Non-contact type wave signal observation apparatus
First Claim
1. A non-contact type transfer function measurement apparatus which provides an input signal to an input terminal of a distributed constant network under observation, comprising:
- scanning-antenna receiving means for receiving electromagnetic waves radiated from said network at a number of observation points on an electromagnetic wave observation plane facing said network;
transfer function measuring means for measuring transfer functions between said input terminal of said network and said observation points;
transfer function conversion means for converting said transfer functions between said input terminal and said observation points of said network at each observation frequency of said input signal using an inverse-Fresnel transform process or Fourier transform process;
display means for displaying said converted transfer functions as frequency responses in said network.
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Abstract
A non-contact type wave signal observation apparatus measures transfer functions of a distributed constant network. A signal is input from a network analyzer to the network to be measured. Electromagnetic waves radiated from the network are received at each observation point on an observation plane arranged in a manner facing the network. The received signals are input to the network analyzer. The transfer functions between an input terminal of the network and each observation point are measured by the network analyzer. The measured transfer functions are converted by an inverse-Fresnel transformer and are stored in memories. The stored data is specified by a control unit and is displayed on a display unit. The stored data can be converted by an inverse-Fourier transformer and is displayed on the display unit as waveforms. Further aspect of the apparatus is, by a non-contact method, to measure signals of a distributed constant network, to determine states of electromagnetic wave in the space, to decrease the amount of calculations in a hologram reconstruction process, and to display a complex three dimensional illustration for a holographic radar.
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Citations
30 Claims
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1. A non-contact type transfer function measurement apparatus which provides an input signal to an input terminal of a distributed constant network under observation, comprising:
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scanning-antenna receiving means for receiving electromagnetic waves radiated from said network at a number of observation points on an electromagnetic wave observation plane facing said network; transfer function measuring means for measuring transfer functions between said input terminal of said network and said observation points; transfer function conversion means for converting said transfer functions between said input terminal and said observation points of said network at each observation frequency of said input signal using an inverse-Fresnel transform process or Fourier transform process; display means for displaying said converted transfer functions as frequency responses in said network. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A non-contact type signal observation apparatus which observes signals at a number of observation points on an electromagnetic wave observation plane which faces a distributed constant network under observation, comprising:
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scanning-antenna receiving means for receiving a repetition signal from said network; means for generating a pulse signal synchronized with said repetition signal; complex voltage converting means for converting said received signal to complex voltages based on the phase of said pulse signal at each observation frequency of said received signal; means for converting said complex voltages to image data using an inverse-Fresnel transform process or a Fourier transform process; display means for displaying said image data as spectra or waveforms. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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16. A spatial electromagnetic wave analysis apparatus which receives spatial electromagnetic waves at a number of observation points of an electromagnetic wave observation plane, and analyzes states of electromagnetic waves in a space, comprising:
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scanning-antenna receiving means for receiving electromagnetic waves at said observation points by an antenna-element pair with mutually orthogonal 8-figured beam patterns; complex signal converting means for converting received signals of said antenna-element pair to complex signals respectively; reference signal receiving means for receiving a reference signal in said electromagnetic waves which is used as a reference phase for said received signals; means for converting said reference signal to a reference complex signal; means for calculating interference data of orthogonal polarized wave components of said received signals by dividing said complex signal by said reference complex signal; means for calculating holograms using hologram reconstruction calculations of said interference data over said observation plane; means for calculating polarized wave vectors which include results of said hologram calculations in vertical and horizontal components of elliptically polarized waves, at said observation points in said space; display means for displaying parameters of said polarized wave vectors at said observation points. - View Dependent Claims (17, 18, 19, 20, 21)
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22. A holographic radar comprising:
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means for radiating electromagnetic waves generated from a high frequency signal modulated by a pulse signal toward an object in a space; scanning-antenna receiving means for receiving reflected waves from said object at a number of observation points on a hologram observation plane and for outputting received signals; means for quadrature-detecting said received signals using said high frequency signal; means for sampling said quadrature-detected signals by a sampling pulse signal synchronized with said pulse signal; means for performing hologram reconstruction calculations on said sampled signal with respect to each of said observation points of said hologram observation plane; variable delay means for delaying said sampling pulse signal by a delay value before supplying to said sampling means; display means for displaying results of said hologram reconstruction calculations relative to said delay value in a three dimension form. - View Dependent Claims (23, 24, 25)
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26. A holographic radar comprising:
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means for radiating electromagnetic waves generated from a high frequency signal modulated by a pulse signal toward an object in a space; scanning-antenna receiving means for receiving reflected waves from said object at a number of observation points on a hologram observation plane and for outputting received signals; means for converting said received signals to low frequency signals; means for sampling said low frequency signals in synchronism with said pulse signal by a sampling pulse signal having a frequency more than two times higher than that of said low frequency signals; means for converting a fixed number of data produced by said sampling means which are delayed by a specified delay value through a discrete Fourier transform process; means for performing hologram reconstruction calculations on results of said discrete Fourier transform process with respect to each of said observation points on said hologram observation plane; display means for displaying results of said hologram reconstruction calculations relative to said delay value in a three dimension form.
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27. A complex wave interference information display apparatus comprising:
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interference data observing means for observing complex two-dimensional wave interference data; means for performing hologram reconstruction calculations of said interference data; means for converting coordinates of results of said hologram reconstruction calculations from orthogonal to polar coordinates; means for converting phase information in polar coordinates data obtained by said converting means to hue information; means for modulating said hue information by amplitude information in said polar coordinates data; display means for displaying said modulated data as a two-dimensional color image. - View Dependent Claims (28, 29, 30)
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Specification