船载雷达伺服系统带宽测试方法研究

Research on Bandwidth Test Method of Ship-borne Radar Servo System

带宽是船载雷达伺服系统的重要指标,反映了系统的动态性能和跟踪性能;工程经验公式估算带宽的方法平滑了时域响应曲线的锯齿状波动,估算结果比实际值偏大;针对这种情况,提出了一种基于阶跃响应和傅里叶变换的带宽计算方法,只需一次阶跃响应即可获取系统的频率特性从而计算系统带宽,由于不需要额外的激励信号,测试过程较为简单,仿真和试验结果表明测试结果与理论结果更为接近。

The bandwidth is an important characteristic of ship-borne radar servo system,which reflected dynamic characteristic and tracking characteristic.The wave on the time respond curve was smoothed by engineering experience formula,so the result was bigger than real value.According to this situation,this paper proposed a new test method based on step respond and fast fourier transform（FFT）,which only need once step respond can getting object frequency characteristic and computing system bandwidth.Because of this method didn＇t need additional inspirit signal,so the test process was simpler.Simulation and experimental results show that the result was close to real value.