多通道基带回波模拟器单元级回波仿真与验证

Simulation and Validation on Multi-Channel Baseband Echo Simulator

为了高效验证数字阵列雷达DBF及后端信号数据处理功能及指标测试,设计光纤接口的宽带多通道基带回波模拟器有了迫切需求。针对此,描述了模拟器回波产生需要的发射信号产生、目标RCS波动、地杂波、收发天线等算法。然后将仿真得到的单元回波进行脉压、DBF、单脉冲测角、测速、CFAR处理获得的目标运动参数与场景设置值进行误差分析。最后与实测雷达数据进行比对,观察杂波的分布特性,进一步验证了回波数据的高逼真度,满足雷达联调使用。

A multichannel wideband baseband echo simulator with fibred interface is developed to validate the functions and test the specifications of signal and data processing subsystems in laboratory. The key models including signal generation, beam former, clutter and target RCS fluctuation which are needed to generate the target echo received by array elements are de-scribed. Then the targets are detected from the simulated echo using the signal processing algo-rithms involving pulse compression, DBF, mono pulse angle-sensing, pulse Doppler velocity measurement and CFAR. The target’ s parameters including distance, angle and velocity are compared with the setting values to get the errors. At last the simulated raw video signal is com-pared with the measured target echo. The result shows that simulated echo with high fidelity can be used with actual equipment during system debugging.