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

\u30e2\u30c7\u30eb\u306e\u6982\u8981<\/h3>\n\n\n\n

\u3000\u96fb\u6ce2\u306f\u96e8\u6ef4\u306b\u5f53\u305f\u308b\u3068\u5438\u53ce\u30fb\u6563\u4e71\u304c\u8d77\u3053\u308b\u3002\u96e8\u6ef4\u306f\u640d\u5931\u3092\u3082\u3064\u8a98\u96fb\u4f53\u3067\u3042\u308a\u3001\u96e8\u6ef4\u534a\u5f84\u306f\u9727\u306e\u69d8\u306b\u975e\u5e38\u306b\u5c0f\u3055\u306a\u3082\u306e\u304b\u3089\u6700\u59273.5 mm\u7a0b\u5ea6\u307e\u3067\u5206\u5e03\u3057\u3066\u3044\u308b\u306e\u3067\u3001\u6ce2\u9577\u304c\u77ed\u3044\u30de\u30a4\u30af\u30ed\u6ce2\u5e2f\u30fb\u30df\u30ea\u6ce2\u5e2f\u3067\u306f\u964d\u96e8\u306b\u3088\u308b\u6e1b\u8870\u304c\u554f\u984c\u3068\u306a\u308b\u3002\u964d\u96e8\u6e1b\u8870\u3092\u88dc\u511f\u3059\u308b\u305f\u3081\u306b\u9001\u4fe1\u96fb\u529b\u3092\u5927\u304d\u304f\u3059\u308b\u50be\u5411\u304c\u3042\u308b\u304c\u3001\u305d\u3046\u3059\u308b\u3068\u964d\u96e8\u6563\u4e71\u306b\u3088\u308b\u5e72\u6e09\u304c\u554f\u984c\u3068\u306a\u308b\u3002\u3059\u306a\u308f\u3061\u3001\u964d\u96e8\u6e1b\u8870\u306f\u5358\u4e00\u306e\u7121\u7dda\u901a\u4fe1\u30b7\u30b9\u30c6\u30e0\u306e\u56de\u7dda\u8a2d\u8a08\u306b\u304a\u3044\u3066\u5e0c\u671b\u6ce2\u306e\u53d7\u4fe1\u30ec\u30d9\u30eb\u304c\u4f4e\u4e0b\u3059\u308b\u8981\u56e0\u3068\u3057\u3066\u8003\u616e\u3055\u308c\u308b\u4f1d\u642c\u640d\u5931\u3067\u3042\u308b\u306e\u306b\u5bfe\u3057\u3066\u3001\u964d\u96e8\u6563\u4e71\u306f\u7570\u306a\u308b2\u3064\u4ee5\u4e0a\u306e\u7121\u7dda\u901a\u4fe1\u30b7\u30b9\u30c6\u30e0\u3067\u540c\u4e00\u5468\u6ce2\u6570\u3092\u5171\u7528\u3059\u308b\u969b\u306b\u4ed6\u306e\u30b7\u30b9\u30c6\u30e0\u304b\u3089\u306e\u5e72\u6e09\u6ce2\uff08\u6563\u4e71\u6ce2\uff09\u306e\u53d7\u4fe1\u30ec\u30d9\u30eb\u3092\u8a55\u4fa1\u3059\u308b\u305f\u3081\u306b\u8003\u616e\u3055\u308c\u308b\u4f1d\u642c\u640d\u5931\u3067\u3042\u308b\u3002\u964d\u96e8\u6563\u4e71\u7279\u6027\u306e\u8a55\u4fa1\u306f\u540c\u4e00\u5468\u6ce2\u6570\u306e2\u3064\u306e\u7570\u306a\u308b\u30b7\u30b9\u30c6\u30e0\u306e\u30e1\u30a4\u30f3\u30d3\u30fc\u30e0\u304c\u5171\u901a\u306e\u964d\u96e8\u30bb\u30eb\u5185\u3067\u4ea4\u5dee\u3059\u308b\u5834\u5408\u306b\u91cd\u8981\u3067\u3042\u308a\u3001\u964d\u96e8\u5f37\u5ea6\u3084\u964d\u96e8\u30bb\u30eb\uff08\u4e00\u69d8\u306b\u96e8\u304c\u964d\u308b\u7bc4\u56f2\uff09\u306e\u5927\u304d\u3055\u306a\u3069\u306b\u5f71\u97ff\u3059\u308b\u3002\u5b87\u5b99\u901a\u4fe1\u7528\u306b\u5272\u308a\u5f53\u3066\u3089\u308c\u305f\u5468\u6ce2\u6570\u306f\u3001\u901a\u5e38\u3001\u5730\u4e0a\u696d\u52d9\u3068\u5171\u7528\u306b\u306a\u3063\u3066\u3044\u308b\u305f\u3081\u3001\u5730\u7403\u5c40\u307e\u305f\u306f\u5730\u4e0a\u5c40\u9593\u306b\u304a\u3051\u308b\u5e72\u6e09\u304c\u554f\u984c\u3068\u306a\u308b\u3002\u964d\u96e8\u6563\u4e71\u306b\u3088\u308b\u5e72\u6e09\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u4f1d\u642c\u8def\u3067\u8d77\u3053\u308a\u5f97\u308b\u3002<\/p>\n\n\n\n

\uff08\u30e2\u30fc\u30c9B1\uff09\u5b87\u5b99\u5c40\u307e\u305f\u306f\u4e0a\u7a7a\u5c40\u3000\u2192\u3000\u5225\u30b7\u30b9\u30c6\u30e0\u306e\u5730\u7403\u5c40
\uff08\u30e2\u30fc\u30c9B2\uff09\u5730\u4e0a\u5c40\u3000\u2192\u3000\u5225\u30b7\u30b9\u30c6\u30e0\u306e\u5b87\u5b99\u5c40\u307e\u305f\u306f\u4e0a\u7a7a\u5c40
\uff08\u30e2\u30fc\u30c9C1\uff09\u5b87\u5b99\u5c40\u307e\u305f\u306f\u4e0a\u7a7a\u5c40\u3000\u2192\u3000\u5730\u4e0a\u5c40
\uff08\u30e2\u30fc\u30c9C2\uff09\u5730\u4e0a\u5c40\u3000\u2192\u3000\u5b87\u5b99\u5c40\u307e\u305f\u306f\u4e0a\u7a7a\u5c40<\/p>\n\n\n\n

\u3000\u96fb\u6ce2\u4f1d\u642c\u30cf\u30f3\u30c9\u30d6\u30c3\u30af\u304a\u3088\u3073ITU-R\u52e7\u544aP.619-5\u3067\u306f\u30015 GHz\u4ee5\u4e0a\u306e\u5468\u6ce2\u6570\u3067\u5f71\u97ff\u304c\u3042\u308b\u3068\u3055\u308c\u3066\u3044\u308b\u3002ITU-R\u52e7\u544aP.452-17\u3067\u306f\u30010.1 GHz\u4ee5\u4e0a\u306e\u5468\u6ce2\u6570\u3067\u8a08\u7b97\u53ef\u80fd\u306a\u30e2\u30c7\u30eb\u304c\u8a18\u8f09\u3055\u308c\u3066\u3044\u308b\u3002P.619-5\u306e\u4ed8\u9332F\u306b\u306f\u3001\u964d\u96e8\u6563\u4e71\u304c\u5b58\u5728\u3057\u306a\u3044\u5834\u5408\u3092\u8a55\u4fa1\u3067\u304d\u308b\u30b7\u30f3\u30d7\u30eb\u306a\u6570\u5f0f\u304c\u8a18\u8f09\u3055\u308c\u3066\u3044\u308b\u3002\u3053\u3053\u3067\u306fITU-R\u52e7\u544aP.452-17\u306e5\u7ae0\u306e\u30d0\u30a4\u30b9\u30bf\u30c6\u30a3\u30c3\u30af\u30ec\u30fc\u30c0\u30fc\u65b9\u7a0b\u5f0f\u306b\u3088\u308b\u8a08\u7b97\u65b9\u6cd5\u3092\u53c2\u7167\u3057\u3066\u3044\u308b\u3002<\/p>\n\n\n\n

\u3053\u3053\u3067\u7d39\u4ecb\u3059\u308b\u8a08\u7b97\u65b9\u6cd5\u3067\u306f\u3001\u540c\u4e00\u5468\u6ce2\u6570\u306e2\u3064\u306e\u7570\u306a\u308b\u30b7\u30b9\u30c6\u30e0\u306e\u5c40\u306b\u304a\u3044\u3066\u5e72\u6e09\u304c\u6700\u5927\u3068\u306a\u308b\u5834\u5408\u3059\u306a\u308f\u3061\u6700\u60aa\u5024\u3092\u8a55\u4fa1\u3059\u308b\u3002\u6700\u60aa\u5024\u306e\u30b1\u30fc\u30b9\u3092\u60f3\u5b9a\u3059\u308b\u305f\u3081\u306b\u3001\u307e\u305a\u4e00\u65b9\u306e\u5c40\uff08\u5c401\uff09\u306e\u30e1\u30a4\u30f3\u30d3\u30fc\u30e0\u4e0a\u306b\u964d\u96e8\u30bb\u30eb\u4e2d\u5fc3\u304c\u3042\u308b\u3068\u4eee\u5b9a\u3057\u3001\u3082\u3046\u4e00\u65b9\u306e\u5c40\uff08\u5c402\uff09\u304b\u3089\u306e\u5e72\u6e09\u6ce2\u306e\u53d7\u4fe1\u30ec\u30d9\u30eb\u304c\u6700\u5927\u3068\u306a\u308b\u4f4d\u7f6e\u306b\u964d\u96e8\u30bb\u30eb\u3092\u56fa\u5b9a\u3059\u308b\u3002\u3053\u306e\u3068\u304d\u3001\u964d\u96e8\u5f37\u5ea6\u306a\u3069\u306e\u6c17\u8c61\u30d1\u30e9\u30e1\u30fc\u30bf\u304a\u3088\u3073\u4e21\u5c40\u306e\u4f4d\u7f6e\u60c5\u5831\u3084\u30a2\u30f3\u30c6\u30ca\u5229\u5f97\u306a\u3069\u3092\u7528\u3044\u308b\u3053\u3068\u3067\u964d\u96e8\u6563\u4e71\u306b\u3088\u308b\u5e72\u6e09\u6ce2\u306e\u4f1d\u642c\u640d\u5931\u3092\u8a08\u7b97\u3067\u304d\u308b\u3002\u4e21\u5c40\u3092\u5165\u308c\u66ff\u3048\u3066\u540c\u69d8\u306e\u8a08\u7b97\u3092\u884c\u3044\u3001\u4f1d\u642c\u640d\u5931\u304c\u5c0f\u3055\u3044\u65b9\u3092\u6700\u60aa\u5024\u3068\u3059\u308b\u3002\u3053\u306e\u3088\u3046\u306b\u540c\u4e00\u5468\u6ce2\u6570\u306e2\u3064\u306e\u7570\u306a\u308b\u30b7\u30b9\u30c6\u30e0\u306e\u5c40\u306b\u304a\u3051\u308b\u5e72\u6e09\u3092\u8a55\u4fa1\u3067\u304d\u308b\u3002<\/p>\n\n\n\n

\u3000\u964d\u96e8\u30bb\u30eb\u306f\u5186\u7b52\u72b6\u3068\u307f\u306a\u3059\u3053\u3068\u304c\u3067\u304d\u3001\u964d\u96e8\u30bb\u30eb\u5185\u3067\u306f\u9ad8\u5ea6\u3084\u964d\u96e8\u30bb\u30eb\u4e2d\u5fc3\u304b\u3089\u306e\u8ddd\u96e2\u306b\u4f9d\u3089\u305a\u964d\u96e8\u5f37\u5ea6\u306f\u4e00\u5b9a\u3068\u4eee\u5b9a\u3057\u3066\u4f1d\u642c\u640d\u5931\u304c\u8a08\u7b97\u3055\u308c\u308b\u3002\u4efb\u610f\u306e\u30a2\u30f3\u30c6\u30ca\u30d1\u30bf\u30fc\u30f3\u3092\u4f7f\u7528\u3067\u304d\u308b\u305f\u3081\u3001\u4e21\u5c40\u306e\u30e1\u30a4\u30f3\u30d3\u30fc\u30e0\u304c\u964d\u96e8\u30bb\u30eb\u5185\u3067\u4ea4\u5dee\u3057\u306a\u3044\u5834\u5408\u3067\u3042\u3063\u3066\u3082\u3001\u5186\u7b52\u72b6\u306e\u964d\u96e8\u30bb\u30eb\u3092\u7a4d\u5206\u533a\u9593\u3068\u3057\u3066\u7a4d\u5206\u3059\u308b\u306e\u3067\u30b5\u30a4\u30c9\u30ed\u30fc\u30d6\u7b49\u306b\u304a\u3051\u308b\u5e72\u6e09\u3082\u8a55\u4fa1\u3067\u304d\u308b\uff08\u56f3a\u3001b\u53c2\u7167\uff09\u3002\u307e\u305f\u3001\u3044\u305a\u308c\u304b\u306e\u5c40\u307e\u305f\u306f\u4e21\u5c40\u304c\u964d\u96e8\u30bb\u30eb\u5185\u306b\u5b58\u5728\u3059\u308b\u5834\u5408\u3082\u8a08\u7b97\u53ef\u80fd\u3067\u3042\u308b\u3002\u3053\u306e\u3068\u304d\u3001\u964d\u96e8\u30bb\u30eb\u5185\u306b\u5b58\u5728\u3059\u308b\u5c40\u304b\u3089\u964d\u96e8\u30bb\u30eb\u4e2d\u5fc3\u3078\u306e\u30d3\u30fc\u30e0\u306e\u4ef0\u89d2\u306f\u5927\u304d\u3044\u3053\u3068\u304c\u4e88\u60f3\u3055\u308c\u308b\uff08\u56f3c\u3001d\u53c2\u7167\uff09\u3002<\/p>\n\n\n\n

\u5186\u7b52\u72b6\u306e\u964d\u96e8\u30bb\u30eb\u5185\u306b\u304a\u3044\u3066\u5c401,2\u304b\u3089\u306e\u96fb\u6ce2\u304c\u4ea4\u5dee\u3057\u5e72\u6e09\u304c\u767a\u751f\u3057\u5f97\u308b\u3068\u304d\u3001\uff08i\uff09\\(h_R\\)\u4ee5\u4e0b\u3067\u30d3\u30fc\u30e0\u304c\u4ea4\u5dee\u3059\u308b\u5834\u5408\u3001\uff08ii\uff09\\(h_R\\)\u4ee5\u4e0a\u3067\u30d3\u30fc\u30e0\u304c\u4ea4\u5dee\u3059\u308b\u304b\u3064\u4f1d\u642c\u8def\u304c\\(h_R\\)\u4ee5\u4e0b\u306e\u964d\u96e8\u30bb\u30eb\u5185\u3092\u901a\u904e\u3059\u308b\u5834\u5408\u3001\uff08iii\uff09\\(h_R\\)\u4ee5\u4e0a\u3067\u30d3\u30fc\u30e0\u304c\u4ea4\u5dee\u3059\u308b\u304b\u3064\u4f1d\u642c\u8def\u304c\\(h_R\\)\u4ee5\u4e0b\u306e\u964d\u96e8\u30bb\u30eb\u5185\u3092\u901a\u904e\u3057\u306a\u3044\u5834\u5408\u306b\u5206\u3051\u3089\u308c\u308b\u304c\u3001\u7a4d\u5206\u8a08\u7b97\u3067\u306f\uff08i\uff09\u3068\uff08ii, iii\uff09\u306e2\u3064\u306e\u5834\u5408\u3067\u8a08\u7b97\u5f0f\u304c\u7570\u306a\u308b\uff08\u56f3e\u53c2\u7167\uff09\u3002\u3053\u306e\u3068\u304d\u3001\u3044\u305a\u308c\u304b\u306e\u5c40\u304b\u3089\u964d\u96e8\u30bb\u30eb\u307e\u3067\u304c\u5730\u5f62\u306a\u3069\u306b\u3088\u308a\u906e\u853d\u3055\u308c\u308b\u5834\u5408\u306b\u306f\u7a4d\u5206\u533a\u9593\u306e\u9ad8\u3055\u4e0b\u9650\\(h_{min}\\)\u306f\u898b\u901a\u3057\u7dda\u306e\u4ea4\u70b9\u306e\u4e0b\u9650\u3068\u306a\u308a\u3001\u9ad8\u3055\u4e0a\u9650\\(h_{top}\\)\u306f15 km\u3067\u5341\u5206\u3068\u3055\u308c\u3066\u3044\u308b\u3002\u964d\u96e8\u30bb\u30eb\u5916\u3067\u306f\u5c40\u304b\u3089\u964d\u96e8\u30bb\u30eb\u7aef\u307e\u3067\u306e\u8ddd\u96e2\u306b\u5fdc\u3058\u3066\u96e8\u306e\u5e83\u304c\u308a\u3092\u8003\u616e\u3057\u305f\u8ffd\u52a0\u640d\u5931\u304c\u8a08\u7b97\u3055\u308c\u308b\u3002<\/p>\n\n\n

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

\u6570\u5f0f<\/h3>\n\n\n\n

\u964d\u96e8\u6563\u4e71\u304c\u767a\u751f\u3059\u308b\u5834\u5408\u306e2\u5c40\u9593\u306e\u4f1d\u642c\u640d\u5931[dB]\u306f\u4ee5\u4e0b\u306e\u5f0f\u3067\u8868\u3055\u308c\u308b\u3002<\/p>\n\n\n\n

\\(
L = 178 – \\log N – 20 \\log f – 10 \\log Z_R – 10 \\log (C_b + C_a) – 10 \\log S + A_g – M
\\tag{1}
\\)<\/p>\n\n\n\n

\u3053\u3053\u3067\u3001<\/p>\n\n\n\n

\u3000\\( N \\) : \u5c48\u6298\u7387\u4f9d\u5b58\u306e\u30ec\u30a4\u30ea\u30fc\u6563\u4e71\u9805\u3000\\( N = \\left| \\frac{ m^2 – 1 }{ m^2 + 2 } \\right|^2 \\)<\/p>\n\n\n\n

\u3000\\( m \\) : \u5468\u6ce2\u6570\u3084\u5927\u6c17\u6761\u4ef6\u306b\u4f9d\u5b58\u3059\u308b\u8907\u7d20\u5c48\u6298\u7387\u3000\u203bITU-R\u52e7\u544aP.2040\u53c2\u7167<\/p>\n\n\n\n

\u3000\\( f \\) : \u5468\u6ce2\u6570 [GHz]\n\n\n\n

\u3000\\( Z_R \\) : \u5730\u4e0a\u3067\u306e\u30ec\u30fc\u30c0\u30fc\u53cd\u5c04\u7387\u3000\\( Z_R = 400 R^{1.4} \\)<\/p>\n\n\n\n

\u3000\\( R \\) : \u964d\u96e8\u5f37\u5ea6 [mm\/h]\n\n\n\n

\u3000\\( 10 \\log S \\) : 10 GHz\u4ee5\u4e0a\u306e\u5468\u6ce2\u6570\u3067\u30ec\u30a4\u30ea\u30fc\u6563\u4e71\u304b\u3089\u306e\u305a\u308c\u8003\u616e\u3057\u305f\u88dc\u6b63\u9805 [dB]\n\n\n\n

\u3000\\( A_g \\) : \u9001\u4fe1\u6a5f\u304b\u3089\u53d7\u4fe1\u6a5f\u307e\u3067\u306e\u7d4c\u8def\u306b\u304a\u3051\u308b\u5927\u6c17\u30ac\u30b9\u306b\u3088\u308b\u6e1b\u8870 [dB]\n\n\n\n

\u3000\\( M \\) : \u9001\u53d7\u4fe1\u30b7\u30b9\u30c6\u30e0\u9593\u306e\u504f\u6ce2\u4e0d\u6574\u5408\u306b\u3088\u308b\u640d\u5931 [dB]\n\n\n\n

\u3000\\( C_{a,b} \\) : \u6563\u4e71\u4f1d\u9054\u95a2\u6570<\/p>\n\n\n\n

\\( 10 \\log S \\)[dB]\u306f10 GHz\u4ee5\u4e0a\u306e\u5468\u6ce2\u6570\u3067\u30ec\u30a4\u30ea\u30fc\u6563\u4e71\u304b\u3089\u306e\u305a\u308c\u3092\u8003\u616e\u3057\u305f\u88dc\u6b63\u9805\u3067\u3042\u308a\u4ee5\u4e0b\u306e\u5f0f\u3067\u8868\u3055\u308c\u308b\u300210 GHz\u4ee5\u4e0b\u306e\u5468\u6ce2\u6570\u3067\u306f\u30ec\u30a4\u30ea\u30fc\u6563\u4e71\u306b\u5f93\u3046\u305f\u3081\u4ee5\u4e0b\u306e\u5f0f\u306e\u901a\u308a\\( 10 \\log S \\)\\( = \\)\\( 0 \\)\u3068\u306a\u308b\u3002<\/p>\n\n\n\n

\\(
10 \\log S = \\left\\{
\\begin{array}{ll}
\\begin{array}{r}
{\\displaystyle
R^{0.4} \\cdot 10^{-3} \\left\\{ 4(f – 10)^{1.6} \\left( \\frac{ 1 + \\cos \\varphi_s }{ 2 } \\right) + \\right.
} \\\\
{\\displaystyle
\\left. 5(f – 10)^{1.7} \\left( \\frac{ 1 + \\cos \\varphi_s }{ 2 } \\right) \\right\\}
}
\\end{array}
& {\\rm for} \\ f > 10 \\ {\\rm GHz} \\\\
0
& {\\rm for} \\ f \\leq 10 \\ {\\rm GHz}
\\end{array}
\\right. \\\\
\\tag{2}
\\)<\/p>\n\n\n\n

\u3053\u3053\u3067\u3001<\/p>\n\n\n\n

\u3000\\( \\varphi_S \\) : 2\u5c40\u304a\u3088\u3073\u964d\u96e8\u30bb\u30eb\u306e\u4f4d\u7f6e\u306b\u3088\u3063\u3066\u8a08\u7b97\u3055\u308c\u308b\u6563\u4e71\u89d2 [rad]\n\n\n\n

2\u5c40\u306b\u6307\u5411\u6027\u30a2\u30f3\u30c6\u30ca\u3092\u7528\u3044\u305f\u969b\u306b\\( \\varphi_S \\)>0.001[rad]\u3067\u3042\u308b\u5834\u5408\u306f\u4e21\u30d3\u30fc\u30e0\u304c\u5e73\u884c\u3068\u307f\u306a\u305b\u308b\u305f\u3081\u964d\u96e8\u6563\u4e71\u306e\u5f71\u97ff\u306f\u7121\u8996\u3067\u304d\u308b\u3002<\/p>\n\n\n\n

\\( C_{a,b} \\)\u306f\u6563\u4e71\u4f1d\u9054\u95a2\u6570\u3067\u3042\u308a\u4ee5\u4e0b\u306e\u5f0f\u3067\u8868\u3055\u308c\u308b\u3002\u8a73\u7d30\u306a\u8a08\u7b97\u65b9\u6cd5\u306fITU-R\u52e7\u544aP.452-17\u306e5\u7ae0\u3092\u53c2\u7167\u3057\u3066\u9802\u304d\u305f\u3044\u3002\u672c\u30da\u30fc\u30b8\u4e0b\u90e8\u306b\\( C_{a,b} \\)\u304a\u3088\u3073\\( \\varphi_S \\)\u3092\u8a08\u7b97\u3059\u308bMATLAB\u30b3\u30fc\u30c9\u3092\u63d0\u4f9b\u3059\u308b\u3002<\/p>\n\n\n\n

\\(
\\begin{multline}
C_a =
{\\displaystyle
\\int_{ h_{R} }^{ h_{\\it top} } \\int_{ 0 }^{ 2 \\pi } \\int_{ 0 }^{ \\frac{ d_c }{ 2 } }
\\frac{ G_1 G_2 }{ r_{ {\\it A} {\\rm 1} }^2 r_{ {\\it A} {\\rm 2} }^2 }
\\exp \\left\\{ -k( 6.5(h – h_R) + \\gamma_{ {\\it R} {\\rm 1} } f_{ {\\it x} {\\rm 1} } + \\gamma_{ {\\it R} {\\rm 2} } f_{ {\\it x} {\\rm 2} } + \\right.
} \\\\
\\left. A_{ {\\it ext} {\\rm 1} } + A_{ {\\it ext} {\\rm 2} } ) \\right\\} \\cdot r \\ dr d \\varphi dh
\\end{multline}
\\tag{3}
\\)<\/p>\n\n\n\n

\\(
\\begin{multline}
C_b =
{\\displaystyle
\\int_{ h_{\\rm min} }^{ h_{R} } \\int_{ 0 }^{ 2 \\pi } \\int_{ 0 }^{ \\frac{ d_c }{ 2 } }
\\frac{ G_1 G_2 }{ r_{ {\\it A} {\\rm 1} }^2 r_{ {\\it A} {\\rm 2} }^2 }
\\exp \\left\\{ -k( \\gamma_{ {\\it R} {\\rm 1} } x_1 + \\gamma_{ {\\it R} {\\rm 2} } x_2 + \\right.
} \\\\
\\left. A_{ {\\it ext} {\\rm 1} } + A_{ {\\it ext} {\\rm 2} } ) \\right\\} \\cdot r \\ dr d \\varphi dh
\\end{multline}
\\tag{4}
\\)<\/p>\n\n\n\n

\u3053\u3053\u3067\u3001<\/p>\n\n\n\n

\u3000\\( r_{A1,2} \\) : \u5c401,2\u304b\u3089\u964d\u96e8\u30bb\u30eb\u5185\u306e\u7a4d\u5206\u8981\u7d20\u307e\u3067\u306e\u8ddd\u96e2 [km]\n\n\n\n

\u3000\\( k \\) : \u640d\u5931\u306e\u5358\u4f4d\u3092\u30c7\u30b7\u30d9\u30eb\uff08dB\uff09\u304b\u3089\u30cd\u30fc\u30d1\u30fc\uff08Np\uff09\u3078\u5909\u63db\u3059\u308b\u305f\u3081\u306e\u5b9a\u6570\uff08=0.23026\uff09<\/p>\n\n\n\n

\u3000\\( \\gamma_{R1,2} \\) : \u5c401,2\u306b\u304a\u3051\u308b\u964d\u96e8\u6e1b\u8870\u4fc2\u6570 [dB\/km]\u3000\u203bITU-R\u52e7\u544aP.838\u53c2\u7167<\/p>\n\n\n\n

\u3000\\( A_{ext1,2} \\) : \u964d\u96e8\u30bb\u30eb\u306e\u5916\u5074\u306e\u6e1b\u8870\u91cf [dB]
<\/p>\n\n\n\n

\uff1c\u6570\u5f0f\u306e\u30e1\u30e2\uff1e<\/p>\n\n\n\n

\u30fb\u5f0f\u4e2d\u306e \\( \\log \\) \u306f\u5e38\u7528\u5bfe\u6570\u3067\u3042\u308b\u3002<\/p>\n\n\n\n

\u30fbdB\uff08decibel\uff1a\u30c7\u30b7\u30d9\u30eb\uff09\u306f\u5e38\u7528\u5bfe\u6570\u3001Np\uff08neper\uff1a\u30cd\u30fc\u30d1\u30fc\u3001\u30cd\u30a4\u30d4\u30a2\u3001\u30cd\u30fc\u30d4\u30a2\uff09\u306f\u81ea\u7136\u5bfe\u6570\u306b\u57fa\u3065\u304f\u5bfe\u6570\u30b9\u30b1\u30fc\u30eb\u306e\u7121\u6b21\u5143\u5358\u4f4d\u3067\u3042\u308b\u3002\u3053\u3053\u3067\u30011 Np \u2248 8.686 dB\u3067\u3042\u308b\u3002<\/p>\n\n\n\n

\u30fb\u4e00\u822c\u7684\u306b\u3001\u30a2\u30f3\u30c6\u30ca\u30d1\u30bf\u30fc\u30f3\u306f\u5ea6\u6570\uff08degree\uff09\u5358\u4f4d\u3054\u3068\u306b\u7b97\u51fa\u3055\u308c\u308b\u306e\u306b\u5bfe\u3057\u3066\u3001\u4e09\u89d2\u95a2\u6570\u306f\u30e9\u30b8\u30a2\u30f3\uff08radian\uff09\u5358\u4f4d\u3067\u8a08\u7b97\u3055\u308c\u308b\u3053\u3068\u304c\u591a\u3044\u306e\u3067\u3001\u30e9\u30b8\u30a2\u30f3\u304b\u3089\u5ea6\u6570\u3078\uff08\u307e\u305f\u306f\u5ea6\u6570\u304b\u3089\u30e9\u30b8\u30a2\u30f3\u3078\uff09\u306e\u5909\u63db\u304c\u5fc5\u8981\u3067\u3042\u308b\u3053\u3068\u306b\u6ce8\u610f\u3059\u308b\u3002<\/p>\n\n\n\n

\u30fbITU-R\u52e7\u544aP.452-17\u3067\u306f\u3001\u6570\u5024\u8a08\u7b97\u30bd\u30d5\u30c8\u30a6\u30a7\u30a2\u306b\u7a4d\u5206\u95a2\u6570\u304c\u5185\u5728\u3057\u3066\u3044\u306a\u3044\u5834\u5408\u306e\u305f\u3081\u306b\u8fd1\u4f3c\u7684\u306a\u6570\u5024\u7a4d\u5206\u306e\u8a08\u7b97\u65b9\u6cd5\u3092\u7d39\u4ecb\u3057\u3066\u3044\u308b\u3002<\/p>\n\n\n\n

\u30fbITU-R\u52e7\u544aP.452-17\u306e\uff08126\uff09\u5f0f\u3067\u306f\\( \\delta \\alpha’_2 \\)\u3068\u3044\u3046\u30d1\u30e9\u30e1\u30fc\u30bf\u304c\u7528\u3044\u3089\u308c\u3066\u3044\u308b\u304c\\( \\delta \\alpha_2 \\)\u304c\u6b63\u3057\u305d\u3046\u3067\u3042\u308b\u3002<\/p>\n\n\n\n

\uff1c\u53c2\u8003\u56f3\u9762\uff1e<\/p>\n\n\n

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

\uff1c\u53c2\u8003\uff1e<\/p>\n\n\n\n

\u964d\u96e8\u306b\u95a2\u3059\u308b\u7528\u8a9e<\/strong>
\u30fb\u300c\u5927\u6c17\u6c34\u8c61\u300d\u300c\u30cf\u30a4\u30c9\u30ed\u30e1\u30c6\u30aa\u30fc\u30eb\uff08hydrometeor\uff09\u300d\uff1a\u96e8\u3001\u96ea\u3001\u971c\u306a\u3069\u306e\u5927\u6c17\u4e2d\u306e\u6db2\u4f53\u307e\u305f\u306f\u56fa\u4f53\u306b\u9650\u3089\u305a\u3001\u5730\u4e0a\u304b\u3089\u821e\u3044\u4e0a\u3052\u3089\u308c\u305f\u3001\u307e\u305f\u306f\u7269\u4f53\u306b\u4ed8\u7740\u3057\u305f\u6c34\u304c\u5f15\u304d\u8d77\u3053\u3059\u73fe\u8c61
\u30fb\u300c\u964d\u6c34\uff08precipitation\uff09\u300d\uff1a\u96e8\u3084\u96ea\u306a\u3069\u306e\u5fae\u5c0f\u306a\u6c34\u6ef4\u307e\u305f\u306f\u6c37\u7247\u304c\u96f2\u304b\u3089\u843d\u4e0b\u3059\u308b\u73fe\u8c61
\u30fb\u300c\u964d\u96e8\uff08rain\uff09\u300d\uff1a\u843d\u4e0b\u7269\u304c\u6c34\u6ef4\u306e\u5834\u5408<\/p>\n\n\n\n

\u964d\u96e8\u6563\u4e71\u3068\u6ce2\u9577\u3068\u306e\u95a2\u4fc2<\/strong>
\u6ce2\u9577\u304c\u96e8\u6ef4\u534a\u5f84\u306b\u6bd4\u3079\u3066\u975e\u5e38\u306b\u9577\u3044\u5834\u5408\u306fRayleigh\u6563\u4e71\u3001\u975e\u5e38\u306b\u77ed\u3044\u5834\u5408\u306f\u5149\u5b66\u8fd1\u4f3c\u306e\u5f0f\u3001\u6ce2\u9577\u304c\u96e8\u6ef4\u30b5\u30a4\u30ba\u3068\u540c\u7a0b\u5ea6\u3068\u306a\u308b\u30de\u30a4\u30af\u30ed\u6ce2\u5e2f\u30fb\u30df\u30ea\u6ce2\u5e2f\u3067\u306fMie\u6563\u4e71\u306b\u5f93\u3046\u3002<\/p>\n\n\n\n

\u30d1\u30e9\u30e1\u30fc\u30bf<\/h3>\n\n\n\n
\u8a18\u53f7<\/td>\u30d1\u30e9\u30e1\u30fc\u30bf\u8aac\u660e [\u5358\u4f4d]<\/td><\/tr>
\\( d \\)<\/td>2\u5c40\u9593\u306e\u5927\u5186\u8ddd\u96e2 [km]<\/td><\/tr>
\\( f \\)<\/td>\u5468\u6ce2\u6570 [GHz]<\/td><\/tr>
\\( G_{\\it max \\rm -1,2} \\)<\/td>\u5c401,2\u306e\u6700\u5927\u30a2\u30f3\u30c6\u30ca\u5229\u5f97\uff08\u8a08\u7b97\u4e0a\u306f\u89d2\u5ea6\u306b\u5fdc\u3058\u305f\u30a2\u30f3\u30c6\u30ca\u5229\u5f97\\( G_{1,2} \\)\u3092\u4f7f\u7528\u3059\u308b\uff09<\/td><\/tr>
\\( h_{1,2 \\it \\_loc} \\)<\/td>\u5c401,2\u306e\u6d77\u629c [km]<\/td><\/tr>
\\( h_R(p_h) \\)<\/td>\u6642\u9593\u7387\\( p_h \\)\u3092\u8d85\u3048\u306a\u3044\u964d\u96e8\u9ad8 [km] \u203b1<\/td><\/tr>
\\( M \\)<\/td>\u5c40\u9593\u306e\u504f\u6ce2\u4e0d\u6574\u5408\u306b\u3088\u308b\u640d\u5931 [dB]<\/td><\/tr>
\\( p \\)<\/td>\u5730\u8868\u306e\u6c17\u5727 [hPa]\uff08\u901a\u5e38 1013.25 hPa\uff09 \u203b2<\/td><\/tr>
\\( R(p_R) \\)<\/td>\u6642\u9593\u7387\\( p_R \\)\u3092\u8d85\u3048\u306a\u3044\u964d\u96e8\u5f37\u5ea6 [mm\/h] \u203b1<\/td><\/tr>
\\( T \\)<\/td>\u5730\u8868\u306e\u6c17\u6e29 [\u2103] \uff08\u901a\u5e38 15 \u2103\uff09\u203b2<\/td><\/tr>
\\( \\alpha_{1,2 \\it \\_loc} \\)<\/td>\u5c401\u306e\u30e1\u30a4\u30f3\u30d3\u30fc\u30e0\u65b9\u5411\u304b\u3089\u5c402\u3078\u306e\u65b9\u4f4d\u89d2 [rad]
\u5c402\u306e\u30e1\u30a4\u30f3\u30d3\u30fc\u30e0\u65b9\u5411\u304b\u3089\u5c401\u3078\u306e\u65b9\u4f4d\u89d2 [rad]
\uff08\u6642\u8a08\u56de\u308a\u304c\u6b63\uff09<\/td><\/tr>
\\( \\varepsilon_{1,2 \\it \\_loc} \\)<\/td>\u5c401,2\u306e\u4ef0\u89d2 [rad]<\/td><\/tr>
\\( \\rho \\)<\/td>\u5730\u8868\u306e\u6c34\u84b8\u6c17\u5bc6\u5ea6 [g\/m3<\/sup>]\uff08\u901a\u5e38 8 g\/m3<\/sup>\uff09\u203b2<\/td><\/tr>
\\( \\tau \\)<\/td>\u30ea\u30f3\u30af\u306e\u504f\u6ce2\u89d2 [\u00b0]\uff080\u00b0 : \u6c34\u5e73\u504f\u6ce2 , 90\u00b0 : \u5782\u76f4\u504f\u6ce2 , 45\u00b0 : \u5186\u504f\u6ce2\uff09\u203b3<\/td><\/tr>
\\( r_{\\it eff} \\)<\/td>\u6709\u52b9\u5730\u7403\u534a\u5f84 [km]\uff08\u901a\u5e38 8473.43 km\uff09\u203b3<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

\u203b1 \u964d\u96e8\u9ad8\\( h_R(p_h) \\)\u306fITU-R\u52e7\u544aP.839\u3001\u964d\u96e8\u5f37\u5ea6\\( R(p_R) \\)\u306fITU-R\u52e7\u544aP.837\u3092\u53c2\u7167\u3002\u3053\u3053\u3067\u3001\u6642\u9593\u7387\\( p_h \\)\u304a\u3088\u3073\\( p_R \\)\u306f\u4e92\u3044\u306b\u72ec\u7acb\u3068\u4eee\u5b9a\u3057\u3066\u3044\u308b\u3002
\u203b2 \u964d\u96e8\u5f37\u5ea6\\( R(p_R) \\)\u3084\u5927\u6c17\u30ac\u30b9\u5438\u53ce\u306b\u3088\u308b\u6e1b\u8870\\( A_g \\)\u3092\u8a08\u7b97\u3059\u308b\u5834\u5408\u306b\u4f7f\u7528\u3059\u308b\u3002
\u203b3 ITU-R\u52e7\u544aP.452\u306e\u8a08\u7b97\u306b\u4f7f\u7528\u3059\u308b\u3002\uff08\u4ee5\u4e0b\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u3067\u3082\u7528\u3044\u3089\u308c\u3066\u3044\u308b\u3002\uff09<\/p>\n\n\n\n

\u30d7\u30ed\u30b0\u30e9\u30e0<\/h3>\n\n\n\n

\u4ee5\u4e0b\u306b\u6563\u4e71\u4f1d\u9054\u95a2\u6570\\( C_{a,b} \\)\u304a\u3088\u3073\u6563\u4e71\u89d2\\( \\varphi_S \\)\u3092\u8a08\u7b97\u3059\u308bMATLAB\u30b3\u30fc\u30c9\u3092\u63d0\u4f9b\u3059\u308b\u3002\u4ee5\u4e0b\u306e\u30b3\u30fc\u30c9\u3067\u306f\u4e21\u5c40\u3092\u7b49\u65b9\u6027\u30a2\u30f3\u30c6\u30ca\u3068\u3057\u3001\u5165\u529b\u30d1\u30e9\u30e1\u30fc\u30bf\u306e\u964d\u96e8\u9ad8\\( h_R \\)\u304a\u3088\u3073\u964d\u96e8\u5f37\u5ea6\\( R \\)\u306b\u3064\u3044\u3066\u306f\u5b9a\u6570\u3067\u8a2d\u5b9a\u3057\u3066\u3044\u308b\u3002\u307e\u305f\u3001\u8a08\u7b97\u306e\u90fd\u5408\u4e0a\u3001\u7a4d\u5206\u533a\u9593\u306e\u4e0b\u9650\u306e\u9ad8\u3055\\( h_{min} \\)\u3092\u5c40\u304b\u3089\u964d\u96e8\u30bb\u30eb\u4e2d\u5fc3\u307e\u3067\u306e\u8ddd\u96e2\u3067\u8fd1\u4f3c\u3057\u3066\u304a\u308a\u3001\u5c40\u3068\u964d\u96e8\u30bb\u30eb\u3068\u306e\u9593\u306b\u306f\u969c\u5bb3\u7269\u306f\u306a\u3044\u3082\u306e\u3068\u4eee\u5b9a\u3057\u3066\u3044\u308b\u3002<\/p>\n\n\n\n

RainScatter<\/a>\uff08\u30c6\u30ad\u30b9\u30c8\u30d5\u30a1\u30a4\u30eb\uff09<\/p>\n\n\n\n

\u53c2\u7167<\/h2>\n\n\n\n[1] \u7d30\u77e2\u826f\u96c4\u4f01\u753b\u30fb\u76e3\u4fee, \u201c\u96fb\u6ce2\u4f1d\u642c\u30cf\u30f3\u30c9\u30d6\u30c3\u30af\u201d, \u30ea\u30a2\u30e9\u30a4\u30ba\u793e, 1999.<\/p>\n\n\n\n[2] Rec. ITU-R P.452-17, \u201cPrediction procedure for the evaluation of interference between stations on the surface of the Earth at frequencies above about 0.1 GHz,\u201d Sep. 2021.<\/p>\n\n\n\n[3] Rec. ITU-R P.619-5, \u201dPropagation data required for the evaluation of interference between stations in space and those on the surface of the Earth,\u201d Sep. 2021.<\/p>\n\n\n\n[4] \u963f\u6ce2\u52a0 \u7d14, \u201c\u964d\u96e8\u6563\u4e71\u306b\u3088\u308b\u5e72\u6e09\u306e\u4e88\u6e2c\uff08BS\u306b\u3064\u3044\u3066\uff09\u201d, \u60c5\u5831\u901a\u4fe1\u7814\u7a76\u6a5f\u69cb\u30b8\u30e3\u30fc\u30ca\u30eb Vol.24, No.127, pp.159-172, 1978.<\/p>\n\n\n\n[5] Rec. ITU-R P.837-7, \u201dCharacteristics of precipitation for propagation modelling,\u201d June 2017.<\/p>\n\n\n\n[6] Rec. ITU-R P.838-3, \u201dSpecific attenuation model for rain for use in prediction methods,\u201d Mar. 2005.<\/p>\n\n\n\n[7] Rec. ITU-R P.839-4, \u201dRain height model for prediction methods,\u201d Sep. 2013.<\/p>\n\n\n\n[8] Rec. ITU-R P.2040-2, \u201dEffects of building materials and structures on radiowave propagation above about 100 MHz,\u201d Sep. 2021.<\/p>\n","protected":false},"excerpt":{"rendered":"

\u30e2\u30c7\u30eb\u306e\u6982\u8981 \u3000\u96fb\u6ce2\u306f\u96e8\u6ef4\u306b\u5f53\u305f\u308b\u3068\u5438\u53ce\u30fb\u6563\u4e71\u304c\u8d77\u3053\u308b\u3002\u96e8\u6ef4\u306f\u640d\u5931\u3092\u3082\u3064\u8a98\u96fb\u4f53\u3067\u3042\u308a\u3001\u96e8\u6ef4\u534a\u5f84\u306f\u9727\u306e\u69d8\u306b\u975e\u5e38\u306b\u5c0f\u3055\u306a\u3082\u306e\u304b\u3089\u6700\u59273.5 mm\u7a0b\u5ea6\u307e\u3067\u5206\u5e03\u3057\u3066\u3044\u308b\u306e\u3067\u3001\u6ce2\u9577\u304c\u77ed\u3044\u30de\u30a4\u30af\u30ed\u6ce2\u5e2f\u30fb\u30df\u30ea\u6ce2\u5e2f\u3067\u306f\u964d\u96e8\u306b\u3088\u308b\u6e1b\u8870\u304c\u554f […]<\/p>\n","protected":false},"author":5,"featured_media":0,"parent":12073,"menu_order":45,"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-8360","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.ieice.org\/cs\/ap\/wp-json\/wp\/v2\/pages\/8360","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=8360"}],"version-history":[{"count":93,"href":"https:\/\/www.ieice.org\/cs\/ap\/wp-json\/wp\/v2\/pages\/8360\/revisions"}],"predecessor-version":[{"id":14882,"href":"https:\/\/www.ieice.org\/cs\/ap\/wp-json\/wp\/v2\/pages\/8360\/revisions\/14882"}],"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=8360"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}