The stability of a received GPS signal determines how well the receiver can track the signal and the accuracy of the positioning results it provides. While the satellites use a very stable oscillator ...
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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 c...
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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 c...
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By the Satellite-Based Augmentation Systems Ionospheric Working Group INNOVATION INSIGHTS with Richard Langley THE IONOSPHERE. I first became aware of its existence when I was 14. I had received a sho...
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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 ...
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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...
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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 ...
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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- dor...
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