In aviation navigation systems such as the Ground-Based and Space-Based Augmentation Systems (GBAS and SBAS) for GPS, it is critical for users to compute a conservative navigation-error bound during precision approach and landing. This paper describes a method for overbounding outputs of linear systems (i.e., conservatively describing their error distributions). Whereas earlier overbounding met...

Today, differential GPS techniques allow common GPS receivers to achieve the precision levels required for mapping purposes. The development of systems for mobile Internet access (mainly GPRS) provides a fast and reliable method for feeding differential corrections to a GPS receiver in any area covered by a cell telephone network. With the increase in the available bandwidth, and the example of...

Strong ionosphere storms are a potential threat for the Local Area Augmentation System (LAAS). During these storms, large spatial and temporal gradients of the ionosphere component on the GPS signals could cause significant errors in user position estimation. Mitigating these errors is demanding for LAAS, especially for Category III LAAS. Dual-frequency GPS techniques are known to be an effecti...

In this study, we develop methods to model and simulate road cycling on real-world courses, to analyze the performance of individual athletes and to identify and quantify potential performance improvement. The target is to instruct the athlete where and how to optimize his pacing strategy during a time trial. We review the state-of-the-art mechanical model for road cycling power that defines th...

In post-processing dual frequency GPS carrier phase data, the residual tropospheric delay can easily be the largest remaining error source. This error can contribute a bias in height of several centimetres even if simultaneously recorded meteorological data are used. This shortcoming is primarily due to the poor representation of the water vapour profile in the tropospheric delay models. In add...

When post-processing dual frequency carrier phase data, the residual tropospheric delay can easily be the largest remaining error source. This error can contribute a bias in height of several centimetres even if simultaneously recorded meteorological data are used. This is primarily due to the poor representation of the water vapour profile in the tropospheric delay models. In addition, a lack ...

The primary means for electronic position fixing in use contemporary maritime transport are shipborne GPS (Global Positioning System) receivers or DGPS (Differential GPS) receivers. More advanced GNSS Navigation Satellite RNSS (Regional Systems) able to process combined signals from American GPS, Russian GLONASS, Chinese Beidou (BDS), European Galileo, Indian IRNSS, and Japan QZSS. Satellite-ba...

The present study assessed the impact of computerised spirometry interpretation expert support on the diagnostic achievements of general practitioners (GPs), and on GPs' decision making in diagnosing chronic respiratory disease. A cluster-randomised controlled trial was performed in 78 GPs who each completed 10 standardised paper case descriptions. Intervention consisted of support for GPs' spi...

The leveling measurements have been traditionally made for the monitoring of ground subsidence, but this technique is known to be not timeand cost-effective. Instead, GPS has been recently used as one of the most convenient and precise techniques for the geodetic applications, in terms of high accuracy monitoring. A GPS monitoring network consisting of 52 GPS stations was set up in Yunlin Count...

The ionosphere can affect GPS receivers by degrading the signal strength, in some cases causing loss of carrier lock, and by degrading the accuracy of differential corrections. As we enter the solar maximum years, these effects will become more severe, causing frequent GPS outages in the polar and equatorial regions and over the entire North American landmass when magnetic storms occur. These i...