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公开(公告)号：JP2006186540A
公开(公告)日：2006-07-13
申请号：JP2004376384
申请日：2004-12-27
Applicant: MURATA MANUFACTURING CO , ATR ADVANCED TELECOMM RES INST
Inventor： FURUTOI TOMOSHIGE , TAROUMARU MAKOTO , HIRATA AKIHITO , OHIRA TAKASHI
Abstract: PROBLEM TO BE SOLVED: To provide an incoming direction estimation apparatus in which a miniaturization and a cost reduction are possible, reliability and durability are excellent, and no calibration by no skillful technology, etc. are required. SOLUTION: In the incoming direction estimation apparatus, a joint switching means 20 controls the reactance set of varactor diodes 11-16 by control voltage sets CLV1-CLV6 so that an antenna element 7 and antenna elements 1-6 which element coupling may rotate the ambients of the antenna element 7. An array antenna 10 receives a received signal when the antenna element 7 and the antenna elements 1-6 which perform element coupling rotation ambients of the antenna element 7. A frequency shift detection means 40 detects the frequency shift spectrum of the incoming wave based on the received signal received from the antenna element 7 through a booster 30. A direction estimation means 50 presumes an angle in which the frequency shift spectrum performs a zero cross to be the incoming direction of the incoming wave. COPYRIGHT: (C)2006,JPO&NCIPI
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公开(公告)号：JP2003258534A
公开(公告)日：2003-09-12
申请号：JP2002058884
申请日：2002-03-05
Applicant: ATR ADVANCED TELECOMM RES INST
Inventor： NAKAJI TAKAYO , KIKUMA NOBUYOSHI , INAGAKI NAOKI , OHIRA TAKASHI
Abstract: PROBLEM TO BE SOLVED: To provide a control method of an ESPAR (Electronically Steerable Passive Array Radiator) antenna that can calculate an optimum solution of a reactance value of each variable reactance element in a short calculation time when the major beam of an antenna system is directed to a desired wave and the null pattern is directed to an interference wave. SOLUTION: An adaptive control type controller 20 calculates an evaluation function value Q t on the basis of a received reception signal y(t), uses the Marcato method having a Marcato number on the basis of the evaluation function value Q t to calculate a difference reactance value of each of variable reactance elements 12-1 to 12-6, sequentially repeats perturbation of the reactance of each of the variable reactance elements 12-1 to 12-6 by a prescribed difference reactance value so as to calculate and set the optimum solution of the reactance value of each of the variable reactance elements 12-1 to 12-6 for directing the major beam to the direction of the desired wave and the null pattern to the direction of the interference wave for maximization of the evaluation function value thereby controlling the Marcato number α to be gradually decreased as the reactance value approaches the optimum solution. COPYRIGHT: (C)2003,JPO
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公开(公告)号：JP2003209425A
公开(公告)日：2003-07-25
申请号：JP2002007413
申请日：2002-01-16
Applicant: ATR ADVANCED TELECOMM RES INST
Inventor： OHIRA TAKASHI
Abstract: PROBLEM TO BE SOLVED: To adaptively control the directivity of an array antenna without requiring a reference signal even when a transmitted radio signal is modulated by a modulation method including digital amplitude modulation. SOLUTION: An adaptive control type controller 20 calculates a power ratio R respectively concerning power values at two signal points in the mutually different combination of received signals during one frame period on the basis of received signals y(t), calculates discrete power ratios R 1 , R 2 ,..., R max from the respective calculated power ratios R with the time average value or ensemble average value of minimum values in the absolute values of subtracted values as a target function value, calculates and sets the reactance value of respective variable reactance elements 12-1 to 12-6 by using a maximum grade method to direct the main beam of an esper antenna device 100 toward a desired wave and to direct a null toward interference for substantially minimizing the target function value. COPYRIGHT: (C)2003,JPO
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公开(公告)号：JP2003188797A
公开(公告)日：2003-07-04
申请号：JP2001384151
申请日：2001-12-18
Applicant: ATR ADVANCED TELECOMM RES INST
Inventor： FURUTOI TOMOSHIGE , OHIRA TAKASHI
Abstract: PROBLEM TO BE SOLVED: To improve efficiency in routing on a wireless network and to remarkably shorten a route discovery time. SOLUTION: In a radio station provided with a variable beam antenna 15 capable of selectively switching the omni-pattern of a non-directional radiation pattern and a sector beam pattern which can be scanned by selectively changing a main beam in the form of sector for each prescribed azimuth angle within a horizontal plane with the present station as a center, when an RREQ signal is received from the radio station of a transmitting source while the variable beam antenna 15 is under waiting in the omni-pattern, the variable beam antenna 15 is scanned by a sector beam pattern to detect the arrival azimuth angle information of a sector to become a maximum receiving strength and while using the sector beam pattern of a sector on the back side substantially at 180° to the detected arrival azimuth angle information, the RREQ signal constituted by adding the radio station number of the present station and the arrival azimuth angle information is transmitted. Such processing is repeated until the radio station of a destination receives the RREQ signal. COPYRIGHT: (C)2003,JPO
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15.发明专利
公开(公告)号：JP2003177820A
公开(公告)日：2003-06-27
申请号：JP2001374682
申请日：2001-12-07
Applicant: NTT ADVANCED TECH KK , ATR ADVANCED TELECOMM RES INST
Inventor： TANAKA HIDEKAZU , MASUDA JUNICHI , KAWASAKI RYOJI , SAKAMOTO HIROSHI , OHIRA TAKASHI , FURUTOI TOMOSHIGE
Abstract: PROBLEM TO BE SOLVED: To realize a self-traveling device capable of recognizing the radio wave arriving direction of a radio transmitter based on a radio wave received by changing the directivity of an electronically steerable parasitic array radiator antenna, and automatically self-traveling toward the direction. SOLUTION: This unmanned carrier (self-traveling device) 4 self-traveling toward the radio wave arriving direction of a portable radio transmitter (radio transmitting source) 1 is provided with an electronic control type array antenna (an electronically steerable parasitic array radiator antenna) 5 capable of electronically controlling the directivity, a transmitter/receiver 7 having a radio wave arriving direction detecting means for calculating the angle information in the direction of the maximum intensity of the reception signal based on a radio wave received by changing the reception directivity of the antenna 5, an unmanned carrier controller 8 for operating this self-traveling device toward the direction indicated by the angle information, a traveling motor 9 for driving according to the control of the unmanned carrier controller 8, and wheels to be driven by the traveling motor 9. COPYRIGHT: (C)2003,JPO
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Patent Agency Ranking
公开(公告)号：JP2003163612A
公开(公告)日：2003-06-06
申请号：JP2001358777
申请日：2001-11-26
Applicant: ATR ADVANCED TELECOMM RES INST
Inventor： TEI TAKASHI , OHIRA TAKASHI , WATANABE YOICHIRO
Abstract: PROBLEM TO BE SOLVED: To correct errors of transmitted digital signals even when there is channel noise in a multiple access communication system. SOLUTION: Encoders 2-(i,j) Kronecker-multiply a Hadamard matrix of a prescribed order q with a prescribed spread spectrum sequence, generate the spread spectrum sequence of the result, multiply the generated spread spectrum sequence with inputted digital signals and output the multiplied result as encoded signals. A decoder 25 converts reception signals including a plurality of the encoded signals so as to be represented in the form of a matrix, multiplies the converted matrix by the Hadamard matrix, generates the matrix of the result, executes an error correction processing by changing respective components of the matrix so as to be a closest multiple of order q, calculates intermediate signal vectors for the respective encoded signals by dividing the error-corrected matrix by the order q and decodes the digital signals corresponding to the respective encoded signals from the calculated intermediate signal vectors. COPYRIGHT: (C)2003,JPO
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公开(公告)号：JP2003142925A
公开(公告)日：2003-05-16
申请号：JP2001337958
申请日：2001-11-02
Applicant: ATR ADVANCED TELECOMM RES INST
Inventor： OHIRA TAKASHI
Abstract: PROBLEM TO BE SOLVED: To easily find a reactance value for forming the main beam of an ESPAR (electronically steerable passive array radiator) antenna. SOLUTION: A reactance value calculation controller 22, when calculating reactance values xk of variable reactance elements 12-1 to 12-6 for setting the main beam of a ESPAR antenna system 100 to respective radiation directions so that the value of an evaluation function P(θ, ϕ) showing RF electric power by using the method of steepest gradient becomes maximum, uses the reactance values of the variable reactance elements 12-1 to 12-6 at the moment when a current vector consisting of respective currents flowing to a driven element A0 and non-driven elements A1 to A6 is a complex conjugate of a steering vector a(θ, ϕ) representing the directions of the ESPAR antenna system 100 in respective radiation directions when the phase center of the ESPAR antenna system 100 is set to the driven element A0 and approximate in-phase synthesis is performed by the ESPAR antenna system 100.
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公开(公告)号：JP2003114268A
公开(公告)日：2003-04-18
申请号：JP2001309904
申请日：2001-10-05
Applicant: ATR ADVANCED TELECOMM RES INST , NTT ADVANCED TECH KK
Inventor： FURUTOI TOMOSHIGE , OHIRA TAKASHI , TANAKA HIDEKAZU
Abstract: PROBLEM TO BE SOLVED: To provide a detector for an electric wave arrival direction detecting system and its control method, allowing accurate detection of the direction of the maximum received signal strength at all times. SOLUTION: Electric waves of transmission pulses emitted by a transmitter 1 are received while changing the direction of a receiving beam of the electric wave arrival direction detector 10 over all azimuth angles in detecting the maximum received signal strength, thereby, an electric wave arrival direction is detected. Herein, the pulse duration of the transmission pulses are set to be not shorter than a processing time period for receiving the electric waves while changing the direction of the receiving beam of the detector 10 over all azimuth angles in detecting the maximum received signal strength. A controller 35 of the detector 10 detects the rise of the transmission pulses and detects the electric wave arrival direction by receiving the electric waves while changing the direction of receiving beam of a detecting device over all azimuth angles since a detection point, in detecting the maximum received signal strength.
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公开(公告)号：JP2006352206A
公开(公告)日：2006-12-28
申请号：JP2005171976
申请日：2005-06-13
Applicant: ATR ADVANCED TELECOMM RES INST
Inventor： TAROUMARU MAKOTO , OHIRA TAKASHI , ITO TAKASHI , YAMAMOTO MAKOTO , SAWATANI TAKUMA
Abstract: PROBLEM TO BE SOLVED: To provide an array antenna system capable of easily improving bad display of a television receiver or hard-of-hearing of a radio receiver. SOLUTION: The array antenna system 100 includes an array antenna 10 and a control unit 20. The array antenna 10 includes a feeding element 2, parasitic elements 3, 4 and varactor diodes 6 to 9. The varactor diodes 6, 7 are loaded to the parasitic element 3, and the varactor diodes 8, 9 are loaded to the parasitic element 4. The control unit 20 includes a solar cell 22 and a control unit 23. The solar cell 22 receives light from a fluorescent light in a room to generate power, and the control unit 23 is started by a DC power from the solar cell 22. Upon the receipt of a particular signal from a remote controller 40, the control unit 23 applies control voltages CV1 to CV4 respectively to the varactor diodes 6 to 9 via control lines 12 to 15 to switch the directivity of the array antenna 10. COPYRIGHT: (C)2007,JPO&INPIT
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公开(公告)号：JP2003209426A
公开(公告)日：2003-07-25
申请号：JP2002007419
申请日：2002-01-16
Applicant: ATR ADVANCED TELECOMM RES INST
Inventor： IIGUSA KIYOUICHI , OHIRA TAKASHI
Abstract: PROBLEM TO BE SOLVED: To converge the control value of an esper antenna in a shorter time in comparison with a conventional case when directing a main beam toward a desired wave and directing a null toward an interference wave in a control method for the esper antenna. SOLUTION: An adaptive control type controller 20 perturbs the reactance values of respective variable reactance elements 12-1 to 12-6 successively just for a prescribed step width, calculates an evaluation function value for each reactance value, sets the reactance value to a perturbed value when improving the evaluation function value calculated before and after perturbation relatively to each variable reactance value but sets the reactance value to a value before the perturbation when not improving the evaluation function value calculated before and after the perturbation on the other hand, and repeatedly carries out processing for decreasing the step width of next repeating processing to the reactance value of the variable reactance element not improving the evaluation function value into 1/q step width change division coefficient and for inverting the code of the relevant step width. COPYRIGHT: (C)2003,JPO
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