POSITION CALCULATION METHOD AND POSITION CALCULATION SYSTEM

• US 20120166081A1
• Filed: 02/28/2012
• Published: 06/28/2012
• Est. Priority Date: 02/26/2008
• Status: Abandoned Application

• Current Assignee: Seiko Epson Corporation (Seiko Group)
• Original Assignee: Seiko Epson Corporation (Seiko Group)
• Inventors: UCHIDA, Shuji
• Application Number:
  US13/407,310
• Publication Number:
  US 20120166081A1
• Time in Patent Office: Days
• US Class Current: 701/468
• CPC Class Codes: G01S 19/05 providing aiding data
• CPC Class Codes: G01S 19/27 creating, predicting or correcting ephemeris or almanac data within the receiver

Abstract

A position calculation method includes storing navigation data at a given reference date as reference navigation data corresponding to the reference date, transmitting the reference date to request a server that provides navigation data to transmit latest differential navigation data that indicates a difference between the navigation data at the reference date and latest navigation data, receiving the latest differential navigation data from the server, and calculating a position by performing given positioning calculations based on the latest differential navigation data received from the server and the reference navigation data.

Claims

1. (canceled)

2. A method for calculating a position of a position calculation device:

requesting long-term predicted ephemeris, the long-term predicted ephemeris including a first predicted value of satellite orbit parameter valid in a first unit period and a difference between the first predicted value and a second predicted value of the satellite orbit parameter valid in a second unit period;

acquiring the long-term predicted ephemeris; and

calculating the position of the position calculation device using the long-term predicted ephemeris.

3. A method for transmitting long-term predicted ephemeris comprising:

receiving a request of the long-term predicted ephemeris, the long-term predicted ephemeris including a first predicted value of satellite orbit parameter valid in a first unit period and a difference between the first predicted value and a second predicted value of the satellite orbit parameter valid in a second unit period;

calculating the difference in response to the request; and

transmitting the long-term predicted ephemeris.

4. A system comprising:

a position calculation device including;

a request unit that requests long-term predicted ephemeris to a server, the long-term predicted ephemeris including a first predicted value of satellite orbit parameter valid in a first unit period and a difference between the first predicted value and a second predicted value of the satellite orbit parameter valid in a second unit period;

an acquiring unit that acquires the long-term predicted ephemeris from the server; and

a position calculator that calculates a position of the position calculation device using the long-term predicted ephemeris,

the server including;

a receiver that receives the request of the long-term predicted ephemeris from the position calculation device;

a difference calculator that calculates the difference in response to the request; and

a transmitter that transmits the long-term predicted ephemeris to the position calculation device.