{"id":8349,"date":"2023-04-26T17:18:07","date_gmt":"2023-04-26T08:18:07","guid":{"rendered":"https:\/\/www11.ieice.org\/cs\/ap\/wp\/?page_id=8349"},"modified":"2025-12-05T19:14:29","modified_gmt":"2025-12-05T10:14:29","slug":"tropospheric_scintillation","status":"publish","type":"page","link":"https:\/\/www.ieice.org\/cs\/ap\/misc\/denpan-db\/prop_model_db\/model_list\/tropospheric_scintillation\/","title":{"rendered":"\u5bfe\u6d41\u570f\u30b7\u30f3\u30c1\u30ec\u30fc\u30b7\u30e7\u30f3"},"content":{"rendered":"
<\/div>

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

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

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

\u3000\u30b7\u30f3\u30c1\u30ec\u30fc\u30b7\u30e7\u30f3\u3068\u306f\u5143\u3005\u306f\u661f\u306e\u660e\u308b\u3055\u304c\u201c\u307e\u305f\u305f\u304f\u201d\u3053\u3068\u3092\u6307\u3059\u3002\u5730\u7403\u5927\u6c17\u306e\u6e29\u5ea6\u3084\u6e7f\u5ea6\u304c\u5834\u6240\u7684\u306b\u4e0d\u5747\u4e00\u3067\u3042\u308b\u305f\u3081\u306b\u5149\u306e\u5c48\u6298\u7387\u304c\u5834\u6240\u7684\u306b\u7570\u306a\u308a\u5149\u306e\u5e72\u6e09\u304c\u751f\u3058\u308b\u3002\u6b21\u306b\u6e29\u5ea6\u3084\u6e7f\u5ea6\u304c\u6642\u9593\u7684\u306b\u5909\u308f\u308b\u3053\u3068\u3067\u5149\u306e\u5e72\u6e09\u91cf\u304c\u5909\u308f\u308a\u5149\u306e\u660e\u308b\u3055\u304c\u5909\u308f\u308b\u3002\u5149\u306e\u6ce2\u9762\u306b\u7740\u76ee\u3059\u308b\u3068\u3001\u3053\u306e\u6ce2\u9762\u304c\u6b6a\u3080\u3053\u3068\u306b\u3088\u308a\u5149\u306e\u660e\u308b\u3055\u304c\u5909\u308f\u308b\u306e\u3067\u5149\u306e\u53ce\u675f\u3084\u767a\u6563\u304c\u539f\u56e0\u3067\u3042\u308b\u3068\u3082\u8868\u73fe\u3055\u308c\u308b\u3002
\u3000\u3053\u3053\u3067\u306e\u5bfe\u6d41\u570f\u30b7\u30f3\u30c1\u30ec\u30fc\u30b7\u30e7\u30f3\u3068\u306f\u3001\u5149\u3067\u306f\u306a\u304f\u96fb\u6ce2\u304c\u5bfe\u6d41\u570f\u3092\u4f1d\u642c\u3059\u308b\u3068\u304d\u306b\u540c\u69d8\u306e\u539f\u56e0\u306b\u3088\u3063\u3066\u53d7\u4fe1\u30ec\u30d9\u30eb\u304c\u5909\u5316\u3059\u308b\u3053\u3068\u3092\u3044\u3046\u3002\u5bfe\u6d41\u570f\u30b7\u30f3\u30c1\u30ec\u30fc\u30b7\u30e7\u30f3\u306b\u306f\u6b21\u306e\u3088\u3046\u306a\u7279\u5fb4\u304c\u3042\u308b\u3002
\u30fb\u5730\u7403\u5c40\u304b\u3089\u885b\u661f\u7b49\u306e\u9001\u4fe1\u5c40\u3092\u898b\u305f\u3068\u304d\u306e\u4ef0\u89d2\u304c10\u00b0\u3088\u308a\u5c0f\u3055\u3044\u3068\u53d7\u4fe1\u30ec\u30d9\u30eb\u306e\u4f4e\u4e0b\u304c\u554f\u984c\u306b\u306a\u308b\u300210\u00b0\u4ee5\u4e0a\u3042\u308c\u3070\u5b9f\u7528\u4e0a\u3067\u554f\u984c\u306b\u306a\u3089\u306a\u3044\u3002
\u30fb\u5468\u6ce2\u6570\u304c\u9ad8\u304f\u306a\u308b\u307b\u3069\u3001\u8ddd\u96e2\u304c\u9577\u304f\u306a\u308b\u307b\u3069\u5bfe\u6d41\u570f\u30b7\u30f3\u30c1\u30ec\u30fc\u30b7\u30e7\u30f3\u306e\u5f71\u97ff\u306f\u5927\u304d\u304f\u306a\u308b\u3002
\u30fb\u30a2\u30f3\u30c6\u30ca\u306e\u958b\u53e3\u9762\u7a4d\u304c\u5927\u304d\u304f\u306a\u308b\u307b\u3069\uff08\u30a2\u30f3\u30c6\u30ca\u30d3\u30fc\u30e0\u5e45\u304c\u72ed\u304f\u306a\u308b\u307b\u3069\uff09\u3001\u958b\u53e3\u3067\u306e\u5e73\u5747\u5316\u306b\u3088\u308a\u5bfe\u6d41\u570f\u30b7\u30f3\u30c1\u30ec\u30fc\u30b7\u30e7\u30f3\u306e\u5f71\u97ff\u306f\u5c0f\u3055\u304f\u306a\u308b\u3002
\u30fb\u885b\u661f\u5c40\u3068\u5730\u7403\u5c40\u9593\u306e\u885b\u661f\u901a\u4fe1\u306b\u304a\u3044\u3066\u3001\u4ef0\u89d2\u304c\u6570\u5ea6\u4ee5\u4e0b\u3067\u56fa\u5b9a\u3055\u308c\u308b\u9759\u6b62\u885b\u661f\u3067\u306f\u7121\u7dda\u56de\u7dda\u8a2d\u8a08\u3067\u8003\u616e\u304c\u5fc5\u8981\u306b\u306a\u308b\u3002\u4e0a\u7a7a\u3092\u79fb\u52d5\u3059\u308b\u5c40\uff08\u822a\u7a7a\u6a5f\u3084HAPS\u3001\u5468\u56de\u885b\u661f\u306a\u3069\uff09\u3067\u306f\u4ef0\u89d2\u304c\u5c0f\u3055\u304f\u306a\u308b\u5272\u5408\u304c\u5c11\u306a\u3044\u305f\u3081\u3001\u5bfe\u6d41\u570f\u30b7\u30f3\u30c1\u30ec\u30fc\u30b7\u30e7\u30f3\u306e\u5f71\u97ff\u306f\u5c0f\u3055\u3044\u3002
\u3000\u306a\u304a\u3001\u5bfe\u6d41\u570f\u6563\u4e71\u306f\u5bfe\u6d41\u570f\u30b7\u30f3\u30c1\u30ec\u30fc\u30b7\u30e7\u30f3\u3068\u540c\u69d8\u306b\u5927\u6c17\u306e\u4e0d\u5747\u4e00\u306b\u3088\u3063\u3066\u5e0c\u671b\u6ce2\u306e\u53d7\u4fe1\u30ec\u30d9\u30eb\u304c\u5909\u5316\u3059\u308b\u73fe\u8c61\u3067\u3042\u308b\u3002\u5bfe\u6d41\u570f\u30b7\u30f3\u30c1\u30ec\u30fc\u30b7\u30e7\u30f3\u304c\u9001\u53d7\u4fe1\u9593\u306b\u898b\u901a\u3057\u304c\u3042\u308b\u3068\u304d\u306e\u76f4\u63a5\u6ce2\u306e\u53d7\u4fe1\u30ec\u30d9\u30eb\u3092\u5bfe\u8c61\u306b\u3057\u3066\u3044\u308b\u306e\u306b\u5bfe\u3057\u3066\u3001\u5bfe\u6d41\u570f\u6563\u4e71\u306f\u9001\u53d7\u4fe1\u9593\u306b\u898b\u901a\u3057\u304c\u306a\u3044\u3068\u304d\u306e\u6563\u4e71\u6ce2\u306e\u53d7\u4fe1\u30ec\u30d9\u30eb\u3092\u5bfe\u8c61\u306b\u3057\u3066\u3044\u308b\u3002\u885b\u661f\u901a\u4fe1\u3084\u56fa\u5b9a\u901a\u4fe1\u306e\u7121\u7dda\u56de\u7dda\u8a2d\u8a08\u3067\u306f\u3053\u308c\u3089\u306e\u4f1d\u642c\u7279\u6027\u3092\u8003\u616e\u3059\u308b\u3002\u3000<\/p>\n\n\n

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

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

\u3000\u4ef0\u89d2\uff15\u00b0\u4ee5\u4e0a\u3067\u306e\u5bfe\u6d41\u570f\u306e\u30b7\u30f3\u30c1\u30ec\u30fc\u30b7\u30e7\u30f3\u306e\u7d2f\u7a4d\u5206\u5e03\u3092\u63a8\u5b9a\u3059\u308b\u305f\u3081\u306e\u4e00\u822c\u7684\u306a\u65b9\u6cd5\u306f\u6b21\u306e\u3068\u304a\u308a\u3002\u3053\u306e\u65b9\u6cd5\u306f7 GHz\u306814 GHz\u306e\u5468\u6ce2\u6570\u3067\u691c\u8a0e\u3055\u308c\u3066\u304a\u308a\u3001\u5c11\u306a\u304f\u3068\u308220 GHz\u307e\u3067\u306e\u9069\u7528\u306b\u63a8\u85a6\u3055\u308c\u308b\u3002\u63a8\u5b9a\u306b\u7528\u3044\u308b\u30d1\u30e9\u30e1\u30fc\u30bf\u306e\u8aac\u660e\u306f(4)\u30d1\u30e9\u30e1\u30fc\u30bf\u306e\u30da\u30fc\u30b8\u3092\u53c2\u7167\u3002<\/p>\n\n\n\n

Step1 <\/em>: \u6c17\u6e29\\(t\\)\u304b\u3089\u6b21\u5f0f\u3067\u98fd\u548c\u6c34\u84b8\u6c17\u5727\\(e_s\\)\u3092\u8a08\u7b97\u3059\u308b\u3002<\/p>\n\n\n\n

\\(
e_s = 6.1121 \\cdot \\exp \\left[ \\frac{\\left(18.678 – \\frac{t}{234.5} \\right) \\cdot t}{t + 257.14} \\right] \\quad {\\rm [hPa]} \\\\
\\tag{1}
\\)<\/p>\n\n\n\n

Step2 <\/em>: \u96fb\u6ce2\u306e\u5927\u6c17\u5c48\u6298\u6307\u6570\u306e\u6c34\u84b8\u6c17\u9805\\(N_{wet}\\)\u3092\u6b21\u5f0f\u3067\u8a08\u7b97\u3059\u308b\u3002<\/p>\n\n\n\n

\\(
N_{\\it wet} = 72 \\frac{e}{t + 273} + 3.75 \\times 10^5 \\frac{e}{(e + 273)^2} \\\\
\\tag{2}
\\)
\\(
e = \\frac{H \\cdot e_s}{100} \\quad {\\rm [hPa]} \\\\
\\tag{3}
\\)<\/p>\n\n\n\n

Step3 <\/em>: \u4fe1\u53f7\u632f\u5e45\u306e\u6a19\u6e96\u504f\u5dee\\(\\sigma_{\\it ref}\\)(dB)\u3092\u6b21\u5f0f\u3067\u8a08\u7b97\u3059\u308b\u3002<\/p>\n\n\n\n

\\(
\\sigma_{\\it ref} = 3.6 \\times 10^{-3} + 10^{-4} \\times N_{\\it wet} \\quad {\\rm [dB]} \\\\
\\tag{4}
\\)<\/p>\n\n\n\n

Step4 <\/em>: \u5b9f\u52b9\u4f1d\u642c\u8def\u9577\\(L\\)(m)\u3092\u6b21\u5f0f\u3067\u8a08\u7b97\u3059\u308b\u3002<\/p>\n\n\n\n

\\(
L = \\frac{2 h_L}{\\sqrt{\\sin^2 \\theta + 2.35 \\times 10^{-4} + \\sin \\theta}} \\quad {\\rm [m]} \\\\
\\tag{5}
\\)<\/p>\n\n\n\n

\u3053\u3053\u3067\u3001\\(h_L\\)\u306f\u5927\u6c17\u4e71\u6d41\u5c64\u306e\u9ad8\u3055\u3067\u30011000 m\u304c\u7528\u3044\u3089\u308c\u308b\u3002<\/p>\n\n\n\n

Step5 <\/em>: \u5b9f\u30a2\u30f3\u30c6\u30ca\u306e\u5e7e\u4f55\u5b66\u7684\u306a\u958b\u53e3\u5f84\\(D\\)(m)\u304b\u3089\u30a2\u30f3\u30c6\u30ca\u52b9\u7387\u3092\u8003\u616e\u3057\u3066\u30a2\u30f3\u30c6\u30ca\u306e\u5b9f\u52b9\u958b\u53e3\u76f4\u5f84\\(D_{\\it eff}\\)\u3092\u6b21\u5f0f\u3067\u8a08\u7b97\u3059\u308b\u3002<\/p>\n\n\n\n

\\(
D_{\\it eff} = \\sqrt{\\eta} D \\quad {\\rm [m]} \\\\
\\tag{6}
\\)<\/p>\n\n\n\n

Step6 <\/em>: \u30a2\u30f3\u30c6\u30ca\u5e73\u5747\u5316\u4fc2\u6570\u3092\u6b21\u5f0f\u3067\u8a08\u7b97\u3059\u308b\u3002<\/p>\n\n\n\n

\\(
g(x) = \\sqrt{3.86 (x^2 + 1)^{11\/12} \\cdot \\sin \\left[ \\frac{11}{6} \\tan^{-1} \\frac{1}{x} \\right] – 7.08 x^{5\/6}} \\\\
\\tag{7}
\\)
\\(
x = 1.22 {D_{\\it eff}}^2 (f \/ L) \\\\
\\tag{8}
\\)<\/p>\n\n\n\n

Step7 <\/em>: \u5bfe\u8c61\u3068\u3059\u308b\u671f\u9593\u3001\u4f1d\u642c\u8def\u9577\u306b\u5bfe\u3059\u308b\u4fe1\u53f7\u632f\u5e45\u306e\u6a19\u6e96\u504f\u5dee\u3092\u6b21\u5f0f\u3067\u8a08\u7b97\u3059\u308b\u3002<\/p>\n\n\n\n

\\(
\\sigma = \\sigma_{\\it ref} f^{7\/12} \\frac{g(x)}{(\\sin \\theta)^{1.2}} \\\\
\\tag{9}
\\)<\/p>\n\n\n\n

Step8 <\/em>: \u7d2f\u7a4d\u6642\u9593\u7387\\(p\\)(0.01% \u2266 \\(p\\) \u226650%)\u306b\u4f9d\u5b58\u3059\u308b\u4fc2\u6570\\(a(p)\\)\u3092\u6b21\u5f0f\u3067\u8a08\u7b97\u3059\u308b\u3002<\/p>\n\n\n\n

\\(
a(p) = -0.061(\\log_{10} p)^3 + 0.072(\\log_{10} p)^2 – 1.71 \\log_{10} p + 3.0 \\\\
\\tag{10}
\\)<\/p>\n\n\n\n

Step9 <\/em>: \u7d2f\u7a4d\u6642\u9593\u7387\\(p\\)\u306b\u5bfe\u5fdc\u3057\u305f\u30b7\u30f3\u30c1\u30ec\u30fc\u30b7\u30e7\u30f3\u306b\u3088\u308b\u6e1b\u8870(dB)\u3092\u6b21\u5f0f\u3067\u8a08\u7b97\u3059\u308b\u3002<\/p>\n\n\n\n

\\(
A(p) = a(p) \\cdot \\sigma \\\\
\\tag{11}
\\)<\/p>\n\n\n\n

\\(p\\)=50%\u3067\\(a(p)\\)=0\u3067\u3042\u308b\u305f\u3081\u3001\\(A(p)\\)\u306f50%\u5024\u3067\u306e\u6e1b\u8870\u30920 dB\u3068\u3057\u305f\u76f8\u5bfe\u5024\u3092\u8868\u3057\u3066\u3044\u308b\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]\u3000<\/td>\u9069\u7528\u7bc4\u56f2<\/td><\/tr>
\\(t\\)<\/td>\u5730\u7403\u5c40\u306b\u304a\u3051\u308b1\u30ab\u6708\u3042\u308b\u3044\u306f\u305d\u308c\u4ee5\u4e0a
\u306e\u671f\u9593\u306b\u304a\u3051\u308b\u6c17\u6e29\u306e\u5e73\u5747\u5024(\u2103)<\/td>		\uff7040\uff5e50\u2103<\/td><\/tr>
\\(H\\)<\/td>\u5730\u7403\u5c40\u306b\u304a\u3051\u308b1\u30ab\u6708\u3042\u308b\u3044\u306f\u305d\u308c\u4ee5\u4e0a
\u306e\u671f\u9593\u306b\u304a\u3051\u308b\u76f8\u5bfe\u6e7f\u5ea6\u306e\u5e73\u5747\u5024(\uff05)<\/td>		0\uff5e100%<\/td><\/tr>
\\(f\\)<\/td>\u5468\u6ce2\u6570(GHz) <\/td>4 GHz\u2266 \\(f\\) \u226620 GHz<\/td><\/tr>
\\(\u03b8\\)<\/td>\u5730\u7403\u5c40\u304b\u3089\u885b\u661f\u5c40\u3092\u898b\u305f\u3068\u304d\u306e\u4ef0\u89d2(\u00b0) <\/td> \\(\u03b8\\) \u22675\u00b0<\/td><\/tr>
\\(D\\)<\/td>\u5730\u7403\u5c40\u30a2\u30f3\u30c6\u30ca\u306e\u958b\u53e3\u5f84(m) <\/td>\u8a18\u8f09\u306a\u3057<\/td><\/tr>
\\(\u03b7\\)<\/td>\u30a2\u30f3\u30c6\u30ca\u52b9\u7387
\uff08\u4e0d\u660e\u306e\u3068\u304d\u306f\u4ee3\u8868\u5024\u3068\u3057\u3066\\(\u03b7\\)=0.5\u306a\u3069\u3092\u7528\u3044\u308b\uff09<\/td>		\\(\u03b7\\) \u22661.0<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

\u30b7\u30f3\u30c1\u30ec\u30fc\u30b7\u30e7\u30f3\u306e\u640d\u5931\u306b\u5bfe\u3059\u308b\u5404\u30d1\u30e9\u30e1\u30fc\u30bf\u306e\u5f71\u97ff\u306f\u6b21\u306e\u3068\u304a\u308a\u3002
\u6c17\u6e29\u304c\u9ad8\u3044\u307b\u3069\u3001\u76f8\u5bfe\u6e7f\u5ea6\u304c\u9ad8\u3044\u307b\u3069\u3001\u5468\u6ce2\u6570\u304c\u9ad8\u3044\u307b\u3069\u3001\u4ef0\u89d2\u304c\u5c0f\u3055\u3044\u307b\u3069\u3001\u30a2\u30f3\u30c6\u30ca\u958b\u53e3\u5f84\u304c\u5927\u304d\u3044\u307b\u3069\u3001\u30b7\u30f3\u30c1\u30ec\u30fc\u30b7\u30e7\u30f3\u306e\u640d\u5931\u306f\u5897\u52a0\u3059\u308b\u3002<\/p>\n\n\n\n

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

\u8a08\u7b97\u306e\u78ba\u8a8d\u306e\u305f\u3081\u306b\u3001\u7279\u5b9a\u306e\u30d1\u30e9\u30e1\u30fc\u30bf\u5024\u3092\u7528\u3044\u305f\u3068\u304d\u306e\u8a08\u7b97\u7d50\u679c\u3092\u793a\u3059\u3002<\/p>\n\n\n\n

\uff1c\u30d1\u30e9\u30e1\u30fc\u30bf\u5024\uff1e<\/p>\n\n\n\n

\\(t\\)=20\u2103\u3001\\(H\\)=50%\u3001\\(f\\)=10 GHz\u3001\\(\u03b8\\)=5\u00b0\u3001\\(D\\)=10 m\u3001\\(\u03b7\\)=0.5<\/p>\n\n\n\n

\uff1c\u8a08\u7b97\u7d50\u679c\uff1e<\/p>\n\n\n\n

\\(e_s\\)=23.4\u3001\\(e\\)=11.7\u3001\\(N_{wet}\\)=53.9\u3001\\(\u03c3_{\\it ref}\\)=0.009\u3001\\(L\\)=1.14\u00d7104<\/sup>\u3001\\(D_{\\it eff}\\)=7.07<\/p>\n\n\n\n

\\(x\\)=0.054\u3001\\(g(\\)0.054\\()\\)=0.86\u3001\\(\u03c3\\)=0.56<\/p>\n\n\n\n

\\(p\\)=0.01, 0.1, 1, 10, 50\u306e\u3068\u304d\u3001\\(a(p)\\)=7.2, 4.8, 3.0, 1.3, 0.0\u3001\\(A(\\)0.01\\()\\)=4.0<\/p>\n\n\n\n

\u5bfe\u6d41\u570f\u30b7\u30f3\u30c1\u30ec\u30fc\u30b7\u30e7\u30f3\u306e\u640d\u5931\u306e\u8a08\u7b97\u4f8b\u3092\u793a\u3059\u3002 \u30b7\u30f3\u30c1\u30ec\u30fc\u30b7\u30e7\u30f3\u306b\u3088\u3063\u3066\u751f\u3058\u308b\u30d5\u30a7\u30fc\u30b8\u30f3\u30b0\u306e\u7d2f\u7a4d50%\u5024\u30920dB\u3068\u3057\u3066\u3044\u308b\u3002<\/p>\n\n\n\n

\n
\n
\"\"
\u5730\u7403\u5c40\u304b\u3089\u307f\u305f\u4ef0\u89d2\u306b\u5bfe\u3059\u308b
\u5bfe\u6d41\u570f\u30b7\u30f3\u30c1\u30ec\u30fc\u30b7\u30e7\u30f3\u306e\u640d\u5931<\/span><\/figcaption><\/figure><\/div><\/div>\n\n\n\n
\n
\"\"
\u5bfe\u6d41\u570f\u30b7\u30f3\u30c1\u30ec\u30fc\u30b7\u30e7\u30f3\u306e\u640d\u5931\u306e\u7d2f\u7a4d\u78ba\u7387\u5206\u5e03<\/span><\/figcaption><\/figure><\/div><\/div>\n<\/div>\n\n\n\n

\u30d7\u30ed\u30b0\u30e9\u30e0\u4f8b<\/h3>\n\n\n\n

\u5f0f(1)\uff5e(10)\u3092\u30a8\u30af\u30bb\u30eb\u3067\u8a08\u7b97\u3059\u308b\u5834\u5408\u306e\u6570\u5f0f\u306f\u6b21\u306e\u3068\u304a\u308a\u3067\u3001\u300c=\u300d\u4ee5\u964d\u306e\u6570\u5f0f\u3092\u30a8\u30af\u30bb\u30eb\u306e\u30bb\u30eb\u306b\u5165\u529b\u3057\u3066\u3001\u5909\u6570\u3092\u6570\u5024\u3084\u8a72\u5f53\u306e\u30bb\u30eb\u306b\u76f4\u3059\u3068\u8a08\u7b97\u7d50\u679c\u304c\u5f97\u3089\u308c\u308b\u3002<\/p>\n\n\n\n

\u307e\u305f\u3001\u6b21\u306e\u6570\u5f0f\u3092\u30b3\u30d4\u30fc&\u30da\u30fc\u30b9\u30c8\u3057\u3066\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u8a00\u8a9e\u306b\u66f8\u304d\u63db\u3048\u308b\u3053\u3068\u3082\u53ef\u80fd\u3067\u3042\u308b\u3002<\/p>\n\n\n\n

(1)es=6.1121*EXP(((18.678-t\/234.5)*t)\/(t+257.14))<\/p>\n\n\n\n

(2)Nwet=72*e\/(t+273)+3.75*10^5*e\/(t+273)^2 <\/p>\n\n\n\n

(3)e=H*es\/100<\/p>\n\n\n\n

(4) <\/em>\u03c3ref=3.6*10^-3+10^-4*Nwet<\/p>\n\n\n\n

(5) a=SQRT(SIN(\u03b8)^2+2.35*10^-4)<\/p>\n\n\n\n

      L=2000\/(a+SIN(\u03b8)) <\/p>\n\n\n\n

(6) Deff=SQRT(\u03b7)*D<\/p>\n\n\n\n

(7) x=1.22*Deff^2*(f\/L)<\/p>\n\n\n\n

     g=SQRT(3.86*(x^2+1)^(11\/12)*SIN(11\/6*ATAN(1\/x))-7.08*x^(5\/6))<\/p>\n\n\n\n

(8) \u03c3= \u03c3ref*f^(7\/12)*g\/SIN(\u03b8)^1.2<\/p>\n\n\n\n

(9) a=log(p)<\/p>\n\n\n\n

     a(p)=-0.061*a^3+0.072*a^2-1.71*a+3.0<\/p>\n\n\n\n

(10) A(p)=a(p)* \u03c3<\/p>\n\n\n\n

\u53c2\u7167<\/h2>\n\n\n\n[1] Rec. ITU-R P.618-13, “Propagation data and prediction methods required for the design of Earth-space telecommunication systems”, ITU-R, 2017.<\/p>\n\n\n\n[2] Rec. ITU-R P.453-14, “The radio refractive index: its formula and refractivity data”, ITU-R, 2019.<\/p>\n\n\n\n[3] \u5c71\u7530\u677e\u4e00\uff0c\u201c\u56fa\u5b9a\u885b\u661f\u901a\u4fe1\u56de\u7dda\u306e\u4f1d\u642c\uff0c\u201d\u7121\u7dda\u901a\u4fe1\u306e\u96fb\u6ce2\u4f1d\u642c\uff0c\u9032\u58eb\u660c\u660e\uff08\u7de8\u8457\uff09\uff0c\u7b2c9\u7ae0\uff0c\uff08\u793e\uff09\u96fb\u5b50\u60c5\u5831\u901a\u4fe1\u5b66\u4f1a\uff0c\u6771\u4eac\uff0c 1992.<\/p>\n\n\n\n[4] \u4e95\u539f\u4fca\u592b\uff0c\u201c\u56fa\u5b9a\u885b\u661f\u901a\u4fe1\u306e\u4f1d\u642c\uff0c\u201d\u96fb\u6ce2\u4f1d\u642c\u30cf\u30f3\u30c9\u30d6\u30c3\u30af\uff0c\u7d30\u77e2\u826f\u96c4\uff08\u76e3\u4fee\uff09\uff0c\u7b2c20\u7ae0\uff0c\uff08\u682a\uff09\u30ea\u30a2\u30e9\u30a4\u30ba\u793e\uff0c\u6771\u4eac\uff0c1999.<\/p>\n","protected":false},"excerpt":{"rendered":"

\u30e2\u30c7\u30eb\u306e\u6982\u8981 \u3000\u30b7\u30f3\u30c1\u30ec\u30fc\u30b7\u30e7\u30f3\u3068\u306f\u5143\u3005\u306f\u661f\u306e\u660e\u308b\u3055\u304c\u201c\u307e\u305f\u305f\u304f\u201d\u3053\u3068\u3092\u6307\u3059\u3002\u5730\u7403\u5927\u6c17\u306e\u6e29\u5ea6\u3084\u6e7f\u5ea6\u304c\u5834\u6240\u7684\u306b\u4e0d\u5747\u4e00\u3067\u3042\u308b\u305f\u3081\u306b\u5149\u306e\u5c48\u6298\u7387\u304c\u5834\u6240\u7684\u306b\u7570\u306a\u308a\u5149\u306e\u5e72\u6e09\u304c\u751f\u3058\u308b\u3002\u6b21\u306b\u6e29\u5ea6\u3084\u6e7f\u5ea6\u304c\u6642\u9593\u7684\u306b\u5909\u308f\u308b\u3053\u3068\u3067\u5149\u306e\u5e72\u6e09\u91cf\u304c\u5909 […]<\/p>\n","protected":false},"author":5,"featured_media":0,"parent":12073,"menu_order":43,"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-8349","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.ieice.org\/cs\/ap\/wp-json\/wp\/v2\/pages\/8349","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=8349"}],"version-history":[{"count":38,"href":"https:\/\/www.ieice.org\/cs\/ap\/wp-json\/wp\/v2\/pages\/8349\/revisions"}],"predecessor-version":[{"id":14886,"href":"https:\/\/www.ieice.org\/cs\/ap\/wp-json\/wp\/v2\/pages\/8349\/revisions\/14886"}],"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=8349"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}