Patent ID: 9529090
Filing Date: 2016-12-27
CPC Classification: G01S

Claim Text:
1. A method of satellite status judgment, the method comprising steps of: selecting, by a positioning apparatus, a plurality of observation satellites from a plurality of satellites according to a first condition; selecting, by the positioning apparatus, each of the observation satellites in turn as a target satellite; obtaining, by the positioning apparatus, a variation slope of a signal of the target satellite at a first observation time period, wherein the variation slope is determined according to a change in carrier-to noise ratio measurements of the signal over the first observation time period; determining, by the positioning apparatus, whether the target satellite should be masked according to the variation slope of the signal over the first observation time period; generating, by the positioning apparatus, a prompt message when it is determined that the target satellite should be masked; masking, by the positioning apparatus, positioning signals transmitted from the target satellite according to the prompt message; obtaining the variation slope of the signal of the target satellite at a plurality of observation time periods subsequent to the first observation time period; and determining whether the variation slope of the signal has a positive slope for a predetermined number of subsequent observation time periods in a row greater than one, and if so, no longer masking the target satellite.