Accession Number : ADD002901

Title :   Encoded Echo-Ranging Signal Generator.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON D C

Personal Author(s) : Andrews,Daniel E , Jr ; Klund,William E ; Isaak,Robert D

Report Date : 18 May 1976

Pagination or Media Count : 14

Abstract : 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.

Descriptors :   *Coding, *Acoustic countermeasures, *Patents, Secure communications, Sonar signals, Echo ranging, Signal generators, Pseudo noise systems, Pseudo random systems

Subject Categories : Acoustic Detection and Detectors
      Acoustic Countermeasures
      Non-radio Communications

Distribution Statement : APPROVED FOR PUBLIC RELEASE