Geophysical Sensor Cable Telemetry Rerouting
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Solution Overview
Problem
Marine geophysical survey systems face operational downtime due to failures in geophysical sensor cables, as replacing faulty units is often impractical and time-consuming, leading to inefficiencies in data collection and survey operations.
Innovation Solution
Implementing redundant connections between telemetry units in geophysical sensor cables, allowing for autonomous rerouting of data packets and ensuring continuous data transmission even if primary communication channels fail, thereby reducing downtime and maintaining survey operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If redundant connections are implemented between telemetry units, then reliability is improved, but device complexity increases
Solution Approach 1:
The geophysical sensor cable is divided into multiple sections with telemetry units at intervals. Each telemetry unit independently manages its own redundant connections to adjacent units, segmenting the complexity management. This allows the system to achieve overall redundancy without requiring complex centralized control, as each segment handles its own failover independently.
Solution Approach 2:
Redundant communication paths are pre-established between adjacent telemetry units during system deployment. The primary and secondary communication channels are configured in advance, so that when a failure occurs, the system can immediately switch to the pre-configured redundant path without requiring complex real-time decision-making or reconfiguration.
2Loss of time
If autonomous rerouting capability is implemented, then loss of time is reduced, but device complexity increases
Solution Approach 1:
Each telemetry unit is equipped with autonomous failure detection and rerouting capabilities. When a communication failure is detected on the primary channel, the telemetry unit automatically switches to the secondary channel without requiring external intervention or complex centralized control logic. This self-service approach minimizes downtime while distributing the computational complexity across multiple simple units rather than concentrating it in a single complex controller.
3Reliability
If redundant communication channels are used, then reliability is improved, but ease of operation deteriorates
Solution Approach 1:
The system implements automatic feedback mechanisms where each telemetry unit continuously monitors the status of its primary and secondary communication channels. When a failure is detected, the unit automatically switches to the redundant channel and continues operation. This feedback-driven automatic management eliminates the need for manual intervention, making the system as easy to operate as a simple single-channel system while providing the reliability benefits of redundancy.
Data Source
AI summary
Managing movement of data packets along a geophysical sensor cable. At least some embodiments include a geophysical sensor cable section having an internal volume within which geophysical sensors are disposed at spaced apart locations. A digitizer is disposed within the internal volume and is communicatively coupled to sensors. A telemetry unit within the internal volume is communicatively coupled to the digitizer. The telemetry unit may comprise multiple forward ports, multiple aft ports and a controller communicatively coupled to the forward ports, the aft ports, and the digitizer. The controller may be configured to: relay downstream-directed packets received on an active forward port through all aft ports; gather sensor data from the digitizer and send the sensor data as upstream-directed packets through the active forward port; and relay any upstream-directed packets received on aft ports through the active forward port.