Reelektronika’s Differential eLoran Reference Station is a key component for maritime Harbour Entrance and Approach applications. The Reference Station provides differential corrections for all relevant eLoran stations necessary for the marine user to achieve the HEA accuracy requirement of 10-20 m (95%).

Differential eLoran Reference Station

Harbour Entrance and Approach

The maritime Harbour Entrance and Approach application requires the very best performance that eLoran can deliver. To reach the HEA accuracy requirement the basic eLoran system has to be augmented by a differential eLoran service and an ASF survey map of the harbour area. The ASF map provides nominal ASF values along the harbour approach path for all relevant eLoran stations, whereas the Loran data channel provides differential corrections to correct for the deviation from the published nominal ASFs. By measuring the basic eLoran signals and correcting the mapped ASF value for his current location by the received differential corrections the user receiver is now capable to calculate an eLoran position solution providing the best positioning performance eLoran has to offer.

Differential eLoran service

Reelektronika’s Differential eLoran Reference Station is installed on a fixed location with known nominal ASF values for all eLoran stations of interest. By comparing the current measured Time of Arrival with the expected Time of Arrival based on distance towards the transmitter and the nominal ASF, the Reference Station calculates the differential corrections, which are communicated to the eLoran network for distibution. In order to get the best possible correction accuracy, the Reference Station is equipped with an eLoran simulator for continuous calibration of the signal processing paths. Additionally, the Reference Station provides on-site integrity horizontal positioning monitoring on the calculated corrections to protect the HEA application’s integrity.

Please also refer to the commercial and technical documentation under Product Documentation and Product Manuals.