From the Magazine

Innovation: Robustness to Faults for a UAV

May 4, 2015By
FIGURE 3. Goldy flight control system.

Integrated Navigation Systems Using Parallel Filtering
The authors look at the development of a robust navigation system employing a GNSS receiver, accelerometers, gyroscopes, magnetometers, an airspeed device and dead reckoning to supply a blended navigation solution to a flight control system on a small, unmanned aerial vehicle. read more

Jammer Hunting with a UAV

May 4, 2015By
spicer_opener_O

A fully autonomous, unmanned aerial vehicle (UAV)-based system for locating GPS jammers, currently under development, seeks to localize a jammer to within 30 meters in less than 15 minutes in an area comparable to that of an airport. Ultimately, the design team targets the ability to locate multiple, simultaneous jammers, and navigate in intermittent GPS and GPS-denied environments using a... read more

The Business — May 2015

May 1, 2015By

The Business section from the May 2015 issue. Download the PDF. Includes: Furuno Receiver Adopted for Parrot Bebop NovAtel Launches Relay RTK Radio Module Phantom 3 Has Indoor Positioning SBG Systems Selects Septentrio AsteRx4 for Apogee Series Hemisphere GNSS Offers RTK-Capable Antenna Applanix Offers Three New Marine Products Cobham Aeroflex Tester Used for ADS-B Briefs Events read more

This article is tagged with and posted in From the Magazine

Expert Advice: Sensor Fusion for Highly Automated Driving

May 1, 2015By
Novatel-opener_EA

High-Precision GNSS Needs Help for Continuous Localization Reliability By Siamak Akhlaghi Automotive safety and comfort functions, known as Advanced Driver Assistance Systems (ADAS), have become an essential part of modern vehicles. These functions assist drivers in the driving process, providing capabilities such as adaptive cruise control or highway driving mode. To achieve a desired level of performance, the position of the... read more

Innovation: Carrier-Phase Ambiguity Resolution

April 3, 2015By
FIGURE 9. Network used for the triple-frequency PPP study.

Handling the Biases for Improved Triple-Frequency PPP Convergence
Precise point positioning (PPP) can be considered a viable tool in the kitbag of GPS positioning techniques. One precision aspect of PPP is its use of carrier-phase measurements rather than just pseudoranges. But there is a catch. Often many epochs of measurements are needed for a position solution to converge to a sufficiently high accuracy. In this month’s column, we look at how using measurements from three satellite frequencies rather than just two can help. read more

Galileo E1, E5a Performance for Multi-Frequency, Multi-Constellation GBAS

April 1, 2015By
Pullen-Galileo-O

Analysis of new Galileo signals at an GBAS compares noise and multipath in their performance to GPS L1 and L5. Even after smoothing, Galileo signals perform somewhat better than GPS and are less sensitive to the smoothing time constant. read more

The System: Celebrating 20 Years of GPS

April 1, 2015By
GPSIIF-launch-ULA-8

April marks the 20th anniversary of GPS FOC. U.S. Air Force Space Command declared Full Operational Capability (FOC) for the GPS constellation April 27, 1995, signifying the system met all requirements with 24 operational Block II/IIA satellites in their assigned orbital slots and providing both the military Precise Positioning Service (PPS) performance standard and the civil Standard Positioning Service (SPS)... read more

Expert Advice: Taking Up Positions — Galileo and E112

March 31, 2015By
Andy-Proctor-T

Europe is looking at the imposition of Galileo as part of an A-GNSS technology push for E112 emergency calling applications. E112 processes currently do not specify performance criteria for the position location accuracy. read more