一种表面波衰减率测量方法研究
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中国航发北京航空材料研究院 北京 100095

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TN98

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Research on a surface wave attenuation rate measurement method
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    摘要:

    介绍了雷达吸波材料表面波衰减率的重要性以及测量方法,从雷达方程入手分析出近场条件下测量雷达散射截面(RCS)的各影响因素,通过分析得出发射天线和接收天线的波束宽度和间距成为近场测量RCS的重要误差来源。提出了增大方向图1dB波束宽度并减小发射天线和接收天线间距来减小测量误差的方案,设计制作了8-12GHz圆锥喇叭天线,具有良好的圆对称性,1dB波束宽度达到22°。组建了近场RCS测试系统,使用金属立方体作为目标开展了测试系统验证试验,与理论值相比RCS曲线峰值之差小于0.5dB,平均值之差小于0.2dB,具有比较高的测量精度。使用组建的近场RCS测试系统开展表面波衰减率测量试验,与紧缩场测量结果之差为0.38dB,实现了近场条件下表面波衰减率的准确测量。

    Abstract:

    This paper introduces the importance of surface wave attenuation rate of radar absorbing materials and its measuring method. Using the radar equation, this paper analyzes the influencing factors by the measurement of radar scattering cross section under near-field conditions. The antenna beam width and spacing between transmitting antenna and receiving antenna are important error sources of radar cross section measurement. A scheme is proposed to reduce the measurement error by increasing the 1 dB beam width of the direction diagram and reducing the distance between the transmitting antenna and the receiving antenna. The 8-12 GHz conical horn antenna is designed and manufactured. The antenna has good circular symmetry, and the 1 dB beam width reaches 22°. A near-field RCS measurement system is set up,validation experiments of the system is conducted with metal cube. Compared to theoretical values,the difference of the RCS curve peak values are less than 0.5 dB, and the difference of the RCS curve average values are less than 0.2 dB. It can been seen that the system has a relatively high measurement accuracy. Then the surface wave attenuation rate experiments are conducted with the near-field RCS measurement system, the difference of the measurement result between near-field RCS measurement system and compact range is 0.38 dB, so the measurement method of this paper can accurately measure surface wave attenuation rate under near-field conditions.

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  • 收稿日期:2024-04-01
  • 最后修改日期:2024-07-08
  • 录用日期:2024-07-09
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