From the Magazine

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

Street Smart: 3D City Mapping and Modeling for Positioning with Multi-GNSS

July 1, 2015By
Figure 1. Example of the GNSS signal propagation using ray-tracing and a 3D building map.

A particle-filter-based positioning method using a 3D map to rectify the errors created by multipath and non-line-of-sight signals on the positioning result delivered by a low-cost single-frequency GPS receiver takes a multi-GNSS approach, using the combined signals of GPS, GLONASS and QZSS. The method outperforms conventional positioning in availability and positioning accuracy. It will likely be fused with other sensors in a future pedestrian navigation application. read more

Mobile Computing Product Showcase

June 29, 2015By
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From our July issue comes this showcase featuring products for surveyors, geographic information systems (GIS) professionals, field workers, and anyone who is looking to expand the capabilities of their smartphone or tablet. Dedicated Survey/Geospatial Three-Accuracy Series The LT500 series of handheld GPS receivers, LT500H/T/N, covers three accuracy ranges from sub-meter to centimeter. It is a cost-effective full GNSS positioning solution for survey,... 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

The System: SBAS Agree to Common Message

June 1, 2015By
current coverage (left) of WAAS, EGNOS and MSAS; 
long-term 2020–2025 (right) plan for dual-frequency, dual-GNSS WAAS-EGNOS-MSAS-SDCM-GAGAN.

Aircraft navigation and safety will benefit from enhanced, reliable satellite navigation signals on a seamless basis across much of the world in the 2020–2025 timeframe. read more

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Hey, AU! — Autonomous Unmanned News

May 29, 2015By
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In this special section, GPS World focuses on automous positioning and navigation technology, including unmanned aerial vehicles (UAVs), unmanned aircraft systems (UAS) and unmanned ground vehicles (UGVs). SenseFly Launches Intelligent Mapping and Inspection Drone SenseFly launched the eXom, a quadcopter for mapping and inspection, at the AUVSI Unmanned Systems show, held May 4–7 in Atlanta. The 3.7-pound quadcopter offers professionals such... read more

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Innovation: Robustness to Faults for a UAV

May 4, 2015By
FIGURE 3. Goldy flight control system.

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

Jammer Hunting with a UAV

May 4, 2015By
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A fully autonomous, unmanned aerial vehicle (UAV)-based system for locating GPS jammers, currently under development, seeks to localize a jammer to within 30 meters in less than 15 minutes in an area comparable to that of an airport. Ultimately, the design team targets the ability to locate multiple, simultaneous jammers, and navigate in intermittent GPS and GPS-denied environments using a... read more