Anti-jamming communication system

• US 4,179,657 A
• Filed: 08/28/1958
• Issued: 12/18/1979
• Est. Priority Date: 08/28/1958
• Status: Expired due to Term

• Current Assignee: United States Of America As Represented By The Secretary Of The Air Force
• Original Assignee: United States Of America As Represented By The Secretary Of The Air Force
• Inventors: Hobbs, Charles F.
• Primary Examiner(s): Buczinski, S. C.
• Application Number:
  US03/757,885
• Time in Patent Office: 7,782 Days
• Field of Search: 179/15 AS, 325/33, 178/22, 178/5.1
• US Class Current: 380/34
• CPC Class Codes: H04K 1/00 Secret communication
• CPC Class Codes: H04K 3/25 based on characteristics of target signal or of transmission as countermeasure against surveillance H04K3/827, e.g. using direct sequence spread spectrum or fast frequency hopping spread spectrum techniques H04B1/69
• 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 3/65 using deceptive jamming or spoofing, e.g. transmission of false signals for premature triggering of RCIED, for forced connection or disconnection to/from a network or for generation of dummy target signal
• CPC Class Codes: H04K 3/68 using passive jamming, e.g. by shielding or reflection shielding of apparatus or components against electric or magnetic field H05K9/00
• CPC Class Codes: H04K 3/827 using characteristics of target signal or of transmission as countermeasure against jamming H04K3/25, e.g. using direct sequence spread spectrum or fast frequency hopping spread spectrum techniques H04B1/69

Abstract

1. A system of communications to an intended destination in a manner to elude detection by unauthorized sources, and to prevent jamming, which comprises multi-channel transmitting means, each of said channel transmitting means having a different frequency and delay, said frequency and delay being variable, means to generate time and address digits, means to encipher said time and address digits, means to initially set the frequencies and delays in each of said transmitting channels, said setting means receiving said enciphered time and address digits, means to convert a message to be transmitted into digital bits, means to encipher said message digital bits, means for multiple transmission of the initial message digital bit after said setting of channels, and means to successively reset the frequency and delay in each of said transmitting channels after said multiple transmission of said first message digital bit, said resetting means receiving successive enciphered message digital bits until said message is completely transmitted.

Claims

1. A system of communications to an intended destination in a manner to elude detection by unauthorized sources, and to prevent jamming, which comprises multi-channel transmitting means, each of said channel and transmitting means having a different frequency and delay, said frequency and delay being variable, means to generate time and address digits, means to encipher said time and address digits, means to initially set the frequencies and delays in each of said transmitting channels, said setting means receiving said enciphered time and address digits, means to convert a message to be transmitted into digital bits, means to encipher said message digital bits, means for multiple transmission of the initial message digital bit after said setting of channels, and means to successively reset the frequency and delay in each of said transmitting channels after said multiple transmission of said first message digital bit, said resetting means receiving successive enciphered message digital bits until said message is completely transmitted.

2. A system of communications to an intended destination in a manner to elude detection by unauthorized sources, and to prevent jamming, which comprises multi-channel transmitting means, each of said channel transmitting means having a different frequency and delay, said frequency and delay being variable, means to generate time and address digits, means to encipher said time and address digits, means to initially set the frequencies and delays in each of said transmitting channels, said setting means receiving said enciphered time and address digits, means to convert a message to be transmitted into digital bits, means to encipher said message digital bits, means for multiple transmission of the initial message digital bit after said initial setting of said transmitting channels, means to successively reset the frequency and time delay in each of said transmitting channels after said multiple transmission of said first message digital bit, said resetting means receiving said successive enciphered message digital bits, each of said message digital bits being transmitted in multiple upon each of said resettings until said message is completely transmitted.

3. A system of communications to an intended destination in a manner to elude detection by unauthorized sources, and to prevent jamming, which comprises multi-channel transmitting means, each of said channel transmitting means having a different frequency and delay, said frequency and delay being variable, means to generate time and address digits, means to encipher said time and address digits, means to initially set the frequencies and delays in each of said transmitting channels, said setting means receiving said enciphered time and address digits, means to convert a message to be transmitted into digital bits, means to encipher said message digital bits, means for multiple transmission of the initial message digital bit after said initial setting of said transmitting channels, means to successively reset the frequency and time delay in each of said transmitting channels after said multiple transmission of said first message digital bit, said resetting means receiving said successive enciphered message digital bits, each of said message digital bits being transmitted in multiple upon each of said resettings until said message is completely transmitted, multi-channel means to receive said multiple transmissions of digital bits, means to set and reset said receiving multi-channels in a manner corresponding to said transmitting channels, and means to synchronize in time said transmitting and said receiving means.

4. A system of communications to an intended destination in a manner to elude detection by unauthorized sources, and to prevent jamming, which comprises multi-channel transmitting means, each of said channel transmitting means having a different frequency and delay, said frequency and delay being variable, means to generate time and address digits, means to encipher said time and address digits, means to initially set the frequencies and delays in each of said transmitting channels, said setting means receiving sad enciphered time and address digits, means to convet a message to be transmitted into digital bits, means to encipher said message digital bits, means for multiple transmission of the initial message digital bit after said initial setting of said transmitting channels, means to successively reset the frequency and time delay in each of said transmitting channels after said multiple transmission of said first message digital bit, said resetting means receiving said successive enciphered message digital bits, each of said message digital bits being transmitted in multiple upon each of said resettings until said message is completely transmitted, multi-channel means to receive said multiple transmissions of digital bits, means to set and reset said receiving multi-channels in a manner corresponding to said transmitting channels, means to synchronize in time said transmitting and said receiving means, and means to re-establish communications between said transmitter and said receiver when a message is intercepted in the process of transmission, wherein said means includes a provision to initiate said uncompleted message from its very inception.

5. A system of communications to an intended destination in a manner to elude detection by unauthorized sources, and to prevent jamming, which comprises multi-channel transmitting means, each of said channel transmitting means having a different frequency and delay, said frequency and delay being variable, means to generate time and address digits, means to encipher said time and address digits, means to initially set the frequencies and delays in each of said transmitting channels, said setting means receiving said enciphered time and address digits, means to convert a message to be transmitted into digital bits, means for multiple transmission of the initial message digital bit after said initial setting of said transmitting channels, means to successively reset the frequency and delay in each of said transmitting channels after said multiple transmission of said first message digital bit, said resetting means receiving said successive said enciphered message digital bits, each of said message digital bits being transmitted in multiple upon each of said resettings until said message is completely transmitted, and multi-channel means for multiple transmission of dummy message digit bits simultaneously with said message digital bits.

6. A system of communications to an intended destination in a manner to elude detection by unauthorized sources, and to prevent jamming, which comprises multi-channel transmitting means, each of said channel transmitting means having a different frequency and delay, said frequency and delay being variable, means to generate time and address digits, means to encipher said time and address digits, means to initially set the frequencies and delays in each of said transmitting channels said setting means receiving said enciphered time and address digits, means to convert a message to be transmitted into digital bits, means to encipher said message digital bits, means for redundant transmission of the initial message digital bit after said initial setting of said transmitting channels, means to successively reset the frequency and time delay in each of said transmitting channels after said multiple transmission of said first message digital bit, said resetting means receiving said successive enciphered message digital bits, each of said message digital bits being transmitted in multiple upon each of said resettings until said message is completely transmitted, multi-channel means to receive transmissions of said message digital bits, means to set and reset said receiving channels in a manner corresponding to said transmitting channels, means to synchronize in time said transmitting and said receiving means, transmitting means located at said multi-channel receiving means to acknowledge receipt of a transmitted message, and means located at said transmitter to receive said acknowledgement transmission and thereupon initiate a message to some other intended destination.