- The document presents a method for intrusion detection in open fields using geophones to detect seismic waves generated by intruders. - A sensor node is developed that uses a geophone, amplifier, band-pass filter, envelope detector, and microcontroller to analyze seismic signals and detect intrusions based on the kurtosis of the signals. - If an intrusion is detected, the sensor node wirelessly notifies an unmanned vehicle (UGV) which uses GPS to navigate to the location and take appropriate action. The overall system aims to provide security over large open areas that traditional camera-based methods cannot adequately cover.