一种浮空器雷达频率源/激励产生器及改善因子分析

为浮空器雷达设计的一种频率源/激励产生器,采用频率源直接合成和DDS波形产生技术,具有本振频率捷变、低相噪和激励信号高信杂比。给出了本振相位噪声测试数据;分析了本振相位噪声和激励信号信杂比对雷达系统改善因子的限制;提出了为满足现代PD雷达强杂波下低空动目标探测性能,降低本振相噪和提高激励信号信杂比的方法。

a frequency synthesizer/exciter which employ DS（direct synthesis） and DDS（digital direct synthesis） waveform generation techniques is designed to achieve frequency agility of LO（local oscillator）,low phase noise and high SIR（signal interference ratio） of exciting signal for a aerostat-borne radar.Test dada of the LO phase noise is showed in the paper.Meanwhile,the effects of LO phase noise and SIR of exciting signal on improvement factor is analyzed.In addition,a method which could satisfy the performance of low altitude MTI（moving target indication） for a modern PD radar within strong clutter circumstance,and which could reduce the LO phase noise and improve the exciting signal SIR is also proposed.