radio Signal Classifier

VHF/UHF JAMMERS FACILITATES RADIOSERVILLIENCE USING

TWO SEARCH RECEIVERS

SIGNAL CLASSIFIER UNIT

BLOCK DIAGRAM OF VHF/UHF JAMMER

EJAB

JAMMER AGAINST BOMB

GPS JAMMER

WORKING OF GPS

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

1 Watt GPS Jammer

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

RADAR JAMMING

RADAR JAMMING

MECHANICAL JAMMERS

CHAFFS

CORNER REFLECTORS

DECOYS

CHAFFS• PIECE OF METAL FOILS

WHICH WHEN FALLS THROUGH AIR CREATES AN ECHO ON RADAR SYSTEM

CORNER REFLECTORS

• CORNER REFLECTORS RE-RADIATES RADAR ENERGY MOSTLY BACK TOWARD ITS SOURCE

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.

ELECTRONIC JAMMERS

SPOT JAMMERS - FOCUSES ALL ITS POWER ON A

SINGLE FREQUENCY

SWEEP JAMMERS - ITS FULL POWER SHIFTS FROM

ONE FREQUENCY TO ANOTHER

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

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