From the Magazine

Kuwait high-rise goes up with assist from BeiDou

May 9, 2016By
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CORS station tracks China’s constellation over three frequencies. Headquarters for the National Bank of Kuwait, a new 300-meter-tall building under construction, combines concrete, steel, glazing and glass-reinforced concrete in a unique shellfish shape. The engineering challenges behind this building led the engineers of Ahmadiah Company, the contractor, to use GNSS technology to install the core wall structure with millimeter accuracy.... read more

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GSA: 40 percent of GNSS receivers are Galileo-ready

May 9, 2016By
Figure 2. Supported constellation by receivers, all segments.

60 percent support two or more constellations Chipset and receiver manufacturers are already equipping their devices with multi-constellation capabilities, including Galileo, and taking advantage of available services, according to a new analysis by the European GNSS Agency (GSA). The study examines the global top 31 companies and reviews publicly available technical documentation on their product portfolios, for more than 300... read more

Laser ranging plus GNSS

May 4, 2016By
Automotive nagivation suite.

Context-dependent scan matching for aided navigation By Jyh-Ching Juang, Shang-Lin Yu and Shun-Hung Chen Context-dependent scan matching for aided navigation — finding the rotation and translation that best align two consecutive scans — provides laser-ranging data that can be blended into a GNSS navigation system. A quality index based on analysis of intra-frame point clouds assesses the scan context, accounting for variations... read more

Innovation: Quo vademus

May 3, 2016By
FIGURE 12. Tightly coupled positioning trajectory for test drive in Braunschweig.

Future automotive GNSS positioning in urban scenarios
Driving in built-up areas, buildings can block the signals from GPS satellites. But if the receiver can access the signals of two or more GNSSs, position fixes might be available where none were possible with GPS alone, and the accuracies of marginal fixes might be improved. The authors look at using multi-GNSS for navigating in the heart of a city and how the additional signals can help us to get where we’re going. read more

System of Systems: OCX passes first qualification

May 1, 2016By
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OCX Passes First Qualification Raytheon, US Air Force Complete Test Milestone On March 4, Raytheon successfully passed the first formal qualification test milestone for the U.S. Air Force’s GPS Next Generation Operational Control System (GPS OCX). The new system offers significant improvements to the GPS on which the U.S. military and millions of civilians rely, including enhanced availability, accuracy and... read more

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Research Online: Integer ambiguity resolution in GPS/INS, UAV multiple laser-inertial nav

April 8, 2016By

Integer ambiguity resolution in multi-epoch GPS/INS   A novel integer ambiguity resolution approach over a time window of GPS/IMU data enhances the reliability of obtaining high-accuracy position estimation, using carrier phase measurements, even in challenging environments. The method focuses on reducing computational cost. The achievable savings should be on the order of 104, while 600 has been demonstrated. The theoretical... read more

Innovation: Flying safe

April 4, 2016By
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GNSS robustness for unmanned aircraft systems
When siting the antenna of a GNSS receiver or designing a GNSS-based navigation system, electromagnetic compatibility is an important concern. This is particularly true for airborne platforms. In this month’s cover story, we take a look at how radio-frequency interference can impact GNSS equipment on unmanned aircraft systems and how robustly the equipment can navigate those systems. read more

Autonomous relative navigation

April 1, 2016By
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Future UAVs will require relative navigation capability to fulfill a broad range of assisted manned and unmanned missions. A new approach, demonstrated in application to aerial refueling, provides access to accurate relative time-space positioning information (R-TSPI) between platforms. By Shahram Moafipoor, Jeffrey A. Fayman, Lydia Bock and David Honcik The advent of unmanned aerial vehicles (UAVs) highlights the importance of precise... read more