v1.3.8

Added Free Space Path Loss model (ITU-R P.525)

Author: soofsayer

fspl.cpp

@@ -0,0 +1,33 @@
+/*****************************************************************************
+*  ITU-R P.525 Free Space Path Loss model for Signal Server by Alex Farrant  *  
+*  15 January 2014										                     *
+*  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 any later    *
+*  version.								   								     *
+* 									    									 *
+*  This program is distributed in the hope that it will 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.													     *
+*									     									 */
+
+#include <stdlib.h>
+#include <math.h>
+#include <iostream>
+
+using namespace std;
+
+double FsplLinkdB(float f, float d){
+/*
+Free Space Path Loss model
+Frequency: Any
+Distance: Any 
+*/
+	//MHz to GHz
+	f = f / 1000;
+
+	double dbloss = (20 * log10(d)) + (20 * log10(f)) + 92.45;
+   
+	return dbloss;
+}

main.cpp

@@ -1,5 +1,5 @@
 /****************************************************************************\
-*	   Signal Server 1.3.7: Server optimised SPLAT! by Alex Farrant          *
+*	   Signal Server 1.3.8: Server optimised SPLAT! by Alex Farrant          *
 ******************************************************************************
 *	SPLAT! Project started in 1997 by John A. Magliacane, KD2BD 	         *
 *					                                                         *
@@ -19,7 +19,7 @@
 *  for more details.							     *
 *									     *
 ******************************************************************************
-* g++ -Wall -O3 -s -lm -fomit-frame-pointer itm.cpp cost.cpp hata.cpp main.cpp -o ss  * 
+* g++ -Wall -O3 -s -lm -fomit-frame-pointer itm.cpp hata.cpp cost.cpp fspl.cpp main.cpp -o ss  * 
 \****************************************************************************/
 
 #include <stdio.h>
@@ -122,6 +122,8 @@ double HataLinkdB(float f,float h_B, float h_M, float d, int mode);
 
 double CostHataLinkdB(float f,float h_B, float h_M, float d);
 
+double FsplLinkdB(float f, float d);
+
 double ked(double freq, double elev[], double rxh, double dkm);
 
 double arccos(double x, double y)
@@ -1788,6 +1790,11 @@ void PlotPropPath(struct site source, struct site destination, unsigned char mas
 			    // COST231-HATA
 				loss=CostHataLinkdB(LR.frq_mhz,txelev,path.elevation[y]+(destination.alt*METERS_PER_FOOT),dkm);
 				break;
+			  case 7:
+			    // ITU-R P.525 Free space path loss
+				loss=FsplLinkdB(LR.frq_mhz,dkm);
+				//fprintf(stdout,"MHz: %1f KM: %1f = %1fdB",LR.frq_mhz,dkm,loss);
+				break;
 
 			  default:
 				 point_to_point(elev,source.alt*METERS_PER_FOOT,
@@ -3803,7 +3810,7 @@ int main(int argc, char *argv[])
 
 
 
-	strncpy(ss_version,"1.3.7\0",6);
+	strncpy(ss_version,"1.3.8\0",6);
 	strncpy(ss_name,"Signal Server\0",14);
 
 	if (argc==1)
@@ -3830,7 +3837,7 @@ int main(int argc, char *argv[])
                 fprintf(stdout,"       -R Radius (miles/kilometers)\n");
                 fprintf(stdout,"     -res Pixels per degree. 300/600/1200(default)/3600 (optional)\n");
                 fprintf(stdout,"     -t Terrain background\n");
-				fprintf(stdout,"     -pm Propagation model. 1: ITM (Default), 2: LOS, 3-5: Hata\n");
+				fprintf(stdout,"     -pm Propagation model. 1: ITM (Default), 2: LOS, 3-5: Hata, 6: COST231, 7: ITU525\n");
 				fprintf(stdout,"     -ked Knife edge diffraction (Default for ITM)\n");
 				fprintf(stdout,"     -wf Win32 SDF tile names ('=' not ':')\n");
 				fprintf(stdout,"     -dbg Debug mode\n\n");