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:
Nov. 06, 2001
Filed:
Oct. 16, 1998
Eric Foxlin, Arlington, MA (US);
Russell L. Moore, Hudson, MA (US);
Intersense, Inc., Burlington, MA (US);
Abstract
A system is provided for determining range to a wave energy source. The system includes a transmitter for transmitting a burst of pulses of wave energy in response to a trigger signal. A receiver is provided for determining a time of arrival of the burst and from such determined time of arrival, the range to the wave energy source. The receiver includes: an envelope detector for detecting an envelope of the burst; a network for producing an output in response to an early point on the detected envelope occurring prior to a peak in the detected envelope; a timer, responsive to the trigger signal and the network output for determining the time of arrival of the burst; and a processor, responsive to such determined time of arrival, for determining the range of the wave energy source from the transmitter. The receiver includes a differentiator network for producing an output in response to the nth derivative of the detected envelope, where n is an integer greater than one; and, the timer is responsive to the trigger signal and the differentiator output for determining the time of arrival of the burst. The receiver also includes a means for confirming detection of a valid burst after the detection of the early point and a means to transmit and wherein the previously recorded time of arrival point only if it is followed by a valid burst confirmation.