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    • 1. 发明专利
    • Dvor device, and method of detecting abnormality in sideband antenna
    • DVOR装置及其检测侧面天线异常的方法
    • JP2008164368A
    • 2008-07-17
    • JP2006352718
    • 2006-12-27
    • Toshiba Corp株式会社東芝
    • TOMINAGA YASUSHI
    • G01S1/38G01S1/40G01S3/04G01S7/40H01Q21/20
    • G01S1/50G01S1/024
    • PROBLEM TO BE SOLVED: To reduce a working expense, to compactify a device scale, and to reduce a cost, without changing a detection function for an antenna generated with abnormality, in a DVOR device.
      SOLUTION: In this DVOR device of the present invention, a main body device 10 is provided with directive couplers 12-1 to 12-4 of the number same to that of sideband transmitters, and a modulation signal generation/antenna monitor circuit 14. Reflected waves form sideband antennas 30-1 to 30-48 are detected by the directive couplers 12-1 to 12-4, a reflection alarm signal is generated from a standing wave ratio signal, based on an electric power level measured by a signal generation circuit 13, and the sideband antenna generated with the abnormality is detected thereafter by comparing the reflection alarm signal with a switching signal by the modulation signal generation/antenna monitor circuit 14.
      COPYRIGHT: (C)2008,JPO&INPIT
    • 要解决的问题:在DVOR设备中,为了降低工作费用,压缩设备规模,降低成本,而不改变产生异常的天线的检测功能。 解决方案:在本发明的DVOR装置中,主体装置10设置有与边带发送器相同数量的指向耦合器12-1至12-4,以及调制信号生成/天线监视电路 由指向耦合器12-1至12-4检测出形成边带天线30-1至30-48的反射波,根据由驻波比信号测得的电功率电平,根据驻波比信号产生反射报警信号 信号发生电路13,并且通过将调制信号生成/天线监视电路14的反射报警信号与切换信号进行比较,检测出异常的边带天线。(C)2008,JPO&INPIT
    • 3. 发明专利
    • PROXIMITY PHASE ERROR COMPENSATION DEVICE IN DOUBLE SIDEBAND DOPPLER VOR
    • JPH06167559A
    • 1994-06-14
    • JP31817392
    • 1992-11-27
    • TOSHIBA TESCO KK
    • TSUNODA HIROTO
    • G01S1/40
    • PURPOSE:To obtain a reception signal without any dip in the amplitude of an FM carrier by compensating a proximity phase error by a reception antenna pattern, a synthesis circuit etc. CONSTITUTION:An upper (lower) sideband wave is radiated from (180) deg. azimuth and a carrier wave is radiated from a rotary center part. A signal S2 obtained by dividing a signal S1 of a flat directivity antenna pattern A into two portions becomes a signal S4 which is Z0/2 times larger and the signal S3 is 1/2 times larger than the signal S1. A signal S5 with a sharp directivity antenna pattern B is n1 (gain ratio of antennas B and A) times larger than the signal S1 and a signal S6 which is obtained by multiplying it by 1/n1.2 is synthesized in inverse phase from the signal S3 to become a signal S7 (=1/2 (S3-S6)) and a signal S8 by phase conversion by the amount of y degrees. A signal S9 which is obtained by synthesizing the signals S4 and S8 becomes 1/2 (S4+S8). When a close-installation monitor position is determined and then Z0 and y related to amplitude and phase are set to proper values in a characteristic expression indicating the amplitude envelope of FM sub carriers, the amplitude results in m0n=n (m0 is an abbreviation 1 in the antenna A). Namely, the amplitude 0.2n becomes n due to compensation, thus eliminating a dip.
    • 4. 发明专利
    • ANTENNA CHANGEOVER FEEDING SYSTEM
    • JPH03267803A
    • 1991-11-28
    • JP6617590
    • 1990-03-16
    • UNYUSHO SENPAKU GIJUTSU KENKYU
    • NIHEI SHIROTANAKA SHUICHI
    • H01Q3/24G01S1/38G01S1/40
    • PURPOSE:To eliminate distortion of a radiation pattern and to reduce production of an undesired wave by connecting a dummy load having an impedance equivalent to an output impedance of a transmitter for each antenna at the terminal of a changeover feeding circuit and terminating each antenna at nonconduction with the dummy load. CONSTITUTION:A dummy load having an impedance equivalent to an output impedance of a transmitter is connected for each antenna to an antenna terminal of a changeover feeding circuit to select plural antennas sequentially to be opened and each antenna at non-conductive state is terminated by the bummy load, in the antenna changeover feeding system for a doppler VOR side band antenna especially which is useful for the antenna changeover feeding system selecting plural antennas sequentially to be opened and closed, and each antenna in the open state is terminated by the dummy load. Thus, production of an undesired wave or distortion in the radiation pattern due to a change in the impedance at the closing and opening of the antenna is eliminated and the adjustment of a cable in the side wave band antenna is avoided.