high precision positioning Archives - Page 3 of 9 - Inside GNSS

high precision positioning

March 15, 2012

Coarse Time Positioning

Q: What is Coarse Time Positioning and how does it work?  

A: Coarse time positioning is used to provide a position fix using inaccurate time information when tracking sufficiently weak GNSS signals such that the navigation message cannot be extracted reliably. This article presents the key aspects of coarse positioning, including some of its challenges. To start, however, we begin by looking at the role of time within a GNSS receiver. 

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By Inside GNSS

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
January 16, 2012

Hexagon 2012

A number of user conferences for customers of Hexagon AB’s precise measurement brands and products will be combined in the Swedish corporation’s second international conference this summer.

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By Inside GNSS
November 30, 2011

LightSquared Postpones International Expansion Effort

A GPS app on a Japanese smartphone. The GPS Council there told the FCC that any signal degradation could jeopardize the Global Positioning System’s standing as a global standard.

LightSquared has dropped, for now, efforts to expand its wireless broadband plans to markets in other countries, Inside GNSS has learned.

The Virginia firm was working this summer on proposals to the International Telecommunication Union, including one aimed at addressing compatibility issues between ground stations or “complementary ground components” of mobile satellite services and other frequency-using services.

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By Inside GNSS
November 16, 2011

Staying In Lane

Next-generation car navigation may well require the ability to identify the lane in which a vehicle is operating on a motorway. This could support advanced driver assistance in general as well as the observation and study of driver behavior and traffic flow. Such road vehicle applications call for sub-meter positioning accuracy, often in real-time — all this preferably at low-cost.

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By Inside GNSS
September 14, 2011

Locata Passes USAF CDR, Technology Adopted by Leica, Launches at ION GNSS 2011

Leica’s Jigsaw Positioning System with LocataLite

Locata Corporation and the U.S. Air Force have announced that the Australia-based company has successfully completed the critical Design Review (CDR) contract phase for a Locata network that will enable the U.S. Air Force to deploy a new ground-based, centimeter-accurate "truth-reference level" positioning system for use in GPS-denied environments.

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By Inside GNSS
September 8, 2011

Everywhere Navigation

Consumer demand for positioning information is currently being met by a plethora of wireless positioning technologies. The most popular consumer positioning technology, GNSS, is only one option along with several methods that use cellular networks to provide location, such as wireless local area networks (WLANs), wireless personal area networks (WPANs), radio frequency identification (RFID) tags, and ultrawideband (UWB) communications.

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By Inside GNSS
August 1, 2011

Australian Satellite Navigation and Positioning Lab Founder to Head IAG

Chris Rizos

The founder of Australia’s largest concentration of GNSS research and development efforts has been named head of the International Association of Geodesy, part of the International Union of Geodesy and Geophysics (IUGG) 

Chris Rizos put together the Satellite Navigation and Positioning laboratory (SNAP) at the University of New South Wales in the 1990s.  He has been researching and writing about high precision technology and applications of GNSS since 1985 and is a professor and head of the surveying and spatial information school at the university.

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By Inside GNSS
July 11, 2011

China Satellite Conference 2011

Hotel Nikko New Century in Haidian, Beijing

This officially sanctioned conference and equipment exhibtion addresses applications, technologies and trends for China’s satellite communications, broadcasting, remote sensing, navigation and positioning.It will be held at Hotel Nikko New Century in Beijing on October 26.28, 2011.

Subjects of most interest to Inside GNSS readers include:

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By Inside GNSS
July 2, 2011

Cars on the Road!

FIGURE 1: System architecture

Cooperative vehicle safety applications should preferably have two-meter horizontal accuracy and six-meter vertical accuracy, all with a 95-percent availability. The solution must be developed to incorporate lower-cost sensor options, specifically, lower-cost inertial measurement units that can be generally characterized by the gyro drift of 100 degrees per hour and an accelerometer bias force of twice its mass times gravity (two milligals).

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By Inside GNSS
June 30, 2011

USA Challenge Competition Seeks Satellite Navigation Apps

This is a 1993 photo of Walter, a German astronaut. He exemplifies the fearless approach to experimentation and the spirit of fun that we are looking for (DLR photo)

[Updated June 30] Lucky you – you have three extra days to submit your GNSS application idea to the USA Challenge! The extended deadline is midnight Sunday (Europe) or 3 P.M. (Pacific time) on July 3.

Right now, some team is hard at work in a basement, an office, a dorm room or a lab. They are about to come up with a new, useful and commercially viable idea for a satellite navigation application or location based service.

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By Inside GNSS
May 24, 2011

Hemisphere Reports Revenue Jump, Profit for Q1 2011

Steve Koles, president & CEO, Hemisphere GPS

Hemisphere GPS, Inc., has reported revenue growth of 41 percent and a return to profitability in the first quarter of 2011 for the three months ending March 31.

For the quarter, the Calgary, Alberta, Canada–based company generated $21.2 million in total revenues, compared to US$15.1 million in the first quarter of 2010. Revenues from all market segments increased in the first quarter of this year.

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By Inside GNSS