From the Magazine

PNT Roundup: Inertial, acoustic, lidar, Wi-Fi and beacon news

March 10, 2016By
Brandon Bordelon (top) carries aided inertial navigation systems for demanding subsea survey, construction and vessel positioning applications. Right: The position reference system on the ship’s command bridge.

Independence, redundancy at sea Acoustically aided inertial navigation technology will enable a specialized sea vessel maintain dynamic positioning through GNSS disruptions in challenging environments. Sonardyne Inc.‘s dual Ranger 2 Pro DP-INS systems aboard the ultra-light intervention vessel Brandon Bordelon will track remotely operated underwater vehicles (ROVs) during inspection, repair and maintenance activities, providing an independent position reference for the ship’s... read more

Expert Opinions: What key challenge should developers test for in a full PNT solution?

March 9, 2016By

Q: What key challenge should system integrators and product developers test for in a full position, navigation and timing solution? A: Spoofing is normally associated with the creation of false signals in order to generate a position error, but the same technique may be used to distort a timing solution. With GNSS timing systems being used in critical infrastructure, like... read more

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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

Opportunity for Accuracy: Terrestrial SOPs attractive supplement to GNSS

March 7, 2016By
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Exploiting terrestrial signals of opportunity (SOPs) can significantly reduce the vertical dilution of precision (VDOP) of a GNSS navigation solution. Simulation and experimental results show that adding cellular SOP observables is more effective in reducing VDOP than adding GNSS space vehicle (SV) observables. read more

Water utility deploys iPad solution

March 2, 2016By
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Like thousands of water utilities across the U.S., the City of Sebring, Fla., Utilities Department is tasked with providing a safe and reliable water supply, while managing all the dispersed assets of the water distribution and wastewater systems. This means regularly locating, mapping and inspecting assets to maintain service levels and operations. When Sebring evaluated this approach, the city received... read more

PNT Roundup: Inertial market outlook, 3D grows lidar, RoboParachute drops

February 22, 2016By
Blue Force Tracker units may add inertial to GPS for unit and individual soldier location.

Inertial effort underway for MGUE
The U.S. Air Force’s Joint Service Systems Management Office (JSSMO) has awarded Northrop Grumman Corporation an order to support embedded GPS/inertial navigation system (INS) pre-Phase 1 modernization efforts. read more

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Expert Opinions: Optimum number of GNSS signals for PNT device

February 22, 2016By

Q: What is the optimum number of GNSS signals to include/process in a consumer-grade PNT device? A: The cost for including additional silicon to a receiver for processing more signals is low, thanks to multiplexing hardware and high clock speeds. Having more satellite measurements allows the receiver to be selective about which ones it actually uses for PVT calculations, so... read more

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Antennas: The unsung heroes of the GNSS industry

February 22, 2016By

By Tracy Cozzens Managing Editor Antennas. When I was a kid, antennas meant the pair of rabbit ears sitting on top of the family TV set. We had to constantly adjust the angles to get the best reception, using aluminum foil to improve the signal. Wow, how things have changed. Today, consumer users of smartphones, Fitbits, smartwatches, tablets and a... read more