Quasi-Periodic Sensor Data Delta Compression for Wireless Field Units
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Solution Overview
Problem
Industrial facilities face challenges with battery-powered field units used for monitoring machine parameters, as they have limited bandwidth for wireless data transmission, leading to increased operational costs, frequent battery replacements, and safety concerns due to data transmission errors and delays.
Innovation Solution
A sensor sampling system that generates a delta data set by phase-aligning and comparing quasi-periodic signal waveforms, reducing the amount of data transmitted by utilizing the similarities between cycles, thereby reducing the power and time required for wireless transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If field units transmit sampled sensor data over wireless network, then machine parameter monitoring is achieved, but battery operational time is limited and transmission errors occur
Solution Approach 1:
The patent extracts only the essential information from the sensor data by identifying and transmitting only those data points that represent actual changes in machine parameters. Instead of transmitting all sampled data, the system extracts delta values that indicate meaningful deviations from normal operation, thereby reducing transmission volume and extending battery life while maintaining monitoring reliability
Solution Approach 2:
The patent changes the parameter representation by transforming raw sensor readings into delta values that represent changes rather than absolute values. This parameter transformation reduces the amount of data that needs to be transmitted while preserving the essential information about machine state changes, thus extending battery operational time without compromising transmission reliability
2Loss of information
If field units sample and transmit sensor signals continuously, then complete monitoring data is obtained, but wireless network bandwidth is exceeded and transmission errors increase
Solution Approach 1:
The patent applies extraction by removing redundant data from the transmission stream. The system identifies and extracts only the critical delta values that represent actual parameter changes, discarding repetitive information that does not contribute to monitoring effectiveness. This reduces data transmission volume while preserving the completeness of essential monitoring information
Solution Approach 2:
The patent uses partial action by transmitting only a subset of the sampled data - specifically, only those data points that represent meaningful changes. Rather than transmitting all sampled values, the system selectively transmits partial data sets that contain the essential information needed for complete monitoring, thus reducing overall transmission volume without losing critical information
3Measurement precision
If field units transmit high-frequency sensor data, then real-time monitoring accuracy is improved, but power consumption increases
Solution Approach 1:
The patent extracts only the essential measurement information by identifying delta values that represent actual parameter changes. Instead of transmitting all high-frequency data points, the system extracts and transmits only those values that contribute to monitoring accuracy, thereby reducing transmission power consumption while maintaining measurement precision for critical parameters
Solution Approach 2:
The patent changes the data representation from absolute values to delta values, which reduces the information content that needs to be transmitted. This parameter transformation maintains the precision of monitoring by preserving change information while reducing the power required for transmission by minimizing the data volume
Data Source
AI summary
A sensor sampling system comprises a base station and a field unit. The field unit receives a quasi-periodic signal representing machine parameters monitored by a machine sensor, and samples a first portion of the quasi-periodic signal to generate a first reference waveform. The field unit subsequently samples a second portion of the quasi-periodic signal to generate a first sample waveform. Finally, the field unit generates a first delta data set representing a difference between the first reference waveform and the first sample waveform and wirelessly transmits a representation of the first delta data set for reception by the base station.