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公开(公告)号：DE69517453T2
公开(公告)日：2001-02-08
申请号：DE69517453
申请日：1995-01-12
Applicant: ADVANTEST CORP
Inventor： KITAYOSHI HITOSHI
IPC: G01R29/08 , G01R31/312 , G01S7/02 , G01S7/06 , G01S7/20 , G01S7/295 , G01S13/86 , G01S13/87 , G01S13/89 , G01S15/89 , G01S13/90 , G01R23/163
Abstract: Non-contact type wave signal observation apparatus takes measurements of electromagnetic waves received on an observation plane and performs hologram reconstruction calculations to reconstruct characteristics of the corresponding electromagnetic wave information at points in the observed space. The invention provides apparatus for measuring transfer functions (and, if desired, waveforms) at any point on a network containing a transmission line having distributed properties and having internal signal sources - the processing takes into account fluctuations occurring in the electromagnetic radiation given off by the network. A display for displaying complex three-dimensional data such as interference data of electromagnetic waves may be used to display data produced by the apparatus according to the invention. The complex data is converted from orthogonal co-ordinates to polar co-ordinates, the phase information is converted to hue information in a hue converter and the amplitude information is used to modulate the brightness of the displayed signal; corresponding colour signals are displayed on a colour display unit.
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公开(公告)号：FR2766574B1
公开(公告)日：2000-12-15
申请号：FR9812084
申请日：1998-09-28
Applicant: ADVANTEST CORP
Inventor： KITAYOSHI HITOSHI
Abstract: A hologram observation method capable of accurately estimating a three-dimensional wave source distribution even when a wave source is close to a hologram observation plane. The hologram observation is performed according to a two-frequency hologram observation method to reconstruct a hologram image. A three-dimensional wave source position is obtained from the reconstructed hologram image, a virtual unit wave source is disposed at the obtained wave source position and an observed wave is synthesized. A hologram image obtained from the synthesized observed wave is reconstructed, and a wave source intensity obtained from the measured hologram image is divided by a wave source intensity at the hologram image obtained from the synthesized observed wave, thereby obtaining a true complex amplitude of the wave source. An area having an intensity more than a predetermined value in the hologram image which is obtained from the synthesized observation wave is excluded from a search range, and each of the foregoing steps is executed.
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公开(公告)号：FR2766577B1
公开(公告)日：2000-09-08
申请号：FR9812085
申请日：1998-09-28
Applicant: ADVANTEST CORP
Inventor： KITAYOSHI HITOSHI
Abstract: A hologram observation method capable of accurately estimating a three-dimensional wave source distribution even when a wave source is close to a hologram observation plane. The hologram observation is performed according to a two-frequency hologram observation method to reconstruct a hologram image. A three-dimensional wave source position is obtained from the reconstructed hologram image, a virtual unit wave source is disposed at the obtained wave source position and an observed wave is synthesized. A hologram image obtained from the synthesized observed wave is reconstructed, and a wave source intensity obtained from the measured hologram image is divided by a wave source intensity at the hologram image obtained from the synthesized observed wave, thereby obtaining a true complex amplitude of the wave source. An area having an intensity more than a predetermined value in the hologram image which is obtained from the synthesized observation wave is excluded from a search range, and each of the foregoing steps is executed.
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公开(公告)号：DE69517453D1
公开(公告)日：2000-07-20
申请号：DE69517453
申请日：1995-01-12
Applicant: ADVANTEST CORP
Inventor： KITAYOSHI HITOSHI
IPC: G01R29/08 , G01R31/312 , G01S7/02 , G01S7/06 , G01S7/20 , G01S7/295 , G01S13/86 , G01S13/87 , G01S13/89 , G01S15/89 , G01S13/90 , G01R23/163
Abstract: Non-contact type wave signal observation apparatus takes measurements of electromagnetic waves received on an observation plane and performs hologram reconstruction calculations to reconstruct characteristics of the corresponding electromagnetic wave information at points in the observed space. The invention provides apparatus for measuring transfer functions (and, if desired, waveforms) at any point on a network containing a transmission line having distributed properties and having internal signal sources - the processing takes into account fluctuations occurring in the electromagnetic radiation given off by the network. A display for displaying complex three-dimensional data such as interference data of electromagnetic waves may be used to display data produced by the apparatus according to the invention. The complex data is converted from orthogonal co-ordinates to polar co-ordinates, the phase information is converted to hue information in a hue converter and the amplitude information is used to modulate the brightness of the displayed signal; corresponding colour signals are displayed on a colour display unit.
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公开(公告)号：GB2333604B
公开(公告)日：2000-02-23
申请号：GB9906849
申请日：1998-02-20
Applicant: ADVANTEST CORP
Inventor： KITAYOSHI HITOSHI
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Patent Agency Ranking
公开(公告)号：DE19921888A1
公开(公告)日：1999-12-02
申请号：DE19921888
申请日：1999-05-12
Applicant: ADVANTEST CORP
Inventor： KITAYOSHI HITOSHI
Abstract: The surveillance uses spaced measuring stations within the surveillance area and comparison of the received radio waves at each measuring station with the calculated radio waves which would be received from each direction, accounting for the geographic characteristics of the area, to allow the location of a detected unlicensed radio station to be identified using a computer simulation technique. An Independent claim for a radio broadcast surveillance device is also included.
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公开(公告)号：FR2754362B1
公开(公告)日：1999-11-05
申请号：FR9712418
申请日：1997-10-06
Applicant: ADVANTEST CORP
Inventor： KITAYOSHI HITOSHI
Abstract: The reconstruction region of a hologram reconstructed image is segmented. A fast Fourier transform (FFT) is carried out after multiplying the hologram measurement data V(R) by a weighting function. A fast Fourier transform (FFT) is carried out after multiplying the antenna sensitivity inverse matrix A-1(R'a,b) for each segment by inverse propagation function r'a,bexp(j2 pi r'a,b/ lambda ) to find B-1a,b(s, t), and then multiplying this by a weighting function. After the two FFT outputs are multiplied by each other, inverse fast Fourier transform (IFFT) is carried out. Compensation is performed for the weighting function and the output is made the segment reconstructed image. In addition, radio hologram observation is carried out at two scan surfaces, a horizontal polarization antenna and a vertical polarization antenna are placed at each scan surface, and the voltage vector distribution received by the antennas is stored. The sizes of the error of the reception antenna sensitivity matrix of the vertical polarization reception antenna and the error of the reception antenna sensitivity matrix of the horizontal polarization reception antenna are found, and the received voltage vectors and reception antenna sensitivity inverse matrices are selectively used to find and visualize the three wavesource current vector components.
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公开(公告)号：GB2333604A
公开(公告)日：1999-07-28
申请号：GB9906849
申请日：1998-02-20
Applicant: ADVANTEST CORP
Inventor： KITAYOSHI HITOSHI
Abstract: The method comprises the steps of detecting a direct wave and a reflection wave r from said primary wave source 402 and obtaining three-dimensional coordinates of said primary wave source and an intensity thereof and three-dimensional coordinates of a mirror image wave source 404 in a reflecting surface 403 and an intensity thereof by a two-frequency holographic method, said mirror image wave source 404 corresponding to said reflection wave r; an orientation determination step for obtaining an orientation of a reflection point corresponding to said mirror image wave source when viewed from said primary wave source based on the three-dimensional coordinates of said primary wave source and said mirror image wave source which are obtained in said observation step and based on three-dimensional coordinates of said observation point; and a computing step for computing a directivity of said primary wave source toward a direction of said reflection point, by multiplying a reciprocal number of a reflection coefficient at said reflection point with an intensity of a mirror image wave source corresponding to said reflection point.
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公开(公告)号：GB2333603A
公开(公告)日：1999-07-28
申请号：GB9906847
申请日：1998-02-20
Applicant: ADVANTEST CORP
Inventor： KITAYOSHI HITOSHI
Abstract: A method of displaying a spatially-distributed wave comprising acquiring signals representing the amplitude G 1 ", G 2 " and phase # 1 ", # 2 " of first and second polarisation components of the wave at a plurality of spatial points, applying those signals as inputs to signal processing circuitry to produce screen driver signals, and applying the screen driver signals to a display screen to display for each point an ellipse based on the amplitudes G 1 ", G 2 " and the phases # 1 ", # 2 " at a display point corresponding to the spatial point.
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公开(公告)号：GB2307794B
公开(公告)日：1999-07-28
申请号：GB9624951
申请日：1996-11-29
Applicant: ADVANTEST CORP
Inventor： KITAYOSHI HITOSHI
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