ERSC 3V93 Lecture 51: Seismic Methods v2 III
6 May 2016
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Document Summary
Monostatic transmitter and receiver in same housing collects zero offset reflection profile. Bi static separate transmitter and receiver antennas used allows for recording of cmp records is frequency inversely. Antenna proportional to length, transmitter antenna is a dipole em source, antennas are identified by centre frequency, range of f, 10 mhz 1 ghz for geologic applications. Gpr systems can be operated in 4 survey modes: Transmitter (tx) and receiver (rx) antenna kept at constant offset and moved along survey line one station at a time. Several soundings taken at each position and stacked typically > 64 stacks for each sounding. Each trace represents one radar sounding multiple stacks for each trace (usually > 64) Buried object indicated by a hyperbolic event from diffraction object acts as point scatterer apex of diffraction indicates location and depth of object. Common mid-point gather collected by moving and rx. Apart by one station spacing, used for velocity analysis.
