| 摘要 |
An object of the present invention is to identify the velocity of a target with high precision and with a small amount of computation. A step size determination unit 3 inputs a velocity vP of a SAR platform, a distance R0, an wavelength lambda of an electric wave, and a synthetic aperture time tau being observation conditions of SAR image data to a function of an amplitude value V0vaz expressed by the velocity vP of the SAR platform, the distance R0, the wavelength lambda of the electric wave, the synthetic aperture time tau, and a predicted velocity va' of the target in an azimuth direction to compute the amplitude value V0vaz corresponding to the predicted velocity va'. The step size determination unit 3 identifies a range of the predicted velocity va' in the azimuth direction where the amplitude value V0vaz becomes a predetermined value or higher, using a processing device, and then sets a velocity width equal to or smaller than a velocity width of the identified range to a step size Deltava1. An identification process execution unit identifies the velocity of the target in the azimuth direction by the processing device, using the step size Deltava1.
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