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:
May. 08, 2001
Filed:
Jun. 30, 1998
Donald R. Stephens, Clearwater, FL (US);
William Mosley, Jr., Seminole, FL (US);
Raytheon Company, Lexington, MA (US);
Abstract
A noise estimator for threshold correction of a receiver includes a low pass filter to remove wideband noise from an input signal that includes a signal component and a noise component. The output of the wideband filter is applied to a square-law power detector having an output applied to an envelope detector. The output of the envelope detector is the instantaneous envelope of the input signal and is applied to a low pass filter to perform time averaging and is also applied to a differential network. The output of the low pass filter is a signal representing a time averaged statistical envelope representing the statistical mean of the instantaneous envelope of the input signal. This signal is also applied to the differential network that generates a signal representing the difference in the instantaneous envelope of the input signal and the time averaged statistical envelope signal. This difference signal is applied to a square-law power detector and then to a low pass filter for time averaging. An output of the low pass filter is a signal representing an estimate of the noise component of the input signal.