\u5728\u65e0\u7ebf\u7f51\u6865\u89c6\u9891\u4f20\u8f93\u7cfb\u7edf\u4e2d\uff0c\u65e0\u7ebf\u7f51\u6865\u7684\u4f20\u8f93\u8ddd\u79bb\u8ddf\u65e0\u7ebf\u7f51\u6865\u7684\u53d1\u5c04\u529f\u7387\u548c\u9891\u7387\u53ca\u5929\u7ebf\u589e\u76ca\u6709\u7740\u5f88\u5927\u7684\u8054\u7cfb\u3002\u8fd9\u4e00\u8282\u6211\u4eec\u6765\u4ecb\u7ecd\u4e00\u4e0b\u65e0\u7ebf\u7f51\u6865\u4f20\u8f93\u8ddd\u79bb\u3001\u53d1\u5c04\u529f\u7387\u3001\u63a5\u6536\u7075\u654f\u5ea6\u548c\u5de5\u4f5c\u9891\u7387\u7684\u5173\u7cfb\uff1a<\/p>\n
[Lfs](dB)=32.44+20lgd(km)+20lgf(MHz)<\/p>\n
\u5f0f\u4e2dLfs\u4e3a\u4f20\u8f93\u635f\u8017\uff0cd\u4e3a\u4f20\u8f93\u8ddd\u79bb\uff0c\u9891\u7387\u7684\u5355\u4f4d\u4ee5MHz\u8ba1\u7b97\u3002<\/p>\n
\u7531\u4e0a\u5f0f\u53ef\u89c1\uff0c\u81ea\u7531\u7a7a\u95f4\u4e2d\u7535\u6ce2\u4f20\u64ad\u635f\u8017(\u4ea6\u79f0\u8870\u51cf)\u53ea\u4e0e\u5de5\u4f5c\u9891\u7387f\u548c\u4f20\u64ad\u8ddd\u79bbd\u6709\u5173\uff0c\u5f53f\u6216d\u589e\u5927\u4e00\u500d\u65f6\uff0c[Lfs]\u5c06\u5206\u522b\u589e\u52a06dB.<\/p>\n
\u4e0b\u9762\u7684\u516c\u5f0f\u8bf4\u660e\u5728\u81ea\u7531\u7a7a\u95f4\u4e0b\u7535\u6ce2\u4f20\u64ad\u7684\u635f\u8017<\/p>\n
Los = 32.44 + 20lg d(Km) + 20lg f(MHz)<\/p>\n
Los \u662f\u4f20\u64ad\u635f\u8017\uff0c\u5355\u4f4d\u4e3adB<\/p>\n
d\u662f\u8ddd\u79bb\uff0c\u5355\u4f4d\u662fKm<\/p>\n
f\u662f\u5de5\u4f5c\u9891\u7387\uff0c\u5355\u4f4d\u662fMHz<\/p>\n
\u4e0b\u9762\u4e3e\u4f8b\u8bf4\u660e\u4e00\u4e2a\u5de5\u4f5c\u9891\u7387\u4e3a433.92MHz\uff0c\u53d1\u5c04\u529f\u7387\u4e3a+10dBm(10mW)\uff0c\u63a5\u6536\u7075\u654f\u5ea6\u4e3a-105dBm\u7684\u7cfb\u7edf\u5728\u81ea\u7531\u7a7a\u95f4\u7684\u4f20\u64ad\u8ddd\u79bb\uff1a<\/p>\n
1. \u7531\u53d1\u5c04\u529f\u7387+10dBm\uff0c\u63a5\u6536\u7075\u654f\u5ea6\u4e3a-105dBm<\/p>\n
Los = 115dB<\/p>\n
2. \u7531Los\u3001f<\/p>\n
\u8ba1\u7b97\u5f97\u51fad =30\u516c\u91cc<\/p>\n
\u8fd9\u662f\u7406\u60f3\u72b6\u51b5\u4e0b\u7684\u4f20\u8f93\u8ddd\u79bb\uff0c\u5b9e\u9645\u7684\u5e94\u7528\u4e2d\u662f\u4f1a\u4f4e\u4e8e\u8be5\u503c\uff0c\u8fd9\u662f\u56e0\u4e3a\u65e0\u7ebf\u901a\u4fe1\u8981\u53d7\u5230\u5404\u79cd\u5916\u754c\u56e0\u7d20\u7684\u5f71\u54cd\uff0c\u5982\u5927\u6c14\u3001\u963b\u6321\u7269\u3001\u591a\u5f84\u7b49\u9020\u6210\u7684\u635f\u8017\uff0c\u5c06\u4e0a\u8ff0\u635f\u8017\u7684\u53c2\u8003\u503c\u8ba1\u5165\u4e0a\u5f0f\u4e2d\uff0c\u5373\u53ef\u8ba1\u7b97\u51fa\u8fd1\u4f3c\u901a\u4fe1\u8ddd\u79bb\u3002<\/p>\n
\u5047\u5b9a\u5927\u6c14\u3001\u906e\u6321\u7b49\u9020\u6210\u7684\u635f\u8017\u4e3a25dB\uff0c\u53ef\u4ee5\u8ba1\u7b97\u5f97\u51fa\u901a\u4fe1\u8ddd\u79bb\u4e3a\uff1a<\/p>\n
d =1.7\u516c\u91cc<\/p>\n
\u7ed3\u8bba: \u65e0\u7ebf\u4f20\u8f93\u635f\u8017\u6bcf\u589e\u52a06dB, \u4f20\u9001\u8ddd\u79bb\u51cf\u5c0f\u4e00\u500d<\/p>\n
\u53ef\u89c1\u5f71\u54cd\u65e0\u7ebf\u7f51\u6865\u4f20\u8f93\u8ddd\u79bb\u7684\u51e0\u4e2a\u6700\u4e3b\u8981\u7684\u56e0\u7d20\u662f\uff1a\u53d1\u5c04\u529f\u7387\u3001\u5929\u7ebf\u589e\u76ca\u3001\u5de5\u4f5c\u9891\u7387\u4ee5\u53ca\u73b0\u573a\u73af\u5883\u662f\u5426\u6709\u906e\u6321\u7b49\u3002<\/p>\n
<\/p>\n
\u529f\u7387\u7684\u5927\u5c0f\u4e0e\u4f20\u8f93\u8ddd\u79bb\u6709\u5173\uff0c\u8f83\u8fd1\u7684\u8ddd\u79bb\uff0c\u5f88\u9ad8\u7684\u529f\u7387\u53cd\u800c\u4f1a\u5f71\u54cd\u4f20\u8f93\u7684\u6548\u679c\u3002<\/p>\n
\u6839\u636e\u8ddd\u79bb\u9009\u62e9\u5408\u9002\u7684\u53d1\u5c04\u529f\u7387\uff0c\u8fd8\u9700\u8981\u6839\u636e\u5468\u56f4\u73af\u5883\u9009\u62e9\u5408\u9002\u7684\u9891\u7387\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u5728\u65e0\u7ebf\u7f51\u6865\u89c6\u9891\u4f20\u8f93\u7cfb\u7edf\u4e2d\uff0c\u65e0\u7ebf\u7f51\u6865\u7684\u4f20\u8f93\u8ddd\u79bb\u8ddf\u65e0\u7ebf\u7f51\u6865\u7684\u53d1\u5c04\u529f\u7387\u548c\u9891\u7387\u53ca\u5929\u7ebf\u589e\u76ca … \u7ee7\u7eed\u9605\u8bfb