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 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 V0vaz expressed by the velocity vP of the SAR platform, the distance R0, the wavelength λ of the electric wave, the synthetic aperture time τ, 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 Δva1. An identification process execution unit identifies the velocity of the target in the azimuth direction by the processing device, using the step size Δva1.
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机译:本发明的目的是以高精度和少量的计算来识别目标的速度。步长确定单元 3 B>输入SAR平台的速度v P Sub>,距离R 0 Sub>,电波的波长λ, SAR图像数据观测条件的合成孔径时间τ是由速度v P Sub>表示的振幅值V 0 Sub> vaz Sup>的函数SAR平台的距离,距离R 0 Sub>,电波的波长λ,合成孔径时间τ和目标在空中的目标速度v a Sub>'。方位角方向来计算与预测速度v a Sub>'相对应的振幅值V 0 Sub> vaz Sup>。步长确定单元 3 B>在幅度值V 0 Sub> 的方位角方向上确定预测速度v a Sub>'的范围vaz Sup>使用处理设备成为预定值或更高,然后将等于或小于所识别范围的速度宽度的速度宽度设置为步长Δv a1 Sub>。识别处理执行单元使用步长Δv a1 Sub>通过处理装置识别目标在方位方向上的速度。
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