Samenvatting

Global Navigation Satellite Systems (GNSS) currently dominate the Positioning, Navigation and Timing (PNT) community and there are no signs that this will change in the near future. But for many years the weeknesses of GNSS have been well known and besides research into GNSS a lot of research into back up systems like Inertial Navigation Systems (INS) and eLoran has been done. For military operations high availability of PNT data is of utmost importance. We estimate that the probability that GNSS is not available for a long period of time and in conjunction with that the risk that a military operation fails due to a lack of continuity of service is very small. In view of this an expensive back up system is not justified in our opinion. Therefore we began research into a low cost eLoran receiver. To this end we purchased the LORADD SP eLoran receiver made by the Dutch firm Reelektronika. The main data produced by this receiver are position, time and heading. Besides low cost a back up system should at least meet the requirements for positioning and heading. The requirements have been taken from several civilian documents since the Netherlands Armed Forces currently do not have an official policy on PNT.In this article the positioning and heading performance of the LORADD SP receiver will be investigated and tested against the requirements. Because it is a preliminary research into eLoran at the NLDA the research is also meant to give hands on experience in this field and to generate research topics.