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Survey and Mapping

TRANSNAV 2013: Marine Navigation and Safety of Sea Transportation
May 23, 2012

TRANSNAV 2013: Marine Navigation and Safety of Sea Transportation

Transnav 2011

The 10th TRANSNAV symposium will be held June 19-21, 2013 at Gdynia, Poland, a seaport and resort city on the south coast of the Baltic.

The biennial event is an opportunity for scientists and professionals in navigation, transport, ocean engineering and maritime technology to share knowledge and research on all aspects of maritime navigation and safety of sea transportation. The symposium is held in English.

The organizers expect 300 participants from 50 countries or more.

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By Inside GNSS
Trimble to Acquire SketchUp — Google 3D Modeling Tool
April 26, 2012

Trimble to Acquire SketchUp — Google 3D Modeling Tool

Example of site logistic design by M.A. Mortenson Company using Google’s SketchUp 3D modeling tool

Trimble announced plans today (April 26, 2012) to acquire SketchUp, a popular 3D modeling tools, from its Silicon Valley neighbor, Google, Inc.

Sunnyvale, California–based Trimble signed a definitive agreement with Google, headquartered in Mountain View, with the transaction expected to close in the second quarter of 2012. Although the companies did not disclose financial terms of the deal, a Trimble news release said the transaction “is not expected to be material to 2012 earnings per share.”

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By Inside GNSS
GNSS Modernization
April 3, 2012

GNSS Modernization

Christopher Hegarty

Perhaps for the first time in the nearly 40 years of satellite navigation, all four GNSS programs and regional systems appear to have firm — if not always unencumbered — development paths ahead of them.

GPS, GLONASS, Galileo, Compass/Bei- Dou, Japan’s MSAS and QZSS, and India’s GAGAN and IRNSS systems are bringing new or modernizing elements into the world. Key program enablers — such things as budgets, satellite construction, launches and launch vehicles, new signal designs — all appear favorably aligned.

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By Inside GNSS
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LightSquared Fallout May Prompt Push for GPS Receiver Standards
March 29, 2012

LightSquared Fallout May Prompt Push for GPS Receiver Standards

The firefight between LightSquared and the GPS community has sparked regulatory brush fires around Washington with the Federal Communications Commission  (FCC), Congress, a half dozen executive agencies, and numerous companies moving to address a new and likely larger battle over receiver standards, radio frequency spectrum efficiency, and RF spectrum protection.

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By Dee Ann Divis
GPS Dot Hanks image.jpg
March 15, 2012

The GPS Dot and its Discontents

In-home construction of the first civilian-owned civil GPS spoofer.

Over the last few years, several of us in the GNSS community have done our best to convince our colleagues, policymakers, and the general public that unsavory characters with GNSS jammers or spoofers are a genuine threat to GNSS and an orderly society.

"But who would want to use a jammer or spoofer?” people ask.

My response? Hackers, because they can. Thieves planning to snatch expensive cargo. A moonlighting employee in the company car. Worse yet, state actors or terrorists targeting our national infrastructure.

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By Inside GNSS
One-Centimeter Accuracy with PPP

One-Centimeter Accuracy with PPP

The navigation message has always been considered an inherent and essential feature of a global satellite navigation system. Its primary objective is to provide receivers with information on the errors of satellite clocks and parameters to compute the positions of satellites, as well as other parameters that help generate more accurate measurements.  

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By Inside GNSS
GPS Program Budget: A Lot, But Is It Enough?
February 29, 2012

GPS Program Budget: A Lot, But Is It Enough?

The details of President Obama’s 2013 budget have been gradually filtering out and, in general, the GPS system and those programs closely linked to satellite navigation, have escaped deep cuts.

On the hardware side the White House has requested $58.2 for GPS IIF satellite procurement. According to Air Force budget documents, the plan is to then wrap up the total IIF procurement of 12 satellites with a request for $77.6 million in FY14 and $7.3 million in FY15.

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By Inside GNSS
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SIDEBAR: GNSS Attitude Determination on the Fly
January 24, 2012

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

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
FIG /IAG Technical Seminar: Reference Frame in Practice
January 16, 2012

FIG /IAG Technical Seminar: Reference Frame in Practice

Monte Mario, the highest hill in Rome

A special seminar for geodesists will take place in Rome, Italy on May 4 and 5, just before the 35th FIG general assembly and working week.

The conference venue is the Cavalieri hotel on Monte Mario near the Vatican.

It is organized by the International Association of Geodesy (IAG), the surveyors’ international association (FIG) and the UN’s International Committee on GNSS (ICG).

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By Inside GNSS
Network RTK and Reference Station Configuration
November 16, 2011

Network RTK and Reference Station Configuration

Q: What effect does network size have on NRTK positioning?

A: Network real-time kinematic (NRTK) positioning is nowadays a very common practice, not only in academia but also in the professional world. In the last 10 years, several networks of continuous operating reference stations (CORSs) were created to support users. These networks offer real-time services for NRTK positioning, providing centimeter-level positioning accuracy with an average distance of 25–35 kilometers between the reference stations.

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By Inside GNSS
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