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Method of satellite status judgment

  • US 9,529,090 B2
  • Filed: 09/06/2011
  • Issued: 12/27/2016
  • Est. Priority Date: 09/08/2010
  • Status: Active Grant
First Claim
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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.

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