The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 20, 1995
Filed:
Jul. 24, 1990
Reginald J Cyr, Santa Barbara, CA (US);
The United States of America as represented by the Secretary of the Navy, Washington, DC (US);
Abstract
A method for reliably locating the position of a submerged submarine with spect to a surface ship. A multiple number of transponders are placed at known locations near the sea floor, in the area of the ship and the submarine. One transponder has a dual function both as a response transponder and as a relay transponder. The other transponders have a single function as response transponders. Elapsed times between transmission of a first acoustic transmission pulse from the ship and receptions of first acoustic response pulses coming from the transponders, are measured at the ship. Elapsed times between transmission of a second acoustic pulse from the ship, its relay through the relay transponder, a response to the relayed signal by the submarine and then responses to the submarine's response pulse by the transponders, are also measured at the ship. These elapsed times are used to determine distances between the ship and the transponders, and distances between the transponders and the submarine. The location of the ship and the location of the submarine, with respect to the transponders, are determined from the distances.