MOVABLE BODY POSITION MEASURING SYSTEM, CENTRAL STATION, QUESTION CONTROL METHOD USED THEREIN, AND STORAGE MEDIUM ON WHICH PROGRAM THEREOF HAS BEEN STORED

Title:

MOVABLE BODY POSITION MEASURING SYSTEM, CENTRAL STATION, QUESTION CONTROL METHOD USED THEREIN, AND STORAGE MEDIUM ON WHICH PROGRAM THEREOF HAS BEEN STORED

Document Type and Number:

WIPO Patent Application WO/2013/121775

Kind Code:

A1

Abstract:

An aircraft position measuring system comprises at least one or more transmitting apparatuses (3) that transmit, to a movable body (4), question signals used for acquiring response signals. A central station (1) comprises: a question signal determining means that determines, as question control information, the question signals, which are to be transmitted by the transmitting apparatuses, and transmission times at which the question signals are to be transmitted by the transmitting apparatuses; and a means that transmits, to the transmitting apparatuses, the question control information determined by the question signal determining means. The question signal determining means, which includes a means for determining a system status every first time frame that is a time interval obtained by division using a predetermined time width, determines, on the basis of the system status, the question signals, which are to be transmitted by the transmitting apparatuses, and the transmission times at which the question signals are to be transmitted by the transmitting apparatuses. This provides a movable body position measuring system that can immediately transmit question signals to an aircraft, which requires the question signals, while restricting the number of question signal transmissions below a specified upper limit, without transmitting unnecessary question signals.

Inventors:

SATO TAKESHI (JP)
KONDO TEMPEI (JP)
KITAJIMA MASAAKI (JP)

Application Number:

PCT/JP2013/000759

Publication Date:

August 22, 2013

Filing Date:

February 13, 2013

Export Citation:

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Assignee:

NEC CORP (JP)
SATO TAKESHI (JP)
KONDO TEMPEI (JP)
KITAJIMA MASAAKI (JP)

International Classes:

G01S13/91; G01S13/76

Foreign References:

JP2006208026A	2006-08-10
JP2009098137A	2009-05-07
US5825322A	1998-10-20
JP2008146450A	2008-06-26
JP2011209211A	2011-10-20

Attorney, Agent or Firm:

IEIRI, Takeshi (JP)
House ON 健 (JP)

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