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usrp/README: described how to perform and evaluate a measurement run
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usrp/README
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usrp/README
@ -14,7 +14,7 @@ characteristics.
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Preparing a measurement run
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---------------------------
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Before measuring the characteristics of an antenne, we need to set up the
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Before measuring the characteristics of an antenna, we need to set up the
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test environment and obtain a number of filtering parameters. The filters
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are used to reduce the effect of noise on the measurements and to suppress
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contamination from other sources.
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@ -149,3 +149,45 @@ contamination from other sources.
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The output are three numbers: the average (after eliminating
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outliers), the minimum, and the maximum.
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Performing a measurement run
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----------------------------
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The script "fscan" performs 100 scans of the 26 channels used by IEEE
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802.15.4. The frequency scan is the inner loop, so that slow changes
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in environmental parameters (background noise, temperature, etc.) will
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affect the spread of the results over the entire frequency range instead
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of causing seemingly frequency-dependent distortions.
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The script is written for a setup that uses a pair of hosts, both
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sharing the same file system.
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Usage: fscan out-dir [tx-power]
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The output directory must not exist yet. The transmit power is in dBm and
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defaults to 2.6 dBm.
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Example: ./fscan testant
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The full run takes approximately half an hour.
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The results are filtered and averaged by the script "evscan". This script
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contains the filtering parameters obtained in the preparation, described
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above.
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Example: ./evscan testant >testant.out
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The output is a graph with frequency, average signal strength, minimum
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and maximum. The format is compatible with gnuplot's "with errorbars"
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(or "with errorlines") plot style.
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Finally, the results can be plotted with the script "plscan", which uses
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gnuplot to output either in a window or to a PNG file.
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Usage: plscan [-o pngfile] file ...
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More than one graph can be plotted in the same run. The file name is used
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as the title for each graph. Titles are truncated at the first dot.
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Example: ./plscan testant.out
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