signal processing

March 1, 2011

Innovation: Realistic Randomization

By Richard B. Langley

February 14, 2011

u-blox, Rohde & Schwarz Successfully Simulate Galileo with u-blox Platform

By GPS World Staff

February 1, 2011

Innovation: GNSS and the Ionosphere

By Richard B. Langley

December 1, 2010

GNSS RF Compatibility Assessment: Interference among GPS, Galileo, and Compass

By GPS World Staff

Figure 2. GPS is visible in the spectrum only if a narrow resolution bandwidth is used. This spectrum was obtained with a center frequency of 1575.42 MHz, a frequency span of 4 MHz, a resolution bandwidth of 10 Hz, root-mean-square averaging with 20 averages, and a reference level of 250 dBm.

October 1, 2010

Innovation: Record, Replay, Rewind

By Richard B. Langley

September 1, 2010

Challenged Positions: Dynamic Sensor Network, Distributed GPS Aperture, and Inter-nodal Ranging Signals

By GPS World Staff

At the JPO. Frank Butterfield of Aerospace, Col. Parkinson, and Cdr. Bill Huston, deputy JPO director from the U.S. Navy, in the early 1970s. A model of a Phase I GPS satellite stands on the table between the latter two. (Credit: Bradford W. Parkinson and Stephen T. Powers)

June 1, 2010

Part 2: The Origins of GPS, Fighting to Survive

By GPS World Staff

Mathematician Bill Guier (l) and physicist George Weiffenbach (r), told APL Research Center director Frank T. McClure (c), about their success using Doppler tracking for satellites. “McClure’s brain started going into fast forward,” remembered John Dassoulas. “Knowing the navigational challenges the U.S. Navy faced, McClure said, ‘Well, if you can find out where the satellite is, you ought to be able to turn that problem upside down and find out where you are.’" (Credit: Bradford W. Parkinson and Stephen T. Powers)

May 1, 2010

Part 1: The Origins of GPS, and the Pioneers Who Launched the System

By GPS World Staff

November 1, 2009

On the Edge: Multipath Measures Snow Depth

By Alan Cameron

May 17, 2007

Antenna-Induced Biases in GNSS Receivers

By GPS World Staff

Innovation: Realistic Randomization

u-blox, Rohde & Schwarz Successfully Simulate Galileo with u-blox Platform

Innovation: GNSS and the Ionosphere

GNSS RF Compatibility Assessment: Interference among GPS, Galileo, and Compass

Innovation: Record, Replay, Rewind

Challenged Positions: Dynamic Sensor Network, Distributed GPS Aperture, and Inter-nodal Ranging Signals

Part 2: The Origins of GPS, Fighting to Survive

Part 1: The Origins of GPS, and the Pioneers Who Launched the System

On the Edge: Multipath Measures Snow Depth

Antenna-Induced Biases in GNSS Receivers

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