| 摘要 |
PCT No. PCT/JP96/00110 Sec. 371 Date Dec. 18, 1996 Sec. 102(e) Date Dec. 18, 1996 PCT Filed Jan. 23, 1996 PCT Pub. No. WO96/23363 PCT Pub. Date Aug. 1, 1996Radio waves having frequencies f1 and f2 are radiated to the premises where a wireless LAN is to be constructed. The radio waves of f1 and f2 are received by an antenna for scanning the observation plane and a fixed antenna, respectively. Then, the radio wave holograms of the respective radio waves are produced, from which are constructed radio wave source images separated into respective paths. The difference between these source images is found, and then the amplitude and the delay for each path are found. A propagation time response function x(t) of each path is found from the corresponding amplitude, delay and the directivity characteristics of the corresponding antenna, and then the real part and the imaginary part of each time response function are convoluted into a modulated carrier wave signal y(t). The convoluted results are multiplied by the in-phase component Rf and the quadrature component Rf* of an unmodulated carrier wave, respectively. Then, the multiplied results are summed to obtain a demodulated base band signal gamma (t). Also, a radio wave delay time of each secondary radio wave source image to the primary wave source is found. The radio wave source image is re-positioned in a three-dimensional absolute coordinate using the radio wave delay time. At an arbitrary position in the absolute coordinate, the radio waves from the respective radio wave source images are composited to find the strength. Also, a mean delay and a standard deviation of the delay are found from the delay times and the strength attenuations in accordance with the distances to each radio wave source image.
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