Counter-countermeasure guidance system
AssigneeThe United States of America as represented by the Secretary of the Navy
InventorFrank P. Miley
Life of this patent
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Abstract
4. A method of avoiding countermeasure jamming techniques comprising the ps of: Transmitting a signal over at least a pair of carrier waves which differ in frequency by a predetermined amount and Receiving and beating the carrier waves one against the other to obtain an intermediate frequency wave having an envelope of said signal, Whereby jamming either carrier wave will enhance the effect of said beating to increase the amplitude of the signal, thus defeating the purpose of said jamming.
Claims6
A system for avoiding countermeasure jamming techniques comprising:
- means for transmitting a signal over at least a pair of carrier waves which differ in frequency by a predetermined amount and
- means for receiving both carrier waves from the transmitting means and beating the carrier waves against one another to obtain an intermediate frequency wave having an envelope of said signal so as to simulate the operation of a local oscillator and a first detector within a superhetrodyne receiver,
- whereby jamming either carrier wave will enhance the effect of said beating to increase the amplitude of the signal, thus defeating the purpose of said jamming.
A system for controlling a remote station from a command station when countermeasure jamming techniques are effected comprising:
- the command station having at least a pair of transmitters operating on carrier wave frequencies which differ from one another by a predetermined frequency;
- means for feeding a command signal to each of said transmitters so that each transmitter can transmit the command signal over it's respective carrier wave;
- the remote station having means for receiving the carrier waves;
- the receiving means having means for beating each carrier wave against the other carrier wave so as to produce an intermediate frequency signal having an envelope of the command signal which can be utilized for command purposes,
- whereby jamming either carrier wave will enhance the effect of said beating to increase the amplitude of the signal, thus defeating the purpose of said jamming.
A system for controlling a remote station from a command station when countermeasure jamming techniques are effected comprising:
- the command station having at least a pair of transmitters operating on carrier wave frequencies which differ from one another by a predetermined frequency;
- means for feeding a command signal to each of said transmitters so that each transmitter can transmit the command signal over it's respective carrier wave;
- whereby the remote station can receive both carrier waves and beat one against the other to obtain a command signal of greater strength when either carrier wave is jammed on it's particular frequency.
A method of avoiding countermeasure jamming techniques comprising the steps of:
- transmitting a signal over at least a pair of carrier waves which differ in frequency by a predetermined amount and
- receiving and beating the carrier waves one against the other to obtain an intermediate frequency wave having an envelope of said signal,
- whereby jamming either carrier wave will enhance the effect of said beating to increase the amplitude of the signal, thus defeating the purpose of said jamming.
A method of commanding a remote station comprising the steps of:
- generating at least a pair of carrier waves having a predetermined frequency differential;
- modulating each carrier wave with a command signal;
- transmitting each modulated wave to the remote station;
- beating the modulated waves one against the other at the remote station to obtain a predetermined intermediate frequency wave having the envelope of the command signal for command purposes,
- whereby jamming of one of the modulated waves will increase the amplitude during said beating to increase the output command signal, thereby defeating the purpose of said jamming.
A method of increasing the amplitude of a signal which is transmitted from a transmitter station to a receiving station comprising the steps of:
- modulating the signal at the transmitter station with at least one of a pair of carrier waves which differ in frequency by a predetermined amount;
- transmitting the modulated carrier wave and the other carrier wave to the receiving station;
- intermediate said stations transmitting a further carrier wave having the same frequency as said other carrier wave thus increasing the amplitude of said other carrier wave and
- receiving all of said waves at the receiving station and beating them one against the other to produce an intermediate frequency wave having an envelope of said signal which signal has an increased amplitude.
Dependencies are inferred from the claim text.