Methods and apparatus for self-assisting positioning system
First Claim
1. A method of implementing a positioning system, the method comprising:
- implementing a buffer configured to store a buffer record for each of a plurality of position fixes determined by a positioning system receiver;
implementing a database configured to store a database record for each of a plurality of threshold positions;
receiving zero or more positioning signals from a plurality of navigational satellites;
accumulating, in the buffer, a plurality of buffer records, wherein each buffer record is for a corresponding one of the plurality of position fixes determined by the positioning system receiver;
identifying a first threshold position near an area in which a degradation event occurs;
recording the first threshold position in a first database record of the database;
identifying a second threshold position near the area, the second threshold position i) indicated by one of the plurality of position fixes outside of the area, and ii) proximate to a position at which the degradation event ends; and
recording the second threshold position in a second database record of the database, the second database record stored in a memory location determinable from the first database record, the first database record stored in a memory location determinable from the second database record.
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Accused Products
Abstract
In a method of implementing a positioning system a buffer is configured to store a buffer record for each of a plurality of position fixes determined by the receiver and a database is configured to store a database record for each of the position fixes. Buffer records are accumulated, with each buffer record corresponding to one of the position fixes determined by the receiver. A first threshold position near an area in which a degradation event occurs is identified and recorded in a first database record. A second threshold position near the area is identified in a second database record. The second threshold position is indicated by one of the position fixes outside of the area and is proximate to a position at which the degradation event ends.
13 Citations
13 Claims
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1. A method of implementing a positioning system, the method comprising:
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implementing a buffer configured to store a buffer record for each of a plurality of position fixes determined by a positioning system receiver; implementing a database configured to store a database record for each of a plurality of threshold positions; receiving zero or more positioning signals from a plurality of navigational satellites; accumulating, in the buffer, a plurality of buffer records, wherein each buffer record is for a corresponding one of the plurality of position fixes determined by the positioning system receiver; identifying a first threshold position near an area in which a degradation event occurs; recording the first threshold position in a first database record of the database; identifying a second threshold position near the area, the second threshold position i) indicated by one of the plurality of position fixes outside of the area, and ii) proximate to a position at which the degradation event ends; and recording the second threshold position in a second database record of the database, the second database record stored in a memory location determinable from the first database record, the first database record stored in a memory location determinable from the second database record. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A positioning system apparatus comprising:
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a positioning system receiver configured to receive signals from a plurality of navigational satellites; a processor communicatively coupled to the positioning system receiver; a memory buffer communicatively coupled to the processor; a database communicatively coupled to the processor; and one or more routines executed by the processor and collectively operative to; cause accumulation in the buffer of a plurality of buffer records, each buffer record for a corresponding one of a plurality of position fixes of the positioning system receiver; identify a first threshold position near an area of degraded signal reception; record the first threshold position in a first database record of the database; identify a second threshold position near the area of degraded signal reception; record the second threshold position in a second database record of the database, the second database record stored in a memory location determinable from the first database record, the first database record stored in a memory location determinable from the second database record. - View Dependent Claims (9, 10, 11, 12, 13)
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Specification