Signal Processing

GNSS Test Standards for Cellular Location

May 1, 2013By
Downtown Seattle, a typical test-case environment.

GNSS receivers in cell phones will soon support four or more satellite constellations and derive additional location measurements from other sources: cellular location, MEMS sensors, Wi-Fi, and others. The authors propose test standards covering these sources, meeting industry requirements for repeatable testing while considering the user experience. read more

This article is tagged with and posted in From the Magazine, LBS/Wireless, Signal Processing, Wireless Infrastructure

PLAN Group Tracks Galileo Satellites for Positioning in Canada

March 15, 2013By

by James T. Curran, Mark Petovello, and Gérard Lachapelle Within a day of their initial activation over central Europe on March 12, Galileo satellites were visible over North America. The PLAN Group of the University of Calgary was successful in capturing and processing the signals from these satellites as they emerged. Galileo PRN 11, 12, and 19 were found and... read more

Anti-Jam Protection by Antenna

February 1, 2013By
Figure 6. Outdoor jamming test campaign.

A controlled radiated pattern antenna can be an effective way to protect GPS receivers against jamming. A new CRPA, composed of seven elements, works on the E5a, E5b, E6, L2, and L1 bandwidths. This article reports on radiation pattern measurements of the array in a test facility. read more

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

Signal Decoding with Conventional Receiver and Antenna

February 1, 2013By
Figure 7  Signal-to-noise-density ratio of E1 (red), E5a (magenta), E5b (blue), and E6 (green) code tracking of Galileo IOV satellite PRN 11 on December 21–22, 2012.

A method of decoding an unknown pseudorandom noise code uses a conventional GNSS antenna and receiver with modified firmware. The method was verified using the signals from the Galileo In-Orbit Validation satellites. read more

Call for Participation: Round 2 of NGS Kinematic GPS Challenge

January 30, 2013By

NOAA’s National Geodetic Survey (NGS) is conducting a 12-year project, called Gravity for the Redefinition of the American Vertical Datum (GRAV-D), to redefine the vertical datum of the United States by flying airborne gravity missions. The accuracy of the resulting vertical datum depends directly on the quality of the aircraft’s GNSS position solutions. In August 2010, NGS issued a Kinematic... read more

This article is tagged with and posted in Aviation, GNSS News, Latest News, Signal Processing, Transportation News

Septentrio Demonstrates BeiDou+GPS+GLONASS Positioning

January 9, 2013By
Septentrio_Op

Septentrio announced on January 7 that it has successfully implemented BeiDou support in the company’s high-precision receiver software, taking advantage of the recent official release of BeiDou’s Interface Control Document (ICD) to including the Chinese satellite navigation signals into its position-velocity-time (PVT) solution. According to the Belgian GNSS receiver manufacturer, its engineers “are currently processing further data sets to finalize... read more

JAVAD GNSS Tracks Compass B3 Signals

January 9, 2013By

On December 29, two days after the Compass Interface Control Document (ICD) was made publicly available, JAVAD GNSS announced that it had tracked “B3 signal from all launched Compass satellites, using TRE-G3T-E E6-band capable receiver.  Graphs shows SNR and ‘code-minus-phase’ combination of GEO svn #5 (sat #215 on graph), IGSO svn #8 (sat #218) and MEO svn #14 (sat #224).... read more

This article is tagged with and posted in BeiDou/Compass, GNSS, Latest News, Signal Processing

Galileo E6 Signal Tracking Announced by JAVAD GNSS

January 2, 2013By

An announcement on the JAVAD GNSS website states “On December 21, 2012, we have tracked E6 B/C signal from all launched Galileo satellites, using TRE-G3T-E E6-band capable receiver. “The following graphs shows SNR and ‘code-minus-phase’ combination of svn #11 (sat #81 on graph), svn #12 (sat #82) , svn #19 (sat #89) and svn #20 (sat #90). C/A stands for... read more

This article is tagged with , and posted in Galileo, GNSS, GNSS News, Signal Processing