Encoded Echo-Ranging Signal Generator.
DEPARTMENT OF THE NAVY WASHINGTON D C
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An object of the patent is to provide a method and means for generating a unique encoded signal that may be simultaneously used as a secure communication signal and target-ranging signal without one adversely interfering with the other. Another object is to provide a method and means for broadcasting a communication-echo-ranging sonar signal that has a random noise appearance to a casual observer or an eavesdropper not having the knowledge or the key to the encoding thereof. A further objective is to provide an improved technique for generating a controlled pseudorandom noise signal.
- Acoustic Detection and Detectors
- Acoustic Countermeasures
- Non-Radio Communications