Frequency-Domain Downconversion for Resource-Limited Borehole Telemetry
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Solution Overview
Problem
In borehole drilling operations, communication between downhole sensors and the surface is challenging due to hostile environments and limited computational resources, making it difficult to efficiently process received data using existing electromagnetic and acoustic telemetry methods.
Innovation Solution
A method and apparatus for downconverting frequency modulated signals using chirp codes and calibration signals to equalize the effects of a dynamically changing communication channel, allowing for efficient data processing in the frequency domain, which reduces computational requirements and improves data recovery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If acoustic telemetry is used for in-well communications, then communication capability in hostile downhole environments is improved, but computational resource requirements increase beyond available hardware capabilities
Solution Approach 1:
The patent segments the signal processing task into two parts: downconversion is performed at the receiver using available hardware resources, while the remaining processing is done at the surface. This division allows the downhole device to use limited computational resources efficiently while still achieving reliable communication.
Solution Approach 2:
The patent performs preliminary downconversion of the received frequency-modulated signal to a lower intermediate frequency before further processing. This preliminary action reduces the computational complexity of subsequent processing steps, making them feasible for implementation on resource-constrained downhole hardware.
2Productivity
If frequency domain processing is used to improve data processing efficiency, then processing speed increases, but computational complexity and resource requirements increase
Solution Approach 1:
The patent segments the frequency domain processing to be performed only on the downconverted intermediate frequency signal rather than the full-bandwidth high-frequency signal. This segmentation reduces the number of computational operations required in the frequency domain while still achieving processing efficiency benefits.
3Reliability
If downconversion to intermediate frequency is performed, then noise immunity and signal processing capability are improved, but additional processing steps and computational resources are required
Solution Approach 1:
The downconversion to intermediate frequency is performed as a preliminary processing step at the receiver using available hardware resources. This preliminary action improves noise immunity by moving the signal to a frequency range with lower noise levels, while the complexity is managed by performing this step before more intensive processing.
Solution Approach 2:
The intermediate frequency acts as an intermediary stage between the received high-frequency signal and the final baseband processing. This intermediary frequency domain allows for simplified filtering and processing operations that would be more complex if performed directly on the high-frequency signal.
Data Source
AI summary
Apparatus for downconverting a received frequency modulated communication signal is provided. The apparatus comprises processing circuitry to: obtain first digital frequency domain data based on the received frequency modulated communication signal; process the first digital frequency domain data in the frequency domain to provide downconverted digital frequency domain data, wherein the processing is to comprise frequency shifting data based on at least a portion of the first digital frequency domain data, wherein the downconverted digital frequency domain data has fewer data points than the first digital frequency domain data; and convert the downconverted digital frequency domain data into the time domain.