公开(公告)号：GB2345347B

公开(公告)日：2000-08-16

申请号：GB0003348

申请日：1998-02-20

Applicant: ADVANTEST CORP

Inventor： KITAYOSHI HITOSHI

IPC: G01R29/08 ,  G01R29/10

公开(公告)号：GB2333603B

公开(公告)日：2000-05-17

申请号：GB9906847

申请日：1998-02-20

Applicant: ADVANTEST CORP

Inventor： KITAYOSHI HITOSHI

IPC: G03H1/00 ,  G01R29/08

公开(公告)号：DE19917661A1

公开(公告)日：1999-10-28

申请号：DE19917661

申请日：1999-04-19

Applicant: ADVANTEST CORP

Inventor： KITAYOSHI HITOSHI

IPC: G01R29/08 ,  G01R29/10

Abstract: The method involves measuring an object shape distribution of a communications unit with integral antenna under investigation using a sensor for measuring a three-dimensional shape and measuring a scan distribution of complex interference data between a signal obtained with a scanning measurement antenna for measuring a two-dimensional distribution of an electromagnetic wave and a signal acquired with a measurement antenna, whose relative arrangement with respect to the measurement object is fixed, as a two-dimensional distribution of an electric or magnetic field, based on a movement with a predefined step size as a minimal movement unit. The superimposed distributions are displayed and a complex current distribution derived. The alignment capability is derived from the object shape distribution and complex current distribution. An Independent claim is also included for an method using the apparatus.

公开(公告)号：GB2318941A

公开(公告)日：1998-05-06

申请号：GB9721153

申请日：1997-10-06

Applicant: ADVANTEST CORP

Inventor： KITAYOSHI HITOSHI

IPC: G01R13/40 ,  G01R29/08 ,  G01S13/89 ,  G01S7/02

Abstract: The invention concerns a method of numerically reconstructing a radio hologram using fast Fourier transforms (FFTs) which involve fewer computations. Hologram measurement data V(R) is multiplied by a weighting function (S1) and a first fast Fourier transform (FFT) is performed on the result (S2). An antenna sensitivity inverse matrix is multiplied by an inverse propagation function (S4) for each segment of a segmented hologram reconstruction region, the result multiplied by a weighting function (S5), and a second FFT carried out (S6). The two FFT outputs are multiplied and an inverse fast Fourier transform (IFFT) performed (S8). Compensation is performed for the weighting functions (S9, S10) and a hologram reconstructed image obtained (S12). Also disclosed is a method of radio hologram observation which is carried out at two scan surfaces using horizontally and vertically polarized antennae at each scan surface (see figure 12).

公开(公告)号：DE19917661B4

公开(公告)日：2007-02-15

申请号：DE19917661

申请日：1999-04-19

Applicant: ADVANTEST CORP

Inventor： KITAYOSHI HITOSHI

IPC: G01R29/10 ,  G01R29/08

公开(公告)号：FR2762396B1

公开(公告)日：2000-12-01

申请号：FR9802081

申请日：1998-02-20

Applicant: ADVANTEST CORP

Inventor： KITAYOSHI HITOSHI

IPC: G01R29/10 ,  G03H3/00 ,  G03H5/00

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.

公开(公告)号：DE4417406C2

公开(公告)日：2000-09-28

申请号：DE4417406

申请日：1994-05-18

Applicant: ADVANTEST CORP

Inventor： KITAYOSHI HITOSHI

IPC: G01R23/16 ,  G01R23/18

公开(公告)号：GB2345347A

公开(公告)日：2000-07-05

申请号：GB0003348

申请日：1998-02-20

Applicant: ADVANTEST CORP

Inventor： KITAYOSHI HITOSHI

IPC: G01R29/08 ,  G01R29/10

Abstract: A method of displaying a spatially-distributed wave comprising acquiring signals representing the amplitude G 1 '', G 2 '' and phase r 1 '', r 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 r 1 '', r 2 '' at a display point corresponding to the spatial point.

公开(公告)号：GB2323674B

公开(公告)日：2000-02-23

申请号：GB9803692

申请日：1998-02-20

Applicant: ADVANTEST CORP

Inventor： KITAYOSHI HITOSHI

IPC: G01R29/10 ,  G03H3/00 ,  G03H5/00 ,  G01R29/08

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.

公开(公告)号：DE19921947A1

公开(公告)日：2000-01-05

申请号：DE19921947

申请日：1999-05-12

Applicant: ADVANTEST CORP

Inventor： KITAYOSHI HITOSHI

IPC: G03H5/00 ,  G01S3/36 ,  G01S3/58 ,  G01S3/74 ,  H04B7/08 ,  H04B17/00 ,  G01R29/10

Abstract: A signal received with scanning antenna (23) for every fixed antenna and signal received with fixed antenna (21), are made to interfere. This results in a complex scanning data matrix with which complex weighting addition process is performed to reproduce surface distribution of source of EM wave emission. Several fixed antennas (21) are positioned along different directions. The scanning antenna performs scanning of fixed antenna in predetermined path. Weight coefficient for every fixed antenna obtained from complex weighting addition process isolates electromagnetic wave emitted in same frequency band, from different sources. An Independent claim is also included for electromagnetic wave distribution visualization apparatus.