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Flight test evaluation of ILS and GBAS performance at Gimpo International Airport

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Abstract

We address the differences in the ways the Instrument Landing System (ILS) and Ground-Based Augmentation System (GBAS) offer approach guidance, and their principles and methods. We perform comparative analysis of the accuracy of deviation between the GBAS Landing System (GLS) and ILS by means of flight tests, using the flight inspection aircraft at Gimpo International Airport. Our results show that the ILS deviation error increases as the distance between the threshold of runway and the aircraft increases; on the other hand, the GLS deviation error is stable, within the range of ±0.5 to ±2 m lateral and vertical deviation, respectively. We also analyze the alignment accuracy of the ILS and GLS based on the evaluation criteria of Category I of the Federal Aviation Administration, and our analysis results confirm that both systems satisfy the requirements (lateral: ±0.1°, vertical: ±0.05°).

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Acknowledgments

This research was supported by the Ministry of Land, Infrastructure and Transport. Thank you for your support.

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Correspondence to Myeong-Sook Jeong.

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Jeong, MS., Bae, J., Jun, HS. et al. Flight test evaluation of ILS and GBAS performance at Gimpo International Airport. GPS Solut 20, 473–483 (2016). https://doi.org/10.1007/s10291-015-0457-1

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