From the Magazine

Intelligent transportation systems require ‘the ego vehicle’

May 8, 2017By

Most activity so far in the PNT community has centered around the questions of “Where am I?” and “Where am I going?” and “How fast am I going?” Positioning, navigation and timing. Seemingly that should about cover it. But no. Mapping comes into the picture: “What fixed objects are in my environment?” This is actually a corollary of “Where am... read more

V2V countdown: Major players on how we get there

May 2, 2017By

We asked major players in the connected vehicles marketplace for their views on expected deployment timelines, remaining challenges such as reliable positioning technology, integration with existing systems, and the implications on autonomous vehicle technology. read more

System of Systems: Brexit may oust UK from Galileo work

April 26, 2017By

Brexit May Oust U.K. from Galileo Work Participation of the United Kingdom space industry in Galileo may be in doubt as negotiations get underway on details of the U.K. withdrawal from the European Union (EU). European Commission officials signaled that they want to rely solely on producers within the European Union for the block’s major programs, citing security concerns such... read more

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Research Online: GPS UTC anomaly, spatial reference system access

April 26, 2017By

Impact of January 2016 GPS UTC Anomaly By Charles Curry / Presented at ION ITM, January 2017 On Jan. 26, 2016 alarms occurred on GPS timing receivers around the globe. This article tells the story as experienced by the Chronos support team over a four-day period, dealing with nearly 5,000 alarm events from many different GPS timing receivers worldwide. It... read more

Innovation: Orbit determination of LEO satellites with real-time corrections

Precision on board
Described are the results of realistic simulations carried out to precisely position a low-Earth-orbit satellite using a source of real-time GPS corrections actually transmitted by a network of geostationary satellites. Even accounting for data outages, 3D positioning accuracies better than a decimeter have been obtained. Precision on board? Not right now but likely coming real soon. read more

Backpacks for enhanced work travel, efficiency

April 12, 2017By

It’s conference season again. Every year I struggle with the best way to tote my MacBook Pro, DSLR camera and all the acoutrements I haul around as part of my job. No doubt you, too, need to travel with expensive electronics you want to protect from damage or theft. Determined to find the best solution for my trip in May... read more

Report: UAV sector on the upsurge

April 5, 2017By

Where It’s At, Where It’s Heading Assessing the health of an entire industry is not an easy task, but talking with industry leaders and looking for examples of growth and investment can help. My inquiries have led to discussions with General Atomics, Association for Unmanned Vehicle Systems International (AUVSI), Aeryon Labs and SensoFusion. Further viewpoints welcome; see the conclusion of... read more

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LTE cellular steers UAV: Signals of opportunity work in challenged environments

No GPS? No Problem! Long-term evolution (LTE) cellular signals can be exploited for accurate and resilient autonomous vehicle navigation in the absence of clear GNSS signals. Simulation and experimental results demonstrate that GPS-like performance can be achieved in the absence of GPS signals when cellular pseudoranges aid an inertial navigation system. By Zaher M. Kassas, Joshua J. Morales, Kimia Shamaei,... read more