Omega System Availability as a Global Measure of Navigation Accuracy

摘要

An augmented Omega System Availability model is presented in which systemavailability is treated as the probability that navigation accuracy is better than a selected threshold. In addition to the four sub-models used in connection with the previously developed System Availability Model, two new sub-models are presented which are needed for a probabilistic description of navigation accuracy as a measure of Omega system availability. One new sub-model describes the sources and statistical distribution of Omega phase errors, while the other sub-model defines the transformation of phase error to position error based on a generic method of Omega navigation commonly used in conventional airborne Omega navigation receiver systems. Resources required for the calculation of the system availability index based on the augmented model are estimated. Finally, as an alternative to the probabilistic model, a very simple GDOP-type form is proposed which could be included as a collective signal criterion in the current deterministic version of the PACE workstation. Keywords: Omega, System performance, System availability algorithm, Station reliability, Receiver reliability availability, Omega signal coverage, Navigation accuracy, Omega signal phase error, Omega navigation algorithm. (rh)