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1. (WO2013121775) MOVABLE BODY POSITION MEASURING SYSTEM, CENTRAL STATION, QUESTION CONTROL METHOD USED THEREIN, AND STORAGE MEDIUM ON WHICH PROGRAM THEREOF HAS BEEN STORED

Pub. No.:    WO/2013/121775    International Application No.:    PCT/JP2013/000759
Publication Date: Fri Aug 23 01:59:59 CEST 2013 International Filing Date: Thu Feb 14 00:59:59 CET 2013
IPC: G01S 13/91
G01S 13/76
Applicants: NEC CORPORATION
日本電気株式会社
SATO, Takeshi
佐藤 毅
KONDO, Tempei
近藤 天平
KITAJIMA, Masaaki
北島 正明
Inventors: SATO, Takeshi
佐藤 毅
KONDO, Tempei
近藤 天平
KITAJIMA, Masaaki
北島 正明
Title: MOVABLE BODY POSITION MEASURING SYSTEM, CENTRAL STATION, QUESTION CONTROL METHOD USED THEREIN, AND STORAGE MEDIUM ON WHICH PROGRAM THEREOF HAS BEEN STORED
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.