FreeCalypso > hg > gsm-net-reveng

annotate pathloss/fsl.c @ 66:599fac1b882d

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
pathloss: implement FSL
author Mychaela Falconia <falcon@freecalypso.org>
date Fri, 25 Oct 2024 08:12:28 +0000
parents
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
66
599fac1b882d pathloss: implement FSL
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
1 /*
599fac1b882d pathloss: implement FSL
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
2 * Free Space Loss calculation
599fac1b882d pathloss: implement FSL
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
3 */
599fac1b882d pathloss: implement FSL
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
4
599fac1b882d pathloss: implement FSL
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
5 #define _GNU_SOURCE
599fac1b882d pathloss: implement FSL
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
6 #include <math.h>
599fac1b882d pathloss: implement FSL
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
7 #include "range_func.h"
599fac1b882d pathloss: implement FSL
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
8
599fac1b882d pathloss: implement FSL
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
9 #define PI_f ((float) M_PI)
599fac1b882d pathloss: implement FSL
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
10
599fac1b882d pathloss: implement FSL
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
11 float rf_range_freespace(float freq_mhz, float path_loss)
599fac1b882d pathloss: implement FSL
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
12 {
599fac1b882d pathloss: implement FSL
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
13 float wavelen = 300.0f / freq_mhz;
599fac1b882d pathloss: implement FSL
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
14
599fac1b882d pathloss: implement FSL
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
15 return (wavelen / pow10f(path_loss / -20.0f)) / (PI_f * 4.0f);
599fac1b882d pathloss: implement FSL
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
16 }