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New Builds • August 7, 2012

Trimble Launches AP20-C GNSS Inertial OEM Module MEMS Sensors

Trimble introduced its AP20-C, the latest addition to its AP Series of embedded GNSS-inertial OEM boards, at AUVSI’s Unmanned Systems North America 2012 Conference and Exhibition today (August 7, 2012).

Incorporating a compact, custom-built inertial measurement unit (IMU) based on commercial micro-electromechanical mechnical system (MEMS) sensors, the AP20-C enables system integrators to achieve high-rate position and orientation measurements with exceptional accuracy, according to the company.

July 31, 2012

UAVs: Homeland Security Under Pressure to Take a Greater Role in GPS Anti-Spoofing

A congressional committee overseeing activities at the Department of Homeland Security (DHS) appears poised to push the agency into a more substantive role in overseeing the use of drones in the United States — a move that could force DHS to move more forcefully to protect GPS users from spoofing.

The Subcommittee on Oversight, Investigation and Management within the House Homeland Security Committee is looking to DHS to manage the civil use of unmanned aerial vehicles (UAVs) or drones.

August 1, 2012

House, Defense Department Move to Bridge GPS Modernization Funding Gap

Both Congress and the Pentagon are putting money on the table to bridge the gap created by delays in the development of the new GPS ground system.

As Inside GNSS first reported earlier this year the Next Generation Operational Control System, or OCX, is running roughly two years behind schedule. It had been expected to be delivered in 2015, however, General William L. Shelton, the commander of Air Force Space Command, said this spring that OCX would be delayed until 2016 or 2017.

Inside GNSS • July/August 2012

Interference & Jamming

The threats just keep growing to a resource that hundreds of millions of people around the world have come to rely on for a myriad purposes.

GNSS is, after all, an RF technology, vulnerable in its own way to the kind of disruptive effects that turn an AM radio into a static-ridden howl as you drive under a powerline. And the radiated energy of signals arriving with from satellite sources tens of thousands of miles away are orders of magnitude weaker than those carrying the top 40 tunes broadcast by a local station.

July 17, 2012

Election Politics May Stall Final LightSquared Decision

While members of the GPS community are pushing to formally end the threat of signal interference from LightSquared’s proposed wireless network, the political realities of an election year suggest they will have to wait for a decision.

“There are not a lot of reasons to rush,” said Tim Farrar of TMF Associates, a consulting firm that closely follows mobile communications industry, adding it was “unlikely” there would be any progress ahead of the vote in November.

July 16, 2012

UAVs Vulnerable to Civil GPS Spoofing

In June a research team from the University of Texas at Austin (UT-Austin) demonstrated for the first time that a civilian unmanned aerial vehicle (UAV) can be commandeered in mid-flight by a civil GPS spoofing attack. The result will likely factor into the Federal Aviation Administration’s (FAA’s) plans to draw up rules for integrating UAVs into U.S. airspace by 2015.

July 18, 2012

Brit Military Visit May Hasten Resolution of GPS Signal Patent Dispute

The U.S. visit of a high-level official from the British Ministry of Defense (MoD) is spurring efforts to settle a dispute over a patent that could drive up prices on satellite navigation receivers for users around the world.

July 13, 2012

Galileo SVs Test ‘Dummy’ MBOC Signal in Space

The first two Galileo in-orbit validation (IOV) satellites in space have achieved a new milestone, transmitting dummy signals in a modulation scheme designed to allow full interoperability with GPS once operational services start.

“This is an advanced modulation technique that offers robust protection against signal interference and the misleading signal reflections known as ‘multipath’,” said Marco Falcone, Head of Galileo System Services.

October 1, 2012 - October 3, 2012
Cairo, Egypt
GNSS Solutions • July/August 2012

Single- versus Dual-Frequency Precise Point Positioning

Q: What are the tradeoffs between using L1-only and L1+L2 for PPP?

A: Precise point positioning (PPP) is a technique that can compute positions with a high accuracy anywhere on the globe using a single GNSS receiver. It relies on highly accurate satellite position and clock data that can be downloaded from the International GNSS Service (IGS) or obtained in real-time from a number of service providers, using either the Internet or satellite links.

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