| 摘要 |
A method for real time subset geometry screening comprises the steps of determining a list of satellites in view of a ground based augmentation system in a navigation satellite system for a subsequent time interval in the future, defining at least one set of subset geometries from the list of available satellites, calculating a respective first à vig for each of the at least one set of subset geometries, setting a respective broadcast à vig for each set of subset geometries as the larger of the first à vig and a second à vig , wherein the second à vig was calculated for the previous time interval, saving the first à vig for a next iteration of the method, and selecting from the plurality of broadcast à vig to match an available broadcast constellation. à vig is a vertical ionosphere gradient standard deviation. |
