SYSTEM AND METHOD FOR REAL TIME SUBSET GEOMETRY SCREENING FOR VARYING SATELLITE CONSTELLATIONS

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 σvig for each of the at least one set of subset geometries, setting a respective broadcast σvig for each set of subset geometries as the larger of the first σvig and a second σvig, wherein the second σvig was calculated for the previous time interval, saving the first σvig for a next iteration of the method, and selecting from the plurality of broadcast σvig to match an available broadcast constellation. σvig is a vertical ionosphere gradient standard deviation.

主权项

1. A method for real time subset geometry screening comprising 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 σvig for each of the at least one set of subset geometries, wherein σvig is a vertical ionosphere gradient standard deviation; setting a respective broadcast σvig for each set of subset geometries as the larger of the first σvig and a second σvig, wherein the second σvig was calculated for the previous time interval; saving the first σvig for a next iteration of the method; and selecting from the plurality of broadcast σvig to match an available broadcast constellation.