Using GPS Multipath for Snow-Depth Estimation
In this month’s column, we look at a technique that uses interference fringes generated by signals arriving at an antenna directly from GPS satellites and those reflected by snow surrounding the antenna to measure its depth and how it varies over time. GPS for measuring snow depth; who would have thought?
A Hansel and Gretel Approach to Cooperative Vehicle Positioning
Several technologies are being developed for accurate cooperative vehicle positioning, but GNSS also has a role to play. In this month’s column, team of British researchers turn to a children’s fairy tale for inspiration in their development of a cooperative vehicle positioning approach using carrier-phase observations — another innovative application of real-time kinematic or RTK GNSS technology.
Performance of the Galileo Single-Frequency Ionospheric Correction During In-Orbit ValidationIn this month’s column, a team of researchers from ESTEC describe the European way for modeling the ionosphere for single-frequency users and compare its performance to the current GPS approach.
How a Chip-Scale Atomic Clock Can Help Mitigate Broadband Interference
Small low-power atomic clocks can enhance the performance of GPS receivers in a number of ways, including enhanced code-acquisition capability that precise long-term timing allows. And, it turns out, such clocks can effectively mitigate wideband radio frequency interference coming from GPS jammers. We learn how in this month’s column.
Combining Galileo with GPS and GLONASSWhile a GPS-based GBAS will offer improved navigation services for aircraft, might these services be even better if the systems were to use satellites from other constellations besides GPS? In this month’s column, the authors show how GBAS protocols might be modified to accommodate multiple constellations, offering results of preliminary tests using GPS, GLONASS, and Galileo simultaneously.
Automating GNSS Receiver Testing
In this month’s column, the authors discuss an automated test bench for analyzing the overall performance of multi-frequency multi-constellation GNSS receivers.
Greater Fidelity Using a 3D Approach
In this month’s column we look at the performance of a 3D approach to modeling the ionosphere, including times when the ionosphere is particularly interesting (read disturbed).
Detection and Correction Using Inertial Aiding
A team of university researchers has developed a technique combining GPS receivers with an inexpensive inertial measuring unit to detect and repair cycle slips with the potential to operate in real time.
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