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annotate pathloss/egli.c @ 70:47947e25f922 default tip

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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 0cfea66a15f3
children
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1 /*
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2 * RF range calculation per Egli model
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3 */
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5 #define _GNU_SOURCE
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6 #include <math.h>
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7 #include "range_func.h"
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9 float rf_range_egli(float freq_mhz, float path_loss, float bts_ant_m,
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10 float ms_ant_m)
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11 {
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12 float l, r, x;
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14 l = 20.0f * log10f(freq_mhz / 40.0f);
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15 r = path_loss - l;
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16 x = bts_ant_m * ms_ant_m;
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17 return sqrtf(x / pow10f(r / -20.0f));
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18 }