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本文所介绍的雷达利用全向天线发射低截获概率 (LPI) 波形,因而称作全向低截获概率 (OLPI) 雷达。为了回收所有方向上的发射能量,必需有一个多波束接收机,这种接收机对每个波束都有一个信号处理通道。这就必须在极短时间内 (例如,2秒钟内) 完成信号积累,才能从连续波编码估计出目标距离,并抑制杂波回波。利用旋翼桨叶的短暂回波就可实现对悬停直升机的探测,这是因为这类回波不会被动目标显示器所对消。连续波照射产生的是所有旋翼闪烁的回波。这样,除了探测之外,还可通过估计闪烁周期来进行目标分类。
The radar introduced in this paper uses the omnidirectional antenna to transmit low intercept probability (LPI) waveforms and is therefore called the Omni-directional Low Intercept Probability (OLPI) radar. In order to recover the transmitted energy in all directions, it is necessary to have a multi-beam receiver which has a signal processing channel for each beam. This necessitates the signal accumulation in a very short period of time (eg, within 2 seconds) to estimate the target distance from continuous wave coding and suppress clutter echoes. The detection of hovering helicopters can be accomplished with the brief echo of the rotor blades because these types of echoes are not canceled by passive target displays. Continuous wave irradiation produces all flashes of rotors echoes. In this way, in addition to sounding, the classification of the target can also be done by estimating the blinking period.