The aviation industry’s increasing reliance on GPS to facilitate navigation and air traffic monitoring opens new attack vectors with the purpose of hijacking UAVs or interfering with air safety. We propose Crowd-GPS-Sec to detect and localize GPS spoofing attacks on moving airborne targets such as UAVs or commercial airliners. Unlike previous attempts to secure GPS, Crowd-GPS-Sec neither requir...

BACKGROUND Given the importance of community-based research, there is a need to ensure the quality of data obtained from such studies. However, research has been considered a low priority for most GPs. OBJECTIVES To assess the quality of data reported by GPs in a large community-based study. METHODS Men were recruited as part of a population-based study on prostate-specific antigen (PSA) te...

OBJECTIVE To evaluate a hospital-based psychiatric consultation service for patients referred by general practitioners (GPs), and the effect on its use of a focused marketing strategy aimed at GPs. DESIGN AND SETTING Postal survey of GPs in the catchment area (inner north Brisbane, Queensland), September to November 2003; and assessment of referrals, March to August 2003. MAIN OUTCOME MEASU...

Carrier phase based DGPS systems have been used for airborne mapping for many years. Integrated GPS/INS systems are also becoming popular in order to improve the positioning accuracy, system reliability and achieve direct geo-referencing. However, this approach is limited by the current GPS constellation. Further improvement is required to achieve centimetre level positioning accuracy, which be...

AIMS To (i) compare the views of general practitioners (GPs) and parents about the causes, consequences and management of childhood overweight/obesity; and (ii) explore the extent to which they can identify overweight/obesity in children. METHODS A questionnaire was mailed to all GPs in one Primary Care Trust and all parents in one primary school in southern England, 2008. Information was gat...

There is growing concern regarding the ability of GPS receivers to operate in the presence of in-band or nearband interference. In-band interference can occur deliberately from GPS jammers or naturally from spurious harmonics from nearby electronics that generate signal products that land in the GPS signal band. To support development and testing of GPS receivers in an interference environment,...

BACKGROUND The role of general practitioners (GPs) as reservoir and potential source for Staphylococcus aureus (SA) transmission is unknown. Our primary objective was to evaluate the prevalence of SA and community-acquired methicillin resistant SA (CA-MRSA) carrier status (including spa typing) among GPs and their patients in Belgium. The secondary objective was to determine the association bet...

Applications of unmanned vehicles can increase combat effectiveness and personnel safety. These include reconnaissance, surveillance, target acquisition, logistics, minefield and other obstacle detection, explosive disposal, physical security, and operations in contaminated environments. Better communication and GPS technologies are necessary for a convoy of unmanned vehicles to accurately foll...

The University of Nottingham Ningbo China (UNNC) has full access to the Beidou system, QZSS, GLONASS, Galileo and GPS on its campus. Currently UNNC has a number of GNSS receivers that can access the multi-GNSS constellation, these being a ComNav K508 triple frequency GPS/BeiDou/GLONASS system, Unicore UR240-CORS-II and UR240-RTK GPS/BeiDou receivers, Javad SIGMA and TIUMPH-VS multi GNSS receive...