Multi-Channel Telemetry Synchronization Sequences
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Solution Overview
Problem
Current wellbore communication systems face challenges in reliably transmitting data between downhole locations and the surface due to differences in propagation delays and clock synchronization across various physical and frequency channels, leading to difficulties in maintaining signal lock and optimizing telemetry signal reception.
Innovation Solution
The implementation of a method using synchronization sequences transmitted simultaneously or with a predetermined time difference across multiple channels, combined with channel propagation models and clock synchronization protocols, to improve the reliability of telemetry signal reception by adjusting for propagation delays and clock drift, and employing combined synchronization detectors and correlators to enhance signal synchronization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple channels are used for telemetry transmission, then data transmission capacity is improved, but clock synchronization and signal lock maintenance become more difficult
Solution Approach 1:
The patent applies preliminary action by transmitting synchronization sequences before actual data transmission on each channel. These synchronization sequences are sent in advance to establish timing references and enable the receiver to achieve signal lock on multiple channels before data transmission begins, thereby preparing the system to handle multi-channel data transmission while maintaining synchronization reliability
Solution Approach 2:
The patent implements feedback mechanisms through correlation detectors that continuously monitor the received signals on each channel. The system uses the correlation between transmitted synchronization sequences and received signals to provide feedback for adjusting timing and maintaining signal lock, enabling reliable operation across multiple transmission channels
2Reliability
If simultaneous transmission on multiple channels is implemented, then telemetry signal reception reliability is improved, but propagation delay differences cause synchronization issues
Solution Approach 1:
The patent uses preliminary action by sending synchronization sequences that contain timing information before actual data transmission. These sequences allow the receiver to measure and compensate for propagation delay differences between channels in advance, establishing a reference framework that enables simultaneous multi-channel transmission while accounting for timing variations
Solution Approach 2:
The patent applies parameter changes by adjusting the timing of synchronization sequence transmission on different channels based on their specific propagation characteristics. The system modifies transmission timing parameters for each channel to compensate for propagation delay differences, allowing simultaneous transmission while maintaining synchronization at the receiver
Data Source
AI summary
A method may include providing one or more telemetry transmission systems, the one or more transmission systems comprising one or more receivers and one or more transmitters. The method may also include transmitting a first synchronization sequence from the one or more telemetry transmission systems, the first synchronization sequence transmitted in a first channel, and the first synchronization sequence being at least a portion of a first telemetry signal. In addition, the method may include transmitting a second synchronization sequence the one or more telemetry transmission systems, the second synchronization sequence transmitted in a second channel, and the second synchronization sequence being at least a portion of a second telemetry signal. The first and second synchronization sequences may be transmitted simultaneously or at a predetermined time difference. The method may include receiving the first synchronization sequence at the one or more receivers, and receiving the second synchronization sequence at the one or more receivers.