Seismic exploration method - main HF station distanced from detectors transmits digital code groups of all detector stations

摘要

The code signals are transmitted as h.f. signals in a specified sequence in real time. The digital code groups correspond to the amplitudes of seismic waves measured at detector stations and scanned at uniform scanning intervals. Code groups received at the main stations are multiplexed. The h.f. transmissions consist of pulses with spread spectrum. The scanning intervals are in the range between two and eight ms. Digital code groups are transmitted from a secondary to the main stations. They represent the h.f. propagation times over paths between the stations, of which at least one passes through the detector stations.