From the Magazine

Research: Algorithm based on BeiDou/GPS/IMU and anomalous driving detection

November 21, 2016By

By Rui Sun and Hongyang Bai, Nanjing University of Aeronautics and Astronautics, and Ke Han, Jun Hu and Washington Y. Ochieng, Imperial College London. Presented at ION GNSS+ 2016. An Integrated Algorithm Based on BeiDou/GPS/IMU and its Application for Anomalous Driving Detection This paper introduces an integrated algorithm for detecting lane-level anomalous driving. Lane-level high accuracy vehicle positioning is achieved... read more

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Research: Accelerating GNSS software receivers

November 16, 2016By
Diagram of Typical Code and carrier tracking loops in a GNSS receiver. Colored dotted-line boxes show functions implemented in SIMD technology. Lanes “16ic” are data streams whose items are complex numbers with real and imaginary components represented with 16-bit integers, whereas “32fc” indicates those with complex numbers with real and imaginary components in 32-bit floating point representation.

By Carles Fernandez–Prades, Javier Arribas and Pau Closas, Centre Tecnologic de Telecomunicacions de Catalunya, Spain. Presented at ION GNSS+, September 2016. This paper addresses both the efficiency and the portability of a computer program in charge of the baseband signal processing of a GNSS receiver. Efficiency, in this context, refers to optimizing the speed and memory requirements of the software... read more

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FAA releases National Airspace System Navigation Strategy

November 10, 2016By

The United States Federal Aviation Administration (FAA) has released its Performance-Based Navigation (PBN) National Airspace System (NAS) Navigation Strategy 2016, the result of a concerted year-long effort by FAA and aviation industry stakeholders. It describes how the FAA intends to transition U.S. NAS operations over the near- (2016–2020), mid- (2021–2025) and far-term (2025–2030) from predominantly point-to-point navigation, reliant on hundreds... read more

Innovation: Precise positioning using raw GPS measurements from Android smartphones

November 7, 2016By and
FIGURE 8. Position estimates as in Figure 7 but with precise external ionospheric information.

Precision GNSS for everyone
In this month’s column, we take a look at some initial efforts to independently process smartphone measurements. How good are the results? Read on. read more

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Launchpad: Timing receiver, AR smart glasses

November 5, 2016By

OEM GNSS receiver High precision for the mass market The Piksi Multi is a multi-band, multi-constellation receiver for the mass market. Autonomous devices require precision navigation, especially those that perform critical functions. The receiver uses real-time kinematics (RTK) technology, providing location solutions 100 times more accurate than traditional GPS. Piksi Multi supports GPS L1/L2 and is hardware-ready for GLONASS G1/G2,... read more

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The System: First OCX receiver delivered to Air Force

November 3, 2016By
The first eight GPS III satellites are under contract and in production at Lockheed Martin’s GPS III Processing Facility outside of Denver.

Harris Corporation delivered the first of 34 modernized receivers to support the GPS Next-Generation Operational Control System (OCX). They will receive the signals sent by the current GPS satellite constellation plus the new signals sent by the next generation GPS III — 13 military and civilian signals in all. The receiver was shipped to the prime contractor, Raytheon Company, in... read more

Make it real: Developing a test framework for PNT systems and devices


Tests of the robustness of commercial GNSS devices against threats show that different receivers behave differently in the presence of the same threat vectors. A risk-assessment framework for PNT systems can gauge real-world threat vectors, then the most appropriate and cost-effective mitigation can be selected. Vulnerabilities of GNSS positioning, navigation and timing are a consequence of the signals’ very low... read more

Testing susceptibility to GPS spoofing

October 30, 2016By
The Vulnerability Test System.

Spoofing as it applies to GPS is an attempt to deceive a GPS receiver by broadcasting signals that the receiver will use instead of the live sky signals. Spoofing is different from jamming. Jamming is easier for a receiver to detect, and while it can disrupt the receiver, it cannot relocate it. Spoofing can be used as an attack on... read more

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