{"id":209221,"date":"2024-03-21T14:06:41","date_gmt":"2024-03-21T14:06:41","guid":{"rendered":"https:\/\/www.electricity-magnetism.org\/%e3%83%ac%e3%83%bc%e3%83%80%e3%83%bc%e7%af%84%e5%9b%b2%e6%96%b9%e7%a8%8b%e5%bc%8f-%e6%a6%82%e8%a6%81%e3%81%a8%e8%a8%88%e7%ae%97%e6%96%b9%e6%b3%95\/"},"modified":"2024-05-17T15:09:02","modified_gmt":"2024-05-17T15:09:02","slug":"%e3%83%ac%e3%83%bc%e3%83%80%e3%83%bc%e7%af%84%e5%9b%b2%e6%96%b9%e7%a8%8b%e5%bc%8f-%e6%a6%82%e8%a6%81%e3%81%a8%e8%a8%88%e7%ae%97%e6%96%b9%e6%b3%95","status":"publish","type":"post","link":"https:\/\/www.electricity-magnetism.org\/ja\/%e3%83%ac%e3%83%bc%e3%83%80%e3%83%bc%e7%af%84%e5%9b%b2%e6%96%b9%e7%a8%8b%e5%bc%8f-%e6%a6%82%e8%a6%81%e3%81%a8%e8%a8%88%e7%ae%97%e6%96%b9%e6%b3%95\/","title":{"rendered":"\u30ec\u30fc\u30c0\u30fc\u7bc4\u56f2\u65b9\u7a0b\u5f0f | \u6982\u8981\u3068\u8a08\u7b97\u65b9\u6cd5"},"content":{"rendered":"<p class=\"sidekick\">\u30ec\u30fc\u30c0\u30fc\u7bc4\u56f2\u65b9\u7a0b\u5f0f\u306e\u6982\u8981\u3068\u8a08\u7b97\u65b9\u6cd5\u3092\u8aac\u660e\u3002\u9001\u4fe1\u96fb\u529b\u3001\u30a2\u30f3\u30c6\u30ca\u30b2\u30a4\u30f3\u3001\u6ce2\u9577\u3001\u30ec\u30fc\u30c0\u30fc\u30af\u30ed\u30b9\u30bb\u30af\u30b7\u30e7\u30f3\u306a\u3069\u306e\u5404\u30d1\u30e9\u30e1\u30fc\u30bf\u306e\u610f\u5473\u3068\u6e2c\u5b9a\u65b9\u6cd5\u306b\u3064\u3044\u3066\u8a73\u8ff0\u3002<\/p>\n<h2>\u30ec\u30fc\u30c0\u30fc\u7bc4\u56f2\u65b9\u7a0b\u5f0f | \u6982\u8981\u3068\u8a08\u7b97\u65b9\u6cd5<\/h2>\n<p>\u30ec\u30fc\u30c0\u30fc\u7bc4\u56f2\u65b9\u7a0b\u5f0f\u306f\u3001\u30ec\u30fc\u30c0\u30fc\u30b7\u30b9\u30c6\u30e0\u306e\u6027\u80fd\u3084\u6709\u52b9\u7bc4\u56f2\u3092\u8a08\u7b97\u3059\u308b\u305f\u3081\u306e\u91cd\u8981\u306a\u30c4\u30fc\u30eb\u3067\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u76ee\u6a19\u7269\u4f53\u307e\u3067\u306e\u8ddd\u96e2\u3084\u30ec\u30fc\u30c0\u30fc\u306e\u691c\u51fa\u80fd\u529b\u3092\u7406\u89e3\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001\u30ec\u30fc\u30c0\u30fc\u7bc4\u56f2\u65b9\u7a0b\u5f0f\u306e\u57fa\u672c\u6982\u5ff5\u3068\u8a08\u7b97\u65b9\u6cd5\u306b\u3064\u3044\u3066\u8aac\u660e\u3057\u307e\u3059\u3002<\/p>\n<h2>\u30ec\u30fc\u30c0\u30fc\u7bc4\u56f2\u65b9\u7a0b\u5f0f\u306e\u6982\u8981<\/h2>\n<p>\u30ec\u30fc\u30c0\u30fc\u7bc4\u56f2\u65b9\u7a0b\u5f0f\uff08Radar Range Equation\uff09\u306f\u3001\u9001\u4fe1\u3055\u308c\u305f\u30ec\u30fc\u30c0\u30fc\u4fe1\u53f7\u304c\u76ee\u6a19\u7269\u4f53\u306b\u53cd\u5c04\u3055\u308c\u3001\u518d\u3073\u30ec\u30fc\u30c0\u30fc\u53d7\u4fe1\u6a5f\u306b\u623b\u3063\u3066\u304f\u308b\u307e\u3067\u306b\u3069\u306e\u7a0b\u5ea6\u306e\u8ddd\u96e2\u304c\u6e2c\u5b9a\u3067\u304d\u308b\u304b\u3092\u8868\u3057\u307e\u3059\u3002\u3053\u306e\u65b9\u7a0b\u5f0f\u306f\u3001\u6b21\u306e\u3088\u3046\u306b\u8868\u3055\u308c\u307e\u3059\uff1a<\/p>\n<pre>\nR = \\left( \\frac{ P_t G^2 \\lambda^2 \\sigma }{ (4 \\pi)^3 P_r L } \\right)^{\\frac{1}{4}}\n<\/pre>\n<p>\u3053\u3053\u3067\u3001\u5404\u30d1\u30e9\u30e1\u30fc\u30bf\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u5b9a\u7fa9\u3055\u308c\u307e\u3059\uff1a<\/p>\n<ul>\n<li><b>R<\/b>\uff1a\u6709\u52b9\u7bc4\u56f2\uff08\u76ee\u6a19\u7269\u4f53\u307e\u3067\u306e\u8ddd\u96e2\uff09<\/li>\n<li><b>P_t<\/b>\uff1a\u9001\u4fe1\u96fb\u529b<\/li>\n<li><b>G<\/b>\uff1a\u30a2\u30f3\u30c6\u30ca\u30b2\u30a4\u30f3<\/li>\n<li><b>\\lambda<\/b>\uff1a\u6ce2\u9577<\/li>\n<li><b>\\sigma<\/b>\uff1a\u30ec\u30fc\u30c0\u30fc\u30af\u30ed\u30b9\u30bb\u30af\u30b7\u30e7\u30f3\uff08RCS\uff09<\/li>\n<li><b>P_r<\/b>\uff1a\u53d7\u4fe1\u6a5f\u611f\u5ea6<\/li>\n<li><b>L<\/b>\uff1a\u640d\u5931\u56e0\u5b50<\/li>\n<\/ul>\n<h2>\u5404\u30d1\u30e9\u30e1\u30fc\u30bf\u306e\u610f\u5473\u3068\u6e2c\u5b9a\u65b9\u6cd5<\/h2>\n<p>\u4e0a\u8a18\u306e\u5404\u30d1\u30e9\u30e1\u30fc\u30bf\u306b\u306f\u7279\u5225\u306a\u610f\u5473\u304c\u3042\u308a\u3001\u6b63\u78ba\u306a\u8a08\u7b97\u306e\u305f\u3081\u306b\u306f\u305d\u308c\u305e\u308c\u3092\u6b63\u3057\u304f\u6e2c\u5b9a\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<h3>\u9001\u4fe1\u96fb\u529b (P_t)<\/h3>\n<p>\u9001\u4fe1\u96fb\u529b\u306f\u30ec\u30fc\u30c0\u30fc\u88c5\u7f6e\u304b\u3089\u653e\u5c04\u3055\u308c\u308b\u96fb\u529b\u3067\u3059\u3002\u9001\u4fe1\u96fb\u529b\u304c\u5927\u304d\u3051\u308c\u3070\u5927\u304d\u3044\u307b\u3069\u3001\u9060\u304f\u307e\u3067\u96fb\u6ce2\u3092\u9001\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<h3>\u30a2\u30f3\u30c6\u30ca\u30b2\u30a4\u30f3 (G)<\/h3>\n<p>\u30a2\u30f3\u30c6\u30ca\u30b2\u30a4\u30f3\u306f\u30a2\u30f3\u30c6\u30ca\u306e\u52b9\u7387\u3092\u793a\u3059\u5024\u3067\u3001\u9ad8\u3044\u30b2\u30a4\u30f3\u306f\u4fe1\u53f7\u3092\u96c6\u4e2d\u3055\u305b\u9060\u304f\u307e\u3067\u5230\u9054\u3055\u305b\u308b\u80fd\u529b\u3092\u793a\u3057\u307e\u3059\u3002<\/p>\n<h3>\u6ce2\u9577 (\\lambda)<\/h3>\n<p>\u6ce2\u9577\u306f\u96fb\u78c1\u6ce2\u306e\u5468\u6ce2\u6570\u306b\u53cd\u6bd4\u4f8b\u3057\u3001\u6ce2\u9577\u304c\u77ed\u3044\u307b\u3069\u9ad8\u5468\u6ce2\u306b\u306a\u308a\u307e\u3059\u3002\u6ce2\u9577\u306f\u7a7a\u9593\u7684\u306a\u5206\u89e3\u80fd\u3084\u62e1\u6563\u7279\u6027\u306b\u5f71\u97ff\u3057\u307e\u3059\u3002<\/p>\n<h3>\u30ec\u30fc\u30c0\u30fc\u30af\u30ed\u30b9\u30bb\u30af\u30b7\u30e7\u30f3 (\u03c3)<\/h3>\n<p>\u30ec\u30fc\u30c0\u30fc\u30af\u30ed\u30b9\u30bb\u30af\u30b7\u30e7\u30f3\u306f\u76ee\u6a19\u7269\u4f53\u304c\u30ec\u30fc\u30c0\u30fc\u4fe1\u53f7\u3092\u3069\u306e\u7a0b\u5ea6\u53cd\u5c04\u3059\u308b\u304b\u3092\u793a\u3059\u6307\u6a19\u3067\u3001\u5bfe\u8c61\u7269\u306e\u5927\u304d\u3055\u3084\u5f62\u72b6\u306b\u4f9d\u5b58\u3057\u307e\u3059\u3002<\/p>\n<h3>\u53d7\u4fe1\u6a5f\u611f\u5ea6 (P_r)<\/h3>\n<p>\u53d7\u4fe1\u6a5f\u611f\u5ea6\u306f\u5fae\u5f31\u306a\u4fe1\u53f7\u3092\u3069\u306e\u7a0b\u5ea6\u53d7\u4fe1\u3067\u304d\u308b\u304b\u3092\u793a\u3059\u5024\u3067\u3059\u3002\u9ad8\u3044\u611f\u5ea6\u3092\u6301\u3064\u53d7\u4fe1\u6a5f\u306f\u4f4e\u4fe1\u53f7\u30ec\u30d9\u30eb\u3067\u3082\u691c\u51fa\u304c\u53ef\u80fd\u3067\u3059\u3002<\/p>\n<h3>\u640d\u5931\u56e0\u5b50 (L)<\/h3>\n<p>\u640d\u5931\u56e0\u5b50\u306f\u4f1d\u9001\u8def\u3084\u305d\u306e\u4ed6\u306e\u8981\u56e0\u306b\u3088\u308b\u4fe1\u53f7\u640d\u5931\u3092\u8868\u3057\u307e\u3059\u3002\u3053\u308c\u306b\u306f\u30a2\u30f3\u30c6\u30ca\u306e\u640d\u5931\u3001\u30b1\u30fc\u30d6\u30eb\u306e\u640d\u5931\u3001\u5927\u6c17\u4e2d\u306e\u5438\u53ce\u306a\u3069\u304c\u542b\u307e\u308c\u307e\u3059\u3002<\/p>\n<h2>\u8a08\u7b97\u4f8b<\/h2>\n<p>\u5b9f\u969b\u306b\u3001\u7c21\u5358\u306a\u8a08\u7b97\u4f8b\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002\u4f8b\u3048\u3070\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u30d1\u30e9\u30e1\u30fc\u30bf\u304c\u4e0e\u3048\u3089\u308c\u305f\u5834\u5408\uff1a<\/p>\n<ul>\n<li>P_t = 1 kW (1000 W)<\/li>\n<li>G = 30 dB (1000 \u500d)<\/li>\n<li>\\lambda = 0.03 m<\/li>\n<li>\\sigma = 1 m^2<\/li>\n<li>P_r = 1 \u03bcW (0.000001 W)<\/li>\n<li>L = 2<\/li>\n<\/ul>\n<p>\u307e\u305a\u3001\u30b2\u30a4\u30f3\u3068\u305d\u306e\u4ed6\u306e\u5b9a\u6570\u3092\u9069\u5207\u306a\u5358\u4f4d\u306b\u5909\u63db\u3057\u307e\u3059\u3002\u6b21\u306b\u3001\u65b9\u7a0b\u5f0f\u306b\u4ee3\u5165\u3057\u3066\u8a08\u7b97\u3057\u307e\u3059\uff1a<\/p>\n<pre>\nR = \\left( \\frac{ 1000 \\times 1000^2 \\times 0.03^2 \\times 1 }{ (4 \\pi)^3 \\times 0.000001 \\times 2 } \\right)^{\\frac{1}{4}}\n<\/pre>\n<p>\u8a08\u7b97\u3092\u9032\u3081\u308b\u3068\u3001\u7d50\u679c\u3068\u3057\u3066\u6709\u52b9\u7bc4\u56f2R\u304c\u5f97\u3089\u308c\u307e\u3059\u3002\u3053\u306e\u7d50\u679c\u3092\u3082\u3068\u306b\u3001\u30ec\u30fc\u30c0\u30fc\u30b7\u30b9\u30c6\u30e0\u306e\u8a2d\u8a08\u3084\u914d\u7f6e\u3092\u6700\u9069\u5316\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<h2>\u307e\u3068\u3081<\/h2>\n<p>\u30ec\u30fc\u30c0\u30fc\u7bc4\u56f2\u65b9\u7a0b\u5f0f\u306f\u3001\u30ec\u30fc\u30c0\u30fc\u6280\u8853\u306e\u57fa\u672c\u3092\u7406\u89e3\u3059\u308b\u4e0a\u3067\u6b20\u304b\u305b\u306a\u3044\u30c4\u30fc\u30eb\u3067\u3059\u3002\u30d1\u30e9\u30e1\u30fc\u30bf\u306e\u7406\u89e3\u3068\u6b63\u78ba\u306a\u8a08\u7b97\u306b\u3088\u308a\u3001\u30ec\u30fc\u30c0\u30fc\u306e\u6027\u80fd\u3092\u6700\u5927\u9650\u306b\u5f15\u304d\u51fa\u3059\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u79d1\u5b66\u6280\u8853\u304c\u9032\u6b69\u3059\u308b\u4e2d\u3067\u3001\u3053\u308c\u3089\u306e\u57fa\u790e\u77e5\u8b58\u306f\u5fdc\u7528\u5206\u91ce\u306b\u304a\u3044\u3066\u91cd\u8981\u306a\u5f79\u5272\u3092\u679c\u305f\u3057\u7d9a\u3051\u308b\u3067\u3057\u3087\u3046\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u30ec\u30fc\u30c0\u30fc\u7bc4\u56f2\u65b9\u7a0b\u5f0f\u306e\u6982\u8981\u3068\u8a08\u7b97\u65b9\u6cd5\u3092\u8aac\u660e\u3002\u9001\u4fe1\u96fb\u529b\u3001\u30a2\u30f3\u30c6\u30ca\u30b2\u30a4\u30f3\u3001\u6ce2\u9577\u3001\u30ec\u30fc\u30c0\u30fc\u30af\u30ed\u30b9\u30bb\u30af\u30b7\u30e7\u30f3\u306a\u3069\u306e\u5404\u30d1\u30e9\u30e1\u30fc\u30bf\u306e\u610f\u5473\u3068\u6e2c\u5b9a\u65b9\u6cd5\u306b\u3064\u3044\u3066\u8a73\u8ff0\u3002<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_generate-full-width-content":"","footnotes":""},"categories":[96],"tags":[97],"class_list":["post-209221","post","type-post","status-publish","format-standard","hentry","category-96","tag-97","generate-columns","tablet-grid-50","mobile-grid-100","grid-parent","grid-50"],"yoast_head":"<!-- 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