Patent Document ID: 20160041281
Application ID: 14921383
Patent Flag: 0

Claim One:
1. A signal processing device that processes a measurement signal received by a vibration receiving means receiving vibration generated by a vibration generating means generating the vibration in an underground structure region having a plurality of regions of vibration propagation speeds, the signal processing device comprising: a measurement signal accumulating means for accumulating a first measurement signal having received first vibration generated by the vibration generating means and a second measurement signal having received second vibration generated at a time interval from generation of the first vibration; a vibration propagation speed data accumulating means for accumulating data of the vibration propagation speed; a propagation speed calculating means for calculating strength and a direction of the vibration in the underground structure region using a calculation model including the data of the vibration propagation speed; a propagation speed distribution information accumulating means for accumulating propagation speed distribution information in the underground structure region calculated by the propagation speed calculating means; a simulated signal input means for inputting seismic source information obtained by simulating the vibration generating means to the calculation model; a simulated propagation speed calculating means for inputting the seismic source information to the calculation model by the simulated signal input means and calculating the strength and the direction of the vibration in the underground structure region using the calculation model; a simulated propagation speed distribution information accumulating means for accumulating simulated propagation speed distribution information calculated by the simulated propagation speed calculating means; an update amount calculating means for calculating an update amount to update the calculation model, on the basis of the propagation speed distribution information and the simulated propagation speed distribution information; and an updating means for updating the calculation model using the update amount, wherein the calculation model is a solid model, and the propagation speed calculating means calculates strength and a direction of the first vibration using the first measurement signal input to the calculation model and calculates strength and a direction of the second vibration using the second measurement signal input to the calculation model.