GPS receiver, position-detecting system and positioning method
First Claim
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1. A GPS receiver comprising:
- storage means for storing an almanac included in GPS data received from a satellite currently being seized;
seizing means for searching said almanac stored in said storage means for other seizable satellites in addition to the satellite currently being seized and proceeding to seize said other satellites;
positioning means for determining a current position based on the GPS data received from a plurality of satellites currently being seized by said seizing means; and
seized-object management means for requesting said seizing means to cancel all currently seized satellites and to resume attempts to seize satellites by referring to the almanac stored in said storage means, when said positioning means fails to complete a positioning process of the current position determination within a predetermined period of time.
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Abstract
When a 2-dimensional positioning or 3-dimensional positioning cannot be completed within a predetermined period of time, all currently seized satellites are cancelled and a stored almanac is referred to in order to resume attempts to seize satellites.
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Citations
8 Claims
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1. A GPS receiver comprising:
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storage means for storing an almanac included in GPS data received from a satellite currently being seized;
seizing means for searching said almanac stored in said storage means for other seizable satellites in addition to the satellite currently being seized and proceeding to seize said other satellites;
positioning means for determining a current position based on the GPS data received from a plurality of satellites currently being seized by said seizing means; and
seized-object management means for requesting said seizing means to cancel all currently seized satellites and to resume attempts to seize satellites by referring to the almanac stored in said storage means, when said positioning means fails to complete a positioning process of the current position determination within a predetermined period of time. - View Dependent Claims (2)
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3. A position-detecting system comprising a receiver and presenting means, wherein
said receiver comprises: -
storage means for storing an almanac included in GPS data received from a satellite currently being seized;
seizing means for searching said almanac stored in said storage means for other seizable satellites in addition to the satellite currently being seized and proceeding to seize said other satellites;
positioning means for determining a current position based on the GPS data received from a plurality of satellites currently being seized by said seizing means; and
seized-object management means for requesting said seizing means to cancel all currently seized satellites and to resume attempts to seize satellites by referring to the almanac stored in said storage means, when said positioning means fails to complete a positioning process of the current position determination within a predetermined period of time; and
whereinsaid presenting means presents the current position determined by said GPS receiver. - View Dependent Claims (4, 5, 6)
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7. A position-measuring method comprising the steps of:
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receiving GPS data from a satellite currently being seized and storing an almanac included in said GPS data;
searching said almanac for other seizable satellites in addition to said satellite currently being seized and proceeding to seize said other satellites;
determining a current position based on the GPS data received from a plurality of satellites currently being seized by said seizing means; and
canceling all currently seized satellites and resuming attempts to seize satellites by referring to the almanac stored in said storage means, when the step of determining the current position fails to be completed within a predetermined period of time. - View Dependent Claims (8)
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Specification