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comparison m-toolbox/html_help/help/ug/ltpda_training_intro_content.html @ 0:f0afece42f48
Import.
| author | Daniele Nicolodi <nicolodi@science.unitn.it> |
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| date | Wed, 23 Nov 2011 19:22:13 +0100 |
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| 1 <p> | |
| 2 This series of help pages consitute the first training session of LTPDA. The various data-packs used throughout | |
| 3 the tutorials are available for download on the <a href="http://www.lisa.aei-hannover.de/ltpda/training_sessions/training_session_1/training_session_1.html">LTPDA web-site</a>. | |
| 4 </p> | |
| 5 <ol> | |
| 6 <li><a href="ltpda_training_topic_1.html">Topic 1 - The basics of LTPDA</a></li> | |
| 7 <li><a href="ltpda_training_topic_2.html">Topic 2 - Pre-processing of data</a></li> | |
| 8 <li><a href="ltpda_training_topic_3.html">Topic 3 - Spectral Analysis</a></li> | |
| 9 <li><a href="ltpda_training_topic_4.html">Topic 4 - Transfer function models and digital filtering</a></li> | |
| 10 <li><a href="ltpda_training_topic_5.html">Topic 5 - Model fitting</a></li> | |
| 11 </ol> | |
| 12 <p> | |
| 13 In addition, throughout the course of this training session, we will perform a full analysis | |
| 14 of some lab data. The inputs to the analysis are two time-series data streams, | |
| 15 the first is the recorded output of an interferometer, the second is a recording | |
| 16 of the room temperature in the vicinity of the interferometer. Both are recorded with | |
| 17 different sample rates and on different sampling grids. The temperature data is unevenly | |
| 18 sampled, and may evem have missing samples. | |
| 19 </p> | |
| 20 <p> | |
| 21 During each topic of the training session, the data will be manipulated using | |
| 22 the tools introduced in that topic (and previous topics). The aim of the data | |
| 23 analysis is to determine the influence of temperature on the interferometer | |
| 24 output. In particular the steps will be: | |
| 25 </p> | |
| 26 <ol> | |
| 27 <li><a href="ltpda_training_topic_1.html">Topic 1</a> | |
| 28 Loading and calibrating the raw data. | |
| 29 <ol> | |
| 30 <li>Read in the raw data files and convert them to AOs</li> | |
| 31 <li>Plot the two data streams</li> | |
| 32 <li>Calibrate the interferometer output to meters (from radians)</li> | |
| 33 <li>Calibrate the temperature data to degrees Kelvin from degrees Celcius</li> | |
| 34 <li>Save the calibrated data series to XML files, ready for the input to the next topic</li> | |
| 35 </ol> | |
| 36 </li> | |
| 37 <li><a href="ltpda_training_topic_2.html">Topic 2</a> | |
| 38 Pre-processing and data conditioning. | |
| 39 <ol> | |
| 40 <li>Read in the calibrated AOs from XML files</li> | |
| 41 <li>Trim the data streams to the same time segments</li> | |
| 42 <li>Resample the temperature on to an even sampling grid with no missing samples</li> | |
| 43 <li>Resample to the two data streams to a common 1Hz sample rate</li> | |
| 44 <li>Interpolate the two data streams on to the same time grid</li> | |
| 45 <li>Save the cleaned data to AO XML files</li> | |
| 46 </ol> | |
| 47 </li> | |
| 48 <li><a href="ltpda_training_topic_3.html">Topic 3</a> | |
| 49 Spectral analysis. | |
| 50 <ol> | |
| 51 <li>Load the time-series data from Topics 1 and 2</li> | |
| 52 <li>Compare PSDs of the time-series data before and after pre-processing</li> | |
| 53 <li>Check the coherence of temperature and IFO output before and after pre-processing</li> | |
| 54 <li>Measure the transfer function from temperature to IFO output</li> | |
| 55 <li>Save the measured transfer function to disk as an AO XML file</li> | |
| 56 </ol> | |
| 57 </li> | |
| 58 <li><a href="ltpda_training_topic_4.html">Topic 4</a> | |
| 59 Simulation of the system under investigation. | |
| 60 <ol> | |
| 61 <li>Make approximate noise-shape models for the temperature and IFO displacement input spectra</li> | |
| 62 <li>Make digital IIR filters matching these noise-shape models</li> | |
| 63 <li>Filter white-noise data streams to produce simulated versions of the temperature and IFO inputs</li> | |
| 64 <li>Make a model of the temperature to IFO coupling</li> | |
| 65 <li>Construct a filter representing this coupling</li> | |
| 66 <li>Filter the simulated temperature data and add it to the simulated IFO input data</li> | |
| 67 <li>Save the simulated temperature and the simulated IFO output data to disk</li> | |
| 68 <li>Repeat the steps from Topic 3, this time using the simulated data</li> | |
| 69 </ol> | |
| 70 </li> | |
| 71 <li><a href="ltpda_training_topic_5.html">Topic 5</a> | |
| 72 Model fitting and system identification. | |
| 73 <ol> | |
| 74 <li>Load the measured transfer function from the end of Topic 3</li> | |
| 75 <li>Fit a model transfer function to this measurement</li> | |
| 76 <li>Make a digital filter representation of the fitted model</li> | |
| 77 <li>Filter the temperature data with this filter</li> | |
| 78 <li>Compare the PSD of the filtered temperature data and the IFO output</li> | |
| 79 <li>Subtract the filtered temperature data from the IFO output</li> | |
| 80 <li>Compare the IFO data with the temperature influence subtracted to the original IFO output</li> | |
| 81 <li>(Time permitting) Repeat the exercise for the simulated from Topic 4</li> | |
| 82 <li>(Still need something to do?) Repeat the steps of Topic 4 but this time fit a model to the measured | |
| 83 temperature data and use a noise generator to make a simulated temperature data stream</li> | |
| 84 </ol> | |
| 85 </li> | |
| 86 </ol> |