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| primary radar (仅仅依靠发射电磁波,从目标反射的雷达。一次雷达以距离和方位角来指示目标位置。也可以用它指示高度。然而，一次雷达不能给出其他用于识别的信息，因为它不包含应答机数据。一次雷达的作用范围取决于发射能量及反射物体和脉冲重复频率 (PRF )的特性) | |||
| 一次 雷 达: 4 phrases in 2 subjects |
| Air defense | 3 |
| Aviation | 1 |
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