Patents by Inventor Neil David Fox

Neil David Fox has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • FFT-based filtering for low-quality signal direction finding
    Patent number: 6469657
    Abstract: A radio direction finding system for a low signal quality transmission signal performs a Fast Fourier Transform (FFT) on an entire received RF band into a number of FFT bins, each serving as an IF filter. The contents of each FFT bin are demodulated to decode a frequency signature from the encoded RF signal. A signal-to-noise ratio comparator receives the FFT baseband samples and determines the signal level from the known frequency signature. The FFT baseband buffer with the greatest SNR corresponding to a particular FFT frequency bin is outputted as a direction finding metric.
    Type: Grant
    Filed: October 10, 2001
    Date of Patent: October 22, 2002
    Assignee: ITT Manufacturing Enterprises, Inc.
    Inventor: Neil David Fox
  • Detection of emissions from commercial electronic devices that include an amplitude modulation component
    Patent number: 6437741
    Abstract: A direction finder apparatus and method are provided. The direction finder apparatus includes an antenna system, a RF front end, and an analog signal detector that detects an electromagnetic signal and provides in response a characteristic signal without an underlying carrier wave. The direction finder apparatus further includes an analog-to-digital (A/D) converter, a fast Fourier transform (FFT) processor that produces a plurality of component frequency approximations representing frequency components of the AM signal, a plurality of storage bins, and a post-processor. The post-processor determines a maximum S/N ratio from among the plurality of component frequency approximations. A direction of arrival (DOA) angle of the RF signal is determined when the antenna system is oriented to produce a maximum S/N ratio.
    Type: Grant
    Filed: January 10, 2001
    Date of Patent: August 20, 2002
    Assignee: ITT Manufacturing Enterprises, Inc.
    Inventor: Neil David Fox
  • DETECTION OF EMISSIONS FROM COMMERCIAL ELECTRONIC DEVICES THAT INCLUDE AN AMPLITUDE MODULATION COMPONENT
    Publication number: 20020089449
    Abstract: A direction finder apparatus and method are provided. The direction finder apparatus includes an antenna system, a RF front end, and an analog signal detector that detects an electromagnetic signal and provides in response a characteristic signal without an underlying carrier wave. The direction finder apparatus further includes an analog-to-digital (A/D) converter, a fast Fourier transform (FFT) processor that produces a plurality of component frequency approximations representing frequency components of the AM signal, a plurality of storage bins, and a post-processor. The post-processor determines a maximum S/N ratio from among the plurality of component frequency approximations. A direction of arrival (DOA) angle of the RF signal is determined when the antenna system is oriented to produce a maximum S/N ratio.
    Type: Application
    Filed: January 10, 2001
    Publication date: July 11, 2002
    Inventor: Neil David Fox