Title:
移動機端末及び伝播遅延時間の予測演算装置
Document Type and Number:
Japanese Patent JP4386996
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a predicting device for propagation delay time capable of reliably performing transmission with an allocated time slot when communication is restored even through the communication between an orbiting satellite and a mobile terminal is temporarily disconnected. SOLUTION: The time slots of up and down links with an orbiting satellite SV are allocated to a mobile terminals SU, and the terminal SU performs transmission for the up link so as to go into the time slot of the satellite SV with the arrival time of a radio wave from the satellite SV as a reference. The terminal SU is provided with a means 32 for acquiring the Doppler frequency of a radio frequency at the downlink of the satellite SV, a disconnected time measuring means 34 for measuring the elapsed time from communication disconnection start with the satellite SV till downlink reception restart, and a predictively computing means 36 for compreting propagation delay time with the satellite SV from the Doppler frequency at the communication disconnection start with the satellite SV and the elapsed time.
Inventors:
Shigeru Kimura
Application Number:
JP21821499A
Publication Date:
December 16, 2009
Filing Date:
July 30, 1999
Export Citation:
Assignee:
Kyocera Corporation
International Classes:
H04B7/15; H04B7/26; H04W84/06
Domestic Patent References:
| JP10271055A | ||||
| JP5145481A | ||||
| JP10051849A | ||||
| JP9023476A |
Foreign References:
| US5444450 |
Other References:
石川博康 他,非静止衛星通信システムにおけるユーザ位置検出の不確定性除去方式,電子情報通信学会論文誌 B-II,日本,社団法人 電子情報通信学会,1998年 8月25日,Vol.81, No.8,pages.773-780
W.Zhao et.al.,Positioning Assisted Inter-segment Handover for Integrated GSM-Satellite Mobile System,Fifth International Conference on Satellite Systems for Mobile Communiations and Navigation,米国,IEE,1996年 5月13日,Conference Publication No.424,pages.124-128
Paul C. Chestnut,Emitter Location Accuracy Using TDOA and Differential Doppler,IEEE Transactions on Aerospace and Electronic Systems,米国,IEEE,1982年 3月,Vol.AES-18, No.2,pages.214-218
W.Zhao et.al.,Positioning Assisted Inter-segment Handover for Integrated GSM-Satellite Mobile System,Fifth International Conference on Satellite Systems for Mobile Communiations and Navigation,米国,IEE,1996年 5月13日,Conference Publication No.424,pages.124-128
Paul C. Chestnut,Emitter Location Accuracy Using TDOA and Differential Doppler,IEEE Transactions on Aerospace and Electronic Systems,米国,IEEE,1982年 3月,Vol.AES-18, No.2,pages.214-218
Attorney, Agent or Firm:
Masatake Shiga
Takashi Watanabe
Masakazu Aoyama
Yutaka Matsutomi
Yasuhiko Murayama
Takashi Watanabe
Masakazu Aoyama
Yutaka Matsutomi
Yasuhiko Murayama