| 摘要 |
The method and apparatus look in advance of coal mining activity to provide a visual display of a coal seam and particular discontinuities that may lie therein. The radar method operates in the frequency range of 10 Megahertz to 5 Gigahertz and employs received signal- processing, both analog and digital, which aims to reduce problems inherent with source coherent noise or interference as well as random noise. The received electromagnetic energy is amplified, sampled and band pass filtered with subsequent time gain amplification thereafter, a time analog return signal may be viewed directly and/or the return signal may be digitally processed to enable further signal refinement. A control microprocessor is utilized for both tape record control and digital signal processing, and the processor includes the capability for compositing and/or stacking of common source point data for output record and display. <IMAGE> |
