A Method of Providing Integrity for eLoran

C. Hargreaves and P. Williams

Abstract:	eLoran is a terrestrial radio-navigation system, born out of Loran-C, that consists of a number of high-powered transmitters that operate by emitting a series of precisely timed pulses of radio-frequency centred at 100kHz. To provide high-accuracy eLoran services the GLA publish maps of precisely surveyed Additional Secondary Factor (ASF) data. In addition, local differential-Loran reference-stations are employed to broadcast temporal-corrections to the user. The GLA have argued that eLoran possesses the capability to act as a national, and international, backup to GPS for maritime navigation, and other user sectors. The GLA have demonstrated that provision of accurate ASF data and a DLoran service can enable the mariner to fix their position using eLoran with a 95% accuracy of better than 10m. Long-term monitoring of the eLoran transmissions has demonstrated that the required levels of signal availability can be met by the service. eLoran must also demonstrate that it can provide the required levels of Integrity if it is to be a trusted navigation service.
Published in:	Proceedings of the 2014 International Technical Meeting of The Institute of Navigation January 27 - 29, 2014 Catamaran Resort Hotel San Diego, California
Pages:	588 - 593
Cite this article:	Hargreaves, C., Williams, P., "A Method of Providing Integrity for eLoran," Proceedings of the 2014 International Technical Meeting of The Institute of Navigation, San Diego, California, January 2014, pp. 588-593.
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