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
Distribution Statement : APPROVED FOR PUBLIC RELEASE