Augmentation & Assistance

Innovation: Getting Closer to Everywhere

October 1, 2013By
FIGURE 1. Functional flow diagrams for a strapdown inertial navigation system (top) and a pedestrian dead-reckoning system (bottom).

Accurately Tracking Smartphones Indoors
If we wish to obtain consistently usable positions indoors using a mobile phone, we can augment its GPS or GNSS receiver with other unfettered sensing technologies such as gyroscopes and accelerometers supplemented by radio signals of opportunity. But is all of this actually feasible? The authors have conducted tests of a multi-system approach to positioning indoors with favorable results. read more

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Registration Opens for Munich Satellite Navigation Summit 2014

September 12, 2013By
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Registration is now open for Munich Satellite Navigation Summit 2014, which will be held March 25-27, 2014, at the Residenz Muenchen in Munich, Germany. The summit will have a booth (Booth H) in the exhibit hall at the ION GNSS+ conference next week in Nashville, Tennessee. The conference is offering a special ION rate for those who register no later... read more

The System: IRNSS Signal Close up

September 1, 2013By and

IRNSS Signal Close up By Richard Langley, Steffen Thoelert, and Michael Meurer The spectrum of signals from IRNSS-1A, the first satellite in the Indian Regional Navigation Satellite System, as recorded by German Aerospace Center researchers in late July, appears to be consistent with a combination of BPSK(1) and BOC(5,2) modulation. Figure 1 shows that, centered at 1176.45 MHz, the signal... read more

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Out in Front: A Star Is Born

August 1, 2013By

Welcome to the club, India, and happy Birth Day. With the July 1 launch of IRNSS-1A, India and the Indian Regional Navigation Satellite System have officially joined the GNSSS (Global Navigation Satellite Systems Society). With full membership, however, come some society duties and responsibilities. Chief and first among these is to provide all other society members and interested parties with... read more

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Indian Regional Navigation Satellite Starts Signal Transmissions

July 25, 2013By
FIGURE 2. IQ constellation diagram of IRNSS-1A L5 signal.

By Richard B. Langley Update (July 29, 2013): The spectrum recorded by the German Aerospace Center researchers appears to be consistent with a combination of BPSK(1) and BOC(5,2) modulation. This is the signal structure that ISRO announced would be used for IRNSS transmissions in the L-band: “The IRNSS signals consist of two special services namely Standard Positioning Service (SPS) and... read more

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IRNSS-1A Reaches Preliminary Destination Orbit

July 11, 2013By

News courtesy of CANSPACE listserv. Following the July 1 launch of the Indian Regional Navigation Satellite System 1A satellite, five orbit maneuvers were to be conducted by the master control facility to position the satellite in its circular inclined geosynchronous orbit (IGSO) with an equator crossing at 55 degrees east longitude. Reports indicate that orbit raising maneuvers have been completed with... read more

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Experts Meet to Standardize Satellite Augmentation Systems

July 3, 2013By
The GPS global satellite navigation system has an accuracy of 5–10 m. Across our continent that accuracy is greatly sharpened to 1-2 m through the European Geostationary Navigation Overlay Service (EGNOS), an operational precursor to Europe’s coming Galileo global satnav system. EGNOS broadcasts augmented information through a trio of geostationary satellites linked to a network of monitoring ground stations.

More than 30 specialists overseeing the world’s five satellite navigation augmentation systems gathered in Russia last week, planning for a high-performance future with many more navigation satellites in orbit, reports the European Space Agency. The Satellite-Based Augmentation Systems (SBAS) Interoperability Working Group was hosted June 25–27 in St. Petersburg by Russia’s Roscosmos space agency and the Russian Academy of Sciences.... read more

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India Launches First Navigation Satellite

July 1, 2013By
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News courtesy of CANSPACE Listserv. The first satellite of the Indian Regional Navigation Satellite System (IRNSS) was successfully launched today. The launch of IRNSS-1A occurred on schedule at is scheduled for 18:13 UTC from the spaceport of Sriharikota. Liftoff from the first launch pad at the Satish Dhawan Space Centre occurred on schedule at 18:11 UTC. The 1,425-kg satellite was launched... read more

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