{"id":9427,"date":"2023-04-30T00:00:48","date_gmt":"2023-04-29T15:00:48","guid":{"rendered":"https:\/\/www11.ieice.org\/cs\/ap\/wp\/?page_id=9427"},"modified":"2025-12-05T19:23:36","modified_gmt":"2025-12-05T10:23:36","slug":"vegetation_loss","status":"publish","type":"page","link":"https:\/\/www.ieice.org\/cs\/ap\/misc\/denpan-db\/prop_model_db\/model_list\/vegetation_loss\/","title":{"rendered":"\u690d\u751f\u640d\u5931"},"content":{"rendered":"
<\/div>

<\/path><\/svg><\/i> \"Loading\"<\/p>

<\/div>(since 2025\/12\/5)<\/p>\n\n\n\n

\u30e2\u30c7\u30eb\u306e\u8aac\u660e<\/h3>\n\n\n\n

\u3000\u690d\u7269\uff08\u4e3b\u306b\u8449\u306e\u7e41\u3063\u305f\u6a39\u6728\uff09\u304c\u4f1d\u642c\u8def\u306b\u5b58\u5728\u3059\u308b\u5834\u5408\u3001\u4f1d\u642c\u640d\u5931\u304c\u767a\u751f\u3059\u308b\u3002\u68ee\u6797\u3067\u306f\u5730\u4e0a\u30d1\u30b9\u3068\u4e0a\u7a7a\u304b\u3089\u5230\u6765\u3059\u308b\u96fb\u6ce2\uff08\u30b9\u30e9\u30f3\u30c8\u30d1\u30b9\uff09\u306e\u4f1d\u642c\u640d\u5931\u30e2\u30c7\u30eb\u304c\u3042\u308b\u3002\u3069\u3061\u3089\u306e\u30e2\u30c7\u30eb\u3082\u6a39\u6728\u5e2f\u306e\u7d4c\u8def\u9577\uff08\u68ee\u6797\u306e\u901a\u904e\u8ddd\u96e2\uff09\u3068\u5468\u6ce2\u6570\u306b\u5fdc\u3058\u3066\u4f1d\u642c\u640d\u5931\u91cf\u304c\u5909\u5316\u3059\u308b\u3002\u307e\u305f\u3001\u69d8\u3005\u306a\u30a8\u30ea\u30a2\u3067\u306e\u5b9f\u9a13\u7d50\u679c\u306b\u57fa\u3065\u304d\u3001\u6728\u306e\u7a2e\u985e\u306b\u3088\u308b\u7279\u6027\u306e\u5909\u5316\u3092\u3001\u3053\u308c\u306b\u95a2\u4fc2\u3059\u308b\u4fc2\u6570\u3092\u7528\u3044\u3066\u8868\u3057\u3066\u3044\u308b\u3002<\/p>\n\n\n

\n
\"\"<\/figure><\/div>\n\n\n

\u3000\u68ee\u6797\u3067\u306f\u4e0b\u8a18\u306e\u3088\u3046\u306b\u5730\u4e0a\u30d1\u30b9\u3068\u4e0a\u7a7a\u304b\u3089\u5230\u6765\u3059\u308b\u96fb\u6ce2\uff08\u30b9\u30e9\u30f3\u30c8\u30d1\u30b9\uff09\u306e\u4f1d\u642c\u640d\u5931\u30e2\u30c7\u30eb\u304c\u3042\u308b\u3002<\/p>\n\n\n\n

\u3010\u68ee\u6797\uff1a\u5730\u4e0a\u30d1\u30b9\u3011<\/strong>
\\(
A_{ev} = A_m \\left[ 1 – \\exp( -d \\gamma \/ A_m ) \\right]
\\tag{1}
\\)<\/p>\n\n\n\n

\\(
A_m = A_1 \\cdot f^{ \\alpha }
\\tag{2}
\\)<\/p>\n\n\n\n

\u305f\u3060\u3057\u3001\\( \\gamma \\)\u306f\u5468\u6ce2\u6570\u306b\u3088\u308a\u5909\u5316\u3059\u308b\u3002ITU-R P.833-10\u306b\u306f\u5468\u6ce2\u6570\u3068\\( \\gamma \\)\u306e\u95a2\u4fc2\u304c\u30b0\u30e9\u30d5\uff08\u4e0b\u56f3\uff09\u3067\u793a\u3055\u308c\u3066\u3044\u308b\u3002\\( \\alpha \\)\u3001\\( A_1 \\)\u306f\u6728\u306e\u7a2e\u985e\u3068\u5468\u6ce2\u6570\u306b\u3088\u308a\u7570\u306a\u308b\u3053\u3068\u304c\u69d8\u3005\u306a\u30a8\u30ea\u30a2\u306e\u6e2c\u5b9a\u3067\u78ba\u8a8d\u3055\u308c\u3066\u3044\u308b\u3002<\/p>\n\n\n\n

\u3010\u68ee\u6797\uff1a\u4e0a\u7a7a\u304b\u3089\u5230\u6765\u3059\u308b\u96fb\u6ce2\uff08\u30b9\u30e9\u30f3\u30c8\u30d1\u30b9\uff09\u3011<\/strong><\/p>\n\n\n\n

\u3000\u4e0a\u7a7a\u304b\u3089\u5230\u6765\u3059\u308b\u96fb\u6ce2\u306e\u690d\u751f\u640d\u5931\u306f\u4ef0\u89d2\\( \\theta \\)\u3092\u5c0e\u5165\u3057\u3066\u6b21\u5f0f\u3067\u8a08\u7b97\u3055\u308c\u308b\u3002<\/p>\n\n\n\n

\\(
L = A \\cdot f^B \\cdot d^C \\cdot ( \\theta + E )^G
\\tag{3}
\\)<\/p>\n\n\n\n

\u305f\u3060\u3057\u3001\\( A \\)\u3001\\( B \\)\u3001\\( C \\)\u3001\\( E \\)\u3001\\( G \\)\u306f\u6728\u306e\u7a2e\u985e\u306b\u95a2\u4fc2\u3059\u308b\u4fc2\u6570\u3067\u3042\u308b\u3002<\/p>\n\n\n

\n
\"\"<\/figure><\/div>\n\n\n

\u30d1\u30e9\u30e1\u30fc\u30bf<\/h3>\n\n\n\n

\u5404\u63a8\u5b9a\u5f0f\u306e\u4fc2\u6570\u306e\u4ee3\u8868\u5024\u306f\u4ee5\u4e0b\u306e\u3068\u304a\u308a\u3067\u3042\u308b\u3002<\/p>\n\n\n\n

\u3000\u3000\u3000\u3000\u3010\u68ee\u6797\uff1a\u5730\u4e0a\u30d1\u30b9\u3011\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3010\u68ee\u6797\uff1a\u4e0a\u7a7a\u304b\u3089\u5230\u6765\u3059\u308b\u96fb\u6ce2\uff08\u30b9\u30e9\u30f3\u30c8\u30d1\u30b9\uff09\u3011<\/p>\n\n\n\n

\n
\n
\n
\n
\n
\n
\u4fc2\u6570 <\/td>\u30ea\u30aa\u30c7\u30b8\u30e3\u30cd\u30a4\u30ed<\/td>\u30df\u30e5\u30eb\u30fc\u30ba<\/td>\u30b5\u30f3\u30af\u30c8\u30da\u30c6\u30eb\u30d6\u30eb\u30af<\/td><\/tr>
\\( \\alpha \\)<\/td>0.752<\/td>0.43<\/td>0.42<\/td><\/tr>
\\( A_1 \\)<\/td>0.18<\/td>1.15<\/td>1.37<\/td><\/tr><\/tbody><\/table><\/figure>\n<\/div>\n<\/div>\n<\/div><\/div>\n<\/div>\n\n\n\n
\n
\n
\u4fc2\u6570<\/td>Austria pine<\/td><\/tr>
\\( A \\)<\/td>0.25<\/td><\/tr>
\\( B \\)<\/td>0.39<\/td><\/tr>
\\( C \\)<\/td>0.25<\/td><\/tr>
\\( E \\)<\/td>0<\/td><\/tr>
\\( G \\)<\/td>0.05<\/td><\/tr><\/tbody><\/table><\/figure>\n<\/div><\/div>\n<\/div>\n<\/div>\n<\/div><\/div>\n\n\n\n

<\/p>\n\n\n\n

\u3000\u3010\u68ee\u6797\uff1a\u5730\u4e0a\u30d1\u30b9\u3011\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3010\u4e0a\u7a7a\u304b\u3089\u5230\u6765\u3059\u308b\u96fb\u6ce2\uff08\u30b9\u30e9\u30f3\u30c8\u30d1\u30b9\uff09\u3011<\/p>\n\n\n\n

\n
\n
\u8a18\u53f7<\/strong><\/td>\u30d1\u30e9\u30e1\u30fc\u30bf\u8aac\u660e [\u5358\u4f4d]<\/strong><\/td>\u9069\u7528\u7bc4\u56f2<\/strong><\/td><\/tr>
\\( A_1 \\)<\/td>\u6700\u5927\u6e1b\u8870\u3092\u8a08\u7b97\u3059\u308b\u305f\u3081\u306e\u4fc2\u6570 [dB]<\/td><\/td><\/tr>
\\( d \\)<\/td>\u6a39\u6728\u5e2f\u306e\u7d4c\u8def\u9577 [m]<\/td><\/td><\/tr>
\\( f \\)<\/td>\u5468\u6ce2\u6570 [MHz]<\/td>30MHz\uff5e100,000MHz<\/td><\/tr>
\\( \\alpha \\)<\/td>\u6700\u5927\u6e1b\u8870\u3092\u8a08\u7b97\u3059\u308b\u305f\u3081\u306e\u4fc2\u6570<\/td><\/td><\/tr>
\\( \\gamma \\)<\/td>\u6e1b\u8870\u4fc2\u6570 [dB\/m]<\/td><\/td><\/tr><\/tbody><\/table><\/figure>\n<\/div>\n\n\n\n
\n
\u8a18\u53f7<\/strong><\/td>\u30d1\u30e9\u30e1\u30fc\u30bf\u8aac\u660e [\u5358\u4f4d]<\/strong><\/td>\u9069\u7528\u7bc4\u56f2<\/strong><\/strong><\/td><\/tr>
\\( f \\)<\/td>\u5468\u6ce2\u6570 [MHz]<\/td>30MHz\uff5e100,000MHz<\/td><\/tr>
\\( \\theta \\)<\/td>\u4ef0\u89d2 [degree]<\/td><\/td><\/tr>
\\( d \\)<\/td>\u68ee\u6797\u306e\u901a\u904e\u8ddd\u96e2 [m]<\/td><\/td><\/tr><\/tbody><\/table><\/figure>\n<\/div>\n<\/div>\n\n\n\n

\u8a08\u7b97\u4f8b<\/h3>\n\n\n\n

\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3010\u4e0a\u7a7a\u304b\u3089\u5230\u6765\u3059\u308b\u96fb\u6ce2\uff08\u30b9\u30e9\u30f3\u30c8\u30d1\u30b9\uff09\u3011<\/p>\n\n\n

\n
\"\"<\/figure><\/div>\n\n\n

\u53c2\u7167<\/h2>\n\n\n\n[1] ITU-R P.833-10, \u201cAttenuation in vegetation\u201d, 2021.<\/p>\n\n\n\n

\u3010\u53c2\u8003\u30111\u672c\u306e\u6728\u306b\u3088\u308b\u6e1b\u8870<\/h3>\n\n\n\n

\u30001\u672c\u306e\u6728\u306b\u3088\u308b\u6e1b\u8870\u306b\u3064\u3044\u3066\u306f\u3001ITU-R P.833-10\u306b\u8a73\u7d30\u306b\u8a18\u8f09\u3055\u308c\u3066\u3044\u308b\u3002\u4e0b\u56f3\u306e\u3088\u3046\u306b\u6728\u306e\u9802\u4e0a\u3092\u901a\u904e\u3059\u308b\u30d1\u30b9\uff08 \\(L_{top} \\)\uff09\u3001\u6728\u306e\u4e21\u5074\u3092\u901a\u904e\u3059\u308b\u30d1\u30b9\uff08\\( L_{sidea} , L_{sideb} \\)\uff09\u3001\u6728\u306e\u4e0b\u306e\u5730\u9762\u3067\u53cd\u5c04\u3057\u3066\u5230\u6765\u3059\u308b\u30d1\u30b9\uff08\\( L_{ground} \\)\uff09\u3001\u6728\u306e\u4e2d\u3092\u901a\u904e\u3059\u308b\u30d1\u30b9\uff08\\( L_{scat} \\)\uff09\u306e\u3059\u3079\u3066\u3092\u8003\u616e\u3057\u3066\u6b21\u5f0f\u3067\u8868\u305b\u308b\u3002<\/p>\n\n\n\n

\\(
L_{total} = {\\displaystyle -10 \\log_{10} \\left[ 10^{ \\frac{ -L_{sidea} }{ 10 } } + 10^{ \\frac{ -L_{sideb} }{ 10 } } + 10^{ \\frac{ -L_{top} }{ 10 } } + 10^{ \\frac{ -L_{ground} }{ 10 } } + 10^{ \\frac{ -L_{scat} }{ 10 } } \\right] }
\\tag{4}
\\)<\/p>\n\n\n\n

\u5404\u8981\u7d20\u306b\u3064\u3044\u3066\u306f\u3001ITU-R P.833-10\u53ca\u3073ITU-R P.526\u3001ITU-R P.1238\u306b\u8a73\u8ff0\u3055\u308c\u3066\u3044\u308b\u306e\u3067\u53c2\u7167\u3055\u308c\u305f\u3044\u3002<\/p>\n\n\n

\n
\"\"<\/figure><\/div>","protected":false},"excerpt":{"rendered":"

\u30e2\u30c7\u30eb\u306e\u8aac\u660e \u3000\u690d\u7269\uff08\u4e3b\u306b\u8449\u306e\u7e41\u3063\u305f\u6a39\u6728\uff09\u304c\u4f1d\u642c\u8def\u306b\u5b58\u5728\u3059\u308b\u5834\u5408\u3001\u4f1d\u642c\u640d\u5931\u304c\u767a\u751f\u3059\u308b\u3002\u68ee\u6797\u3067\u306f\u5730\u4e0a\u30d1\u30b9\u3068\u4e0a\u7a7a\u304b\u3089\u5230\u6765\u3059\u308b\u96fb\u6ce2\uff08\u30b9\u30e9\u30f3\u30c8\u30d1\u30b9\uff09\u306e\u4f1d\u642c\u640d\u5931\u30e2\u30c7\u30eb\u304c\u3042\u308b\u3002\u3069\u3061\u3089\u306e\u30e2\u30c7\u30eb\u3082\u6a39\u6728\u5e2f\u306e\u7d4c\u8def\u9577\uff08\u68ee\u6797\u306e\u901a\u904e\u8ddd\u96e2\uff09\u3068\u5468\u6ce2\u6570 […]<\/p>\n","protected":false},"author":5,"featured_media":0,"parent":12073,"menu_order":51,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"class_list":["post-9427","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.ieice.org\/cs\/ap\/wp-json\/wp\/v2\/pages\/9427","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.ieice.org\/cs\/ap\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.ieice.org\/cs\/ap\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.ieice.org\/cs\/ap\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/www.ieice.org\/cs\/ap\/wp-json\/wp\/v2\/comments?post=9427"}],"version-history":[{"count":80,"href":"https:\/\/www.ieice.org\/cs\/ap\/wp-json\/wp\/v2\/pages\/9427\/revisions"}],"predecessor-version":[{"id":14896,"href":"https:\/\/www.ieice.org\/cs\/ap\/wp-json\/wp\/v2\/pages\/9427\/revisions\/14896"}],"up":[{"embeddable":true,"href":"https:\/\/www.ieice.org\/cs\/ap\/wp-json\/wp\/v2\/pages\/12073"}],"wp:attachment":[{"href":"https:\/\/www.ieice.org\/cs\/ap\/wp-json\/wp\/v2\/media?parent=9427"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}