Plane earth model and MODIS landcover clutter

models/README

@@ -5,3 +5,5 @@ Finding a reputable paper to source these models from took a while. There was
 lots of bad copy-paste out there. A good paper:
 
 http://www.cl.cam.ac.uk/research/dtg/lce-pub/public/vsa23/VTC05_Empirical.pdf
+
+Plane earth loss model taken from "Antennas and Propagation for Wireless systems" by Simon Saunders

models/los.cc

@@ -9,6 +9,7 @@
 #include "hata.hh"
 #include "itwom3.0.hh"
 #include "sui.hh"
+#include "pel.hh"
 #include <pthread.h>
 
 #define NUM_SECTIONS 4
@@ -467,7 +468,7 @@ void PlotPropPath(struct site source, struct site destination,
 						  METERS_PER_FOOT), dkm, pmenv);
 				break;
 			case 4:
-				// COST231-HATA
+				// ECC33
 				loss =
 				    ECC33pathLoss(LR.frq_mhz, txelev,
 						  path.elevation[y] +
@@ -484,6 +485,7 @@ void PlotPropPath(struct site source, struct site destination,
 						 METERS_PER_FOOT), dkm, pmenv);
 				break;
 			case 6:
+				// COST231-Hata
 				loss =
 				    COST231pathLoss(LR.frq_mhz, txelev,
 						    path.elevation[y] +
@@ -517,6 +519,11 @@ void PlotPropPath(struct site source, struct site destination,
 						     pmenv);
 				break;
 
+			case 10:
+				// Plane earth
+				loss =	PlaneEarthLoss(dkm, txelev, path.elevation[y] + (destination.alt * METERS_PER_FOOT));
+				break;
+
 			default:
 				point_to_point_ITM(source.alt * METERS_PER_FOOT,
 						   destination.alt *
@@ -529,7 +536,7 @@ void PlotPropPath(struct site source, struct site destination,
 						   loss, strmode, errnum);
 
 			}
-			
+
 			if (knifeedge == 1) {
 				diffloss =
 				    ked(LR.frq_mhz,

models/pel.cc

@@ -0,0 +1,29 @@
+/*****************************************************************************
+*  Plane Earth Path Loss model for Signal Server by Alex Farrant             *
+*  Taken from "Antennas and Propagation for wireless communication systems"  *
+*  ISBN 978-0-470-84879-1                                                    *
+*  10 August 2016							     *
+*  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 <math.h>
+
+double PlaneEarthLoss(float d, float TxH, float RxH)
+{
+/*
+Plane Earth Loss model 
+Frequency: N/A
+Distance (km): Any
+*/
+	// Plane earth loss is independent of frequency.
+	double dbloss = 40*log10(d) + 20*log10(TxH) + 20*log10(RxH);
+	return dbloss;
+}

models/pel.hh

@@ -0,0 +1,6 @@
+#ifndef _PEL_HH_
+#define _PEL_HH_
+
+double PlaneEarthLoss(float d, float TxH, float RxH);
+
+#endif /* _PEL_HH_ */