A Calibrated Precision GNSS Simulator for Timing Applications

Download Whitepaper
  • Author: Lisa Perdue
Testing GNSS receivers specifically for timing applications to determine the accuracy of the receiver’s 1PPS output presents challenges in measuring accuracy to sub nanosecond levels. Using the live sky signals as a test reference has many problems. It has been shown that receiver biases vary at different frequency bands because of varying group delay in the RF circuitry: Biases vary across different GNSS signal types because of the different modulation, various decoding techniques and different correlator sizes, and biases even vary from satellite to satellite for the same signal type because of different transmitter characteristics. Moreover, changing atmospherics over time makes the live sky signals a poor reference for repeatable tests. For all of these reasons, it is desirable to use a GNSS simulator to generate the various constellation signals in a repeatable, reliable fashion.
Please note: By downloading a white paper, the details of your profile might be shared with the creator of the content and you may be contacted by them directly.