Abstract
A major challenge in using GPS guidance for aircraft final approach and landing is to reject interference that can jam reception of the GPS signals. Antenna arrays, which use space–time adaptive processing (STAP), significantly improve the signal to interference plus noise ratio, but at the possible expense of distorting the received signals, leading to timing biases that may degrade navigation performance. Rather than a sophisticated calibration approach to remove biases introduced by STAP, this paper demonstrates that a relatively compact calibration strategy can substantially reduce navigation biases, even under elevated interference conditions. Consequently, this paper develops an antenna bias calibration strategy for two classes of adaptive array algorithm and validates this method using both simulated and experimental data with operational hardware in the loop. A proof-of-concept system and an operational prototype are described, which implement the adaptive antenna algorithms and deterministic corrections. This investigation demonstrates that systems with adaptive antenna arrays can approach the accuracy and integrity requirements for automatic aircraft landing, and in particular for sea-based landing on board aircraft carriers, while simultaneously providing significant attenuation of interference. Evidence suggests that achieving these goals is possible with minimal restrictions on system hardware configuration—specifically, limitations on the permissible level of antenna anisotropy and the use of sufficient analog-to-digital converter resolution.
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Acknowledgments
The authors gratefully acknowledge the support of the JPALS Program Office and the Naval Air Warfare Center Aircraft Division through contract N00421-05-C-0068 and the Federal Aviation Administration on Cooperative Agreement 97-G-012. The authors also thank Dr. Herb Rauch, Dr. Jennifer Gautier, Dr. Ung-Suok Kim, and Prof. Dennis Akos for useful discussions that contributed to this work.
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This work is respectfully dedicated to the memory of Dr. Herb Rauch, who passed away as this article was going to press.
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De Lorenzo, D.S., Lo, S.C., Enge, P.K. et al. Calibrating adaptive antenna arrays for high-integrity GPS. GPS Solut 16, 221–230 (2012). https://doi.org/10.1007/s10291-011-0224-x
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DOI: https://doi.org/10.1007/s10291-011-0224-x