Doppler

January-February 2026 GPS World cover image

February 2, 2026

Modern Northstar: Starlink LEO PNT across land, air, stratosphere and Arctic Seas

By Zaher (Zak) M. Kassas, Samer Hayek, Will Barrett, Sharbel Kozhaya, Paul El-Kouba, Faezeh Mooseli, Jennifer Sanderson, and Joe Saroufim

Signal acquisition of Iridium NEXT satellites’ signal in the long baseline positioning scenario. (Credit: Aerospace Information Research Institute)

June 5, 2025

Low-cost antennas power high-precision space-based positioning

By Tracy Cozzens

October 23, 2017

Austria modernizes air traffic control with Thales Doppler system

By Tracy Cozzens

December 1, 2013

Directions 2014: Great Expectations

By GPS World Staff

Figure 1. Satellite tracking and carrier-phase anomaly summary during the observation time-span. These data were collected in a dense urban environment in both static and kinematic mode. The superimposed red-points show epochs where carrier-phase observables are either missing or contaminated with cycle slips, loss of locks, and/or other measurement anomalies.

May 1, 2011

Innovation: Doppler-Aided Positioning

By Richard B. Langley

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