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:
Sep. 21, 1993
Filed:
Oct. 02, 1992
David M Pirie, Norwich, CT (US);
The United States of America as represented by the Secretary of the Navy, Washington, DC (US);
Abstract
A digital range measuring system utilizes a digital signal processing prosor in connection with a precision time standard to generate a unique, characterizing frequency signal for transmission through a medium such as a body of water, at precisely known time intervals wherein a received signal at a second, different DRMS performs a predetermined number of frequency domain analyzations on the received signal to detect the presence of a known, unique frequency signal representative of at least one originating DRMS. Each of the frequency domain analyzations are time identified so that the one frequency domain analyzation during which the presence of the known frequency is detected is used to determine the time of detection. A personal computer is coupled to the digital signal processing processor and uses the time of detection in calculating the range between the receiver and the originating transmission.