Synchronizing data from irregularly sampled sensors
A system and method include receiving a set of sampled measurements for each of multiple sensors, wherein the sampled measurements are at irregular intervals or different rates, re-sampling the sampled measurements of each of the multiple sensors at a higher rate than one of the sensor's set of sampled measurements, and synchronizing the sampled measurements of each of the multiple sensors.
1. A method comprising:
receiving, at a programmed computer, a set of sampled measurements comprising original data points for each of multiple sensors monitoring an industrial process during an original time period, wherein the set of sampled measurements were sampled at irregular intervals resulting in the original data points for each of the multiple sensors being unsynchronized between the multiple sensors;
re-sampling, via the programmed computer, the set of received sampled measurements of each of the multiple sensors at a higher rate than at least one of the multiple sensors, the re-sampling including:
synchronizing, via the programmed computer, the set of received sampled measurements of each of the multiple sensors, wherein synchronizing includes identifying new common instances of time during the original time period for the multiple sensors; and
interpolating, via the programmed computer, data points for each of the multiple sensors at the new common instances of time where no original data point exists for the set of synchronized sampled measurements.
2. The method of claim 1 wherein re-sampling the sampled measurements includes removing sampled measurements for each of sets of sampled measurements for the sensors where a gap occurs in one sensor's set of sampled measurements.
3. The method of claim 1 wherein a gap is defined as a time period that exceeds a threshold set for the sensor without a sampled measurement.
4. The method of claim 1 wherein synchronizing the sampled measurements comprises combining measurements to obtain values at each of equal time intervals.
5. The method of claim 1 wherein synchronizing the sampled measurements comprises interpolating measurements to obtain values at time stamps separated by equal time intervals.
6. The method of claim 5 wherein an average of at least two measurements is used to obtain a value for a time stamp between the times of the two measurements.
7. The method of claim 1 and further comprising using sampled measurements from a first sensor to filter re-sampled values corresponding to a second sensor.
8. The method of claim 1 and further comprising combining sampled measurements from multiple sensors to filter re-sampled values corresponding to a sensor.
9. The method of claim 8 wherein the industrial process monitored by each of the multiple sensors includes a wind turbine industrial process.