Gérard Lachapelle

A team of researchers from The University of Calgary report on tests conducted on two different types of GPS antennas operated in the vicinity of a human phantom — an artificial body with similar electromagnetic properties as that of a real human.

Most anti-spoofing techniques are computationally complicated or limited to a specific spoofing scenario. A new approach uses a two-antenna array to steer a null toward the direction of the spoofing signals, taking advantage of the spatial filtering and the periodicity of the authentic and spoofing...more >>

Spatial and temporal information of signals received from multiple antennas can be applied to mitigate the impact of new GPS and Galileo signals’ binary-offset sub-carrier, reducing multipath and interference effects.

A fuzzy tracking system performs as a narrow bandwidth tracking system in terms of noise reduction, and a wide bandwidth tracking system in terms of dynamic response, overcoming the contradiction between receiver bandwidth requirements using classical tracking techniques for either noise reduction...more >>

The impact of adding GLONASS to HS-GPS is assessed using a software receiver operating in an actual urban canyon environment. Results are compared with standard and high sensitivity GNSS receivers and show a significant improvement in the availability of position solutions when GLONASS is added. An...more >>

Communication-enabled vehicle safety has the potential to change transportation’s future, particularly vehicle-to-vehicle (V2V) and vehicle-to-infrastructure (V2I), collectively represented as V2X. An automakers’ consortium conducted extensive field trials to determine GNSS service availability...more >>

Competitive alpine skiers win or lose races by fractions of a second. Research has explored GNSS potential to provide position information to skiers and instructors during training. However, to date the size, weight, autonomy, accuracy, and availability performance have posed major obstacles to...more >>

The current GPS constellation of 30+ satellites provides a high level of availability, reliability, and accuracy to users. Centimeter-level accuracy requires the use of carrier-phase measurements and the resolution of associated integer ambiguities; success is a function of the number of satellites...more >>

In recent years, GPS has made a strong impact on the running community. Wrist-top GPS-equipped running computers tell runners not only their current pace, but also provide trajectory, speed, distance traveled, and a host of other scrutable statistics. The combination of position and speed anywhere...more >>

The weak GPS signal, designed for open-sky users, has proven to be of limited use indoors but is nevertheless being slowly adopted as a solution for location-based services. While numerous cellular service providers are using GPS to meet E-911 requirements, indoor availability and accuracy still...more >>