在实际工程中,系统误差会严重影响数字阵列雷达系统的性能。为了掌握误差对系统的影响规律,文中基于实际的子阵级数字波束形成(DBF)雷达系统,建立了子阵级DBF系统接收模型,并针对阵面安装误差、子阵级和阵元级通道误差建立了误差信号模型,并以方向图和测角精度为指标,分析了单一误差对数字阵列雷达系统性能的影响以及三种误差对系统性能的综合影响。最后,基于某车载雷达实测方向图数据和测角数据对模型进行了验证,验证结果表明该模型具有高准确度。文中提出的模型可以添加多种误差模型进行分析,可以对实际工程应用提供理论参考与指导。

System errors will seriously affect the performance of digital array radar systems in practical applications. In order to grasp the influence of errors on the system, this paper, based on the actual sub-array DBF radar system, establishes a sub-array DBF system receiving model and error signals models of the array installation error, sub-array and element-level channel error. Using directional patterns and angle measurement accuracy as indicators, this paper analyzes the influence of a single error on the digital radar system and the combined effect of three errors on the system. Finally, the model was verified based on the measured pattern data and angle measurement data of a vehicle radar. The verification result shows that the model has high accuracy. The model proposed in this paper can add a variety of error models for analysis, so this system model can provide theoretical references and guidance for practical engineering applications.

TN957