mirror of
git://projects.qi-hardware.com/ben-wpan.git
synced 2024-11-22 07:45:56 +02:00
usrp/README: described how to perform and evaluate a measurement run
This commit is contained in:
parent
45d5946435
commit
66f6ad6f7c
44
usrp/README
44
usrp/README
@ -14,7 +14,7 @@ characteristics.
|
||||
Preparing a measurement run
|
||||
---------------------------
|
||||
|
||||
Before measuring the characteristics of an antenne, we need to set up the
|
||||
Before measuring the characteristics of an antenna, we need to set up the
|
||||
test environment and obtain a number of filtering parameters. The filters
|
||||
are used to reduce the effect of noise on the measurements and to suppress
|
||||
contamination from other sources.
|
||||
@ -149,3 +149,45 @@ contamination from other sources.
|
||||
|
||||
The output are three numbers: the average (after eliminating
|
||||
outliers), the minimum, and the maximum.
|
||||
|
||||
|
||||
Performing a measurement run
|
||||
----------------------------
|
||||
|
||||
The script "fscan" performs 100 scans of the 26 channels used by IEEE
|
||||
802.15.4. The frequency scan is the inner loop, so that slow changes
|
||||
in environmental parameters (background noise, temperature, etc.) will
|
||||
affect the spread of the results over the entire frequency range instead
|
||||
of causing seemingly frequency-dependent distortions.
|
||||
|
||||
The script is written for a setup that uses a pair of hosts, both
|
||||
sharing the same file system.
|
||||
|
||||
Usage: fscan out-dir [tx-power]
|
||||
|
||||
The output directory must not exist yet. The transmit power is in dBm and
|
||||
defaults to 2.6 dBm.
|
||||
|
||||
Example: ./fscan testant
|
||||
|
||||
The full run takes approximately half an hour.
|
||||
|
||||
The results are filtered and averaged by the script "evscan". This script
|
||||
contains the filtering parameters obtained in the preparation, described
|
||||
above.
|
||||
|
||||
Example: ./evscan testant >testant.out
|
||||
|
||||
The output is a graph with frequency, average signal strength, minimum
|
||||
and maximum. The format is compatible with gnuplot's "with errorbars"
|
||||
(or "with errorlines") plot style.
|
||||
|
||||
Finally, the results can be plotted with the script "plscan", which uses
|
||||
gnuplot to output either in a window or to a PNG file.
|
||||
|
||||
Usage: plscan [-o pngfile] file ...
|
||||
|
||||
More than one graph can be plotted in the same run. The file name is used
|
||||
as the title for each graph. Titles are truncated at the first dot.
|
||||
|
||||
Example: ./plscan testant.out
|
||||
|
Loading…
Reference in New Issue
Block a user