{"id":11795,"date":"2025-03-13T13:03:16","date_gmt":"2025-03-13T04:03:16","guid":{"rendered":"https:\/\/www11.ieice.org\/cs\/ap\/wp\/?page_id=11795"},"modified":"2025-12-05T18:36:10","modified_gmt":"2025-12-05T09:36:10","slug":"radar_cross_section","status":"publish","type":"page","link":"https:\/\/www.ieice.org\/cs\/ap\/misc\/denpan-db\/prop_model_db\/model_list\/radar_cross_section\/","title":{"rendered":"\u30ec\u30fc\u30c0\u65ad\u9762\u7a4d"},"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
\"\"<\/figure><\/div>\n\n\n
<\/div>\n\n\n\n

\u3000\u56f3\u306e\u3088\u3046\u306b\uff0c\u30bf\u30fc\u30b2\u30c3\u30c8\u306b\u9001\u53d7\u4fe1\u30a2\u30f3\u30c6\u30ca\u65b9\u5411\u304b\u3089\u96fb\u529b\u5bc6\u5ea6\\( p_{tgt} \\)[W\/m2<\/sup>]\u3067\u96fb\u6ce2\u304c\u5230\u6765\u3059\u308b\u3082\u306e\u3068\u3059\u308b\uff0e\u3053\u306e\u3068\u304d\u30bf\u30fc\u30b2\u30c3\u30c8\u306b\u3088\u308a\uff0c\u96fb\u529b\\( p_{tgt} \\)\\( \\cdot \\)\\( \\sigma \\)[W]\u306e\u6563\u4e71\u6ce2\u304c\u7403\u9762\u72b6\u306b\u5747\u4e00\u306b\u653e\u5c04\u3055\u308c\u308b\u3068\u4eee\u5b9a\u3059\u308b\u3068\uff0c\u53d7\u4fe1\u30a2\u30f3\u30c6\u30ca\u70b9\u3067\u89b3\u6e2c\u3055\u308c\u308b\u96fb\u529b\u5bc6\u5ea6\\( p_{ant} \\)[W\/m2<\/sup>]\u306f\uff0c<\/p>\n\n\n\n

\\(
{\\displaystyle
p_{ant} = \\frac{ p_{tgt} \\cdot \\sigma }{ 4 \\pi R^{2} }
}
\\tag{1}
\\)<\/p>\n\n\n\n

\u3068\u8868\u3055\u308c\u308b\uff0e\u305f\u3060\u3057\\( \\sigma \\)\u306f\u30bf\u30fc\u30b2\u30c3\u30c8\u3067\u5165\u5c04\u6ce2\u3092\u5782\u76f4\u306b\u906e\u308b\u9762\u7a4d[m2<\/sup>]\uff0c\\( R \\)\u306f\u30bf\u30fc\u30b2\u30c3\u30c8\u304b\u3089\u53d7\u4fe1\u30a2\u30f3\u30c6\u30ca\u307e\u3067\u306e\u8ddd\u96e2[m]\u3092\u8868\u3059\uff0e\u3053\u3053\u3067\\( R \\)\u304c\u5341\u5206\u306b\u5927\u304d\u3044\u5834\u5408\u3092\u4eee\u5b9a\u3059\u308b\u3068\uff0c\u305d\u306e\u9762\u7a4d\\( \\sigma \\)\u306f,<\/p>\n\n\n\n

\\(
{\\displaystyle
\\sigma = \\lim_{ R \\to \\infty} 4 \\pi R^{2} \\frac{ p_{ant} }{ p_{tgt} } = \\lim_{ R \\to \\infty } 4 \\pi R^{2} \\frac{ |E_{ant}|^{2} }{ |E_{tgt}|^{2} }
}
\\tag{2}
\\)<\/p>\n\n\n\n

\u3068\u8868\u3055\u308c\uff0c\u3053\u306e\u3068\u304d\u306e\u9762\u7a4d\\( \\sigma \\)\u3092\u30ec\u30fc\u30c0\u65ad\u9762\u7a4d\uff08radar cross section, RCS\uff09\u3068\u547c\u3076\uff0e\u305f\u3060\u3057\u5f0f(2)\u306b\u304a\u3044\u3066\uff0c\\( E_{ant} \\)\u3068\\( E_{tgt} \\)\u306f\u305d\u308c\u305e\u308c\u53d7\u4fe1\u30a2\u30f3\u30c6\u30ca\u3068\u30bf\u30fc\u30b2\u30c3\u30c8\u306b\u304a\u3051\u308b\u96fb\u754c\u5f37\u5ea6[V\/m]\u3092\u8868\u3059\uff0e\u3053\u3053\u3067\u5f0f(2)\u306e\\( \\sigma \\)\u306f\uff0c\\( p_{ant} \\)\u306e\u5024\u304c\\( R \\)\u304c\u5341\u5206\u306b\u5927\u304d\u3051\u308c\u3070\\( R^2 \\)\u306b\u53cd\u6bd4\u4f8b\u3059\u308b\u306e\u3067\uff0c\u4e00\u5b9a\u5024\u3067\u8868\u3055\u308c\u308b\uff0e\u307e\u305f\\( \\sigma \\)\u306e\u5358\u4f4d\u306fm2<\/sup>\u3067\u3042\u308b\u304c\uff0c\u30c7\u30b7\u30d9\u30eb\u8868\u8a18\u3067dBsm\uff08decibel squared meter\uff09\u3067\u8868\u3059\u5834\u5408\u3082\u3042\u308b\uff0e
\u3000\u53cd\u5c04\u65b9\u5411\u304c\u53d7\u4fe1\u30a2\u30f3\u30c6\u30ca\u65b9\u5411\u3068\u5fc5\u305a\u3057\u3082\u540c\u3058\u3067\u306a\u3044\u5834\u5408\u306f\uff0c\u6563\u4e71\u65ad\u9762\u7a4d\uff08scattering cross section\uff09\u304c\u5b9a\u7fa9\u3055\u308c\u308b\u304c\uff0c\u30ec\u30fc\u30c0\u65ad\u9762\u7a4d\u306f\u6563\u4e71\u65ad\u9762\u7a4d\u306e\u5b9a\u7fa9\u3092\u53cd\u5c04\u65b9\u5411\u304c\u53d7\u4fe1\u30a2\u30f3\u30c6\u30ca\u65b9\u5411\u3068\u540c\u3058\u5834\u5408\u306e\u7279\u5b9a\u306e\u6761\u4ef6\u306b\u9069\u7528\u3057\u305f\u3082\u306e\u3067\u3042\u308b\uff0e
\u3000\u73fe\u5b9f\u306e\u30ec\u30fc\u30c0\u30bf\u30fc\u30b2\u30c3\u30c8\u306e\\( \\sigma \\)\u3092\u6b63\u78ba\u306b\u8a08\u7b97\u3059\u308b\u3053\u3068\u306f\u96e3\u3057\u3044\u304c\uff0c\u30e2\u30c7\u30eb\u5316\u306b\u3088\u308b\u8fd1\u4f3c\u8a08\u7b97\u306f\u591a\u6570\u8a66\u307f\u3089\u308c\u3066\u3044\u308b\uff0e\u307e\u305f\u5358\u7d14\u306a\u5f62\u72b6\u306e\u53cd\u5c04\u7269\u4f53\u306b\u95a2\u3057\u3066\u306f\uff0c\u89e3\u6790\u7d50\u679c\u304c\u591a\u304f\u306e\u6587\u732e\uff08\u4f8b\u3048\u3070[3]\uff09\u306b\u8a18\u3055\u308c\u3066\u3044\u308b\uff0e<\/p>\n\n\n\n

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

\u3000\u30ec\u30fc\u30c0\u65ad\u9762\u7a4d\u306e\u4e00\u822c\u5f0f\u306f\u5f0f(2)\u3068\u540c\u3058\u6b21\u5f0f\u3067\u3042\u308b\uff0e<\/p>\n\n\n\n

\\(
{\\displaystyle
\\sigma = \\lim_{ R \\to \\infty} 4 \\pi R^{2} \\frac{ p_{ant} }{ p_{tgt} } = \\lim_{ R \\to \\infty } 4 \\pi R^{2} \\frac{ |E_{ant}|^{2} }{ |E_{tgt}|^{2} }
}
\\tag{2}
\\)<\/p>\n\n\n\n

\u307e\u305f\uff0c\u6b63\u65b9\u5e73\u677f\u306e\u30ec\u30fc\u30c0\u65ad\u9762\u7a4d\u306f\u6b21\u5f0f\u3067\u3042\u308b\uff0e<\/p>\n\n\n\n

\\(
{\\displaystyle
\\sigma = \\frac{ 4 \\pi a^{4} }{ \u03bb^{2} } \\left[ {\\rm sinc} \\left( \\frac{ 2 \\pi a }{ \u03bb } \\sin \\theta \\right) \\right]^{2} \\cos^{2} \\theta
}
\\tag{3}
\\)<\/p>\n\n\n\n

\u305f\u3060\u3057\uff0c\\( {\\rm sinc} (x) = \\frac{ \\sin x }{ x } \\)\u3067\uff0c\\( a \\gg \\lambda \\)\u3067\u3042\u308b\uff0e<\/p>\n\n\n\n

\u30d1\u30e9\u30e1\u30fc\u30bf<\/h3>\n\n\n\n
\n
\n
\u8a18\u53f7<\/td>\u30d1\u30e9\u30e1\u30fc\u30bf\u8aac\u660e[\u5358\u4f4d]<\/td><\/tr>
\\( \\sigma \\)<\/td>\u30ec\u30fc\u30c0\u65ad\u9762\u7a4d [m2<\/sup>]<\/td><\/tr>
\\( R \\)<\/td>\u30bf\u30fc\u30b2\u30c3\u30c8\u304b\u3089\u53d7\u4fe1\u30a2\u30f3\u30c6\u30ca\u307e\u3067\u306e\u8ddd\u96e2 [m]<\/td><\/tr>
\\( p_{ant} \\)<\/td>\u53d7\u4fe1\u30a2\u30f3\u30c6\u30ca\u70b9\u3067\u89b3\u6e2c\u3055\u308c\u308b\u96fb\u529b\u5bc6\u5ea6 [W\/m2<\/sup>]<\/td><\/tr>
\\( p_{tgt} \\)<\/td>\u30bf\u30fc\u30b2\u30c3\u30c8\u306b\u9001\u4fe1\u30a2\u30f3\u30c6\u30ca\u65b9\u5411\u304b\u3089\u5230\u6765\u3059\u308b\u96fb\u529b\u5bc6\u5ea6 [W\/m2<\/sup>]<\/td><\/tr>
\\( E_{ant} \\)<\/td>\u53d7\u4fe1\u30a2\u30f3\u30c6\u30ca\u70b9\u3067\u89b3\u6e2c\u3055\u308c\u308b\u96fb\u754c\u5f37\u5ea6 [V\/m]<\/td><\/tr>
\\( E_{tgt} \\)<\/td>\u30bf\u30fc\u30b2\u30c3\u30c8\u306b\u9001\u4fe1\u30a2\u30f3\u30c6\u30ca\u65b9\u5411\u304b\u3089\u5230\u6765\u3059\u308b\u96fb\u754c\u5f37\u5ea6 [V\/m]<\/td><\/tr>
\\( a \\)<\/td>\u6b63\u65b9\u5e73\u677f\u306e\u8fba\u306e\u9577\u3055 [m]<\/td><\/tr>
\\( \\lambda \\)<\/td>\u6ce2\u9577 [m]<\/td><\/tr>
\\( \\theta \\)<\/td>\u5e73\u677f\u6b63\u9762\u306b\u5bfe\u3059\u308b\u5165\u5c04\u89d2 [rad]<\/td><\/tr><\/tbody><\/table><\/figure>\n<\/div>\n<\/div>\n\n\n\n

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

\u3000\u6570\u5f0f\u306e\u78ba\u8a8d\u306e\u305f\u3081\u306b\uff0c\u5468\u6ce2\u6570\u304c28GHz\u3067\u6b63\u65b9\u5e73\u677f\u306e\u5927\u304d\u3055\u3092\u5909\u3048\u305f\u3068\u304d\u306e\u8a08\u7b97\u7d50\u679c\u3092\u793a\u3059\uff0e\u306a\u304a\uff0c\u30ec\u30fc\u30c0\u65ad\u9762\u7a4d\u304c\\( \\sigma \\)[m2<\/sup>]\u3067\u3042\u308c\u3070\uff0cdB\u8868\u793a\u3067\\( 10 \\log_{10} \\sigma \\)[dBsm]\u3067\u3042\u308b\uff0e<\/p>\n\n\n

\n
\"\"
\u69d8\u3005\u306a\u5927\u304d\u3055\u306e\u6b63\u65b9\u5e73\u677f\u306e\u30ec\u30fc\u30c0\u65ad\u9762\u7a4d\u306e\u5165\u5c04\u89d2\u7279\u6027<\/figcaption><\/figure><\/div>\n\n\n

\u53c2\u7167<\/h2>\n\n\n\n[1] \u4f0a\u85e4\u4fe1\u4e00, \u201c\u30ec\u30fc\u30c0\u30b7\u30b9\u30c6\u30e0\u306e\u57fa\u790e\u7406\u8ad6,\u201d \u30b3\u30ed\u30ca\u793e, \u6771\u4eac, 2015.
[2] \u96fb\u5b50\u60c5\u5831\u901a\u4fe1\u5b66\u4f1a\uff08\u7de8\uff09, \u201c\u30a2\u30f3\u30c6\u30ca\u5de5\u5b66\u30cf\u30f3\u30c9\u30d6\u30c3\u30af\uff08\u7b2c2\u7248\uff09,\u201d \u30aa\u30fc\u30e0\u793e, \u6771\u4eac, 2008.
[3] \u5c71\u53e3\u82b3\u96c4, \u201c\u30ec\u30fc\u30c0\u30dd\u30fc\u30e9\u30ea\u30e1\u30c8\u30ea\u306e\u57fa\u790e\u3068\u5fdc\u7528,\u201d \u96fb\u5b50\u60c5\u5831\u901a\u4fe1\u5b66\u4f1a, \u6771\u4eac, 2007.<\/p>\n","protected":false},"excerpt":{"rendered":"

\u30e2\u30c7\u30eb\u306e\u6982\u8981 \u3000\u56f3\u306e\u3088\u3046\u306b\uff0c\u30bf\u30fc\u30b2\u30c3\u30c8\u306b\u9001\u53d7\u4fe1\u30a2\u30f3\u30c6\u30ca\u65b9\u5411\u304b\u3089\u96fb\u529b\u5bc6\u5ea6\\( p_{tgt} \\)[W\/m2]\u3067\u96fb\u6ce2\u304c\u5230\u6765\u3059\u308b\u3082\u306e\u3068\u3059\u308b\uff0e\u3053\u306e\u3068\u304d\u30bf\u30fc\u30b2\u30c3\u30c8\u306b\u3088\u308a\uff0c\u96fb\u529b\\( p_{tgt} \\)\\( \\cdot \\)\\( […]<\/p>\n","protected":false},"author":5,"featured_media":0,"parent":12073,"menu_order":3,"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-11795","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.ieice.org\/cs\/ap\/wp-json\/wp\/v2\/pages\/11795","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=11795"}],"version-history":[{"count":53,"href":"https:\/\/www.ieice.org\/cs\/ap\/wp-json\/wp\/v2\/pages\/11795\/revisions"}],"predecessor-version":[{"id":14859,"href":"https:\/\/www.ieice.org\/cs\/ap\/wp-json\/wp\/v2\/pages\/11795\/revisions\/14859"}],"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=11795"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}