INNOVATION INSIGHTS with Richard Langley By Mojtaba Bahrami and Marek Ziebart A look at how Doppler measurements can be used to smooth noisy code-based pseudoranges to improve the precision of autonomous positioning as well as to improve the availability of single-frequency real-time kinematic posit...
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INNOVATION INSIGHTS with Richard Langley By Yuri Urlichich, Valeriy Subbotin, Grigory Stupak, Vyacheslav Dvorkin, Alexander Povalyaev, and Sergey Karutin A team of authors from Russian Space Systems, a key developer of navigation and geospatial technologies in the Russian aerospace industry, describ...
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INNOVATION INSIGHTS with Richard Langley By Alexander Mitelman GNSS RECEIVER TESTING SHOULD NEVER BE LEFT TO CHANCE. Or should it? There are two common approaches to testing GNSS receivers: synthetic and realistic. In synthetic testing, a signal simulator is programmed with specific satellite orbits...
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INNOVATION INSIGHTS with Richard Langley By David W. Affens, Roy Dreibelbis, James E. Mentall, and George Theodorakos In 1997, a Canadian government study determined that an improved search and rescue system would be one based on medium-Earth orbit satellites, which can provide full global coverage,...
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By David A. Hall Is there a way to perform repeatable tests on GNSS receivers using real signals? This month’s column looks at how to use an RF vector signal analyzer to digitize and record live signals, and then play them back to a GNSS receiver with an RF vector signal generator. INNOVATION INSI...
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INNOVATION INSIGHTS with Richard Langley By Alejandro Egido and Marco Caparrini WHY IS THE SKY BLUE? This is an age-old question, interesting to anyone with a curiosity about his or her surroundings. But what has it got to do with global navigation satellite systems? Believe it or not, there is a co...
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By Matthias Söllner, Christian Kurzhals, Wolfgang Kogler, Stefan Erker, Steffen Thölert , Michael Meurer, Maktar Malik, and Manuela Rapisarda INNOVATION INSIGHTS with Richard Langley THE SECOND GALILEO TEST SATELLITE, GIOVE-B, was launched on April 27, 2008, and began transmitting navigation signa...
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