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GNSS (all systems)

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January 1, 2018

What is navigation message authentication?

Q: What is navigation message authentication?  

A: As of today, all open civil GNSS signals are transmitted in the clear, conforming to interface specifications that are fully available in the public domain. Receivers will accept any input that conforms to the specifications and treat it as if it came from a GNSS satellite. Combined with the extremely low power levels of GNSS signals this makes it almost trivially simple to spoof a GNSS receiver.

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By Inside GNSS
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How Effective Are Signal Quality Monitoring Techniques

Multipath is a major phenomenon that degrades the integrity of GNSS-based navigation services. Under multipath, a receiver Delay-Lock Loop (DLL) does not correctly estimate the actual peak of the correlation curve, resulting in ranging errors. To overcome this effect, mitigation techniques have been developed, a detailed discussion of which

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By Inside GNSS
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Honeywell IMUs Bringing Pinpoint Navigation Accuracy to New Industries
December 19, 2017

Honeywell IMUs Bringing Pinpoint Navigation Accuracy to New Industries

The HG4930 is designed to meet the motion sensing needs of a range of applications across various markets. Photo courtesy of Honeywell Aerospace.

Long established as a key component within defense applications, navigation technology from Honeywell is now available to a wide range of new industries that can benefit from the advanced precision and performance of reliable, rugged and easy-to-install Inertial Measurement Units (IMUs).

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By Inside GNSS
Harris Corp. Delivers Fourth GPS III Satellite Navigation Payload; Establishing a Proven, Reliable Production Cadence
December 15, 2017

Harris Corp. Delivers Fourth GPS III Satellite Navigation Payload; Establishing a Proven, Reliable Production Cadence

Completing the fourth delivery of 10 navigation payloads for Lockheed Martin’s GPS III satellites, Harris Corporation delivered the advanced navigation payload for the fourth GPS III Space Vehicle (SV04) to Lockheed Martin on October 29 – establishing a proven and reliable production cadence. Harris delivered two payloads in 2017 and is committed to delivering four more in 2018.

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By Inside GNSS
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Ariane 5 Mission with 4 Galileo Satellites set for Dec. 12 Liftoff
December 7, 2017

Ariane 5 Mission with 4 Galileo Satellites set for Dec. 12 Liftoff

UPDATE: Today’s the day. Check back to the Inside GNSS website for updates on today’s launch.

A European Ariane 5 rocket followed dual rail tracks across the Guiana Space Center in South America on Monday on the way to its launch complex Monday, a day before today’s scheduled blastoff with four satellites to expand the Galileo navigation network. Also, you can follow the launch live at Spaceflight.com.

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By Inside GNSS
Army Launches 5-Year PNT Technology R&D Program
November 30, 2017

Army Launches 5-Year PNT Technology R&D Program

The Army is kicking off a wide-ranging, five-year research effort to develop new position, navigation and timing (PNT) technologies for battlefield use.

The goal is to overcome technical barriers in a wide range of areas and military officials are offering to fund multiple, and even multi-phase, cost-plus-fixed-fee (CPFF) efforts to do that. The work may range from studies and analysis to development work that results in the production of a prototype-style deliverable or breadboard and/or a demonstration.

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By Dee Ann Divis
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November 27, 2017

Ligado: Business and Network Plan Remain Unclear

A highly anticipated presentation by Ligado Networks to the nation’s leading satellite navigation experts took an unexpected turn when the company said it could not provide essential network information because it was looking to the government for technical direction and its business plans were still in flux.

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By Dee Ann Divis
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Towards Navigation Safety for Autonomous Cars

Figures 1 – 6, Table 1

There are many good reasons for getting excited about highly automated vehicles, or HAVs, which is the acronym used by the National Highway Traffic Safety Administration (NHTSA). HAVs can make driving more fuel- and time-efficient. They can significantly reduce traffic congestion and emissions by driving a precise speed, minimizing lane changes, and maintaining an exact distance to neighboring cars. They can also increase accessibility and mobility for disabled and elderly persons.

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By Inside GNSS
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