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:

1976-05-18

Pagination or Media Count:

14.0

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