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在航海和航空导航中,雷达对周围感兴趣的目标有不受阻碍的视野。在舰载雷达的情况中,视野不受阻碍是因为无线电可以装在桅杆之上比正常波高足够高,而且还因为一切感兴趣的目标都在波面以上。在机载雷达的情况中,由于天线高度关系,视野显然不会受到阻碍。然而在陆地导航中,由于雷达天线装在地面车辆的顶上,附近的建筑物、树林或山峦将阻碍雷达视野,并且由车辆位置引起的地面斜度可能使雷达荧光屏显示充满连续的回波,这些回波叫地面杂波,它能将感兴趣的小目标掩蔽起来。航海、航空和地面车辆用雷达的主要优点是可以在夜间和低能见度条件下,例如在降雾和烟雾中操作。
In sailing and aeronautical navigation, the radar has an unhindered view of the target of interest around it. In the case of a shipborne radar, the field of view is not hindered because the radio can be mounted above the mast sufficiently higher than normal and also because all the objects of interest are above the wavefront. In the case of airborne radars, the field of view is clearly not hindered due to the antenna height. However, in land navigation, as the radar antenna is mounted on top of the ground vehicle, nearby buildings, woods or mountains will hinder the radar field of view and the ground slope caused by the vehicle’s position may render the radar screen full of continuous echoes, These echoes are terrestrial clutter, which masks small targets of interest. The main advantage of nautical, aeronautical and ground vehicle radars is their ability to operate at night and in low visibility conditions, such as fog and smoke.