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+ − 11 <title>LTPDA Training Session 1 (LTPDA Toolbox)</title>
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+ − 14 <meta name="description" content=
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+ − 15 "Presents an overview of the features, system requirements, and starting the toolbox.">
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+ − 16 </head>
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+ − 21 <p style="font-size:1px;"> </p>
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+ − 23 <table class="nav" summary="Navigation aid" border="0" width=
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+ − 24 "100%" cellpadding="0" cellspacing="0">
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+ − 25 <tr>
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+ − 26 <td valign="baseline"><b>LTPDA Toolbox</b></td><td><a href="../helptoc.html">contents</a></td>
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+ − 29 "bycategory.html"><img src="b_prev.gif" border="0" align=
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+ − 30 "bottom" alt="Functions - By Category"></a> <a href=
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+ − 31 "ltpda_training_topic_1.html"><img src="b_next.gif" border="0" align=
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+ − 32 "bottom" alt="Topic 1 - The basics of LTPDA"></a></td>
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+ − 33 </tr>
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+ − 34 </table>
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+ − 35
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+ − 36 <h1 class="title"><a name="f3-12899" id="f3-12899"></a>LTPDA Training Session 1</h1>
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+ − 37 <hr>
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+ − 38
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+ − 39 <p>
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+ − 40 <p>
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+ − 41 This series of help pages consitute the first training session of LTPDA. The various data-packs used throughout
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+ − 42 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>.
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+ − 43 </p>
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+ − 44 <ol>
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+ − 45 <li><a href="ltpda_training_topic_1.html">Topic 1 - The basics of LTPDA</a></li>
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+ − 46 <li><a href="ltpda_training_topic_2.html">Topic 2 - Pre-processing of data</a></li>
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+ − 47 <li><a href="ltpda_training_topic_3.html">Topic 3 - Spectral Analysis</a></li>
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+ − 48 <li><a href="ltpda_training_topic_4.html">Topic 4 - Transfer function models and digital filtering</a></li>
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+ − 49 <li><a href="ltpda_training_topic_5.html">Topic 5 - Model fitting</a></li>
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+ − 50 </ol>
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+ − 51 <p>
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+ − 52 In addition, throughout the course of this training session, we will perform a full analysis
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+ − 53 of some lab data. The inputs to the analysis are two time-series data streams,
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+ − 54 the first is the recorded output of an interferometer, the second is a recording
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+ − 55 of the room temperature in the vicinity of the interferometer. Both are recorded with
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+ − 56 different sample rates and on different sampling grids. The temperature data is unevenly
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+ − 57 sampled, and may evem have missing samples.
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+ − 58 </p>
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+ − 59 <p>
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+ − 60 During each topic of the training session, the data will be manipulated using
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+ − 61 the tools introduced in that topic (and previous topics). The aim of the data
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+ − 62 analysis is to determine the influence of temperature on the interferometer
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+ − 63 output. In particular the steps will be:
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+ − 64 </p>
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+ − 65 <ol>
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+ − 66 <li><a href="ltpda_training_topic_1.html">Topic 1</a>
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+ − 67 Loading and calibrating the raw data.
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+ − 68 <ol>
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+ − 69 <li>Read in the raw data files and convert them to AOs</li>
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+ − 70 <li>Plot the two data streams</li>
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+ − 71 <li>Calibrate the interferometer output to meters (from radians)</li>
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+ − 72 <li>Calibrate the temperature data to degrees Kelvin from degrees Celcius</li>
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+ − 73 <li>Save the calibrated data series to XML files, ready for the input to the next topic</li>
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+ − 74 </ol>
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+ − 75 </li>
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+ − 76 <li><a href="ltpda_training_topic_2.html">Topic 2</a>
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+ − 77 Pre-processing and data conditioning.
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+ − 78 <ol>
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+ − 79 <li>Read in the calibrated AOs from XML files</li>
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+ − 80 <li>Trim the data streams to the same time segments</li>
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+ − 81 <li>Resample the temperature on to an even sampling grid with no missing samples</li>
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+ − 82 <li>Resample to the two data streams to a common 1Hz sample rate</li>
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+ − 83 <li>Interpolate the two data streams on to the same time grid</li>
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+ − 84 <li>Save the cleaned data to AO XML files</li>
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+ − 85 </ol>
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+ − 86 </li>
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+ − 87 <li><a href="ltpda_training_topic_3.html">Topic 3</a>
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+ − 88 Spectral analysis.
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+ − 89 <ol>
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+ − 90 <li>Load the time-series data from Topics 1 and 2</li>
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+ − 91 <li>Compare PSDs of the time-series data before and after pre-processing</li>
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+ − 92 <li>Check the coherence of temperature and IFO output before and after pre-processing</li>
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+ − 93 <li>Measure the transfer function from temperature to IFO output</li>
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+ − 94 <li>Save the measured transfer function to disk as an AO XML file</li>
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+ − 95 </ol>
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+ − 96 </li>
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+ − 97 <li><a href="ltpda_training_topic_4.html">Topic 4</a>
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+ − 98 Simulation of the system under investigation.
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+ − 99 <ol>
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+ − 100 <li>Make approximate noise-shape models for the temperature and IFO displacement input spectra</li>
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+ − 101 <li>Make digital IIR filters matching these noise-shape models</li>
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+ − 102 <li>Filter white-noise data streams to produce simulated versions of the temperature and IFO inputs</li>
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+ − 103 <li>Make a model of the temperature to IFO coupling</li>
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+ − 104 <li>Construct a filter representing this coupling</li>
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+ − 105 <li>Filter the simulated temperature data and add it to the simulated IFO input data</li>
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+ − 106 <li>Save the simulated temperature and the simulated IFO output data to disk</li>
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+ − 107 <li>Repeat the steps from Topic 3, this time using the simulated data</li>
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+ − 108 </ol>
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+ − 109 </li>
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+ − 110 <li><a href="ltpda_training_topic_5.html">Topic 5</a>
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+ − 111 Model fitting and system identification.
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+ − 112 <ol>
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+ − 113 <li>Load the measured transfer function from the end of Topic 3</li>
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+ − 114 <li>Fit a model transfer function to this measurement</li>
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+ − 115 <li>Make a digital filter representation of the fitted model</li>
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+ − 116 <li>Filter the temperature data with this filter</li>
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+ − 117 <li>Compare the PSD of the filtered temperature data and the IFO output</li>
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+ − 118 <li>Subtract the filtered temperature data from the IFO output</li>
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+ − 119 <li>Compare the IFO data with the temperature influence subtracted to the original IFO output</li>
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+ − 120 <li>(Time permitting) Repeat the exercise for the simulated from Topic 4</li>
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+ − 121 <li>(Still need something to do?) Repeat the steps of Topic 4 but this time fit a model to the measured
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+ − 122 temperature data and use a noise generator to make a simulated temperature data stream</li>
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+ − 123 </ol>
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+ − 124 </li>
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+ − 125 </ol>
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+ − 126 </p>
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+ − 127
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+ − 128 <br>
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+ − 129 <br>
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+ − 130 <table class="nav" summary="Navigation aid" border="0" width=
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+ − 132 <tr valign="top">
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+ − 133 <td align="left" width="20"><a href="bycategory.html"><img src=
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+ − 134 "b_prev.gif" border="0" align="bottom" alt=
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+ − 135 "Functions - By Category"></a> </td>
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+ − 136
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+ − 137 <td align="left">Functions - By Category</td>
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+ − 138
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+ − 139 <td> </td>
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+ − 140
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+ − 141 <td align="right">Topic 1 - The basics of LTPDA</td>
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+ − 142
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+ − 144 "ltpda_training_topic_1.html"><img src="b_next.gif" border="0" align=
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+ − 145 "bottom" alt="Topic 1 - The basics of LTPDA"></a></td>
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+ − 146 </tr>
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+ − 147 </table><br>
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+ − 148
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+ − 149 <p class="copy">©LTP Team</p>
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+ − 150 </body>
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+ − 151 </html>