James L Farrell Blog

  • Elmen C. Quesinberry

    Earlier this year I wrote a belated tribute to a well-known pioneer in strapdown. Now I must write another tribute, even more belated, to a
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  • Nav Course in India

    Prof. H.B. Hablani from Dept Aerospace Engrg, Indian Institute of Technology (Bombay) recently taught a 5-day course on integrated navigation,
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  • NOW IT’S ALL FLIGHT-VALIDATED (The Case Builds)

    In 2013 a phone presentation was arranged, for me to talk for an hour with a couple dozen engineers at Raytheon. The original plan was
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  • INFRASTRUCTURE

    The sky isn't falling but some of our bridges are. About seventy thousand of them are structurally deficient, and about a quarter of those could
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  • John Bortz

    In February of this year the navigation community lost a major contributor to navigation -- John Bortz. To many his name is best known in
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  • 1-sec Carrier Phase (again)

     A comment challenged my video .  I'm glad it included an acknowledgment that some points might have been missed. To be frank that happened a
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  • New Kindle Book – GPS Made Simple

    4/11/2013Press Release   James L Farrell launches his new Kindle book - GPS Made Simple   James L Farrell, author of  GNSS Aided Navigation
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  • Avionics Commonality

    A LinkedIn discussion centered on the Future Airborne Capability Environment (FACE) standard contained an important observation concerning
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  • Open System Architecture for Radar

    Significant momentum is evolving toward a role for Open System Architecture (OSA) applied to radar. My observations in connection with that,
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  • CONING in STRAPDOWN SYSTEMS

    Free-inertial navigation uses accelerometers and gyros alone, unaided. For that purpose pioneers of yesteryear developed a variety of techniques,
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  • LORAN REVISITED

    Now that several years have passed since the LORAN-C budget was killed, it might be a good time to revisit that decision. Unlike other decisions,
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  • James L. Farrell featured in April Cover Story of Coordinates Magazine

    Click the image to view the full article now!