A basic assumption concerning source motion is to consider it to be of constant velocity with random perturbations over the observation intervals.
目标运动的基本假设是在一段观测时间中保持常速度，并有随机速度扰动。
A basic assumption concerning source motion is to consider it to be of constant velocity with random perturbations over the observation intervals.
目标运动的基本假设是在一段观测时间中保持常速度，并有随机速度扰动。
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