Amiri, Amin and Brennan, Paul V. and Lok, Lai Bun (2017) Development of a UHF transponder for geological monitoring of boreholes drilled through ice sheets using phase-sensitive FMCW radar. In: 2017 IEEE MTT-S International Microwave Symposium, IMS 2017 :. Institute of Electrical and Electronics Engineers Inc., USA, pp. 1746-1749. ISBN 9781509063604
Brennan_PID4678901.pdf - Accepted Version
Available under License Creative Commons Attribution-NonCommercial.
Download (506kB)
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.