Tri-Band Inter-Frequency Group Delay Calibration

Matthew Strong, Jackson Miller, Nathan Green

Abstract:	Abstract—Triple Frequency Reference Station (TFRS) is developing circuitry and associated firmware to produce a phase-coherent signal across the L1, L2, and L5 frequency bands for calibration of triple-frequency, high-accuracy GPS receivers. As an undergraduate project, TFRS aims to assist in the calibration of ionospheric biases by enabling on-demand calibration of receivers as environmental or external factors change. The signal is generated by a Complex Programmable Logic Device (CPLD) and upconverted by three-stages of mixers, placing phase-coherent, GNSS-like signals onto L1, L2, and L5. Modifications to the GRID software defined receiver will measure inter-channel biases of the generated signal when processed by a front-end. TFRS hopes to attain a phase-coherence of 100 picoseconds or less and confirm this accuracy with a series of tests culminating in inter-channel bias measurements. Index Terms—Calibration, triple-frequency, coherent, undergraduate research, GNSS
Published in:	2023 IEEE/ION Position, Location and Navigation Symposium (PLANS) April 24 - 27, 2023 Hyatt Regency Hotel Monterey, CA
Pages:	1033 - 1039
Cite this article:	Strong, Matthew, Miller, Jackson, Green, Nathan, "Tri-Band Inter-Frequency Group Delay Calibration," 2023 IEEE/ION Position, Location and Navigation Symposium (PLANS), Monterey, CA, April 2023, pp. 1033-1039. https://doi.org/10.1109/PLANS53410.2023.10140115
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