Signal Processing

Tallysman GNSS Antennas Optimized for Multi-Constellation Systems

April 20, 2015By

Tallysman, a provider of high-performance, high-quality RF and GNSS components, has announced that its range of antennas featuring proprietary Accutenna technology is optimized for today’s multi-constellation satellite systems, including Europe’s Galileo, China’s next-generation BeiDou, GPS, GLONASS and India’s IRNSS. Tallysman’s compact GNSS antenna range with Accutenna technology is future-proof: GNSS is changing, and an increasing number of receivers are capable of... read more

Expert Advice: The Impact of RFI on GNSS Receivers

April 1, 2015By
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By Fabio Dovis When subjected to very strong interference, a GNSS receiver can be totally blinded and stop working. This is often the scope of intentional jammers. However, in a number of cases the presence of interference is severe enough to significantly decrease receiver performance, but not so much as to make the receiver lose its lock on the satellite signals... read more

Russian Company Credo-Dialogue Releases GNSS Software

March 18, 2015By

The Russian company Credo-Dialogue has released Credo GNSS 1.0, a GNSS processing software. Credo GNSS 1.0 is designed for processing of satellite geodetic measurements in differential mode. In this mode, the simultaneous operation of two or more receivers forms the baseline. The input can use the following types of data: satellite geodetic measurements and ephemeris format RINEX (2.0-3.2); satellite geodetic measurements and ephemeris formats... read more

New Version of GAPS PPP Software Available

March 10, 2015By

A new version of the online GAPS precise point positioning software is now available. GAPS — GPS Analysis and Positioning Software — is offered by the University of New Brunswick Geodesy and Geomatics Engineering Department. The latest release provides capabilities for handling GPS data files in both RINEX 2 and 3 formats, whether Hatanaka-compressed or not, along with a number of receiver raw file formats. Also,... read more

Langley’s Ionosphere Research Focus of CBC Report

March 5, 2015By
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CBC News interviewed GPS World Innovation Editor Richard Langley about his ionosphere interference research project with NASA, reported on earlier this week. Langley, a professor at the University of New Brunswick, is working with the Jet Propulsion Laboratory in California to better understand how the ionosphere is disturbed by a variety of phenomena including solar outbursts and other natural hazards such as... read more

BeiDou Numbering Presents Leap-Second Issue

March 3, 2015By
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During preparation of playback scenarios for the upcoming leap-second event taking place in June, engineers at Racelogic identified a potential pitfall for GNSS engineers. The difficulty arises from the fact that BeiDou uses a different “day number” for the date to apply the leap second, compared with GPS and Galileo. GPS and Galileo use 1-7 as week day numbers, and... read more

Study of Atmospheric ‘Froth’ May Help GPS Communications

February 26, 2015By
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GPS World Innovation editor Richard Langley has co-authored a study, described below, exploring how irregularities in Earth’s upper atmosphere can distort GPS signals, an important step toward mitigation. read more

GATE Facility Recertified as Galileo Test Bed

February 11, 2015By

The German Galileo test and development infrastructure GATE has been recertified to serve as a Galileo open‐air test laboratory, for receiver integrity testing (RAIM) for safety‐of‐life (SoL) applications, and for Galileo SIS ICD conformance of signal characteristics and signal quality. The GATE facility, in Berchtesgaden, is operated by IFEN GmbH. Certification was conducted by TÜV SÜD, an international service corporation... read more