Radar video creation apparatus and method
First Claim
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1. A radar video creation apparatus comprising:
- a processor to execute a program; and
a memory to store the program which, when executed by the processor, performs processes of;
transforming a synthetic aperture radar image into components in a Doppler frequency band, the synthetic aperture radar image being created from observed data of a radar apparatus;
cutting out a plurality of series of sub-band components from the transformed components in the Doppler frequency band;
respectively transforming the cut-out plurality of series of sub-band components into a plurality of time-domain images;
extracting, for each area irradiated with a beam by the radar apparatus, a pixel sequence corresponding to the irradiated area from each of the transformed plurality of time-domain images, and collecting the plurality of extracted pixel sequences to construct images for video; and
playing back the images for video in turn, the images for video being constructed for the respective areas irradiated with a beam,wherein the processor calculates from a bandwidth of the sub-band components an observation time difference between adjacent sub-band components, and determines a frame rate from an inverse of the observation time difference for use in playing back the images for video.
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Abstract
There are provided an azimuth Fourier transform unit that transforms a SAR image into components in a Doppler frequency band, a band cutting-out unit that cuts out sub-band components from the components in the Doppler frequency band, and an azimuth inverse Fourier transform unit that transforms the sub-band components into sub-images, respectively. An image reconstructing unit extracts, for each area irradiated with a beam, a pixel sequence corresponding to the irradiated area from each of the sub-images, and collects the plurality of extracted pixel sequences to construct images for video.
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Citations
8 Claims
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1. A radar video creation apparatus comprising:
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a processor to execute a program; and a memory to store the program which, when executed by the processor, performs processes of; transforming a synthetic aperture radar image into components in a Doppler frequency band, the synthetic aperture radar image being created from observed data of a radar apparatus; cutting out a plurality of series of sub-band components from the transformed components in the Doppler frequency band; respectively transforming the cut-out plurality of series of sub-band components into a plurality of time-domain images; extracting, for each area irradiated with a beam by the radar apparatus, a pixel sequence corresponding to the irradiated area from each of the transformed plurality of time-domain images, and collecting the plurality of extracted pixel sequences to construct images for video; and playing back the images for video in turn, the images for video being constructed for the respective areas irradiated with a beam, wherein the processor calculates from a bandwidth of the sub-band components an observation time difference between adjacent sub-band components, and determines a frame rate from an inverse of the observation time difference for use in playing back the images for video. - View Dependent Claims (2, 3)
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4. A radar video creation apparatus comprising:
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a processor to execute a program; and a memory to store the program which, when executed by the processor, performs processes of; transforming a synthetic aperture radar image into components in a Doppler frequency band, the synthetic aperture radar image being created from observed data of a radar apparatus; cutting out a plurality of series of sub-band components from the transformed components in the Doppler frequency band; respectively transforming the cut-out plurality of series of sub-band components into a plurality of time-domain images as images for video; and playing back the images for video in turn, the images for video being the transformed plurality of time-domain images, wherein the processor calculates from a bandwidth of the sub-band components an observation time difference between adjacent sub-band components, and determines a frame rate from an inverse of the observation time difference for use in playing back the images for video. - View Dependent Claims (5, 6)
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7. A radar video creation method comprising:
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transforming a synthetic aperture radar image into components in a Doppler frequency band, the synthetic aperture radar image being created from observed data of a radar apparatus; cutting out a plurality of series of sub-band components from the transformed components in the Doppler frequency band; transforming the cut-out plurality of series of sub-band components into a plurality of time-domain images, respectively; extracting, for each area irradiated with a beam by the radar apparatus, a pixel sequence corresponding to the irradiated area from each of the transformed plurality of time-domain images, and collecting the plurality of extracted pixel sequences to construct images for video; and playing back the images for video in turn, the images for video being the transformed plurality of time-domain images, wherein an observation time difference between adjacent sub-band components are calculated from a bandwidth of the sub-band components, and a frame rate is determined from an inverse of the observation time difference for use in playing back the images for video.
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8. A radar video creation method comprising:
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transforming a synthetic aperture radar image into components in a Doppler frequency band, the synthetic aperture radar image being created from observed data of a radar apparatus; cutting out a plurality of series of sub-band components from the transformed components in the Doppler frequency band; transforming the cut-out plurality of series of sub-band components into a plurality of time-domain images as images for video, respectively; and playing back the images for video in turn, the images for video being the transformed plurality of time-domain images, wherein an observation time difference between adjacent sub-band components are calculated from a bandwidth of the sub-band components, and a frame rate is determined from an inverse of the observation time difference for use in playing back the images for video.
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Specification