| 摘要 |
<p>The invention provides an underground cavity monitoring system (CMS). The CMS uses a radar system operating in the millimetre wavelength band. The radar system includes a transmitter for generating a modulated electromagnetic waveform, transmit and receive antennas housed in and antenna module (10) for respectively radiating the waveform into space toward a distant object and receiving the waveform reflected from the distant object, and a receiver for measuring the amplitude of the reflected waveform and determining the time delay between the transmitting of the waveform and receiving the reflected waveform. A control system collates information received from the receiver and controls the antennas. The antenna module (10) is transformable between a stored mode, where the antenna is collapsed and an operational mode, where the antenna is unfurled and deployed.</p> |
