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Alison Brown stands in front of the first GPS-enabled cell phone, designed by NAVSYS and on display at the Smithsonian “Time and Navigation” exhibit in the Air and Space Museum in Washington, D.C. (Click image to enlarge.)

Alison Brown’s Compass Points

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Engineering Specialties

Systems design, algorithm design, systems integration and testing

GNSS Event that most signifies to you that GNSS has “arrived”.

Selective Availability being disabled to allow commercial users to benefit from full accuracy of GPS

Engineering Mentor

My father, Ken Brown, chief engineer for Ferranti and a UK pioneer in developing inertial navigation systems for aircraft, space vehicles, and ships. (Ferranti was a UK engineering firm heavily involved in radar development, electromechanical integrated navigation systems, electro-optics and Mark I, the first commercial computer.)

Patents Held

  • “Apparatus and Method for Minimizing Multipath Signal Errors During Tracking of GPS Satellite Signals,” 2004, U.S. Patent No. 6,727,846
  • “Miniature Phased Array Antenna System,” 2001, U.S. Patent No. 6,246,369 
  • “GPS Precision Approach and Landing System for Aircraft,” 1994, U.S. Patent No. 5,311,194 
  • “Vehicle Tracking System Employing GPS Satellites,” 1993, U.S. Patent No. 5,225,842 
  • “GPS Tracking System,” 1995, U.S. Patent No. 5,379,224 
  • “Digital System for Codeless Phase Measurement,” 1989, U.S. Patent No. 4,862,178 
  • “Attitude Sensing System,” 1988, U.S. Patent No. 4,754,280 
  • “Enhanced GPS Delta Range Processing,” 1987, U.S. Patent No. 4,646,096
  • “Method and Apparatus for Reducing Quantization Error in Laser Gyro Test Data through High Speed Filtering,” 1987, U.S. Patent No. 4,634,283

Other technologies you use frequently

Inertial measurement units and navigation systems.

What popular notions about GNSS most annoy you?

That receivers “talk” to the satellites!

Favorite equation

PR = c(trx-ttx)

PR: pseudo-range (m)
trx: time of reception (sec)
ttx: time of transmission (sec)
C: speed of light (m/s)

As a consumer, what GNSS product, application, or engineering innovation would you most like to see?

GPS “dot” as in the Da Vinci Code movie.

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