Development of a UHF transponder for geological monitoring of boreholes drilled through ice sheets using phase-sensitive FMCW radar

A. Amiri, P. Brennan, L. B. Lok
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Abstract

This paper presents an active UHF transponder designed for geological monitoring of boreholes drilled through ice sheets. It forms part of a phase-sensitive frequency modulated continuous wave (FMCW) radar system to measure the horizontal position of a borehole with depth. To distinguish the transponder response from stationary clutter, the transponder modulates the received signal before re-transmission to the surface radars. The transponder operates from 292 to 492 MHz with a gain around 18 dB. The transponder employs two novel antennas optimized for deployment within a 15 cm diameter borehole. The simulation and indoor laboratory measurement results of the transponder design are presented.
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利用相敏FMCW雷达对冰原钻孔进行地质监测的超高频应答器的研制
本文介绍了一种用于冰层钻孔地质监测的有源超高频应答器。它是相敏调频连续波(FMCW)雷达系统的一部分,用于测量井眼的水平位置和深度。为了将应答器响应与静止杂波区分开来,应答器在重新发送到地面雷达之前对接收到的信号进行调制。转发器工作在292到492mhz之间,增益约为18db。应答器采用了两个新型天线,优化后可部署在直径为15厘米的井眼内。给出了应答器设计的仿真结果和室内实验室测量结果。
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