Radio jamming system

• US 4,103,237 A
• Filed: 12/15/1955
• Issued: 07/25/1978
• Est. Priority Date: 12/15/1955
• Status: Expired due to Term

• Current Assignee: ITT Corporation (ITT, Inc.)
• Original Assignee: International Telephone & Telegraph Corp. (ITT, Inc.)
• Inventors: Fischer, Laurin G.
• Primary Examiner(s): Birmiel, Howard A.
• Application Number:
  US03/553,352
• Time in Patent Office: 8,258 Days
• Field of Search: 250/17, 250/15, 250/15 T, 343/18, 343/18 E, 325/132, 325/1, 325/6
• US Class Current: 455/1
• CPC Class Codes: H04K 2203/32 including a particular configuration of antennas
• CPC Class Codes: H04K 3/28 with jamming and anti-jamming mechanisms both included in a same device or system, e.g. wherein anti-jamming includes prevention of undesired self-jamming resulting from jamming
• CPC Class Codes: H04K 3/45 characterized by including monitoring of the target or target signal, e.g. in reactive jammers or follower jammers for example by means of an alternation of jamming phases and monitoring phases, called "look-through mode"
• CPC Class Codes: H04K 3/46 characterized in that the jamming signal is produced by retransmitting a received signal, after delay or processing

Abstract

1. A repeater comprising an antenna system, a repeater loop consisting solely of broadband elements for coupling the input signal from the input to the output thereof without changing the frequency of the signal at any place in the loop, said elements including at least one broadband translation device, means coupling the input and output of said repeater loop to said antenna system to receive incoming signals and for retransmitting said signals, and means for communicating through said repeater including a source of local intelligence signals, a source of a local carrier wave, means coupling said wave source to said loop at a point ahead of said translation device and means coupling the source of local intelligence signals to said translation device to modulate said local carrier wave.

Claims

1. A repeater comprising an antenna system, a repeater loop consisting solely of broadband elements for coupling the input signal from the input to the output thereof without changing the frequency of the signal at any place in the loop, said elements including at least one broadband translation device, means coupling the input and output of said repeater loop to said antenna system to receive incoming signals and for retransmitting said signals, and means for communicating through said repeater including a source of local intelligence signals, a source of a local carrier wave, means coupling said wave source to said loop at a point ahead of said translation device and means coupling the source of local intelligence signals to said translation device to modulate said local carrier wave.

2. A repeater according to claim 1 further including means for blocking said loop at a point ahead of the point at which said carrier wave is injected during the injection of said carrier wave.

3. A jamming system according to claim 2, wherein said means for communicating includes a receiver coupled to said repeater system and tunable to receive signals over a channel within the broadband of said repeater system.

4. A jamming system for jamming signals consisting of a carrier modulated according to intelligence comprising an antenna system, a repeater loop, means coupling the input and output of said repeater loop to said antenna system to receive the signals to be jammed and for retransmitting said signals, a storage delay device in series in said repeater loop, means, including a monostable trigger device whose input is coupled to the output of said delay device normally blocking said repeater loop at a first point after said delay device and unblocking said repeater loop at a second point before said delay device, said means being responsive to the initial portion of a signal passing through said delay device to reverse for a given fixed time interval said blocking and unblocking of said first and second points, whereby a portion of the incoming signal is isolated in said delay device from the remainder thereof, means in said repeater loop after said delay device for reiterating said isolated portion of said signal a plurality of times during a second time interval, and means for applying said plurality of reiterations of said isolated portion to said antenna coupling means for transmission during said second interval.

5. A jamming system according to claim 4 in which said reiterating means comprises a signal translator in series in said repeater loop, and a recirculating line including a delay means in series therein coupled between the output and input of said translator and having a delay at least equal to that of said storage delay device.

6. A jamming system according to claim 4 further including means in said repeater loop for distorting the intelligence-bearing modulation of the incoming signal comprising means for detecting the intelligence-bearing modulation of the incoming signal, means for distorting the detected modulation, and means for applying the distorted detected modulation to said repeater loop at a point after said delay device to remodulate the signals passing through said repeater loop.

7. A jamming system for jamming signals consisting of a carrier modulated according to intelligence comprising an antenna system, a repeater loop consisting solely of broadband elements for coupling the input signal from the input of said loop to the output thereof without changing the frequency of said signal at any place in the loop, said elements including at least one broadband amplifier means coupling the input and output of said repeater loop to said antenna system to receive the signals to be jammed and for retransmitting said signals, means in said repeater loop for distorting the intelligence-bearing modulation of the incoming signal, means coupled to said loop for isolating a portion of the input signal which is received during a given interval, and means coupled to said loop at a point after said isolating means for reiterating a number of times said isolated portion and transmitting it during a second interval which is at least said number of times greater than said first interval.