Magazine Department

Cooperative GNSS Authentication
August 29, 2013

Cooperative GNSS Authentication

Equations

During the past two decades, the Global Positioning System, together with other GNSSes, has become an essential element of the global information infrastructure, with myriad applications in almost every facets of modern businesses and lifestyles, including communication, energy distribution, finance and insurance, and transportation. Ever-growing dependence on GNSS creates strong incentives to attack civil GNSS, for either an illegitimate advantage or a terrorism purpose.

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By Inside GNSS
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Location, Location, Location
July 18, 2013

Location, Location, Location

In a part of the world where frustrated drivers will park anywhere, including squarely on a sidewalk, a local newspaper is using location data to shame car owners into shaping up.

The Village, a Russian online publication serving Moscow, St. Petersburg and Kiev; created a free app that notes a badly parked vehicle’s make, color, and license plate information when users snap its picture.

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By Dee Ann Divis
Receiver Architecture
July 17, 2013

Receiver Architecture

Q: What is a maximum likelihood vector tracking receiver?

A: Vector tracking in GNSS receivers is based on the idea that instead of tracking each satellite’s signal separately, all signals are ultimately related to the position and velocity of the user antenna and thus can be tracked collectively. (See the discussion in this column in Sept/Oct 2012 issue of Inside GNSS by Drs. Lashley and Bevly for more information.)

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By Inside GNSS
Phones, Drones and Privacy

Phones, Drones and Privacy

Every breath you take . . .
Every move you make
Every step you take
I’ll be watching you

I originally planned on titling this column, “Waiting to Inhale,” recalling these lyrics and an editorial I wrote more than four years ago about my sense of relief at the departure of the second Bush administration.

I called that one, “Waiting to Exhale.”

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By Inside GNSS
Something Old, Something New

Something Old, Something New

The past 15 years have witnessed tremendous developments of new and modernized satellite-based navigation (satnav) systems, including GNSSs, regional systems, and space-based augmentation systems (SBASs). These have been enabled by the original designs of GPS and GLONASS and, in turn, have stimulated the design of satnav signal structures with different characteristics from those pioneer systems.

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By Inside GNSS
Air Force Proposes Dramatic Redesign for GPS Constellation
June 4, 2013

Air Force Proposes Dramatic Redesign for GPS Constellation

[Updated June 3, 2013] With the budget vise tightening, top Pentagon managers are readying some potentially dramatic changes to the GPS constellation — changes that promise to lower both the cost of the satellites and the expense of putting them into orbit.  

The first changes would be subtle and are linked to buying the next block of GPS III satellites — a decision that sources confirm will be made by the end of September.  

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By Dee Ann Divis
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