Simultaneous communications jamming and enabling on a same frequency band
First Claim
Patent Images
1. A method for enabling friendly communication signals to be received while jamming hostile communication signals, the method comprising:
- receiving a communication signal having a known component and an unknown component at a Digital Radio Frequency Memory (DRFM) module and storing a coherent copy in digital memory;
altering the communication signal in a predetermined manner;
retransmitting an altered communication signal;
receiving the communication signal and the altered communication signal at a friendly receiver;
searching for the known component in the communication signal and in the altered communication signal, the friendly receiver having knowledge of the predetermined manner in which the communication signal is altered; and
isolating a non-artificial multi-path channel for the communication signal and receiving the unknown component at the receiver.
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Abstract
There is described the use of Digital Radio Frequency Memory (DRFM) modules to jam certain communication signals while allowing others to be received on a given frequency band. The DRFM modules exploit the multi-path phenomenon by using transmitted signals to cause full band destructive echoes and/or distortions. A set of receivers used in conjunction with the DRFM modules are aware of the exact multi-path induced by the DRFM modules and are therefore able to mitigate or even benefit from the effects of the destructive multi-path and maintain or improve communications.
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Citations
29 Claims
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1. A method for enabling friendly communication signals to be received while jamming hostile communication signals, the method comprising:
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receiving a communication signal having a known component and an unknown component at a Digital Radio Frequency Memory (DRFM) module and storing a coherent copy in digital memory; altering the communication signal in a predetermined manner; retransmitting an altered communication signal; receiving the communication signal and the altered communication signal at a friendly receiver; searching for the known component in the communication signal and in the altered communication signal, the friendly receiver having knowledge of the predetermined manner in which the communication signal is altered; and isolating a non-artificial multi-path channel for the communication signal and receiving the unknown component at the receiver. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A system for enabling friendly communication signals to be received while jamming hostile communication signals, the system comprising:
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at least one Digital Radio Frequency Memory (DRFM) module adapted to receiving a communication signal having a known component and an unknown component, store a coherent copy in digital memory, alter the communication signal in a predetermined manner, and retransmit the altered communication signal; and at least one friendly receiver having knowledge of the predetermined manner in which the communication signal is altered and adapted to receive the communication signal and the altered communication signal, search for the known component in the communication signal and in the altered communication signal, isolate a non-artificial multi-path channel for the communication signal, and receive the unknown component at the receiver. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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- 27. A Digital Radio Frequency Memory (DRFM) module for enabling friendly communication signals to be received at friendly receivers while jamming hostile communication signals at hostile receivers, the DRFM module comprising a radio receiver adapted to receive a communication signal having a known component and an unknown component, a digital memory adapted to store a coherent copy, a controller adapted to cause an alteration of the communication signal in a predetermined manner known only to the friendly receivers, and a transmitter adapted to retransmit the altered communication signal.
Specification