Patent ID: 6744253
Filing Date: 2004-06-01
Classification: G01V

Abstract:
A geologic anomaly sensing system, comprising:an oscillator for providing a reference frequency signal; a first radio frequency transmitter synchronized to the oscillator and providing for a ground-penetrating RF-probe signal; a second radio frequency transmitter synchronized to the oscillator and providing for a ground-penetrating RF-synchronizing signal that is lower in frequency than said RF-probe signal; a first fiberoptic cable connected to provide said reference frequency signal from the oscillator to a remotely located one of the first and second radio frequency transmitters, a first radio frequency receiver for receiving said RF-probe signal which has been affected by an intervening geologic anomaly in its phase and amplitude; a second radio frequency receiver for receiving said RF-synchronizing signal; a second fiberoptic cable connected to provide a derivative of said reference frequency signal obtained from the second radio frequency receiver; a coherent receiver connected to the first and second radio frequency receivers through the second fiber optic cable, and having a frequency synthesizer able to lock on to said RF-synchronizing signal and providing for synchronous detection of said RF-probe signal; and an anomaly image processing sub-system for interpreting attenuation and phase shift affects on said RF-probe signal and characterizing the nature of said intervening geologic anomaly in an output.