Inside GNSS Media & Research

NOV-DEC 2018

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Page 32 of 59 N O V E M B E R / D E C E M B E R 2 0 1 8 InsideGNSS 33 In general, state of the art snapshot receiver oers system designers a lot of exibilities to tailor make a low power and low cost GNSS solution that is most suitable for their hardware implementation and use cases. •is is fundamentally dierent from the conventional GNSS chipset that most designers are accustomed to. In addition to the three con•gura- tion modes described above, to mini- mize energy further, designers can force the snapshot receiver to remain in a "deep sleep" state most of the time. •e receiver will only wake up for a few milliseconds to periodically capture a user's position, store the captured signal and then go back to a "deep sleep" state to conserve power. •is essentially creates a GPS-on-demand operating mode. Internet-connected smartphones have created an "always ON" world that has us conditioned to expect everything to be ON instantly. •e penalty for using conventional GNSS receivers to satisfy our "instant every- thing" desire is the signi•cant energy consumption. In contrast, snapshot receiver technology operates counter- intuitively by forcing the receiver to be always OFF to conserve this pre- cious energy; it uses advanced signal processing techniques that require the receiver to be turned ON just for a few milliseconds. For low-power Wearables and IoT applications where position •xes are needed but energy consump- tion must be kept to a minimum, a snapshot receiver is ideal. Additional Resources For additional information about snapshot based receivers and posi- tioning, please refer to the following resources [1] "System, Method, and Computer Program for a Low Power and Low Cost GNSS Receiver", United States Patent US 9,116,234 B2. [2] Muthuraman, K., (2012) Coarse Time Position- ing. Inside GNSS, March/April 2012 [3] van Diggelen, F., (2009) A-GPS: Assisted GPS, GNSS, and SBAS, Artech House, 'rst edition Authors KEITH VAN DIERENDONCK is a Sr. GNSS Specialist at Baseband Technologies, Inc. in Calgary, Alberta, Canada. Keith has worked in GNSS system development ranging from high-precision to low-cost/low-power for more than 25 years. OSSAMA AL-FANEK is a Sr. GNSS Engineer at Baseband Technologies, Inc. in Calgary, Alberta, Canada. Ossama received a PhD degree in Geomatics Engineering at the University of Calgary and has been working on low-power GNSS system development for the past 8 years. MARK PETOVELLO, co-author, is the editor of this column. See all configurations and schedule a demo at PCIe-Based System Create complex simulation scenarios that integrate multiple constellations, multiple frequencies, dynamic interferences and much more. SDX combines GPU-accelerated computing and COTS hardware into a truly flexible and complete simulator, available in a wide range of configurations and deployment options to meet any simulation need. NEW CDM-5 Clock Distribution Module Distributed 1PPS and 10MHz Signals in PCIe format NAVWAR: Talen-X BroadSim and BroadSim Anechoic

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