TAG: GNSS signals

Anomalous GPS signals reported from SVN49

June 6, 2017By

Researchers at the Politecnico di Torino university detected spikes in the L1 signal spectrum. The origin of the spikes was identified as the transmission of a non-standard code from a non-operational GPS satellite. This story reports on signal observations performed to identify the source of the interference and the impact it could have on GNSS signal processing. read more

Galileo signal team nominated for invention award

June 2, 2017By

The engineering team behind the signal technology underpinning Europe’s Galileo satellite navigation system has reached the final of this year’s European Inventor Award, run by the European Patent Office, reported the European Space Agency. The team is led by Spanish engineer José Ángel Ávila Rodríguez — now part of ESA’s Galileo team — and his French colleague Laurent Lestarquit from France’s... read more

Expert Opinions: Optimum number of GNSS signals for PNT device

February 22, 2016By

Q: What is the optimum number of GNSS signals to include/process in a consumer-grade PNT device? A: The cost for including additional silicon to a receiver for processing more signals is low, thanks to multiplexing hardware and high clock speeds. Having more satellite measurements allows the receiver to be selective about which ones it actually uses for PVT calculations, so... read more

This article is tagged with , and posted in From the Magazine, GNSS, Opinions

High-Precision Receiver Design: More than Accuracy

September 2, 2015By

Users in emerging applications may have different requirements from traditional high-precision users. Tracking all of the new multi-GNSS signals, and then using the large number of inputs in the positioning engine, drives the amount of processing power and memory required onboard the receiver. These in turn drive the cost, size and power consumption of the receiver in exactly the opposite direction from the expectations of customers. read more

A Satellite with Personality

August 7, 2015By

Chip Transition-Edge Based Signal Tracking for Ultra-Precise GNSS Monitoring Applications
This novel concept of monitoring chip asymmetry can extend the state of the art in the areas of GNSS signal-quality monitoring and authentication. Tracking GNSS signals using their underlying spreading sequence chip transition edges reveals positive versus negative chip asymmetries that are characteristic to each satellite. This asymmetry is due to various types of natural signal deformation that is known to occur within the satellite’s signal generation and transmission hardware. read more

Signal Quality of Galileo, BeiDou

September 1, 2013By

Future positioning and navigation applications of modernizing and newly established GNSSs will require a higher degree of signal accuracy and precision. Thus, rigorous and detailed analysis of the signal quality of recently launched satellites, including the discovery of any possible imperfections in their performance, will have important implications for future users. read more

This article is tagged with , , , , and posted in From the Magazine, GNSS, OEM

GNSS and Radio Astronomical Observations

August 1, 2013By

An alternative tool for detecting underground nuclear explosions? By Dorota A. Grejner-Brzezinska, Jihye Park, Joseph Helmboldt,  Ralph R. B. von Frese, Thomas Wilson, and Jade Morton Well-concealed underground nuclear explosions may go undetected by International Monitoring System sensors. An independent technique of detection and verification may be offered by GPS-based analysis of local traveling ionospheric disturbances excited by an explosion.... read more