Preliminary Assessment of Loran for Required Navigation Performance 1.0

摘要

Our initial feasibility study suggests that RNP 1.0 achievable with reasonable availability. The RNP 1.0 receiver will use a grid of propagation delay parameters for positioning and determining the confidence of the solution. The grid, due to implementation factors, will result in errors that will be larger than those encountered by the RNP 0.3 user. An analysis was conducted using expected upper bound values for propagation parameters such as ASF and ECD. As in the RNP 0.3 case, the RNP 1.0 availability is mainly driven by the availability of cycle confidence. While additional gains may be achieved through better algorithms for choosing stations for the cycle confidence solution, the improvements are not significant. If the refined noise processing model is validated, RNP 1.0 can be achieved with very high availability even with extreme values of ASF and ECD. While, additional work needs to be done, particularly determining continuity, system design, and assessing grid density, the preliminary results suggest that RNP 1.0 is feasible using a design that is not too burdensome.