Q: Can you list all the properties of the carrier-smoothing filter?
A: Carrier-smoothing filters, also known as Hatch filters, are commonly used to reduce (“smooth”) the noise and multipath errors in pseudorange measurements by exploiting the high-precision relative distance information from carrier phase measurements. However, carrier-smoothing filters operate on more than just noise and multipath, and this article summarizes the response of such filters to all relevant inputs.
By Inside GNSSThe U.S. stance on satellite navigation has long supported international cooperation and a degree of interoperability. In 2010 the Obama administration even adopted a space policy that said foreign satnav services could be used “to augment and strengthen the resiliency of GPS.”
That was easier in the abstract, however, when the only fully functional GNSS was GPS. Now, with other GNSS services coming online, American officials want to think things through again.
By Dee Ann DivisReporting from Brussels last year, we explained that the then–brand new EU GNSS Regulation had effectively put to bed years of wrangling over who does what in Europe’s GNSS programs. But the issue reared its head again in Brussels recently, in a highly charged discussion hosted by the European Economic and Social Committee (EESC).
By Peter GutierrezThe 2015 symposium of the Asia-Pacific Space Geodynamics (ASPG) project will focus on Geodesic Datum and Regional and Terrestrial Reference Frame Realizations. It will take place at the Russian Academy of Sciences in Moscow, Russia from August 24 through August 28.
The conference language will be English. Scientific representatives from China and Russia comprise the organizing and program committees.
Themes of particular interest to Inside GNSS readers include presentations on:
Theme 1 Space geodesy
By Inside GNSSThe tenth meeting of the International Committee on GNSS (ICG) will take place in Boulder, Colorado from November 1 through 6 2015. It will be hosted by the United States and organized by University Corporation for Atmospheric Research (UCAR) on behalf of the U.S. State Department.
It will take place at UCAR headquarters on the Center Green Campus in Boulder.
By Inside GNSSThe 5th International School on Satellite Navigation will take place in the GLONASS Learning Centre in Moscow, Russia from September 14-24.
The event is organized by Roscosmos and JSC Russian Space Systems.
Lectures and hands-on studies cover the history,current status and future applications of GLONASS and GPS. It includes theoreticaf lectures and practical exercises. The first covers satellite navigation fundamentals and the second the combined use of Earth Remote Sensing and GNSS data in specific sectors of the economy.
By Inside GNSSIPIN 2015 will take place October 13-16 at the Banff Centre, a conference center and school for the arts location in the Rocky Mountain resort town of Banff, a 90 minute drive west of Alberta, Canada.
The indoor postioning and indoor navigation conference includes experts in electronics, surveying and informatics who will discuss this key issue in many emerging applications.
By Inside GNSSInside GNSS editor and publisher Glen Gibbons has received a high honor from the United Kingdom’s Royal Institute of Navigation (RIN) for his "outstanding contribution to navigation" as a journalist and publisher.
The 2015 Harold Spencer-Jones Gold Medal was presented to Gibbons by Prince Philip, Duke of Edinburgh and husband of Queen Elizabeth II, on July 15 at the Royal Geographical Society in London. The duke is the patron of the institute.
By Inside GNSSThe availability of several GNSSes promises advanced positioning, navigation, and timing services with higher availability and improved accuracy. According to a European GNSS Agency (GSA) market study, nearly 60 percent of receivers, chipsets, and modules already support at least two GNSS constellations, showing that multi-constellation is becoming a standard feature across all market segments. That development brings up questions of law and regulation that require careful handling by GNSS manufacturers, service providers, and policy makers.
By Ingo BaumannA few studies (by universities and industry) have shown the feasibility of simulation of real-time digital intermediate frequency (IF) signals based on a graphics processor unit (GPU). And a couple of articles have also demonstrated use of a universal software radio peripheral (USRP)–based software-defined radio (SDR) as a simulator (in playback mode) in real test environments.
By Inside GNSSThe 16th International Symposium On GNSS 2015 will be held November 16 – 19, 2015 at Miyakomesse in Kyoto, Japan.
ISGNSS 2015 will be co-located with the Asia and Pacific Rim meeting of the CGIC (Civil GPS Service Interface Committee) to help improve understanding of the world trends in developing and deploying GNSS. The program will include keynote addresses, oral presentations, interactive poster sessions, panel sessions, open interactive forums and a trade exhibition.
By Inside GNSSThe fifth international colloquium on scientific and fundamental aspects of the Galileo program will take place at the Physikalisch-Technische Bundesanstalt (PTB) in Braunschweig, Germany from October 27 – 29, 2015.
Early registration ends September 17, 2015. Abstract submission has ended.
By Inside GNSS