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公开(公告)号：EP4350893A1
公开(公告)日：2024-04-10
申请号：EP22773095.9
申请日：2022-03-10
Applicant: Japan Aerospace Exploration Agency
Inventor： SEZAI, Toshihiro
Abstract: An antenna according to an embodiment of the present invention includes a primary radiator and a reflector mirror. The primary radiator radiates radio waves. The reflector mirror reflects radio waves radiated from the primary radiator, has same aperture diameter and height as a parabolic reflector mirror whose aperture diameter is equal to or less than 1.7 times a wavelength of the radio waves, and has a non-parabolic surface as a mirror surface shape.
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公开(公告)号：EP4116736A1
公开(公告)日：2023-01-11
申请号：EP21889300.6
申请日：2021-11-08
Applicant: Japan Aerospace Exploration Agency
Inventor： SEZAI, Toshihiro
Abstract: A range measurement device includes a signal processor configured to fit a signal, which is obtained by inverse correlating in frequency domain echo waves which are reflected by targets and returned with pulse waves which are frequency-modulated and transmitted toward the targets, with exponential functions whose arguments have real parts and imaginary parts using Prony method.
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公开(公告)号：EP3865893A1
公开(公告)日：2021-08-18
申请号：EP19872108.6
申请日：2019-02-20
Applicant: Japan Aerospace Exploration Agency
Inventor： SEZAI, Toshihiro
Abstract: [Object] To provide an observation apparatus, an observation method, and a program that are capable of directly obtaining radio wave source information by using a deconvolution method and Prony's method, without using the phase of an electric field signal received by an antenna.
[Solving Means] An observation apparatus 10 includes a signal processing unit 15 that performs, using a square root signal of a received electric power signal from an antenna whose beam is scanned within a predetermined azimuthal angle range and a signal of an azimuthal angle of the scanned beam, a Fourier transform with respect to the azimuthal angle on the square root signal, divides a first azimuth frequency signal by a second azimuth frequency signal, the first azimuth frequency signal being obtained by performing the Fourier transform, the second azimuth frequency signal being obtained by performing a Fourier transform with respect to the azimuthal angle on a square root signal of an antenna electric power pattern or an antenna electric field pattern signal of the antenna, and fits the divided signal with exponential functions including real parts and imaginary parts in arguments by using Prony's method.
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