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:
Jul. 01, 2014
Filed:
Nov. 30, 2012
Honeywell International Inc., Morristown, MN (US);
Alfonso Malaga, Sammamish, WA (US);
Jamal Haque, Clearwater, FL (US);
Andrew White, Sarasota, FL (US);
Honeywell International Inc., Morristown, NJ (US);
Abstract
One embodiment is directed towards an RF receiver for receiving a pulse-position modulated signal transmitted with a 1090 MHz ADS-B transmitter, wherein the pulse-position modulated signal is preceded by a preamble of 4 pulses that conform to an ADS-B protocol. The receiver can filter a digital sample stream with a filter matched to pulses in an earlier half of an expected preamble sequence to produce a first matched filter output sample stream. The receiver can also filter the digital sample stream with a filter matched to a pulses in a latter half of the expected preamble sequence to produce a second matched filter output sample stream. The receiver can determine that a sequence of pulses match the expected preamble sequence based on when the first matched filter output sample stream and the second matched filter output sample stream are above a minimum trigger level at the same time.