测量目标的距离是雷达的基本任务之一。无线电波在均匀介质中以固定的速度直线传播（在自由空间传播速度约等于光速 km/s）。图2-1雷达位于-Measuring the distance between the target is one of the fundamental tasks of radar. Radio waves in inhomogeneous media in a straight line to a fixed rate of propagation (the propagation velocity in free space equivalent to about the speed of light km/s). Figure 2-1 Radar is located at