Flight Test Results and Multipath Mitigation for Ionosphere-Free, Dual-Frequency Code Noise and Multipath (CNMP) Algorithm on King Air and DC-3 Airframes

D. Bruckner, F. van Graas, T. Skidmore

Abstract:	Flight test results are presented for an ionosphere-free variant of a new dual-frequency differential architecture for aircraft precision approach and landing. Details of this Code Noise and Multipath (CNMP) variant are provided here for the first time in the open literature. Data from Ohio University's King Air C-90 and DC-3 illustrate the differences in performance between the two airframes' contrasting multipath environments and between the two architecture versions, using single frequency, carrier-phase code smoothing as a performance baseline. Results for six approaches by each aircraft to the same runway show divergence-free CNMP performance that reduces position error by 25% to 50% and protection levels (PLs) by two-thirds over a single frequency, carrier-smoothed code architecture. The ionosphere-free CNMP architecture obtains complete protection against undetected ionospheric gradients at a cost of doubled position error, but still reduces PLs by 30% to 50% over the single frequency architecture.
Published in:	Proceedings of the 2011 International Technical Meeting of The Institute of Navigation January 24 - 26, 2011 Catamaran Resort Hotel San Diego, CA
Pages:	296 - 311
Cite this article:	Bruckner, D., van Graas, F., Skidmore, T., "Flight Test Results and Multipath Mitigation for Ionosphere-Free, Dual-Frequency Code Noise and Multipath (CNMP) Algorithm on King Air and DC-3 Airframes," Proceedings of the 2011 International Technical Meeting of The Institute of Navigation, San Diego, CA, January 2011, pp. 296-311.
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