Method and apparatus for location-based triggering in an assisted satellite positioning system
First Claim
1. A method of location-based triggering in a mobile receiver, comprising:
- designating a triggering region;
obtaining satellite trajectory data;
generating, from said satellite trajectory data, expected pseudorange data for a virtual center in said triggering region;
measuring pseudoranges from said mobile receiver to a plurality of satellites;
computing a delta position with respect to said virtual center using said satellite trajectory data, said measured pseudoranges, and said expected pseudorange data; and
comparing said delta position with a radius restriction value associated with said virtual center.
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Abstract
Method and apparatus for location-based triggering in a mobile receiver is described. In one example, a triggering region is designated. Expected pseudorange data is generated within the mobile receiver and pseudoranges to a plurality of satellites are measured. A delta position is computed with respect to a virtual center of the triggering region using satellite trajectory data, the measured pseudoranges, and the expected pseudoranges. The delta position is compared with the radius restriction value, the results of which may be used to trigger an event. In another example, expected pseudorange data is obtained at the mobile receiver. Pseudoranges from the mobile receiver to a plurality of satellites are measured. The measured pseudoranges and expected pseudoranges are compared using a metric to produce delta values. The delta values are compared with a radius restriction value, the results of which may be used to trigger an event.
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Citations
34 Claims
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1. A method of location-based triggering in a mobile receiver, comprising:
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designating a triggering region; obtaining satellite trajectory data; generating, from said satellite trajectory data, expected pseudorange data for a virtual center in said triggering region; measuring pseudoranges from said mobile receiver to a plurality of satellites; computing a delta position with respect to said virtual center using said satellite trajectory data, said measured pseudoranges, and said expected pseudorange data; and comparing said delta position with a radius restriction value associated with said virtual center. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of location-based triggering in a mobile receiver, comprising:
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designating a triggering region; obtaining acquisition assistance data at said mobile receiver from a network, said acquisition assistance data including at least expected pseudoranges; measuring pseudoranges from said mobile receiver to a plurality of satellites; comparing said measured pseudoranges and said expected pseudoranges using a metric to produce delta values; and comparing said delta values with a radius restriction value associated with said triggering region. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A mobile receiver, comprising:
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a memory for storing satellite trajectory data; a satellite signal receiver for measuring pseudoranges from said mobile receiver to a plurality of satellites; and a processor for generating expected pseudoranges, computing a delta position with respect to a virtual center of a triggering region using said satellite trajectory data, said measured pseudoranges, and said expected pseudoranges, and for comparing said delta position with a radius restriction value associated with said triggering region. - View Dependent Claims (24, 25, 26, 27)
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28. A mobile receiver, comprising:
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a wireless transceiver for receiving acquisition assistance data from a network, where said acquisition assistance data includes at least expected pseudoranges; a satellite signal receiver for measuring pseudoranges from said mobile receiver to a plurality of satellites; and a processor for comparing said measuring pseudoranges and said expected pseudoranges using a metric to produce delta values, and for comparing said delta values with a radius restriction value of a triggering region having a virtual center. - View Dependent Claims (29, 30, 31, 32, 33, 34)
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Specification