OBSERVATION DEVICE, OBSERVATION METHOD, AND PROGRAM

[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.