Main Categories Archives - Page 146 of 243 - Inside GNSS - Global Navigation Satellite Systems Engineering, Policy, and Design

Are there special considerations for dealing with raw GNSS data?

Q: Are there special considerations for dealing with raw GNSS data?

A: Most GNSS users are only interested in position, velocity, and/or time (PVT) information provided by a receiver. In fact, most mass-market GNSS receivers (e.g., those in cell phones or in your vehicle) only provide PVT information along with some supporting data (such as the number of satellites tracked, dilution of precision, course over ground, and so forth).

By Inside GNSS

May 20, 2015

Estimating the Short-Term Stability of In-Orbit GNSS Clocks

Global navigation satellite systems provide position, velocity, and time (PVT) solutions to users whose receivers calculate position based on one-way ranging from satellites. As is well-understood, a key step in the positioning process involves a determination of the difference between the time of signal transmission identified in the satellite’s broadcast navigation message and the time of its reception by user equipment.

By Inside GNSS

Thinking Small

Equations 2, 7, 8, 9, 10 & 11

Unmanned aerial vehicles (UAV) are finding increased application in both domestic and governmental applications. Small UAVs (maximum take off weight less than 20 kilograms) comprise the category of the smallest and lightest platforms that also fly at lower altitudes (under less than 150 meters).

Designs for this class of device have focused on creating UAVs that can operate in urban canyons or even inside buildings, fly along hallways, and carry listening and recording devices, transmitters, or miniature TV cameras.

By Inside GNSS

Double Phase Estimator

Working Papers explore the technical and scientific themes that underpin GNSS programs and applications. This regular column is coordinated by Prof. Dr.-Ing. Günter Hein, head of Europe’s Galileo Operations and Evolution.

By Inside GNSS

Same Issues, Fierce Debate as LightSquared Bankruptcy Ends; GPS Spectrum Battle Reappears

After three years in Chapter 11, the company whose planned wireless broadband system threatened to overload GPS receivers across the United States is preparing to emerge from bankruptcy.

By Dee Ann Divis

April 29, 2015

Space Situational Awareness (SSA) 2015

College Park Marriott Hotel and Conference Center

The 2015 Space Situational Awareness (SSA) Forum will be held at the College Park Marriott Hotel and Conference Center in Hyattsville, Maryland, U.S.A. on May 12-13, 2015.

By Inside GNSS

March 20, 2015

Flying Blind

It’s 10 p.m. somewhere over the vast oceans that comprise three-quarters of the Earth’s surface. Do you know where your airplane is?

Well, you could, but maybe you don’t.

The anniversary of the disappearance of Malaysia Airlines flight MH370 came and went in March with the fate of the Boeing 777 still unknown.

It didn’t have to happen.

By Inside GNSS

March 14, 2015

Estimating Ionospheric Delay Using GPS/Galileo Signals in the E5 Band

Equations 1 – 4

Working Papers explore the technical and scientific themes that underpin GNSS programs and applications. This regular column is coordinated by Prof. Dr.-Ing. Günter Hein, head of Europe’s Galileo Operations and Evolution.

By Inside GNSS

GNSS and Precision Farming

Dr. John Fulton, Ohio State University

Nowhere has the fact that GNSS can guide things besides military weapons and transport manifested itself more profoundly than in agriculture.

While Google and automotive manufacturers struggle to figure out how to put autonomous vehicles on the highway, farmers have been using GNSS for well over a decade to guide equipment through their fields — along with a host of other ag-related, site-specific applications.

Indeed, GNSS — along with an array of other high-tech resources — is transforming agriculture at an accelerating rate.

By Inside GNSS

How does a GNSS receiver estimate velocity?

Equations 1 – 11

Q: How does a GNSS receiver estimate velocity?

A: Stand-alone single-frequency GNSS receivers represent the largest slice of the commercial positioning market. Such receivers operate mainly in single point position (SPP) mode and estimate velocity either by differencing two consecutive positions (i.e., approximating the derivative of user position) or by using Doppler measurements related to user-satellite motion.

By Inside GNSS

Seriously Seeking a Galileo Service Operator

Carlo des Dorides, El?bieta Bie?kowska

Last January, the European GNSS Agency (GSA) announced a new invitation to tender for the role of Galileo service operator (GSOp). Speaking at the recent EU Space Policy Conference in Brussels, GSA Executive Director Carlo des Dorides called it the largest contract ever to be awarded under the Galileo program.

“It will shape the future of Galileo,” he said.

By Peter Gutierrez

U.S. Nears eLoran Decision with Broad International Implications

Prof. David Last

The U.S. government appears to be closing in on a decision about whether to revive plans for an enhanced Loran (eLoran) system, as a backup for the position, navigation, and timing (PNT) information provided by GPS signals.

By Dee Ann Divis

March 8, 2015

NOAA’s National Geodetic Survey (NGS) Geospatial Summit 2015

Arlington, Virginia

NOAA’s National Geodetic Survey (NGS) Geospatial Summit will be held at the Crystal City Hilton in Arlington, Virginia on April 13-14, 2015.

Registration is now open. Early registration ends March 13, 2015.

NGS will be hosting three events, each one providing a venue for NGS to share information about its products and services as well as hear from its customers across the public and private sectors.

By Inside GNSS

Main Categories

ITS World Congress Highlights GNSS...

Farm Vehicle Automation...

Are there special considerations for dealing with raw GNSS data?

Estimating the Short-Term Stability of In-Orbit GNSS Clocks

Thinking Small

Double Phase Estimator

Same Issues, Fierce Debate as LightSquared Bankruptcy Ends; GPS Spectrum Battle Reappears

Space Situational Awareness (SSA) 2015

Flying Blind

Estimating Ionospheric Delay Using GPS/Galileo Signals in the E5 Band

GNSS and Precision Farming

How does a GNSS receiver estimate velocity?

Seriously Seeking a Galileo Service Operator

U.S. Nears eLoran Decision with Broad International Implications

NOAA’s National Geodetic Survey (NGS) Geospatial Summit 2015