{"id":160,"date":"2026-04-26T00:15:57","date_gmt":"2026-04-25T16:15:57","guid":{"rendered":"https:\/\/thebg5hvn.top\/?p=160"},"modified":"2026-04-26T07:28:54","modified_gmt":"2026-04-25T23:28:54","slug":"lna-preamp-vs-internal-preamp","status":"publish","type":"post","link":"https:\/\/thebg5hvn.top\/index.php\/2026\/04\/26\/lna-preamp-vs-internal-preamp\/","title":{"rendered":"\ud83d\udce1 \u5916\u7f6e\u4f4e\u566a\u653e\u4e3a\u4ec0\u4e48\u6bd4\u9891\u8c31\u4eea\u5185\u7f6e\u9884\u653e\u66f4\u9002\u5408\u5fae\u5f31\u4fe1\u53f7\u76d1\u6d4b\uff1f"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\"><strong>\ud83d\udccc \u6838\u5fc3\u7ed3\u8bba<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5916\u7f6e\u4f4e\u566a\u653e\u7684\u610f\u4e49\uff0c\u4e0d\u53ea\u662f\u201c\u628a\u4fe1\u53f7\u653e\u5927\u4e86\u591a\u5c11 dB\u201d\uff0c\u66f4\u91cd\u8981\u7684\u662f\u5b83\u653e\u5728\u63a5\u6536\u94fe\u8def\u6700\u524d\u7aef\uff0c \u80fd\u5728\u4fe1\u53f7\u88ab\u9988\u7ebf\u3001\u8f6c\u63a5\u5934\u548c\u9891\u8c31\u4eea\u524d\u7aef\u635f\u8017\u524a\u5f31\u4e4b\u524d\uff0c\u5148\u8fdb\u884c\u4f4e\u566a\u58f0\u653e\u5927\u3002 \u56e0\u6b64\uff0c\u5728\u9ad8\u9891\u6bb5\u3001\u957f\u9988\u7ebf\u3001\u5fae\u5f31\u4fe1\u53f7\u76d1\u6d4b\u573a\u666f\u4e0b\uff0c\u5916\u7f6e\u4f4e\u566a\u653e\u901a\u5e38\u6bd4\u5355\u7eaf\u4f9d\u8d56\u9891\u8c31\u4eea\u5185\u7f6e\u9884\u653e\u66f4\u6709\u610f\u4e49\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\ud83e\udded \u4e00\u3001\u95ee\u9898\u662f\u600e\u4e48\u51fa\u73b0\u7684\uff1f<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u5728\u65e0\u7ebf\u7535\u76d1\u6d4b\u4e2d\uff0c\u7ecf\u5e38\u4f1a\u9047\u5230\u4e00\u79cd\u73b0\u8c61\uff1a\u9891\u8c31\u4eea\u5df2\u7ecf\u6253\u5f00\u4e86\u5185\u7f6e\u9884\u653e\uff0c\u4f46\u67d0\u4e9b\u5fae\u5f31\u4fe1\u53f7\u4ecd\u7136\u770b\u4e0d\u5230\uff1b \u800c\u4e00\u65e6\u5728\u5929\u7ebf\u7aef\u52a0\u4e0a\u4e00\u4e2a\u5916\u7f6e\u4f4e\u566a\u58f0\u653e\u5927\u5668\uff0c\u4fe1\u53f7\u5c31\u4ece\u5e95\u566a\u91cc\u201c\u5192\u51fa\u6765\u201d\u4e86\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u8bf4\u660e\uff0c\u5916\u7f6e\u4f4e\u566a\u653e\u7684\u4f5c\u7528\u5e76\u4e0d\u662f\u7b80\u5355\u5730\u201c\u628a\u4fe1\u53f7\u53d8\u5927\u201d\uff0c\u800c\u662f\u548c\u6574\u4e2a\u63a5\u6536\u7cfb\u7edf\u7684\u566a\u58f0\u7cfb\u6570\u3001 \u9988\u7ebf\u635f\u8017\u3001\u9891\u8c31\u4eea\u81ea\u8eab\u5e95\u566a\u3001RBW \u8bbe\u7f6e\u4ee5\u53ca\u52a8\u6001\u8303\u56f4\u90fd\u6709\u5173\u7cfb\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u7bc7\u6587\u7ae0\u60f3\u56de\u7b54\u4e09\u4e2a\u95ee\u9898\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u2705 \u5916\u7f6e\u4f4e\u566a\u653e\u548c\u9891\u8c31\u4eea\u5185\u7f6e\u9884\u653e\u5230\u5e95\u6709\u4ec0\u4e48\u672c\u8d28\u533a\u522b\uff1f<\/li>\n\n\n\n<li>\u2705 \u4e3a\u4ec0\u4e48\u5916\u7f6e\u4f4e\u566a\u653e\u5bf9\u5fae\u5f31\u4fe1\u53f7\u76d1\u6d4b\u5f80\u5f80\u66f4\u6709\u610f\u4e49\uff1f<\/li>\n\n\n\n<li>\u2705 \u5916\u7f6e\u4f4e\u566a\u653e\u548c\u5185\u7f6e\u9884\u653e\u80fd\u4e0d\u80fd\u540c\u65f6\u6253\u5f00\uff1f<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\ud83d\udccd \u4e8c\u3001\u5148\u770b\u4f4d\u7f6e\uff1a\u4e24\u8005\u6839\u672c\u4e0d\u5728\u63a5\u6536\u94fe\u8def\u7684\u540c\u4e00\u4e2a\u5730\u65b9<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u9891\u8c31\u4eea\u5185\u7f6e\u9884\u653e\u5b89\u88c5\u5728\u9891\u8c31\u4eea\u5185\u90e8\uff0c\u5c5e\u4e8e\u4eea\u8868\u524d\u7aef\u94fe\u8def\u7684\u4e00\u90e8\u5206\u3002 \u5916\u7f6e\u4f4e\u566a\u653e\u5b89\u88c5\u5728\u5929\u7ebf\u548c\u9891\u8c31\u4eea\u4e4b\u95f4\uff0c\u901a\u5e38\u5e94\u5c3d\u91cf\u9760\u8fd1\u5929\u7ebf\u9988\u7535\u53e3\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u2460 \u53ea\u4f7f\u7528\u9891\u8c31\u4eea\u5185\u7f6e\u9884\u653e\u65f6\uff1a<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">\u5929\u7ebf \u2192 \u9988\u7ebf\/\u8f6c\u63a5\u5934 \u2192 \u9891\u8c31\u4eea\u8f93\u5165\u7aef \u2192 \u9891\u8c31\u4eea\u5185\u7f6e\u9884\u653e<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u2461 \u4f7f\u7528\u5916\u7f6e\u4f4e\u566a\u653e\u65f6\uff1a<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">\u5929\u7ebf \u2192 \u5916\u7f6e\u4f4e\u566a\u653e \u2192 \u9988\u7ebf\/\u8f6c\u63a5\u5934 \u2192 \u9891\u8c31\u4eea\u8f93\u5165\u7aef<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u5bf9\u5fae\u5f31\u4fe1\u53f7\u6765\u8bf4\uff0c\u8fd9\u4e2a\u4f4d\u7f6e\u5dee\u5f02\u975e\u5e38\u5173\u952e\u3002 \u5982\u679c\u5f31\u4fe1\u53f7\u5148\u7ecf\u8fc7\u9988\u7ebf\u548c\u8f6c\u63a5\u5934\uff0c\u518d\u8fdb\u5165\u9891\u8c31\u4eea\u5185\u7f6e\u9884\u653e\uff0c \u90a3\u4e48\u4fe1\u53f7\u5728\u88ab\u653e\u5927\u4e4b\u524d\u5df2\u7ecf\u5148\u88ab\u524a\u5f31\u4e86\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u800c\u5982\u679c\u5916\u7f6e\u4f4e\u566a\u653e\u653e\u5728\u5929\u7ebf\u53e3\u9644\u8fd1\uff0c\u5f31\u4fe1\u53f7\u53ef\u4ee5\u5728\u7ecf\u8fc7\u9988\u7ebf\u635f\u8017\u4e4b\u524d\u5148\u88ab\u4f4e\u566a\u58f0\u653e\u5927\uff0c \u8fd9\u6837\u540e\u9762\u7684\u9988\u7ebf\u635f\u8017\u548c\u9891\u8c31\u4eea\u81ea\u8eab\u566a\u58f0\u5bf9\u7cfb\u7edf\u7075\u654f\u5ea6\u7684\u5f71\u54cd\u90fd\u4f1a\u88ab\u663e\u8457\u538b\u4f4e\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\ud83d\udca1 \u4e00\u53e5\u8bdd\u7406\u89e3\uff1a<\/strong>\u5185\u7f6e\u9884\u653e\u662f\u5728\u201c\u4fe1\u53f7\u5df2\u7ecf\u5230\u9891\u8c31\u4eea\u4ee5\u540e\u201d\u518d\u653e\u5927\uff1b\u5916\u7f6e\u4f4e\u566a\u653e\u662f\u5728\u201c\u4fe1\u53f7\u521a\u4ece\u5929\u7ebf\u51fa\u6765\u65f6\u201d\u5c31\u5148\u653e\u5927\u3002\u5bf9\u5fae\u5f31\u4fe1\u53f7\u6765\u8bf4\uff0c\u8d8a\u65e9\u4f4e\u566a\u58f0\u653e\u5927\u8d8a\u6709\u5229\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\ud83d\udd27 \u4e09\u3001\u9891\u8c31\u4eea\u5185\u7f6e\u9884\u653e\u5230\u5e95\u5728\u5e72\u4ec0\u4e48\uff1f<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u9891\u8c31\u4eea\u5185\u7f6e\u9884\u653e\u7684\u4e3b\u8981\u4f5c\u7528\uff0c\u662f\u6539\u5584\u9891\u8c31\u4eea\u81ea\u8eab\u7684\u663e\u793a\u5e73\u5747\u566a\u58f0\u7535\u5e73\uff0c \u4e5f\u5c31\u662f\u5e38\u8bf4\u7684\u201c\u964d\u4f4e\u4eea\u8868\u81ea\u8eab\u5e95\u566a\u201d\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4f8b\u5982\uff0c\u4e00\u4e2a 800 MHz \u4fe1\u53f7\u5728\u5185\u7f6e\u9884\u653e\u5173\u95ed\u65f6\u6d4b\u5f97\uff1a $$ P_{\\mathrm{in}}=-70\\ \\mathrm{dBm} $$<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u6253\u5f00 10 dB \u5185\u7f6e\u9884\u653e\u540e\uff0c\u9891\u8c31\u4eea\u5185\u90e8\u94fe\u8def\u4e2d\u7684\u4fe1\u53f7\u4f1a\u88ab\u653e\u5927\u5230\uff1a $$ P_{\\mathrm{internal}}=-70+10=-60\\ \\mathrm{dBm} $$<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4f46\u9891\u8c31\u4eea\u901a\u5e38\u4f1a\u81ea\u52a8\u8fdb\u884c\u5e45\u5ea6\u8865\u507f\uff0c\u56e0\u6b64\u6700\u7ec8\u5c4f\u5e55\u663e\u793a\u7684\u4fe1\u53f7\u529f\u7387\u4ecd\u5927\u81f4\u4fdd\u6301\u4e0d\u53d8\uff1a $$ P_{\\mathrm{display}}=-60-10=-70\\ \\mathrm{dBm} $$<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u6240\u4ee5\uff0c\u5185\u7f6e\u9884\u653e\u4e0d\u662f\u4e3a\u4e86\u8ba9\u5df2\u6821\u51c6\u7684\u4fe1\u53f7\u8bfb\u6570\u53d8\u5927\uff0c \u800c\u662f\u4e3a\u4e86\u964d\u4f4e\u9891\u8c31\u4eea\u81ea\u8eab\u566a\u58f0\uff0c\u4f7f\u5f31\u4fe1\u53f7\u66f4\u5bb9\u6613\u4ece\u4eea\u8868\u5e95\u566a\u4e2d\u663e\u73b0\u51fa\u6765\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u26a0\ufe0f \u6ce8\u610f\uff1a<\/strong>\u5185\u7f6e\u9884\u653e\u53ea\u80fd\u6539\u5584\u9891\u8c31\u4eea\u5185\u90e8\u7684\u566a\u58f0\u8868\u73b0\uff0c\u4e0d\u80fd\u8865\u6551\u9891\u8c31\u4eea\u8f93\u5165\u7aef\u4e4b\u524d\u5df2\u7ecf\u53d1\u751f\u7684\u9988\u7ebf\u635f\u8017\u3001\u8f6c\u63a5\u635f\u8017\u548c\u524d\u7aef\u4fe1\u53f7\u635f\u5931\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\ud83d\ude80 \u56db\u3001\u5916\u7f6e\u4f4e\u566a\u653e\u7684\u6838\u5fc3\u4ef7\u503c\u662f\u4ec0\u4e48\uff1f<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u5916\u7f6e\u4f4e\u566a\u653e\u7684\u6838\u5fc3\u4ef7\u503c\uff0c\u662f\u628a\u63a5\u6536\u94fe\u8def\u4e2d\u7684\u7b2c\u4e00\u4e2a\u6709\u6e90\u5668\u4ef6\u5c3d\u91cf\u524d\u79fb\u5230\u5929\u7ebf\u53e3\u9644\u8fd1\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5b83\u9996\u5148\u653e\u5927\u7684\uff0c\u4e0d\u662f\u9891\u8c31\u4eea\u5185\u90e8\u566a\u58f0\uff0c\u800c\u662f\u5929\u7ebf\u7aef\u8fdb\u5165\u4f4e\u566a\u653e\u7684\u5185\u5bb9\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">\u76ee\u6807\u4fe1\u53f7 + \u5929\u7ebf\u63a5\u6536\u5230\u7684\u5916\u754c\u566a\u58f0 + \u5929\u7ebf\u7aef\u70ed\u566a\u58f0<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u5982\u679c\u5916\u7f6e\u4f4e\u566a\u653e\u589e\u76ca\u4e3a G\uff0c\u90a3\u4e48\u4fe1\u53f7\u4f1a\u88ab\u653e\u5927\u4e3a\uff1a $$ P_{\\mathrm{signal,out}}=P_{\\mathrm{signal,in}}+G $$<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fdb\u5165\u4f4e\u566a\u653e\u7684\u566a\u58f0\u4e5f\u4f1a\u88ab\u653e\u5927\u4e3a\uff1a $$ P_{\\mathrm{noise,out}}=P_{\\mathrm{noise,in}}+G $$<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u56e0\u6b64\uff0c\u5916\u7f6e\u4f4e\u566a\u653e\u5e76\u4e0d\u4f1a\u795e\u5947\u5730\u6539\u5584\u4fe1\u53f7\u76f8\u5bf9\u4e8e\u201c\u5916\u754c\u566a\u58f0\u201d\u7684\u672c\u8d28\u4fe1\u566a\u6bd4\u3002 \u5b83\u771f\u6b63\u89e3\u51b3\u7684\u662f\uff1a\u628a\u5929\u7ebf\u7aef\u5df2\u6709\u7684\u4fe1\u53f7\u548c\u566a\u58f0\u4e00\u8d77\u63d0\u524d\u62ac\u9ad8\uff0c \u4f7f\u540e\u9762\u7684\u9988\u7ebf\u635f\u8017\u548c\u9891\u8c31\u4eea\u81ea\u8eab\u566a\u58f0\u4e0d\u518d\u6210\u4e3a\u4e3b\u8981\u9650\u5236\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\ud83c\udfaf \u5173\u952e\u70b9\uff1a<\/strong>\u5916\u7f6e\u4f4e\u566a\u653e\u4e0d\u662f\u8ba9\u201c\u4fe1\u53f7\u76f8\u5bf9\u4e8e\u5916\u754c\u566a\u58f0\u201d\u53d8\u597d\uff0c\u800c\u662f\u8ba9\u201c\u9891\u8c31\u4eea\u81ea\u8eab\u566a\u58f0\u548c\u540e\u7ea7\u635f\u8017\u201d\u4e0d\u518d\u538b\u5236\u5fae\u5f31\u4fe1\u53f7\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\ud83c\udf21\ufe0f \u4e94\u3001\u8fdb\u5165\u5916\u7f6e\u4f4e\u566a\u653e\u7684\u566a\u58f0\u7531\u4ec0\u4e48\u51b3\u5b9a\uff1f<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fdb\u5165\u5916\u7f6e\u4f4e\u566a\u653e\u8f93\u5165\u7aef\u7684\u566a\u58f0\uff0c\u4e3b\u8981\u7531\u5929\u7ebf\u7b49\u6548\u566a\u58f0\u6e29\u5ea6\u51b3\u5b9a\u3002 \u5929\u7ebf\u7b49\u6548\u566a\u58f0\u6e29\u5ea6\u4e0e\u5929\u7ebf\u770b\u5230\u7684\u5929\u7a7a\u3001\u5730\u9762\u3001\u5efa\u7b51\u7269\u3001\u70ed\u6e90\u3001\u4eba\u5de5\u566a\u58f0\u548c\u7535\u78c1\u73af\u5883\u6709\u5173\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u4e2a\u566a\u58f0\u66f4\u51c6\u786e\u5730\u8bf4\uff0c\u5e94\u5148\u8868\u793a\u6210\u566a\u58f0\u8c31\u5bc6\u5ea6\uff0c\u800c\u4e0d\u662f\u4e00\u4e2a\u5b64\u7acb\u7684 dBm \u6570\u503c\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5f53\u5929\u7ebf\u7b49\u6548\u566a\u58f0\u6e29\u5ea6\u63a5\u8fd1 290 K \u65f6\uff0c\u5929\u7ebf\u7aef\u70ed\u566a\u58f0\u8c31\u5bc6\u5ea6\u7ea6\u4e3a\uff1a $$ N_{\\mathrm{ant}}\\approx -174\\ \\mathrm{dBm\/Hz} $$<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5982\u679c\u5929\u7ebf\u7b49\u6548\u566a\u58f0\u6e29\u5ea6\u4e0d\u662f 290 K\uff0c\u5219\u53ef\u4ee5\u5199\u6210\uff1a $$ \\begin{aligned} N_{\\mathrm{ant}} &amp;=-174+10\\log_{10}\\left(\\frac{T_a}{290}\\right) \\\\ &amp;\\quad \\mathrm{dBm\/Hz} \\end{aligned} $$<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u91cc\u8981\u7279\u522b\u6ce8\u610f\uff1a\u8fd9\u4e2a\u566a\u58f0\u8c31\u5bc6\u5ea6\u662f\u5929\u7ebf\u7aef\u8fdb\u5165\u4f4e\u566a\u653e\u7684\u566a\u58f0\u5f3a\u5ea6\uff0c \u4e0e\u9891\u8c31\u4eea RBW \u6ca1\u6709\u56e0\u679c\u5173\u7cfb\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">RBW \u4e0d\u662f\u51b3\u5b9a\u8fdb\u5165\u4f4e\u566a\u653e\u7684\u566a\u58f0\u6765\u6e90\uff0c \u800c\u662f\u51b3\u5b9a\u9891\u8c31\u4eea\u5c4f\u5e55\u4e0a\u628a\u591a\u5bbd\u8303\u56f4\u5185\u7684\u566a\u58f0\u7d2f\u8ba1\u6210\u4e00\u4e2a\u663e\u793a\u529f\u7387\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\ud83d\udcc9 \u516d\u3001\u9891\u8c31\u4eea\u81ea\u8eab\u5e95\u566a\u600e\u4e48\u4f30\u7b97\uff1f<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u5355\u72ec\u770b\u9891\u8c31\u4eea\u65f6\uff0c\u5176\u81ea\u8eab\u5e95\u566a\u901a\u5e38\u53ef\u4ee5\u7528\u4e0b\u9762\u7684\u5de5\u7a0b\u516c\u5f0f\u4f30\u7b97\uff1a $$ \\begin{aligned} P_{\\mathrm{SA,noise}} &amp;=-174+10\\log_{10}(\\mathrm{RBW}) \\\\ &amp;\\quad +NF_{\\mathrm{SA}} \\end{aligned} $$<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5176\u4e2d\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>-174 dBm\/Hz<\/strong>\uff1a\u5e38\u6e29\u70ed\u566a\u58f0\u8c31\u5bc6\u5ea6<\/li>\n\n\n\n<li><strong>RBW<\/strong>\uff1a\u9891\u8c31\u4eea\u5206\u8fa8\u7387\u5e26\u5bbd<\/li>\n\n\n\n<li><strong>NFSA<\/strong>\uff1a\u9891\u8c31\u4eea\u81ea\u8eab\u566a\u58f0\u7cfb\u6570<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u4f8b\u5982\uff0c\u5047\u8bbe\u9891\u8c31\u4eea\u81ea\u8eab\u566a\u58f0\u7cfb\u6570\u4e3a 25 dB\uff0cRBW \u4e3a 100 Hz\uff0c\u5219\u5176\u81ea\u8eab\u5e95\u566a\u7ea6\u4e3a\uff1a $$ \\begin{aligned} P_{\\mathrm{SA,noise}} &amp;=-174+10\\log_{10}(100)+25 \\\\ &amp;=-174+20+25 \\\\ &amp;=-129\\ \\mathrm{dBm} \\end{aligned} $$<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5982\u679c\u4e00\u4e2a\u5fae\u5f31\u4fe1\u53f7\u53ea\u6709 -150 dBm\uff0c\u76f4\u63a5\u8fdb\u5165\u9891\u8c31\u4eea\u65f6\uff0c \u5b83\u6bd4\u9891\u8c31\u4eea\u81ea\u8eab\u5e95\u566a\u4f4e\u5f88\u591a\uff0c\u56e0\u6b64\u901a\u5e38\u770b\u4e0d\u5230\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\ud83e\uddea \u4e03\u3001\u4e3a\u4ec0\u4e48\u52a0\u5916\u7f6e\u4f4e\u566a\u653e\u540e\uff0c\u5f31\u4fe1\u53f7\u53ef\u80fd\u5c31\u201c\u5192\u51fa\u6765\u201d\u4e86\uff1f<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u5047\u8bbe\u5929\u7ebf\u7aef\u6709\u4e00\u4e2a\u5fae\u5f31\u7a84\u5e26\u4fe1\u53f7\uff1a $$ P_s=-150\\ \\mathrm{dBm} $$<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u9891\u8c31\u4eea\u81ea\u8eab\u5e95\u566a\u7ea6\u4e3a\uff1a $$ P_{\\mathrm{SA,noise}}=-129\\ \\mathrm{dBm} $$<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u6b64\u65f6\uff0c\u4fe1\u53f7\u6bd4\u9891\u8c31\u4eea\u5e95\u566a\u4f4e\uff1a $$ -150-(-129)=-21\\ \\mathrm{dB} $$<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e5f\u5c31\u662f\u8bf4\uff0c\u76f4\u63a5\u63a5\u9891\u8c31\u4eea\u65f6\uff0c\u8fd9\u4e2a\u4fe1\u53f7\u901a\u5e38\u770b\u4e0d\u5230\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u73b0\u5728\u5728\u5929\u7ebf\u7aef\u9644\u8fd1\u63a5\u5165\u4e00\u4e2a\u5916\u7f6e\u4f4e\u566a\u653e\uff0c\u5047\u8bbe\u5176\u589e\u76ca\u4e3a 40 dB\uff0c\u5219\u4fe1\u53f7\u8fdb\u5165\u9891\u8c31\u4eea\u524d\u88ab\u62ac\u9ad8\u4e3a\uff1a $$ P_{s,\\mathrm{out}}=-150+40=-110\\ \\mathrm{dBm} $$<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u540c\u65f6\uff0c\u5929\u7ebf\u7aef\u8fdb\u5165\u4f4e\u566a\u653e\u7684\u566a\u58f0\u8c31\u5bc6\u5ea6\u4e5f\u88ab\u62ac\u9ad8\u3002 \u5047\u8bbe\u5929\u7ebf\u7b49\u6548\u566a\u58f0\u6e29\u5ea6\u63a5\u8fd1 290 K\uff0c\u5916\u7f6e\u4f4e\u566a\u653e\u566a\u58f0\u7cfb\u6570\u4e3a 1 dB\uff0c \u5219\u4f4e\u566a\u653e\u8f93\u51fa\u7aef\u566a\u58f0\u8c31\u5bc6\u5ea6\u53ef\u8fd1\u4f3c\u5199\u4e3a\uff1a $$ \\begin{aligned} N_{\\mathrm{LNA,out}} &amp;\\approx -174+40+1 \\\\ &amp;=-133\\ \\mathrm{dBm\/Hz} \\end{aligned} $$<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5982\u679c\u9891\u8c31\u4eea RBW \u4e3a 100 Hz\uff0c\u5219\u5c4f\u5e55\u4e0a\u7531\u8fd9\u90e8\u5206\u524d\u7aef\u566a\u58f0\u5f62\u6210\u7684\u566a\u58f0\u529f\u7387\u7ea6\u4e3a\uff1a $$ \\begin{aligned} P_{\\mathrm{LNA,out,noise}} &amp;=-133+10\\log_{10}(100) \\\\ &amp;=-133+20 \\\\ &amp;=-113\\ \\mathrm{dBm} \\end{aligned} $$<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u6b64\u65f6\uff0c\u4fe1\u53f7\u7ea6\u4e3a -110 dBm\uff0c\u524d\u7aef\u566a\u58f0\u7ea6\u4e3a -113 dBm\uff0c\u56e0\u6b64\uff1a $$ -110-(-113)=3\\ \\mathrm{dB} $$<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e5f\u5c31\u662f\u8bf4\uff0c\u8fd9\u4e2a\u539f\u672c\u5b8c\u5168\u6df9\u6ca1\u5728\u9891\u8c31\u4eea\u81ea\u8eab\u5e95\u566a\u91cc\u7684\u4fe1\u53f7\uff0c \u73b0\u5728\u7406\u8bba\u4e0a\u6709\u673a\u4f1a\u4ece\u5e95\u566a\u4e0a\u65b9\u663e\u73b0\u51fa\u6765\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u2705 \u8fd9\u5c31\u662f\u5916\u7f6e\u4f4e\u566a\u653e\u7684\u610f\u4e49\uff1a<\/strong>\u5b83\u8ba9\u9891\u8c31\u4eea\u81ea\u8eab\u5e95\u566a\u4e0d\u518d\u662f\u4e3b\u8981\u9650\u5236\uff0c\u5f31\u4fe1\u53f7\u5c31\u66f4\u6709\u673a\u4f1a\u88ab\u770b\u5230\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\ud83e\udde0 \u516b\u3001\u4e3a\u4ec0\u4e48\u4e0d\u80fd\u7b80\u5355\u8bf4\u201c\u52a0\u4e86 40 dB \u4f4e\u566a\u653e\u5c31\u4e00\u5b9a\u80fd\u770b\u5230\u201d\uff1f<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e0d\u80fd\u8fd9\u6837\u7b80\u5355\u7406\u89e3\u3002\u56e0\u4e3a\u5916\u7f6e\u4f4e\u566a\u653e\u5e76\u4e0d\u80fd\u6539\u53d8\u4fe1\u53f7\u76f8\u5bf9\u4e8e\u5929\u7ebf\u7aef\u5916\u754c\u566a\u58f0\u7684\u672c\u8d28\u4fe1\u566a\u6bd4\uff0c \u5b83\u53ea\u80fd\u628a\u5929\u7ebf\u7aef\u5df2\u6709\u7684\u4fe1\u53f7\u548c\u566a\u58f0\u4e00\u8d77\u62ac\u9ad8\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u6700\u7ec8\u80fd\u4e0d\u80fd\u5728\u9891\u8c31\u4eea\u4e0a\u770b\u89c1\uff0c\u8fd8\u548c <strong>RBW<\/strong> \u6709\u5f88\u5927\u5173\u7cfb\u3002 RBW \u8d8a\u7a84\uff0c\u5c4f\u5e55\u4e0a\u7d2f\u8ba1\u7684\u566a\u58f0\u529f\u7387\u8d8a\u4f4e\uff1bRBW \u8d8a\u5bbd\uff0c\u7d2f\u8ba1\u7684\u566a\u58f0\u529f\u7387\u8d8a\u9ad8\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4ecd\u4ee5\u4e0a\u9762\u7684\u4f4e\u566a\u653e\u8f93\u51fa\u566a\u58f0\u8c31\u5bc6\u5ea6\u4e3a\u4f8b\uff1a $$ N_{\\mathrm{LNA,out}}\\approx -133\\ \\mathrm{dBm\/Hz} $$<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5f53 RBW \u4e3a 100 Hz \u65f6\uff0c\u5c4f\u5e55\u566a\u58f0\u7ea6\u4e3a\uff1a $$ \\begin{aligned} P_{\\mathrm{noise}} &amp;=-133+10\\log_{10}(100) \\\\ &amp;=-113\\ \\mathrm{dBm} \\end{aligned} $$<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5982\u679c RBW \u6539\u6210 10 kHz\uff0c\u5219\u5c4f\u5e55\u566a\u58f0\u7ea6\u4e3a\uff1a $$ \\begin{aligned} P_{\\mathrm{noise}} &amp;=-133+10\\log_{10}(10000) \\\\ &amp;=-133+40 \\\\ &amp;=-93\\ \\mathrm{dBm} \\end{aligned} $$<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u800c\u4fe1\u53f7\u4ecd\u7136\u662f\uff1a $$ P_{s,\\mathrm{out}}=-110\\ \\mathrm{dBm} $$<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u65f6\u4fe1\u53f7\u53cd\u800c\u6bd4\u566a\u58f0\u4f4e\uff1a $$ -110-(-93)=-17\\ \\mathrm{dB} $$<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u6240\u4ee5\uff0c\u5373\u4f7f\u4fe1\u53f7\u7ecf\u8fc7\u4e86 40 dB \u5916\u7f6e\u4f4e\u566a\u653e\u62ac\u5347\uff0c \u5728\u8f83\u5bbd RBW \u4e0b\u4ecd\u7136\u53ef\u80fd\u88ab\u566a\u58f0\u6df9\u6ca1\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\ud83d\udea8 \u91cd\u8981\u63d0\u9192\uff1a<\/strong>\u5916\u7f6e\u4f4e\u566a\u653e\u80fd\u89e3\u51b3\u7684\u662f\u201c\u9891\u8c31\u4eea\u81ea\u8eab\u4e0d\u591f\u7075\u654f\u201d\u7684\u95ee\u9898\uff0c\u4e0d\u80fd\u7a81\u7834\u5916\u754c\u566a\u58f0\u548c\u70ed\u566a\u58f0\u51b3\u5b9a\u7684\u7269\u7406\u6781\u9650\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\ud83d\udef0\ufe0f \u4e5d\u3001\u4e3a\u4ec0\u4e48 Ku \u6ce2\u6bb5\u5fae\u5f31\u4fe1\u53f7\u76d1\u6d4b\u66f4\u9002\u5408\u5916\u7f6e\u4f4e\u566a\u653e\uff1f<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u5728 14.5 GHz \u8fd9\u6837\u7684 Ku \u6ce2\u6bb5\uff0c\u9988\u7ebf\u3001\u8f6c\u63a5\u5934\u3001\u6ce2\u5bfc\u8f6c\u6362\u5668\u7b49\u635f\u8017\u901a\u5e38\u66f4\u52a0\u660e\u663e\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5982\u679c\u63a5\u6536\u94fe\u8def\u662f\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">\u5587\u53ed\u5929\u7ebf \u2192 \u9988\u7ebf\/\u8f6c\u63a5\u5934 \u2192 \u9891\u8c31\u4eea\u5185\u7f6e\u9884\u653e<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u90a3\u4e48\u5f31\u4fe1\u53f7\u5728\u5230\u8fbe\u9891\u8c31\u4eea\u5185\u7f6e\u9884\u653e\u4e4b\u524d\uff0c \u5df2\u7ecf\u5148\u7ecf\u8fc7\u4e86\u4e00\u6bb5\u660e\u663e\u635f\u8017\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5047\u8bbe\u5929\u7ebf\u5230\u9891\u8c31\u4eea\u4e4b\u95f4\u7684\u635f\u8017\u4e3a\uff1a $$ L=3\\ \\mathrm{dB} $$<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd9 3 dB \u635f\u8017\u53d1\u751f\u5728\u7b2c\u4e00\u4e2a\u4f4e\u566a\u58f0\u6709\u6e90\u5668\u4ef6\u4e4b\u524d\uff0c \u4f1a\u76f4\u63a5\u6076\u5316\u7cfb\u7edf\u566a\u58f0\u6027\u80fd\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5982\u679c\u628a\u5916\u7f6e\u4f4e\u566a\u653e\u653e\u5728\u5587\u53ed\u5929\u7ebf\u540e\u9762\uff0c\u5219\u94fe\u8def\u53d8\u6210\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">\u5587\u53ed\u5929\u7ebf \u2192 \u5916\u7f6e\u4f4e\u566a\u653e \u2192 \u9988\u7ebf\/\u8f6c\u63a5\u5934 \u2192 \u9891\u8c31\u4eea<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u6837\uff0c\u5f31\u4fe1\u53f7\u5148\u88ab\u4f4e\u566a\u58f0\u653e\u5927\uff0c\u7136\u540e\u518d\u7ecf\u8fc7\u9988\u7ebf\uff0c \u540e\u9762\u7684\u9988\u7ebf\u635f\u8017\u548c\u9891\u8c31\u4eea\u81ea\u8eab\u566a\u58f0\u8d21\u732e\u90fd\u4f1a\u88ab\u524d\u7f6e\u589e\u76ca\u538b\u4f4e\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5982\u679c\u5916\u7f6e\u4f4e\u566a\u653e\u53c2\u6570\u4e3a\uff1a $$ G_{\\mathrm{LNA}}=40\\ \\mathrm{dB} $$ $$ NF_{\\mathrm{LNA}}=1.5\\ \\mathrm{dB} $$<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5219\u7cfb\u7edf\u566a\u58f0\u6027\u80fd\u901a\u5e38\u4f1a\u975e\u5e38\u63a5\u8fd1\u5916\u7f6e\u4f4e\u566a\u653e\u672c\u8eab\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\ud83d\udccc \u5b9e\u6218\u7406\u89e3\uff1a<\/strong>\u5728\u9ad8\u9891\u6bb5\uff0c\u635f\u8017\u5f80\u5f80\u66f4\u8d35\u3002\u8c01\u80fd\u628a\u7b2c\u4e00\u4e2a\u4f4e\u566a\u58f0\u653e\u5927\u5668\u653e\u5f97\u66f4\u9760\u524d\uff0c\u8c01\u5c31\u66f4\u5bb9\u6613\u628a\u7cfb\u7edf\u7075\u654f\u5ea6\u505a\u8d77\u6765\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\ud83d\udcd0 \u5341\u3001\u4ece\u7cfb\u7edf\u566a\u58f0\u7cfb\u6570\u89d2\u5ea6\u770b\uff0c\u4e3a\u4ec0\u4e48\u5916\u7f6e\u4f4e\u566a\u653e\u6709\u610f\u4e49\uff1f<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u7ea7\u8054\u7cfb\u7edf\u566a\u58f0\u56e0\u5b50\u53ef\u4ee5\u7528 Friis \u516c\u5f0f\u8868\u793a\uff1a $$ \\begin{aligned} F_{\\mathrm{sys}} &amp;=F_1+\\frac{F_2-1}{G_1} \\end{aligned} $$<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5176\u4e2d\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>F1<\/strong>\uff1a\u5916\u7f6e\u4f4e\u566a\u653e\u7684\u566a\u58f0\u56e0\u5b50<\/li>\n\n\n\n<li><strong>G1<\/strong>\uff1a\u5916\u7f6e\u4f4e\u566a\u653e\u7684\u7ebf\u6027\u589e\u76ca<\/li>\n\n\n\n<li><strong>F2<\/strong>\uff1a\u540e\u7ea7\u9891\u8c31\u4eea\u6216\u63a5\u6536\u673a\u7684\u566a\u58f0\u56e0\u5b50<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u4e2a\u516c\u5f0f\u91cc\u6700\u5173\u952e\u7684\u4e00\u9879\u662f\uff1a $$ \\frac{F_2-1}{G_1} $$<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5f53\u5916\u7f6e\u4f4e\u566a\u653e\u589e\u76ca\u8db3\u591f\u5927\u65f6\uff0c \u540e\u7ea7\u9891\u8c31\u4eea\u7684\u566a\u58f0\u8d21\u732e\u4f1a\u88ab\u660e\u663e\u538b\u4f4e\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4f8b\u5982\uff0c\u5047\u8bbe\u5916\u7f6e\u4f4e\u566a\u653e\u566a\u58f0\u7cfb\u6570\u4e3a 1 dB\uff0c \u9891\u8c31\u4eea\u540e\u7ea7\u566a\u58f0\u7cfb\u6570\u4e3a 25 dB\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u6362\u7b97\u4e3a\u7ebf\u6027\u503c\u7ea6\u4e3a\uff1a $$ F_1=1.26 $$ $$ F_2=316 $$<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5982\u679c\u5916\u7f6e\u4f4e\u566a\u653e\u589e\u76ca\u4e3a 20 dB\uff0c\u5373\u7ebf\u6027\u589e\u76ca\u4e3a 100\uff0c\u5219\uff1a $$ G_1=100 $$ $$ \\begin{aligned} F_{\\mathrm{sys}} &amp;=1.26+\\frac{316-1}{100} \\\\ &amp;=4.41 \\end{aligned} $$<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u6362\u7b97\u4e3a\u7cfb\u7edf\u566a\u58f0\u7cfb\u6570\u7ea6\u4e3a\uff1a $$ \\begin{aligned} NF_{\\mathrm{sys}} &amp;=10\\log_{10}(4.41) \\\\ &amp;\\approx 6.4\\ \\mathrm{dB} \\end{aligned} $$<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5982\u679c\u5916\u7f6e\u4f4e\u566a\u653e\u589e\u76ca\u4e3a 40 dB\uff0c\u5373\u7ebf\u6027\u589e\u76ca\u4e3a 10000\uff0c\u5219\uff1a $$ G_1=10000 $$ $$ \\begin{aligned} F_{\\mathrm{sys}} &amp;=1.26+\\frac{316-1}{10000} \\\\ &amp;\\approx 1.29 \\end{aligned} $$<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5bf9\u5e94\u7cfb\u7edf\u566a\u58f0\u7cfb\u6570\u7ea6\u4e3a\uff1a $$ \\begin{aligned} NF_{\\mathrm{sys}} &amp;=10\\log_{10}(1.29) \\\\ &amp;\\approx 1.1\\ \\mathrm{dB} \\end{aligned} $$<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u4e2a\u4f8b\u5b50\u8bf4\u660e\uff1a\u5916\u7f6e\u4f4e\u566a\u653e\u7684\u589e\u76ca\u786e\u5b9e\u5f88\u91cd\u8981\u3002 \u8db3\u591f\u7684\u524d\u7f6e\u589e\u76ca\u53ef\u4ee5\u628a\u540e\u7ea7\u9891\u8c31\u4eea\u7684\u566a\u58f0\u8d21\u732e\u538b\u4e0b\u53bb\uff0c \u4f7f\u7cfb\u7edf\u566a\u58f0\u6027\u80fd\u63a5\u8fd1\u5916\u7f6e\u4f4e\u566a\u653e\u672c\u8eab\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\ud83d\udd00 \u5341\u4e00\u3001\u5916\u7f6e\u4f4e\u566a\u653e\u548c\u9891\u8c31\u4eea\u5185\u7f6e\u9884\u653e\u80fd\u4e0d\u80fd\u540c\u65f6\u6253\u5f00\uff1f<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u53ef\u4ee5\uff0c\u4f46<strong>\u4e0d\u662f\u4efb\u4f55\u60c5\u51b5\u4e0b\u90fd\u6709\u5fc5\u8981<\/strong>\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5982\u679c\u5916\u7f6e\u4f4e\u566a\u653e\u5df2\u7ecf\u9760\u8fd1\u5929\u7ebf\u5b89\u88c5\uff0c\u5e76\u4e14\u589e\u76ca\u8db3\u591f\u5927\uff0c\u4f8b\u5982 30 dB \u5230 40 dB\uff0c \u90a3\u4e48\u540e\u7ea7\u9891\u8c31\u4eea\u81ea\u8eab\u566a\u58f0\u901a\u5e38\u5df2\u7ecf\u88ab\u524d\u7f6e\u589e\u76ca\u538b\u4f4e\u3002 \u8fd9\u65f6\u518d\u6253\u5f00\u9891\u8c31\u4eea\u5185\u7f6e\u9884\u653e\uff0c\u5bf9\u7cfb\u7edf\u566a\u58f0\u7cfb\u6570\u7684\u6539\u5584\u5f80\u5f80\u5df2\u7ecf\u5f88\u5c0f\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd8\u662f\u7528 Friis \u516c\u5f0f\u770b\uff1a $$ F_{\\mathrm{sys}}=F_1+\\frac{F_2-1}{G_1} $$<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5f53\u5916\u7f6e\u4f4e\u566a\u653e\u7684\u589e\u76ca\u5f88\u5927\u65f6\uff0c\u540e\u7ea7\u566a\u58f0\u9879\u5df2\u7ecf\u88ab\u9664\u5f97\u5f88\u5c0f\uff0c \u6240\u4ee5\u5185\u7f6e\u9884\u653e\u662f\u5426\u518d\u6253\u5f00\uff0c\u5bf9\u6574\u4f53\u7cfb\u7edf\u566a\u58f0\u7cfb\u6570\u7684\u5f71\u54cd\u5c31\u4e0d\u660e\u663e\u4e86\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4f46\u5728\u4e0b\u9762\u51e0\u79cd\u60c5\u51b5\u4e0b\uff0c\u540c\u65f6\u6253\u5f00\u4ecd\u7136\u53ef\u80fd\u6709\u610f\u4e49\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u2705 \u5916\u7f6e\u4f4e\u566a\u653e\u589e\u76ca\u4e0d\u591f\u5927\uff0c\u4f8b\u5982\u53ea\u6709 10 dB \u5230 15 dB\uff1b<\/li>\n\n\n\n<li>\u2705 \u5916\u7f6e\u4f4e\u566a\u653e\u5230\u9891\u8c31\u4eea\u4e4b\u95f4\u8fd8\u6709\u8f83\u957f\u9988\u7ebf\u635f\u8017\uff1b<\/li>\n\n\n\n<li>\u2705 \u9891\u8c31\u4eea\u81ea\u8eab\u5e95\u566a\u4ecd\u7136\u660e\u663e\u9650\u5236\u89c2\u6d4b\uff1b<\/li>\n\n\n\n<li>\u2705 \u73b0\u573a\u5f3a\u4fe1\u53f7\u4e0d\u591a\uff0c\u4e0d\u5bb9\u6613\u53d1\u751f\u8fc7\u8f7d\u548c\u4e92\u8c03\u3002<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\ud83d\udee0\ufe0f \u5b9e\u7528\u5224\u65ad\u65b9\u6cd5<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5148\u6253\u5f00\u5916\u7f6e\u4f4e\u566a\u653e\uff0c\u5173\u95ed\u9891\u8c31\u4eea\u5185\u7f6e\u9884\u653e\uff0c\u89c2\u5bdf\u5e95\u566a\u548c\u76ee\u6807\u4fe1\u53f7\uff1b \u7136\u540e\u518d\u6253\u5f00\u5185\u7f6e\u9884\u653e\u3002\u5982\u679c\u76ee\u6807\u4fe1\u53f7\u6ca1\u6709\u660e\u663e\u6539\u5584\uff0c \u53cd\u800c\u5e95\u566a\u3001\u6742\u6563\u6216\u5f02\u5e38\u4fe1\u53f7\u660e\u663e\u589e\u591a\uff0c \u8bf4\u660e\u5185\u7f6e\u9884\u653e\u6ca1\u6709\u5fc5\u8981\u6253\u5f00\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u56e0\u6b64\uff0c\u53ef\u4ee5\u7b80\u5355\u603b\u7ed3\u4e3a\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u5916\u7f6e\u589e\u76ca\u5f88\u9ad8\u65f6<\/strong>\uff1a\u901a\u5e38\u4f18\u5148\u5173\u95ed\u5185\u7f6e\u9884\u653e\uff1b<\/li>\n\n\n\n<li><strong>\u5916\u7f6e\u589e\u76ca\u4e0d\u591f\u65f6<\/strong>\uff1a\u53ef\u4ee5\u5c1d\u8bd5\u518d\u5f00\u5185\u7f6e\u9884\u653e\uff1b<\/li>\n\n\n\n<li><strong>\u5f3a\u4fe1\u53f7\u73af\u5883<\/strong>\uff1a\u5e94\u8c28\u614e\u540c\u65f6\u6253\u5f00\u4e24\u7ea7\u589e\u76ca\u3002<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u2696\ufe0f \u5341\u4e8c\u3001\u5916\u7f6e\u4f4e\u566a\u653e\u662f\u4e0d\u662f\u589e\u76ca\u8d8a\u5927\u8d8a\u597d\uff1f<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e0d\u662f\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5f53\u589e\u76ca\u4e0d\u591f\u65f6\uff0c\u9891\u8c31\u4eea\u81ea\u8eab\u566a\u58f0\u4ecd\u7136\u53ef\u80fd\u4e3b\u5bfc\u7cfb\u7edf\u5e95\u566a\uff0c \u5f31\u4fe1\u53f7\u770b\u4e0d\u89c1\uff1b \u4f46\u5f53\u589e\u76ca\u5df2\u7ecf\u8db3\u591f\u65f6\uff0c\u518d\u7ee7\u7eed\u589e\u5927\u589e\u76ca\uff0c \u5bf9\u7cfb\u7edf\u566a\u58f0\u7cfb\u6570\u7684\u6539\u5584\u4f1a\u8d8a\u6765\u8d8a\u5c0f\uff0c \u53cd\u800c\u5bb9\u6613\u5e26\u6765\u65b0\u7684\u95ee\u9898\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u4e9b\u95ee\u9898\u5305\u62ec\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u2757 \u5f3a\u4fe1\u53f7\u4e5f\u4f1a\u88ab\u4e00\u8d77\u653e\u5927\uff1b<\/li>\n\n\n\n<li>\u2757 \u5916\u7f6e\u4f4e\u566a\u653e\u6216\u9891\u8c31\u4eea\u524d\u7aef\u53ef\u80fd\u8fc7\u8f7d\uff1b<\/li>\n\n\n\n<li>\u2757 \u53ef\u80fd\u4ea7\u751f\u4e92\u8c03\u548c\u5047\u4fe1\u53f7\uff1b<\/li>\n\n\n\n<li>\u2757 \u7cfb\u7edf\u52a8\u6001\u8303\u56f4\u4e0b\u964d\uff1b<\/li>\n\n\n\n<li>\u2757 \u9891\u8c31\u6574\u4f53\u5e95\u566a\u5f02\u5e38\u62ac\u5347\u3002<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u4f8b\u5982\uff0c\u5982\u679c\u73b0\u573a\u6709\u4e00\u4e2a\u8f83\u5f3a\u4fe1\u53f7\uff1a $$ P_{\\mathrm{strong}}=-40\\ \\mathrm{dBm} $$<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u7ecf\u8fc7 40 dB \u5916\u7f6e\u4f4e\u566a\u653e\u540e\u53d8\u6210\uff1a $$ P_{\\mathrm{strong,out}}=-40+40=0\\ \\mathrm{dBm} $$<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u5df2\u7ecf\u53ef\u80fd\u8ba9\u4f4e\u566a\u653e\u6216\u9891\u8c31\u4eea\u524d\u7aef\u8fdb\u5165\u538b\u7f29\u72b6\u6001\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\ud83d\udcce \u6240\u4ee5\u6b63\u786e\u539f\u5219\u662f\uff1a<\/strong>\u4f4e\u566a\u58f0\u3001\u8db3\u591f\u589e\u76ca\u3001\u8db3\u591f\u7ebf\u6027\u5ea6\u3001\u4e0d\u8fc7\u8f7d\uff0c\u800c\u4e0d\u662f\u5355\u7eaf\u8ffd\u6c42\u201c\u5927\u589e\u76ca\u201d\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\ud83d\udee0\ufe0f \u5341\u4e09\u3001\u5b9e\u9645\u76d1\u6d4b\u4e2d\u600e\u4e48\u7528\u66f4\u7a33\u59a5\uff1f<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u5bf9\u4e8e Ku \u6ce2\u6bb5\u3001\u536b\u661f\u4fe1\u53f7\u3001\u8fdc\u8ddd\u79bb\u5fae\u5f31\u4fe1\u53f7\u7b49\u573a\u666f\uff0c\u63a8\u8350\u94fe\u8def\u4e3a\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">\u5929\u7ebf\n\u2193\n\u4f4e\u63d2\u635f\u5e26\u901a\u6ee4\u6ce2\u5668\uff08\u89c6\u5f3a\u4fe1\u53f7\u73af\u5883\u51b3\u5b9a\uff09\n\u2193\n\u5916\u7f6e\u4f4e\u566a\u58f0\u653e\u5927\u5668\n\u2193\n\u4f4e\u635f\u8017\u9988\u7ebf\n\u2193\n\u9891\u8c31\u4eea<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u5b9e\u9645\u4f7f\u7528\u65f6\uff0c\u53ef\u4ee5\u91cd\u70b9\u89c2\u5bdf\u4ee5\u4e0b\u51e0\u70b9\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\ud83d\udd0d \u63a5\u5165\u4f4e\u566a\u653e\u540e\uff0c\u5e95\u566a\u662f\u5426\u5408\u7406\u62ac\u5347\uff1b<\/li>\n\n\n\n<li>\ud83d\udd0d \u5f31\u4fe1\u53f7\u662f\u5426\u4ece\u5e95\u566a\u4e2d\u663e\u73b0\u51fa\u6765\uff1b<\/li>\n\n\n\n<li>\ud83d\udd0d \u662f\u5426\u51fa\u73b0\u5927\u91cf\u539f\u672c\u4e0d\u5b58\u5728\u7684\u5047\u4fe1\u53f7\uff1b<\/li>\n\n\n\n<li>\ud83d\udd0d \u589e\u52a0\u8f93\u5165\u8870\u51cf\u540e\uff0c\u7591\u4f3c\u4e92\u8c03\u4ea7\u7269\u662f\u5426\u6309\u89c4\u5f8b\u53d8\u5316\uff1b<\/li>\n\n\n\n<li>\ud83d\udd0d \u662f\u5426\u5b58\u5728\u524d\u7aef\u538b\u7f29\u6216\u9891\u8c31\u6574\u4f53\u5f02\u5e38\u62ac\u5347\u3002<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u5982\u679c\u63a5\u5165\u4f4e\u566a\u653e\u540e\uff0c\u5f31\u4fe1\u53f7\u66f4\u6e05\u695a\u4e86\uff0c\u540c\u65f6\u6ca1\u6709\u660e\u663e\u5047\u4fe1\u53f7\u548c\u8fc7\u8f7d\u8ff9\u8c61\uff0c \u8bf4\u660e\u4f4e\u566a\u653e\u7684\u589e\u76ca\u3001\u566a\u58f0\u7cfb\u6570\u548c\u7ebf\u6027\u5ea6\u6bd4\u8f83\u5408\u9002\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5982\u679c\u63a5\u5165\u540e\u9891\u8c31\u4e0a\u51fa\u73b0\u5927\u91cf\u5f02\u5e38\u4fe1\u53f7\u3001\u5e95\u566a\u5927\u5e45\u62ac\u5347\u3001\u5f3a\u4fe1\u53f7\u5468\u56f4\u51fa\u73b0\u4e92\u8c03\u4ea7\u7269\uff0c \u5219\u53ef\u80fd\u662f\u589e\u76ca\u8fc7\u9ad8\u3001\u524d\u7aef\u8fc7\u8f7d\uff0c\u6216\u8005\u7f3a\u5c11\u5fc5\u8981\u7684\u524d\u7f6e\u6ee4\u6ce2\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\ud83e\uddfe \u5341\u56db\u3001\u6700\u540e\u505a\u4e2a\u603b\u7ed3<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u5916\u7f6e\u4f4e\u566a\u653e\u548c\u9891\u8c31\u4eea\u5185\u7f6e\u9884\u653e\u7684\u6839\u672c\u533a\u522b\uff0c \u5728\u4e8e\u5b83\u4eec\u5728\u63a5\u6536\u94fe\u8def\u4e2d\u7684\u4f4d\u7f6e\u4e0d\u540c\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5185\u7f6e\u9884\u653e\u53ef\u4ee5\u6539\u5584\u9891\u8c31\u4eea\u81ea\u8eab\u5e95\u566a\uff0c \u4f46\u5b83\u4f4d\u4e8e\u9891\u8c31\u4eea\u5185\u90e8\uff0c \u65e0\u6cd5\u8865\u6551\u5929\u7ebf\u5230\u9891\u8c31\u4eea\u4e4b\u95f4\u5df2\u7ecf\u53d1\u751f\u7684\u9988\u7ebf\u635f\u8017\u548c\u8f6c\u63a5\u635f\u8017\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5916\u7f6e\u4f4e\u566a\u653e\u5982\u679c\u653e\u5728\u5929\u7ebf\u53e3\u9644\u8fd1\uff0c \u53ef\u4ee5\u5728\u5f31\u4fe1\u53f7\u88ab\u9988\u7ebf\u635f\u8017\u8870\u51cf\u4e4b\u524d\u5148\u8fdb\u884c\u4f4e\u566a\u58f0\u653e\u5927\uff0c \u4ece\u800c\u663e\u8457\u538b\u4f4e\u540e\u7ea7\u9988\u7ebf\u635f\u8017\u548c\u9891\u8c31\u4eea\u81ea\u8eab\u566a\u58f0\u7684\u5f71\u54cd\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u56e0\u6b64\uff0c\u5728\u9ad8\u9891\u6bb5\u3001\u957f\u9988\u7ebf\u3001\u5fae\u5f31\u4fe1\u53f7\u76d1\u6d4b\u573a\u666f\u4e0b\uff0c \u5916\u7f6e\u4f4e\u566a\u653e\u5f80\u5f80\u6bd4\u5355\u7eaf\u4f9d\u8d56\u9891\u8c31\u4eea\u5185\u7f6e\u9884\u653e\u66f4\u6709\u610f\u4e49\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4f46\u5916\u7f6e\u4f4e\u566a\u653e\u5e76\u4e0d\u80fd\u6539\u53d8\u4fe1\u53f7\u76f8\u5bf9\u4e8e\u5929\u7ebf\u7aef\u5916\u754c\u566a\u58f0\u7684\u672c\u8d28\u4fe1\u566a\u6bd4\u3002 \u5b83\u80fd\u89e3\u51b3\u7684\u662f\u63a5\u6536\u7cfb\u7edf\u81ea\u8eab\u4e0d\u591f\u7075\u654f\u7684\u95ee\u9898\uff0c \u800c\u4e0d\u80fd\u7a81\u7834\u70ed\u566a\u58f0\u548c\u73af\u5883\u566a\u58f0\u51b3\u5b9a\u7684\u7269\u7406\u9650\u5236\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5916\u7f6e\u4f4e\u566a\u653e\u548c\u9891\u8c31\u4eea\u5185\u7f6e\u9884\u653e\u53ef\u4ee5\u540c\u65f6\u6253\u5f00\uff0c \u4f46\u53ea\u6709\u5728\u5916\u7f6e\u4f4e\u566a\u653e\u589e\u76ca\u4e0d\u8db3\u3001\u540e\u7ea7\u635f\u8017\u8f83\u5927\u6216\u9891\u8c31\u4eea\u81ea\u8eab\u566a\u58f0\u4ecd\u7136\u9650\u5236\u89c2\u6d4b\u65f6\uff0c \u624d\u66f4\u6709\u660e\u663e\u610f\u4e49\u3002 \u5982\u679c\u5916\u7f6e\u4f4e\u566a\u653e\u5df2\u7ecf\u63d0\u4f9b\u8db3\u591f\u524d\u7f6e\u589e\u76ca\uff0c \u518d\u6253\u5f00\u5185\u7f6e\u9884\u653e\u901a\u5e38\u5e2e\u52a9\u6709\u9650\uff0c \u53cd\u800c\u53ef\u80fd\u589e\u52a0\u8fc7\u8f7d\u3001\u4e92\u8c03\u548c\u5047\u4fe1\u53f7\u98ce\u9669\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u2705 \u6700\u7ec8\u4e00\u53e5\u8bdd<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5916\u7f6e\u4f4e\u566a\u653e\u5bf9\u5fae\u5f31\u4fe1\u53f7\u76d1\u6d4b\u610f\u4e49\u91cd\u5927\uff0c\u4f46\u5b83\u4e0d\u662f\u7b80\u5355\u201c\u653e\u5927 40 dB \u5c31\u4e07\u4e8b\u5927\u5409\u201d\uff0c \u800c\u662f\u901a\u8fc7\u524d\u7f6e\u4f4e\u566a\u58f0\u589e\u76ca\uff0c\u8ba9\u6574\u4e2a\u63a5\u6536\u7cfb\u7edf\u7684\u7075\u654f\u5ea6\u5c3d\u91cf\u7531\u5929\u7ebf\u7aef\u548c\u4f4e\u566a\u653e\u672c\u8eab\u51b3\u5b9a\uff0c \u800c\u4e0d\u662f\u7531\u9988\u7ebf\u635f\u8017\u548c\u9891\u8c31\u4eea\u81ea\u8eab\u5e95\u566a\u51b3\u5b9a\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\ud83d\udccc \u6838\u5fc3\u7ed3\u8bba \u5916\u7f6e\u4f4e\u566a\u653e\u7684\u610f\u4e49\uff0c\u4e0d\u53ea\u662f\u201c\u628a\u4fe1\u53f7\u653e\u5927\u4e86\u591a\u5c11 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