摘要:
低频探地雷达系统多配置无屏蔽天线,抗干扰能力差.针对中心频率15 MHz的低频探地雷达天线,以铁丝网作为屏蔽材料,设计制作了3种尺寸(长×宽×高分别为:12 m×12 m×5 m、11 m×11 m×5m、9.6 m×9.6 m×5 m)的屏蔽装置,对接收天线和发射天线分别进行了屏蔽干扰实验研究.结果表明:网孔为1 cm×1 cm,丝径t为0.15 cm铁丝网是制作屏蔽装置的有效材料;对接收天线单独进行电磁屏蔽时,三种尺寸的屏蔽装置均显示出较好的屏蔽效果,其中最佳尺寸为11 m×11 m×5 m;对发射天线单独进行电磁屏蔽时,只有11m×11m×5m尺寸的屏蔽装置最有效,另外两种尺寸的装置屏蔽效果相对较差;相对而言,给接收天线单独增加屏蔽装置要比单独给发射天线增加屏蔽装置好.实验结果为下一步研发实用化的低频探地雷达屏蔽装置打下了良好基础.
Abstract:
The low frequency ground penetrating radar system is equipped with unshielded antenna and poor anti-jamming capability.For the low frequency ground penetrating radar with a center frequency of 15MHz,the authors designed and manufactured three different sizes of shielding devices (length×width×height:12 m× 12 m×5 m,11 m× 11 m×5 m,9.6 m×9.6 m×5 m) with the iron wire mesh as the shielding material.The experimental research on shielding interference of the receiving antenna and the transmitting antenna of low-frequency ground penetrating radar was carded out respectively.When electromagnetic shielding experiment was carried out separately for the receiving antenna,the shielding devices of the three sizes showed better shielding effect,and the optimal size was 11 m× 11 m×5 m.When the electromagnetic shielding experiment was carried out separately for the transmitting antenna,only the shielding device of 11m×11m×5m was the most effective,and the shielding effect of the other two devices was relatively poor.In contrast,it was better to add a separate shielding device to the receiving antenna than to add a separate shielding device to the transmitting antenna.The experimental results have laid a solid foundation for future research and development of the practical shielding device of low frequency ground penetrating radar.
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