Title of Invention

'REMOTE CONTROLLED IMPROVISED EXPLOSIVE DEVICE JAMMER'

Abstract

The present invention provides a remote controlled improvised explosive device jammer comprising: a stabilized power supply unit connected to press to talk (PTT) circuit, a noise generator circuit and oscillator circuit in parallel, the noise generator generates white noise which is modulated on the frequency of the oscillator circuit, said PTT circuit is connected to "PTT Switch" to switch on the transmitter, the noise modulated output of oscillator is connected to voltage control oscillator (VCO) of said transmitter to generate 7600 channels simultaneously in the band of 136-174 MHz in 5 KHz channel spacing which is the frequency range of said transmitter to jam the planted improvised explosive device (IED).

Full Text

FIELD OF INVENTION This invention relates to Remote Controlled Improvised Explosive Device Jammer. BACKGROUND During the prevailing situation in the Kashmir Valley the militants are using explosive devices of different types. Initially, they were using physical wires to explode the RDX and other detonating devices. As the deployment of forces have been increased the physical checking for said devices could be possible which forces the militants groups to switch over to the remotely controlled devices. The militants in the Kashmir Valley are using various techniques such as> 1) Initially militant were using physical wires & battery to explode the lEDs. 2) RCIED 2 digit DTMF technique. 3) RCIED 3 digit DTMF technique. 4) RCIED 3 digit DTMF with resetting technique The said devices have been captured from militant in the valley and have been analyzed by R & D Cell of BSF. It has been observed that these devices are being operated in the frequency range 136-174 MHz only. A DTMF modulated signal is sent by the militant from remote location to planted IED receiver Unit after proper planning to destroy the target. A conventional technique used by the militant is described in Figure 1. Militants are using Hand Held Radio Set (1) of 5 watts having Dual Tone Multiple frequency (DTMF facilities). They plant the IED receiver (2) in the convoy routes or anywhere else where the movement of Armed Forces is frequent. They operate IED receiver Unit -2 from a distance as per their convenience. Said I ED receiver (2) has two channels CH-1 and CH-2 to destroy their targets. The circuit of IED receiver Unit (2) has been analyzed at R & D Cell of BSF. The block diagram of said receiver Unit -2 captured from the militant in Kashmir is shown in figure 2. It may be seen from figure 2 that the IED receiver Unit-2 consists of RFA, Mixer, Local Isolator, IFA and detector for IED receiver 2. This is similar to any super heterodyne receiver. The signal picked up by the antenna is amplified by RFA and fed to the mixer, where it is mixed with the local oscillator frequency. The output is the intermediate frequency, which is applied to the 2nd Mixer stage, 2nd IFA and detector. The signal received by the receiver Unit (2) is a DTMF modulated signal. Here at the detector stage the RF is grounded and the DTMF signals are decoded by the DTMF decoder. The output of said decoder is BCD (Binary Coded Decimal) Signal. These BCD signals are applied to decimal decoder. The two digit DTMF code for each channel CH-1 and CH-2 is pre-assigned by the militants. As per the pre-assigned DTMF code the output of BCD decoder is obtained. The first digit of CH-1 is applied to one of the input of AND Gate through a RC network which holds the first digit for pre-defined duration of time calculated with the values of RC. The second digit is applied directly to input of the AND Gate. The holding time for first digit is different in different units. As and when the militants send first digit to explode the IED it gets stored at the input of AND Gate for pre-defined duration of time. If militants sends second code within that time the two input of the AND Gate becomes high which trigger SCR and operates CH-1 of the IED receiver Unit and explode the RDX connected to it. Similarly, the CH-2 can be operated. The object of this invention is to jam the improvised explosive device with the help of a remote control. To achieve the said objective this invention provides a remote controlled improvised explosive device jammer comprising: a stabilized power supply unit connected to Press to talk (PIT) circuit, a Noise Generator Circuit and oscillator circuit in parallel. the noise generator generates white noise which is modulated on the frequency of the oscillator circuit, said PIT circuit is connected to "PTT Switch" to switch on the transmitter, the noise modulated output of oscillator is connected to voltage control oscillator (VCO) of said transmitter to generate 7600 channels simultaneously in the band of 136-174 MHz in 5 KHz channel spacing which is the frequency range of said transmitter to jam the planted improvised explosive device (IED). The white noise is in the range 300 Hz to 20 KHz. The power supply comprises of an oscillator, connected to switching circuit and regulator circuit connected in series, such that when an input voltage is applied to the oscillator and switching circuit, the voltage increases almost double of the input voltage and voltage regulator regulates it upto 12 volts. The PTT circuit comprises an opto-coupler and delay circuit to switch on the transmitter after the required delay. The noise generator and oscillator are connected in series. The oscillator produces the frequency in audio range and mixed with the high frequency noise produced by the noise generator. The combined output is connected to the voltage controlled oscillator of transmitter. The invention will now be described with reference to the accompanying drawings. Figure 1 shows the conventional device for operating IED receiver unit. Figure 2 shows the conventional block diagram of the IED receiver unit. Figure 3 shows a remote controlled improvised explosive device jammer according to this invention. Figure 4 shows the power supply, according to this invention Figures 1 and 2 have been described under the heading background. In figure 3 the power supply (3) is connected to PIT circuit (4), noise generator circuit (5), oscillator circuit (6) is connected to VCO (9) of the transmitter (7). The said transmitter (7) is connected to antenna (10). PIT circuit (4) us connected to PTT circuit (8) of the transmitter (7). The power supply (3) supplies the power to PTT circuit (4), noise generator (5), oscillator circuit (6). The noise generator generates the high frequency noise, which is super imposed on the frequency of the oscillator and the output is fed to VCO (9) of the transmitter (7). Simultaneously PTT circuit (4) switches on the transmitter switch (8). Then the transmitter (7) generates all frequencies between 136 to 174 MHz with white noise in the range 300 Hz to 20 KHz. These noises disturb the dual tone multiple frequency (DTMF) communication between the remote set (1) of militant and IED receiver (2) planted with the explosive, shown in Figure 1. Due to the noise modulated signals the IED receiver unit (2) is not able to detect the DTMF signal transmitted by the militant, thereby preventing the IED blast. We claim: 1. A remote controlled improvised explosive device jammer comprising: a stabilized power supply unit connected to Press to talk (PIT) circuit, a Noise Generator Circuit and oscillator circuit in parallel. the noise generator generates white noise which is modulated on the frequency of the oscillator circuit, said PTT circuit is connected to "PIT Switch" to switch on the transmitter, the noise modulated output of oscillator is connected to voltage control oscillator (VCO) of said transmitter to generate 7600 channels simultaneously in the band of 136-174 MHz in 5 KHz channel spacing which is the frequency range of said transmitter to jam the planted improvised explosive device (IED). 2. A remote controlled improvised explosive device jammer as claimed in claim 1 wherein white noise is in the range 300 Hz to 20 KHz. 3. A remote controlled improvised explosive device jammer as claimed in claim 1 wherein the power supply comprises of an oscillator, connected to switching circuit and regulator circuit connected in series, such that when an input voltage is applied to the oscillator and switching circuit, the voltage increases almost double of the input voltage and voltage regulator regulates it upto 12 volts. 4. A remote controlled improvised explosive device jammer as claimed in claim 1 wherein the PTT circuit comprises an opto-coupler and delay circuit to switch on the transmitter after the required delay. 5. A remote controlled improvised explosive device jammer as claimed in claim 1 wherein the noise generator and oscillator are connected in series. The oscillator produces the frequency in audio range and mixed with the high frequency noise produced by the noise generator, the combined output is connected to the voltage controlled oscillator of transmitter. 6 A remote controlled improvised explosive device jammer substantially as herein described with reference to and as illustrated in the accompanying drawings.

Documents:

960-DEL-2006-Abstract-(10-12-2008).pdf

960-del-2006-abstract.pdf

960-del-2006-claims.pdf

960-DEL-2006-Correspondence-Others-(10-12-2008).pdf

960-del-2006-correspondence-others.pdf

960-del-2006-description (complete).pdf

960-del-2006-drawings.pdf

960-del-2006-form-1.pdf

960-del-2006-form-18.pdf

960-del-2006-form-2.pdf

960-del-2006-form-3.pdf

960-del-2006-form-9.pdf

960-del-2006-gpa.pdf