TARGET VELOCITY IDENTIFICATION APPARATUS, TARGET VELOCITY IDENTIFICATION PROGRAM, AND TARGET VELOCITY IDENTIFICATION METHOD

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 v_P of a SAR platform, a distance R₀, an wavelength λ of an electric wave, and a synthetic aperture time τ being observation conditions of SAR image data to a function of an amplitude value V₀^vaz expressed by the velocity v_P of the SAR platform, the distance R₀, the wavelength λ of the electric wave, the synthetic aperture time τ, and a predicted velocity v_a′ of the target in an azimuth direction to compute the amplitude value V₀^vaz corresponding to the predicted velocity v_a′. The step size determination unit 3 identifies a range of the predicted velocity v_a′ in the azimuth direction where the amplitude value V₀^vaz 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 Δv_a1. An identification process execution unit identifies the velocity of the target in the azimuth direction by the processing device, using the step size Δv_a1.