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September 19, 2012

China Launches Two More Compass/BeiDou-2 Spacecraft

China successfully launched another two Compass/BeiDou satellites into space at 3:10 a.m. Beijing time on Wednesday (September 19, 2012), according to the Chinese state news agency Xinhua.

They were the 14th and 15th satellites for the nation’s GNSS system, and presumably the fourth and fifth middle-Earth-orbiting (MEO) satellites in the constellation. The satellites, launched from the Xichang Satellite Launch Center in southwest China’s Sichuan Province, were boosted by a Long March-3B carrier rocket.

By Inside GNSS

September 13, 2012

746th Test Squadron’s Paul Benshoof Joins Locata Corporation

Paul Benshoof

Locata Corporation has announced that U.S. Air Force (USAF) veteran Paul Benshoof, formerly chief of strategic development at the 746th Test Squadron (746TS) at Holloman Air Force Base, New Mexico, has joined the company as global business development manager for military and government applications in the United States and abroad.

By Inside GNSS

September 12, 2012

2012 Trimble International User Conference

Trimble Dimensions, the 2012 International User Conference, will take place at the Mirage Hotel in Las Vegas, Nevada from November 5 to 7.

Early-bird pricing has been extended to September 14.

The annual event targets surveying, engineering, construction, mapping, GIS, geospatial, infrastructure, utilities and field service management professionals who use positioning products developed and sold by Trimble companies. The companies include: Accubid, Applanix, Meridian Systems, OmniStar, Pacific Crest, PeopleNet, Plancal, QuickPen and Tekla.

By Inside GNSS

September 11, 2012

GPS, Galileo Launches Near; GSA Opens Prague Office

The U.S. and European GNSS programs will launch satellites within a week of each other next month.

A GPS Block IIF satellite is scheduled to be lifted into space on October 4 and a second pair of Galileo in-orbit validation (IOV) satellites, on October 10.

Meanwhile, the European GNSS Agency (GSA) opened its new office in Prague, Czech Republic, last Thursday (September 6, 2012).

By Inside GNSS

September 7, 2012

CSNC 2013: China Satellite Navigation Conference

"BeiDou Applications – Opportunities and Challenges" is the subject of the 2013 China Satellite Navigation Conference to be held in Wuhan, China on May 15, 16 and 17, 2013.The event will be held at the Wuhan International Conference & Exhibition Center (696 Jiefang Road, Hankou, Wuhan, China).

It is sponsored by the China Satellite Navigation Office and a number of other official PRC agencies.

The official language of the conference is Chinese with simultaneous English translation.

By Inside GNSS

Lockheed, Raytheon Complete First GPS III Launch Exercise

Raytheon Company and Lockheed Martin have successfully completed the first launch readiness exercise for the U.S. Air Force’s next-generation GPS III satellites.

By Inside GNSS

September 3, 2012

Vector Delay Lock Loops

GNSS receivers determine their position and clock bias by measuring the arrival times of satellite signals. Delay lock loops (DLLs) are used in traditional receivers to measure the arrival times of the signals.

By Inside GNSS

GPS Civil Funding

The Federal Aviation Administration (FAA) has told those awaiting their slice of the GPS civil program budget that the funds are on the way.

The money, which is supposed to support that portion of the GPS program springing from the needs of civilian users, has been held up for months. In fact, as of late August — with less than 40 days left to go in the fiscal year — the money had not been transferred to either the military’s GPS Directorate or the National Coordination Office (NCO) for Space-Based Positioning, Navigation, and Timing (PNT).

By Dee Ann Divis

Exploiting the Galileo E5 Wideband Signal

Equation 1

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

Genene Fisher: Bringing Space Science Down to Earth

SIDEBAR: Genene Fisher’s Compass Points

As Solar Cycle 24 rolls around toward its maximum peak next May, when a hundred or more sunspots may appear during the course of a single day, no single navigator stands at the helm to guide the hundreds of companies, research groups, users, and policy workers through the uncharted realm of spiking solar activity and its inevitable effects on GNSS.

By Inside GNSS

Improving GNSS Attitude Determination

This article describes an integration of a single-frequency GNSS, two-antenna heading system with low-cost inertial and magnetic field sensors in order to improve the availability and reliability of pure GNSS attitude determination. This method calculates a redundant attitude solution in an error-state Kalman filter using different sensor setups. As a result, the process of carrier phase ambiguity resolution accelerates.

By Inside GNSS

Spoofs, Proofs & Jamming

TABLE 1. Spoofer antenna requirements for various hardened GPS signal types

“Here is Edward Bear, coming downstairs now, bump, bump, bump, on the back of his head, behind Christopher Robin. It is, as far as he knows, the only way of coming downstairs, but sometimes he feels that there really is another way, if only he could stop bumping for a moment and think of it. And then he feels that perhaps there isn’t.”
– A.A. Milne, Winnie-the-Pooh

Is our faith in the integrity and infallibility of the Global Positioning System misplaced or, perhaps, insufficiently grounded?

By Inside GNSS

ESA GNSS Propagation Course 2012

El Centro Europeo de Astronomía Espacial (ESAC)

Organized by the European Space Agency with the collaboration of a number of national space organizations, this intensive course will cover GNSS error sources related to radiowave propagation and interference effects.

It is aimed at engineers, geodesists, physicists and advanced students with appropriate degrees and a knowledge of GNSS fundamentals, statistics and signal processing.

By Inside GNSS

Main Categories

NextGen Equipage Fund Takes Off While FAA Works to Cut Program De...

What’s Happening at ION GNSS 2012...

China Launches Two More Compass/BeiDou-2 Spacecraft

746th Test Squadron’s Paul Benshoof Joins Locata Corporation

2012 Trimble International User Conference

GPS, Galileo Launches Near; GSA Opens Prague Office

CSNC 2013: China Satellite Navigation Conference

Lockheed, Raytheon Complete First GPS III Launch Exercise

Vector Delay Lock Loops

GPS Civil Funding

Exploiting the Galileo E5 Wideband Signal

Genene Fisher: Bringing Space Science Down to Earth

Improving GNSS Attitude Determination

Spoofs, Proofs & Jamming

ESA GNSS Propagation Course 2012