Research & Development

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

Source: Richard Langley

April 1, 2011

Innovation: GLONASS

By Richard B. Langley

Source: Richard Langley

March 1, 2011

Innovation: Realistic Randomization

By Richard B. Langley

Courtesy of Richard and Marg Langley.

February 1, 2011

Innovation: GNSS and the Ionosphere

By Richard B. Langley

FIGURE 1. Overall concept of search and rescue system. (Image: Cospas-Sarsat)

January 1, 2011

Innovation: The Distress Alerting Satellite System

By Richard B. Langley

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

Figure 4. The Oceanpal installation at Lake Laja, Chile.

September 1, 2010

Innovation: Friendly Reflections

By Richard B. Langley

Figure 3. The 21 GPS stations in the project area in the mountainous canton of Valais (see also Figure 2) used during the measurement campaign in July 2005. The stations’ altitudes vary between 527 meters (SION) and 3119 meters (ZER2).

July 1, 2010

Innovation: Better Weather Prediction Using GPS

By Richard B. Langley

By Tim Springer and Rolf Dach

June 1, 2010

Innovation: GPS, GLONASS and More

By Richard B. Langley

Figure 8. (a) Frequency distribution of 12 1-hour samples of GPS height data; (b) the 12 1-hour samples combined.

May 1, 2010

Innovation: Accuracy versus Precision

By Richard B. Langley

April 1, 2010

Innovation: GPS by the Numbers

By Richard B. Langley

March 1, 2010

Innovation: Hybrid Positioning

By Richard B. Langley

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