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authorHarald Welte <laforge@gnumonks.org>2016-05-23 19:48:03 +0200
committerHarald Welte <laforge@gnumonks.org>2016-05-23 19:51:10 +0200
commitbc55a9c7e8177dc2503e3b9f46b80618db48001c (patch)
tree389c02e5741ee25c6a26eba91565e6ba4a97a23a /pathloss
initial checkin of gnumeric path loss functions
This code extends gnumeric with some functions to compute the RF propagation path loss by some common models.
Diffstat (limited to 'pathloss')
-rw-r--r--pathloss/COPYING339
-rw-r--r--pathloss/pathloss-func.py112
-rw-r--r--pathloss/plugin.xml21
3 files changed, 472 insertions, 0 deletions
diff --git a/pathloss/COPYING b/pathloss/COPYING
new file mode 100644
index 0000000..d159169
--- /dev/null
+++ b/pathloss/COPYING
@@ -0,0 +1,339 @@
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diff --git a/pathloss/pathloss-func.py b/pathloss/pathloss-func.py
new file mode 100644
index 0000000..a9e9a65
--- /dev/null
+++ b/pathloss/pathloss-func.py
@@ -0,0 +1,112 @@
+# pathloss-func.py
+
+# (C) 2016 by Harald Welte <laforge@gnumonks.org>
+# All Rights Reserved
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+from Gnumeric import GnumericError, GnumericErrorVALUE
+import Gnumeric
+import string
+import math
+
+def lambda_by_mhz(freq_mhz):
+ return 300/freq_mhz
+
+def func_fsl(freq_mhz, dist_m):
+ '@FUNCTION=PATHLOSS_FREESPACE\n'\
+ '@SYNTAX=pathloss_freespace(freq_mhz, dist_m)\n'\
+ '@DESCRIPTION=Compute Free Space Path Loss (in dB)\n'\
+ '@SEEALSO=pathloss_egli,pathloss_hata\n'
+
+ wavelen = lambda_by_mhz(freq_mhz)
+
+ return -20 * math.log10(wavelen / (4*3.1416*dist_m))
+
+def hata_ch(envi, freq_mhz, rx_ant_m):
+ logfreq = math.log10(freq_mhz)
+ ch = 0
+ if envi == 'city_small' or envi == 'city_medium':
+ ch = 0.8 + (1.1 * logfreq - 0.7)*rx_ant_m - (1.56 * logfreq)
+ elif envi == 'city_large':
+ if freq_mhz < 200:
+ ch = 8.29 * math.pow(math.log10(1.54*rx_ant_m), 2) - 1.1
+ elif freq_mhz > 200:
+ ch = 3.2 * math.pow(math.log10(11.75*rx_ant_m), 2) - 4.97
+ return ch
+
+def hata_cm(envi, freq_mhz):
+ logfreq = math.log10(freq_mhz)
+ att = 0
+ if freq_mhz <= 1500:
+ if envi == 'open_area' or envi == 'rural':
+ # https://en.wikipedia.org/wiki/Hata_model_for_open_areas
+ att = -4.78 * math.pow(logfreq, 2) + 18.33 * logfreq - 40.94
+ elif envi == 'suburban':
+ # https://en.wikipedia.org/wiki/Hata_model_for_suburban_areas
+ att = -2 * math.pow(logfreq/28, 2) - 5.4
+ else:
+ if envi == 'city_large':
+ att = 3
+ else:
+ att = 0
+ return att
+
+def func_hata(envi, freq_mhz, dist_m, bts_ant_m, ms_ant_m):
+ '@FUNCTION=PATHLOSS_HATA\n'\
+ '@SYNTAX=pathloss_hata(environment, freq_mhz, dist_m, bts_ant_m, ms_ant_m)\n'\
+ '@DESCRIPTION=Compute Path Loss (in dB) as per Hata Model\n'\
+ '@SEEALSO=pathloss_freespace,pathloss_hata\n'
+
+ # FIXME: valid for 150MHz - 2GHz, MS 1-10m, BS 30-200m, dist # 1-10km
+ environs = ('open_area', 'rural', 'suburban', 'city_small',
+ 'city_medium', 'city_large')
+ if not envi in environs:
+ raise GnumericError,GnumericErrorVALUE
+
+ # http://morse.colorado.edu/~tlen5510/text/classwebch3.html
+ if freq_mhz <= 1500:
+ c0 = 69.55
+ cf = 26.16
+ else:
+ c0 = 46.3
+ cf = 33.9
+
+ # https://en.wikipedia.org/wiki/Hata_model_for_urban_areas
+ hata = c0 + cf * math.log10(freq_mhz)
+ hata -= 13.82 * math.log10(bts_ant_m)
+ hata -= hata_ch(envi, freq_mhz, ms_ant_m)
+ hata += (44.9 - 6.55 * math.log10(bts_ant_m)) * math.log10(dist_m/1000)
+ # subtract correction for open_area / suburban
+ hata += hata_cm(envi, freq_mhz)
+
+ return hata
+
+def func_egli(freq_mhz, dist_m, tx_ant_m, rx_ant_m):
+ '@FUNCTION=PATHLOSS_EGLI\n'\
+ '@SYNTAX=pathloss_egli(freq_mhz, dist_m, tx_ant_m, rx_ant_m)\n'\
+ '@DESCRIPTION=Compute Path Loss (in dB) as per Egli Model\n'\
+ '@SEEALSO=foo\n'
+
+ # https://en.wikipedia.org/wiki/Egli_model
+ att = -20 * math.log10(rx_ant_m*tx_ant_m / (dist_m*dist_m))
+ att += 20 * math.log10(freq_mhz/40)
+
+ return att
+
+pathlossfunc_functions = {
+ 'pathloss_freespace': ('ff', 'freq_mhz, dist_m', func_fsl),
+ 'pathloss_egli': ('ffff', 'freq_mhz, dist_m, tx_ant_m, rx_ant_m', func_egli),
+ 'pathloss_hata': ('sffff', 'environ, freq_mhz, dist_m, bts_ant_m, ms_ant_m', func_hata),
+}
diff --git a/pathloss/plugin.xml b/pathloss/plugin.xml
new file mode 100644
index 0000000..8ece45a
--- /dev/null
+++ b/pathloss/plugin.xml
@@ -0,0 +1,21 @@
+<?xml version="1.0"?>
+<plugin id="Gnumeric_pathlossFuncPlugin">
+ <information>
+ <name>RF Path Loss Functions</name>
+ <description></description>
+ </information>
+ <loader type ="Gnumeric_PythonLoader:python">
+ <attribute name="module_name" value="pathloss-func"/>
+ </loader>
+ <services>
+ <service type="function_group" id="pathlossfunc">
+ <category>Local Python</category>
+ <functions>
+ <function name='pathloss_freespace'/>
+ <function name='pathloss_egli'/>
+ <function name='pathloss_hata'/>
+ <function name='pathloss_cost_hata'/>
+ </functions>
+ </service>
+ </services>
+</plugin>
personal git repositories of Harald Welte. Your mileage may vary