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. 07, 2002
Filed:
Jan. 05, 2001
Linley F. Gumm, Beaverton, OR (US);
Tektronix, Inc, Beaverton, OR (US);
Abstract
A direction finder using spread spectrum techniques has an array of antennas in a predetermined configuration for receiving a signal from a modulated, or interfering, signal source. The individual outputs from each antenna are input to respective direct sequence spread spectrum modulators where each is multiplied by a unique pseudo-random number (PRN) code, unique either in value or in time relationship. The spread spectrum outputs are summed and the summed output is demodulated and digitized to produce a digitized intermediate frequency (IF) signal. The digitized IF signal is processed by a digital signal processing (DSP) engine to determine relative phase or time of arrival of the signal from the modulated signal source at each antenna relative to one of the antennas used as a reference. The relative phases or times of arrival and the predetermined configuration of the antenna array are then used to estimate the direction to the modulated signal source with a high degree of accuracy.