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US 8,819,289 B2Granted
Satellite orbit data compressing method, satellite orbit data providing method, satellite orbit data decompressing method, and data compressing device
AssigneeSeiko Epson Corporation
InventorKenji Onda
Life of this patent
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Abstract
A satellite orbit data compressing method includes: determining a compression method of a parameter value on the basis of a variation tendency of the parameter value in an orbit model approximating a satellite orbit; and calculating a compressed parameter value by reducing a bit sequence representing the parameter value using the determined compression method.
Claims6
A satellite orbit data compression method comprising:
- determining a first compression method of a first set of values for a parameter in a first time period based on a first variation tendency of the first set of values in the first time period;
- compressing the first set of values using the first compression method;
- determining a second compression method of a second set of values for the parameter in a second time period based on a second variation tendency of the second set of values in the second time period, the second time period being longer than the first time period, the second variation tendency being different from the first variation tendency;
- and
- compressing the second set of values using the second compression method.
2 more elements
A satellite orbit data compression method comprising:
- determining a first compression method of a first set of values for a parameter in a first time period based on a first variation tendency of the first set of values in the first time period;
- compressing the first set of values using the first compression method;
- determining a second compression method of a second set of values for the parameter in a second time period based on a second variation tendency of the second set of values in the second time period, the second time period being longer than the first time period, the second variation tendency being different from the first variation tendency;
- compressing the second set of values using the second compression method;
- and
- providing long-term predicted ephemeris having one of the first and second sets of values that has been compressed to a position calculating device along with identification information of respective one of the first and second compression method for the parameter.
3 more elements
A satellite orbit data compressing device comprising:
- a determination unit configured to determine a first compression method of a first set of values for a parameter in a first time period based on a first variation tendency of the first set of values in the first time period, the determination unit being further configured to determine a second compression method of a second set of values for the parameter in a second time period based on a second variation tendency of the second set of values in the second time period, the second time period being longer than the first time period, the second variation tendency being different from the first variation tendency;
- and
- a calculation unit configured to compress the first set of values using the first compression method, the calculation unit being further configured to compress the second set of values using the second compression method.
Dependencies are inferred from the claim text.