SATELLITE ORBIT DATA COMPRESSING METHOD, SATELLITE ORBIT DATA PROVIDING METHOD, SATELLITE ORBIT DATA DECOMPRESSING METHOD, AND DATA COMPRESSING DEVICE

• US 20100164800A1
• Filed: 12/07/2009
• Published: 07/01/2010
• Est. Priority Date: 12/29/2008
• Status: Active Grant

• Current Assignee: Seiko Epson Corporation (Seiko Group)
• Original Assignee: Seiko Epson Corporation (Seiko Group)
• Inventors: Onda, Kenji
• Granted Patent: US 8,819,289 B2
• Time in Patent Office: Days
• US Class Current: 342/357.420
• CPC Class Codes: G01S 19/05 providing aiding data
• CPC Class Codes: G01S 19/258 relating to the satellite constellation, e.g. almanac, ephemeris data, lists of satellites in view
• CPC Class Codes: G01S 19/27 creating, predicting or correcting ephemeris or almanac data within the receiver

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.

Claims

1. A satellite orbit data compression method comprising:

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.

2. The satellite orbit data compression method according to claim 1, wherein a plurality of variation patterns of the parameter value and compression methods suitable for those variation patterns are predetermined, and

wherein the determining of the compression method includes determining the compression method by selecting one of the plurality of variation patterns that matches with the variation tendency to select the compression method corresponding to the selected variation pattern.

3. The satellite orbit data compression method according to claim 1, wherein the determining of the compression method includes employing a compression method that is predetermined to be suitable for a certain parameter included in the orbit model.

4. The satellite orbit data compressing method according to claim 1, wherein the compression method is a predetermined lossless compression method.

5. A satellite orbit data providing method comprising:

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;

calculating a compressed parameter value by reducing a bit sequence representing the parameter value using the determined compression method; and

providing satellite orbit data including the calculated compressed parameter value to a position calculating device along with identification information of the compression method.

6. A data compressing device comprising:

a determination unit 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

a calculation unit calculating a compressed parameter value by reducing a bit sequence representing the parameter value using the determined compression method.