{"id":86,"date":"2013-05-13T08:12:09","date_gmt":"2013-05-13T13:12:09","guid":{"rendered":"http:\/\/www.charlesescobar.com\/?p=86"},"modified":"2017-06-28T14:36:47","modified_gmt":"2017-06-28T19:36:47","slug":"modelo-longley-rice-para-prediccion-de-telecomunicaciones","status":"publish","type":"post","link":"https:\/\/www.charlesescobar.com\/?p=86","title":{"rendered":"Modelo Longley Rice para predicci\u00f3n de telecomunicaciones"},"content":{"rendered":"<style type=\"text\/css\"><!--\nH3 { margin-bottom: 0.21cm; page-break-after: avoid; }H3.western { font-family: \"Arial\",sans-serif; font-size: 14pt; font-weight: bold; }H3.cjk { font-family: \"Droid Sans Fallback\"; font-size: 14pt; font-weight: bold; }H3.ctl { font-family: \"Lohit Hindi\"; font-size: 14pt; font-weight: bold; }H2 { margin-bottom: 0.21cm; page-break-after: avoid; }H2.western { font-family: \"Arial\",sans-serif; font-size: 14pt; font-style: italic; font-weight: bold; }H2.cjk { font-family: \"Droid Sans Fallback\"; font-size: 14pt; font-style: italic; font-weight: bold; }H2.ctl { font-family: \"Lohit Hindi\"; font-size: 14pt; font-style: italic; font-weight: bold; }P { margin-bottom: 0.21cm; }A:link { color: rgb(0, 0, 128); text-decoration: underline; }\n--><\/style>\n<p align=\"JUSTIFY\"><span style=\"color: #000000;\"><span style=\"font-family: Arial,sans-serif;\">El modelo Longley Rice, es un modelo matem\u00e1tico desarrollado por A. G. Longley and P. L. Rice, ESS en 1968, este m\u00e9todo se encuentra documentado y fue publicado por el gobierno de los Estados Unidos bajo el t\u00edtulo <\/span><\/span><span style=\"color: #000000;\"><span style=\"font-family: Arial,sans-serif;\"><i><b>\u00abPrediction of tropospheric radio transmission loss over irregular terrain<\/b><\/i><\/span><\/span><span style=\"color: #000000;\"><span style=\"font-family: Arial,sans-serif;\"><i>. A computer method-1968&#8243;<\/i><\/span><\/span><span style=\"color: #000000;\"><span style=\"font-family: Arial,sans-serif;\">, [1] y\u00a0 permite realizar c\u00e1lculos de propagaci\u00f3n para enlaces punto a punto y punto a zona, que son los modos de operaci\u00f3n del programa, debido a sus caracter\u00edsticas, es utilizado como motor de c\u00e1lculos de varios programas de telecomunicaciones como SPLAT! [2] y Radiomobile [3] <\/span><\/span><\/p>\n<p>&nbsp;<\/p>\n<p align=\"JUSTIFY\"><span style=\"color: #000000;\"><span style=\"font-family: Arial,sans-serif;\">Este modelo ha sido dise\u00f1ado para operar a frecuencias superiores a 20 MHz, de acuerdo al documento original, sin embargo existen referencias del rango de operaci\u00f3n de 20 MHz a 20 GHz [4] y de 20 MHz a 40 GHz [5].\u00a0 Este modelo matem\u00e1tico est\u00e1 dise\u00f1ado para usar equipos de c\u00f3mputo para desarrollar sus c\u00e1lculos, en el documento original constan los flujogramas del programa y el c\u00f3digo fuente programado para un computador \u201cControl Data Corporation CDC-3600\u201d [6]<\/span><\/span><\/p>\n<p>&nbsp;<\/p>\n<p align=\"JUSTIFY\"><span style=\"color: #000000;\"><span style=\"font-family: Arial,sans-serif;\">El Modelo Longley-Rice est\u00e1 dise\u00f1ado para ser utilizado en an\u00e1lisis de largas distancias en el que el transmisor y receptor se encuentran alejados desde 1 a 2000 Km [7]. Para el c\u00e1lculo considera las irregularidades del terreno y usa para ello el perfil del terreno y los siguientes par\u00e1metros [8]<\/span><\/span><\/p>\n<p>&nbsp;<\/p>\n<ul>\n<li>\n<p align=\"JUSTIFY\"><span style=\"color: #000000;\"><span style=\"font-family: Arial,sans-serif;\">Constante diel\u00e9ctrica de la tierra (permeabilidad relativa)<\/span><\/span><\/p>\n<\/li>\n<li>\n<p align=\"JUSTIFY\"><span style=\"color: #000000;\"><span style=\"font-family: Arial,sans-serif;\">Conductividad de la tierra (Siemens por metro)<\/span><\/span><\/p>\n<\/li>\n<li>\n<p align=\"JUSTIFY\"><span style=\"color: #000000;\"><span style=\"font-family: Arial,sans-serif;\">Constante Atmosf\u00e9rica Bending Constant (N-Unidades)<\/span><\/span><\/p>\n<\/li>\n<li>\n<p align=\"JUSTIFY\"><span style=\"color: #000000;\"><span style=\"font-family: Arial,sans-serif;\">Tipos de Clima<\/span><\/span><\/p>\n<\/li>\n<li>\n<p align=\"JUSTIFY\"><span style=\"color: #000000;\"><span style=\"font-family: Arial,sans-serif;\">Frecuencia entre 20 MHz y 20 GHz<\/span><\/span><\/p>\n<\/li>\n<li>\n<p align=\"JUSTIFY\"><span style=\"color: #000000;\"><span style=\"font-family: Arial,sans-serif;\">Polarizaci\u00f3n Horizontal y Vertical<\/span><\/span><\/p>\n<\/li>\n<li>\n<p align=\"JUSTIFY\"><span style=\"color: #000000;\"><span style=\"font-family: Arial,sans-serif;\">Estad\u00edsticamente se considera las intensidades de campo basados en el porcentaje de las ubicaciones para distintos porcentajes de tiempo a trav\u00e9s de la relaci\u00f3n de la fracci\u00f3n de situaciones con la fracci\u00f3n de tiempo<\/span><\/span><\/p>\n<\/li>\n<\/ul>\n<p align=\"JUSTIFY\">\u00a0<span style=\"color: #000000;\"><span style=\"font-family: Arial,sans-serif;\">Como muestra se presenta un segmento del c\u00f3digo fuente de SPLAT!, programado en C, en el cual, se ingresan los par\u00e1metros Longley-Rice:<\/span><\/span><\/p>\n<p align=\"JUSTIFY\">\n<table width=\"603\" cellspacing=\"0\" cellpadding=\"7\">\n<colgroup>\n<col width=\"587\" \/> <\/colgroup>\n<tbody>\n<tr>\n<td valign=\"TOP\" bgcolor=\"#dbe5f1\" width=\"587\">\n<p lang=\"en-US\" align=\"JUSTIFY\"><span style=\"color: #000000;\"><span style=\"font-family: Arial,sans-serif;\"><span style=\"font-size: xx-small;\">if (olditm)<\/span><\/span><\/span><\/p>\n<p lang=\"en-US\" align=\"JUSTIFY\"><span style=\"color: #000000;\"><span style=\"font-family: Arial,sans-serif;\"><span style=\"font-size: xx-small;\">fprintf(fd2,\u00bbLongley-Rice Parameters Used In This Analysis:nn\u00bb);<\/span><\/span><\/span><\/p>\n<p lang=\"en-US\" align=\"JUSTIFY\"><span style=\"color: #000000;\"><span style=\"font-family: Arial,sans-serif;\"><span style=\"font-size: xx-small;\">else<\/span><\/span><\/span><\/p>\n<p lang=\"en-US\" align=\"JUSTIFY\"><span style=\"color: #000000;\"><span style=\"font-family: Arial,sans-serif;\"><span style=\"font-size: xx-small;\">fprintf(fd2,\u00bbITWOM Version %.1f Parameters Used In This Analysis:nn\u00bb,ITWOMVersion());<\/span><\/span><\/span><\/p>\n<p lang=\"en-US\">\n<p lang=\"en-US\" align=\"JUSTIFY\"><span style=\"color: #000000;\"><span style=\"font-family: Arial,sans-serif;\"><span style=\"font-size: xx-small;\">fprintf(fd2,\u00bbEarth&#8217;s Dielectric Constant: %.3lfn\u00bb,LR.eps_dielect);<\/span><\/span><\/span><\/p>\n<p lang=\"en-US\" align=\"JUSTIFY\"><span style=\"color: #000000;\"><span style=\"font-family: Arial,sans-serif;\"><span style=\"font-size: xx-small;\">fprintf(fd2,\u00bbEarth&#8217;s Conductivity: %.3lf Siemens\/metern\u00bb,LR.sgm_conductivity);<\/span><\/span><\/span><\/p>\n<p lang=\"en-US\" align=\"JUSTIFY\"><span style=\"color: #000000;\"><span style=\"font-family: Arial,sans-serif;\"><span style=\"font-size: xx-small;\">fprintf(fd2,\u00bbAtmospheric Bending Constant (N-units): %.3lf ppmn\u00bb,LR.eno_ns_surfref);<\/span><\/span><\/span><\/p>\n<p lang=\"en-US\" align=\"JUSTIFY\"><span style=\"color: #000000;\"><span style=\"font-family: Arial,sans-serif;\"><span style=\"font-size: xx-small;\">fprintf(fd2,\u00bbFrequency: %.3lf MHzn\u00bb,LR.frq_mhz);<\/span><\/span><\/span><\/p>\n<p lang=\"en-US\" align=\"JUSTIFY\"><span style=\"color: #000000;\"><span style=\"font-family: Arial,sans-serif;\"><span style=\"font-size: xx-small;\">fprintf(fd2,\u00bbRadio Climate: %d (\u00ab,LR.radio_climate);<\/span><\/span><\/span><\/p>\n<p lang=\"en-US\">\n<p align=\"JUSTIFY\"><span style=\"color: #000000;\"><span style=\"font-family: Arial,sans-serif;\"><span style=\"font-size: xx-small;\">switch (LR.radio_climate)<\/span><\/span><\/span><\/p>\n<p align=\"JUSTIFY\">\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><span style=\"font-family: Times New Roman,serif;\"><span style=\"font-size: medium;\">\u00a0<\/span><\/span><\/p>\n<style type=\"text\/css\"><!--\nP { margin-bottom: 0.21cm; }A:link { color: rgb(0, 0, 128); text-decoration: underline; }\n--><\/style>\n<p align=\"JUSTIFY\"><span style=\"color: #000000;\"><span style=\"font-family: Arial,sans-serif;\"><span style=\"font-size: medium;\">[1]: <\/span><\/span><\/span><a href=\"http:\/\/www.dtic.mil\/dtic\/tr\/fulltext\/u2\/676874.pdf\"><span style=\"color: #1155cc;\"><span style=\"font-family: Arial,sans-serif;\"><span style=\"font-size: medium;\"><span style=\"text-decoration: underline;\">http:\/\/www.dtic.mil\/dtic\/tr\/fulltext\/u2\/676874.pdf<\/span><\/span><\/span><\/span><\/a><\/p>\n<p align=\"JUSTIFY\"><span style=\"color: #000000;\"><span style=\"font-family: Arial,sans-serif;\"><span style=\"font-size: medium;\">[2]<\/span><\/span><\/span><a href=\"http:\/\/www.qsl.net\/kd2bd\/splat.html\"><span style=\"color: #000000;\"><span style=\"font-family: Arial,sans-serif;\"><span style=\"font-size: medium;\">: <\/span><\/span><\/span><\/a><a href=\"http:\/\/www.qsl.net\/kd2bd\/splat.html\"><span style=\"color: #1155cc;\"><span style=\"font-family: Arial,sans-serif;\"><span style=\"font-size: medium;\"><span style=\"text-decoration: underline;\">http:\/\/www.qsl.net\/kd2bd\/splat.html<\/span><\/span><\/span><\/span><\/a><\/p>\n<p align=\"JUSTIFY\"><span style=\"color: #000000;\"><span style=\"font-family: Arial,sans-serif;\"><span style=\"font-size: medium;\">[3]: <\/span><\/span><\/span><a href=\"http:\/\/www.cplus.org\/rmw\/english1.html\"><span style=\"color: #1155cc;\"><span style=\"font-family: Arial,sans-serif;\"><span style=\"font-size: medium;\"><span style=\"text-decoration: underline;\">http:\/\/www.cplus.org\/rmw\/english1.html<\/span><\/span><\/span><\/span><\/a><\/p>\n<p align=\"JUSTIFY\"><span style=\"color: #000000;\"><span style=\"font-family: Arial,sans-serif;\"><span style=\"font-size: medium;\">[4]: <\/span><\/span><\/span><a href=\"http:\/\/en.wikipedia.org\/wiki\/Longley\u2013Rice_model\"><span style=\"color: #1155cc;\"><span style=\"font-family: Arial,sans-serif;\"><span style=\"font-size: medium;\"><span style=\"text-decoration: underline;\">http:\/\/en.wikipedia.org\/wiki\/Longley%E2%80%93Rice_model<\/span><\/span><\/span><\/span><\/a><\/p>\n<p align=\"JUSTIFY\"><span style=\"color: #000000;\"><span style=\"font-family: Arial,sans-serif;\"><span style=\"font-size: medium;\">[5]: <\/span><\/span><\/span><a href=\"http:\/\/www.awe-communications.com\/Propagation\/Rural\/ITM\/index.htm\"><span style=\"color: #1155cc;\"><span style=\"font-family: Arial,sans-serif;\"><span style=\"font-size: medium;\"><span style=\"text-decoration: underline;\">http:\/\/www.awe-communications.com\/Propagation\/Rural\/ITM\/index.htm<\/span><\/span><\/span><\/span><\/a><\/p>\n<p lang=\"en-US\" align=\"JUSTIFY\"><span style=\"color: #000000;\"><span style=\"font-family: Arial,sans-serif;\"><span style=\"font-size: medium;\">[6]: Prediction of Tropospheric Radio Transmission Loss Over Irregular Terrain &#8211; A Computer Method &#8211; 1968, p\u00e1gina 3-24<\/span><\/span><\/span><\/p>\n<p align=\"JUSTIFY\"><span style=\"color: #000000;\"><span style=\"font-family: Arial,sans-serif;\"><span style=\"font-size: medium;\">[7]: <\/span><\/span><\/span><a href=\"http:\/\/www.softwright.com\/faq\/engineering\/prop_longley_rice.html\"><span style=\"color: #1155cc;\"><span style=\"font-family: Arial,sans-serif;\"><span style=\"font-size: medium;\"><span style=\"text-decoration: underline;\">http:\/\/www.softwright.com\/faq\/engineering\/prop_longley_rice.html<\/span><\/span><\/span><\/span><\/a><\/p>\n<p align=\"JUSTIFY\"><span style=\"color: #000000;\"><span style=\"font-family: Arial,sans-serif;\"><span style=\"font-size: medium;\">[8]: Para desglosar los par\u00e1metros se ha usado como base la documentaci\u00f3n del programa SPLAT!, el cual est\u00e1 licenciado como GNU\/GPL y permite acceso libre a la documentaci\u00f3n y c\u00f3digo fuente y basa su funcionamiento en los modelos Longley-Rice e ITWOM, seleccionado por el usuario<\/span><\/span><\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>El modelo Longley Rice, es un modelo matem\u00e1tico desarrollado por A. G. Longley and P. L. Rice, ESS en 1968, este m\u00e9todo se encuentra documentado y fue publicado por el gobierno de los Estados Unidos bajo el t\u00edtulo \u00abPrediction of &#8230; <a class=\"more-link\" href=\"https:\/\/www.charlesescobar.com\/?p=86\">Leer m\u00e1s &raquo;<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"jetpack_post_was_ever_published":false},"categories":[6],"tags":[],"class_list":["post-86","post","type-post","status-publish","format-standard","hentry","category-splat"],"jetpack_publicize_connections":[],"jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/p3vibM-1o","jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/www.charlesescobar.com\/index.php?rest_route=\/wp\/v2\/posts\/86","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.charlesescobar.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.charlesescobar.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.charlesescobar.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.charlesescobar.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=86"}],"version-history":[{"count":1,"href":"https:\/\/www.charlesescobar.com\/index.php?rest_route=\/wp\/v2\/posts\/86\/revisions"}],"predecessor-version":[{"id":246,"href":"https:\/\/www.charlesescobar.com\/index.php?rest_route=\/wp\/v2\/posts\/86\/revisions\/246"}],"wp:attachment":[{"href":"https:\/\/www.charlesescobar.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=86"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.charlesescobar.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=86"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.charlesescobar.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=86"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}