WIRELESS TELEMETRY TYPE SEISMIC INSPECTION DATA TRANSMISSION

摘要

PURPOSE:To achieve a highly reliable data transmission while measuring the position of a seismograph performing a data transmission by transmitting a data by a spectrum diffusive communication system. CONSTITUTION:When a seismic data transmission start signal transmitted from a main recorder 1 is received, measuring devices #1-#200 start transmission of a seismic data. The measuring devices transmit signals of a synchronous preamplification code encoded for each thereof and then, a seismic data signal. The measuring devices #1-#200 convert a seismic wave signal into a digital signal to be transmitted by a spectrum diffusive modulation. Recorders 1 and 2 take a correlationship among signals sent from the measuring devices to identify a synchronous preamplification signal by an reverse diffusion so that the arrival time of the signals is discriminated for each measuring device to measure distance to the measuring devices from the arrival time. The use of a spectrum diffusive communication system enables a highly reliable data transmission regardless of a worse S/N ratio.