Innovation

Innovation: Enhanced Loran

November 23, 2015By

A Wide-Area Multi-Application PNT Resiliency Solution
Enhanced Loran could furnish the wide-area complementary solution to GPS that is urgently needed for critical infrastructure components. This article highlights the state of current eLoran technology and discusses future potential. read more

Innovation: Faster, Higher, Stronger

October 8, 2015By

Proposed GNSS Navigation Messages for Improved Performance
In this month’s column, we look at proposed changes to the way navigation messages are formulated that could result in a future satellite navigation system providing faster fixes effectively giving receivers higher sensitivity and stronger performance. read more

Innovation: Getting There by Tuning In

September 4, 2015By

Using HD Radio Signals for Navigation By Ananta Vidyarthi, H. Howard Fan and Stewart DeVilbiss THE YEAR WAS 1906. On Christmas Eve of that year, Canadian inventor Reginald Fessenden carried out the first amplitude modulation (AM) radio broadcast of voice and music. He used a high-speed alternator capable of rotating at up to 20,000 revolutions per minute (rpm). Connected to... read more

Innovation: Seeing the Light

July 1, 2015By

We look at the development of a generalized vision-aided integrity monitor for precision relative navigation applications. A vision-aided integrity monitor could be extremely valuable in augmenting existing precision relative navigation systems, such as GPS, for many different safety-critical aerospace applications. read more

Innovation: Carrier-Phase RF Ranging

June 8, 2015By

Precise, Accurate and Multipath-Resistant Distance and Speed Measurements
In this month’s column, we take a look at a short-distance two-way ranging system using a 5.8-GHz carrier to supply not only precise and accurate distance measurements but also complementary measurements of speed. read more

Innovation: Robustness to Faults for a UAV

May 4, 2015By

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

Innovation: Carrier-Phase Ambiguity Resolution

April 3, 2015By

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

Innovation: Where Are We?

March 5, 2015By

Positioning in Challenging Environments Using Ultra-Wideband Sensor Networks
The use of large transmission bandwidths offers a number of benefits, including accurate ranging and that application in particular is being actively developed for positioning and navigation in environments that are challenging to GNSS such as indoors and built-up areas. In this month’s column, we take a look at the work being carried out in this area by a team of researchers at The Ohio State University. read more