公开(公告)号：JP2000098045A

公开(公告)日：2000-04-07

申请号：JP22401099

申请日：1999-08-06

Applicant: INPUT OUTPUT INC

Inventor： ISELI JAMES ,  CAMBIZ AFKAMI ,  LAWRENCE P BAIN ,  THOMAS BUIE ,  THOMAS G REETE ,  JOHN E BARNETT JR

IPC: G01V1/22

Abstract: PROBLEM TO BE SOLVED: To capture seismic data remotely and at the same time execute remote monitoring by dividing a communication channel into M frequency bands and at the same time dividing each frequency band into N+1 time slots. SOLUTION: A communication channel 300 of an earthquake-capturing system is divided into M frequency slots and N time intervals. More specifically, the communication channel 300 is divided by combining time sharing and frequency sharing. While the earthquake-capturing system is operating, a first sensor transmits data according to a slot number 1 using the communication channel 300, and a second sensor transmits data according to a slot number 2. This sort of transmission is repeated successively and a sensor N transmits data by a time slot M. An opposite link slot is preferably used for transmitting timing and control information to all sensors. When a data rate becomes faster or slower, a plurality of time slots are captured as needed to support throughput requirements.