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annotate pathloss/fsl.c @ 70:47947e25f922

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tmo/CSD-tests: document experimental findings
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 25 Nov 2024 07:22:43 +0000
parents 599fac1b882d
children
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599fac1b882d pathloss: implement FSL
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1 /*
599fac1b882d pathloss: implement FSL
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2 * Free Space Loss calculation
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3 */
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4
599fac1b882d pathloss: implement FSL
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5 #define _GNU_SOURCE
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6 #include <math.h>
599fac1b882d pathloss: implement FSL
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7 #include "range_func.h"
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8
599fac1b882d pathloss: implement FSL
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9 #define PI_f ((float) M_PI)
599fac1b882d pathloss: implement FSL
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10
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11 float rf_range_freespace(float freq_mhz, float path_loss)
599fac1b882d pathloss: implement FSL
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12 {
599fac1b882d pathloss: implement FSL
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13 float wavelen = 300.0f / freq_mhz;
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14
599fac1b882d pathloss: implement FSL
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15 return (wavelen / pow10f(path_loss / -20.0f)) / (PI_f * 4.0f);
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16 }