Innovation: Clarifying the ambiguities

March 8, 2016By
FIGURE 1. Public providers of PPP-AR products.

Examining the interoperability of precise point positioning products
Our authors look at the interoperability of PPP ambiguity resolution products distributed by several research organizations for improving position solutions. read more

Innovation: Null-steering antennas

February 11, 2016By
FIGURE 1. Geometry of antenna array consisting of seven dual-frequency (L1, L2), dual polarized (RHCP, LHCP) elements arranged on a circular ground plane.

Assessing the performance of multi-antenna interference-rejection techniques
Several factors affect the levels of signal rejection using antenna arrays. Our authors describe experiments to assess the bounds the factors impose on its signal rejection capability. read more

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Innovation: Guidance for road and track

January 14, 2016By
FIGURE 2. SF-PPP solution displayed on a 5-centimeter accurate road infrastructure map, on Dec. 18, 2014.

Real-time single-frequency precise point positioning for cars and trains
In this month’s Innovation column, we bring together, perhaps for the first time, single-frequency and real-time PPP. Our authors describe a series of experiments they have conducted on roadways and a railway achieving sub-meter horizontal positioning at a 95 percent confidence interval. Such accuracies may already be sufficient for freeway lane and railway track guidance. But we might expect even better accuracies in the future. After all, PPP is getting better all the time. read more

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
FIGURE 2. Typical sequence of position fix process in standalone GPS user equipment (Msr=measurements).

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
FIGURE 8. Worst-case result for five-transmitter tracking. (Photo map courtesy of Google.)

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
FIGURE 2. GRD-based image correspondence illustration as a function of 2-D relative navigation state.

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
FIGURE 10. Histogram showing carrier-phase range accuracy.

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