By Nicholas Othieno and Scott Gleason INNOVATION INSIGHTS with Richard Langley BEFORE GPS, THERE WAS TRANSIT. Also known as the U.S. Navy Navigation Satellite System, Transit was the world’s first satellite-based positioning system. It was declared operational in 1968 although it had been...
Read More →
By Mark Caissy, Loukis Agrotis, Georg Weber, Manuel Hernandez-Pajares, and Urs Hugentobler The International GNSS Service has embarked on a project to provide a high-accuracy GPS satellite orbit and clock data service in real time. The service will also provide 1-Hz data streams of GPS and GLONASS d...
Read More →
GNSS signal simulators can be expensive and beyond the limited budgets of many researchers. In this month’s column, we look at one company’s approach to providing GNSS signal simulation at a low cost — one that virtually any researcher can afford. By Alison Brown, Jarrett Redd, and Mark-Anthon...
Read More →
INNOVATION INSIGHTS with Richard Langley By Jared B. Bancroft, Valérie Renaudin, Aiden Morrison, and Gérard Lachapelle GPS IS VIRTUALLY UBIQUITOUS with more than 400 million units estimated to be in use in the United States alone. Some of these units are standalone devices such as those used in ...
Read More →
By Ryan H. Mitch, Ryan C. Dougherty, Mark L. Psiaki, Steven P. Powell, Brady W. O’Hanlon, Jahshan A. Bhatti, and Todd E. Humphreys GPS jamming is a continuing threat. A detailed understanding of how the available jammers work is necessary to judge their effectiveness and limitations. A team of res...
Read More →
By Liang Heng, Grace Xingxin Gao, Todd Walter, and Per Enge There are four important requirements of any navigation system: accuracy, availability, continuity, and integrity. In this month’s column we take a look at one particular aspect of GPS integrity: that of the signal in space and find out h...
Read More →
INNOVATION INSIGHTS with Richard Langley THREE, TWO, ONE, ZERO! Can you still navigate with just a GPS receiver when the number of tracked GPS satellites drops from four to none? As we know, pseu- doranges from a minimum of four satellites, preferably well spaced out in the sky, are required for thr...
Read More →
Performance of Multiplexed Binary Offset Carrier Modulations for Modernized GNSS Systems By E. Simona Lohan, Mohammad Z. H. Bhuiyan, and Heikki Hurskainen A candidate for modernized GNSS civil signals in the L1/E1 band was BOC(1,1), a binary-offset-carrier signal with a “split spectrum” ...
Read More →