Pulse or digital communications – Receivers – Interference or noise reduction
Reexamination Certificate
2005-01-11
2005-01-11
Ha, Dac V. (Department: 2634)
Pulse or digital communications
Receivers
Interference or noise reduction
C455S063300, C455S227000, C455S278100, C455S307000
Reexamination Certificate
active
06842498
ABSTRACT:
Systems and methods are described for a GPS receiver capable of functioning in the presence of interference. A method includes detecting an interfering signal including: tuning a band pass filter over a frequency range; and at each of a plurality of incremental frequencies: computing a set of band pass filter coefficients; sending the set of band pass filter coefficients to a digital filter; repeatedly transforming an analog-to-digital converter output having a quantization level in excess of 2 bits into a band pass filter output with the digital filter to obtain a plurality of samples; computing an average of the plurality of samples; and comparing the average to a threshold to detect peaks that exceed a threshold. An apparatus includes: an analog radio frequency circuit; an analog-to-digital converter coupled to the analog radio frequency circuit, the analog-to-digital converter providing a quantization level in excess of 2 bits; a digital filter coupled to the analog-to-digital converter; and a digital circuit coupled to the digital filter.
REFERENCES:
patent: 5268927 (1993-12-01), Dimos et al.
patent: 5375146 (1994-12-01), Chalmers
patent: 5694416 (1997-12-01), Johnson
patent: 5717717 (1998-02-01), Yang et al.
patent: 5872540 (1999-02-01), Casabona et al.
patent: 5930310 (1999-07-01), Freeman
patent: 6115409 (2000-09-01), Upadhyay et al.
patent: 6118499 (2000-09-01), Fang
patent: 6141371 (2000-10-01), Holmes et al.
patent: 6240150 (2001-05-01), Darveau et al.
patent: 0 987 829 (2000-03-01), None
“Eleventh International Technical Meeting of the Satellite Division of the Institute of Navigation,” ION-GPS 1998, CD-ROM.
“Navigation 2000,” Proceeds of the National Technical Meeting of the Institute of Navigation, 1998.
Fante, et al., “Enhanced Anti-Jam Capacity for GPS Receivers,” The MITRE Corporation, Bedford, MA 01730, 251-254.
Lopez-Almansa, et al., “Measurement Error and Protection Envelopes in the Presence of Interference for GNSS Receivers,” TTC & RF Navigation Section, European Space Agency ESA-ESTEC (The Netherlands), 797-807.
Lyusin, et al., “Combined GPS/GLONASS Receiver with High Antijamming Performance,” Magellan Corp. Moscow Development Center, 775-782.
Moulin, et al., “High-Performance RF-to-Digital Translators for GPS Anti-Jam Applications,” the MITRE Corporation, 233-239.
Zhodzishsky, et al., “In-Band Interference Suppression for GPS/GLONASS,” Javad Positioning Systems, 769-773.
Heinzl Johann
Jacobsen Gary
Shenoi Kishan
Yang Jining
Ha Dac V.
John Bruckner PC
Symmetricom, Inc.
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