Wireless Seismic Survey System Using OFDMA-TDMA
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Solution Overview
Problem
Existing wireless seismic data acquisition systems face challenges with network congestion and low transmission rates due to the large number of geophones involved in seismic surveys, leading to inefficiencies in data delivery and increased operational costs.
Innovation Solution
The implementation of an OFDMA-TDMA based seismic data acquisition system that utilizes TV white space for transmission, allowing for efficient channel allocation and direct data transmission from wireless geophones to a central data receiving device, thereby reducing the need for intermediate relays and enhancing data delivery speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If wireless geophones transmit data directly to control station or concentrator, then data transmission is enabled, but network congestion occurs and transmission rate decreases
Solution Approach 1:
The patent segments the transmission process by introducing intermediate relay nodes (wireless routers) that collect data from multiple geophones and transmit to the control station. This divides the direct transmission path into collector- relay- controller segments, reducing simultaneous transmissions on any single path and eliminating network congestion.
Solution Approach 2:
The patent introduces wireless routers as intermediary devices between geophones and the control station. These routers act as mediators that aggregate data from multiple geophones and forward to the controller, reducing the number of simultaneous transmissions required and improving overall transmission rate.
2Measurement precision
If more geophones are deployed to increase data coverage, then subsurface imaging quality improves, but network congestion increases and transmission time increases
Solution Approach 1:
The patent segments the large-scale geophone network into multiple clusters, each served by a wireless router. This segmentation allows parallel data collection from multiple geophones at different locations, reducing total transmission time while maintaining comprehensive subsurface coverage through increased geophone deployment.
Solution Approach 2:
The patent adds a hierarchical dimension to the network architecture by introducing intermediate relay nodes. This multi-level structure (geophone-router-controller) enables simultaneous operations at different hierarchical levels, allowing more geophones to be deployed without linearly increasing transmission time.
3Reliability
If wired geophones are used to ensure reliable data transmission, then data delivery is stable, but system complexity and operational costs increase
Solution Approach 1:
The patent replaces the mechanical cable connection system with a wireless communication system. Wireless geophones use radio frequency transmission instead of physical cables, eliminating the complexity of cable deployment and maintenance while maintaining reliable data transmission through protocol-based error correction and acknowledgment mechanisms.
Data Source
AI summary
A system, computer-readable storage medium and method of reflection seismic survey in a wireless seismic network within a survey area is described. The method includes detecting, in each of a plurality of wireless seismic sensor nodes, seismic reflection signals from a seismic energy source; recording, in each of a plurality of wireless geophones, detected seismic signals; transmitting, by the geophones, the recorded seismic signals as digital data, using a combination of Orthogonal Frequency-Division Multiple Access (OFDMA) and Time Division Multiple Access (TDMA), to a central data receiving device; changing the seismic energy source location for seismic reflection; and repeating the detecting, recording and transmitting a number of times for each change in seismic energy source.