Cover Story

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March 15, 2012

GNSS Jamming in the Name of Privacy

RF interference (RFI) has been and will continue to be a significant worry for GNSS users. 

Because the signals from GNSS satellites are very weak by the time that user equipment receives and processes them, they are especially vulnerable to RFI. Signals that overlap GNSS frequencies are likely to come from transmitters much closer than the satellites and, consequently, can easily overpower GNSS signals and render them unusable. 

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By Inside GNSS
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SIDEBAR: GNSS Attitude Determination on the Fly

Return to main article: "Winging It"

GNSS technology is used in various ways to find attitude or tra­jectory. The simplest method relies on measuring the velocity of a single receiver and interpreting the direction of that vector as the vehicle’s heading.

This works for applications where a vehicle’s motion is con­strained to only one axis – either absolutely, as with a train, or in the typical case of a car — when being driven responsibly!

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By Inside GNSS

SIDEBAR: In-Office Data Processing and Analysis

Return to main article: "Winging It"

With high-quality data sets obtained in the foot-to-foot configu­ration, we set about on postprocessing the data to extract more information about the NovAtel wingsuit system’s performance in the free-fall environment.

This was a multi-step process involving several NovAtel utilities and techniques, which we will describe here.

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By Inside GNSS
January 13, 2012

Winging It

»NovAtel Inc. wingsuit video

In 1589, at the age of 25, Galileo Galilei toiled up the 294 steps of a 55-meter bell tower in Pisa, Italy, where he was tutoring math students at the time.

According to his pupil and later biog­rapher, Vincenzo Viviani, Galileo carried with him two cannonballs, one twice the weight of the other. When he reached the top of the tower, he went to the lower balcony of the tilted structure and dropped the two balls simultaneously.

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By Inside GNSS
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