\u3000\u3000\u5728LoRa\u901a\u4fe1\u7cfb\u7edf\u4e2d\uff0cRSSI(Received Signal Strength Indicator\uff0c\u63a5\u6536\u4fe1\u53f7\u5f3a\u5ea6\u6307\u793a)\u662f\u4e00\u4e2a\u975e\u5e38\u91cd\u8981\u7684\u6307\u6807\uff0c\u5b83\u8868\u793a\u63a5\u6536\u5230\u4fe1\u53f7\u7684\u5f3a\u5ea6\u3002RSSI\u503c\u53ef\u4ee5\u5e2e\u52a9\u6211\u4eec\u8bc4\u4f30\u65e0\u7ebf\u4fe1\u53f7\u7684\u8d28\u91cf\uff0c\u4ee5\u53ca\u5728\u65e0\u7ebf\u901a\u4fe1\u4e2d\u6570\u636e\u4f20\u8f93\u7684\u53ef\u80fd\u6027\u548c\u53ef\u9760\u6027\u3002<\/p>\n\n\n\n
\u3000\u3000LoRa\u901a\u4fe1\u4e2d\u7684RSSI\u503c\u901a\u5e38\u4ee5dBm(\u5206\u8d1d\u6beb\u74e6)\u4e3a\u5355\u4f4d\uff0c\u8868\u793a\u63a5\u6536\u5230\u7684\u65e0\u7ebf\u4fe1\u53f7\u7684\u5f3a\u5ea6\u3002LoRa\u8bbe\u5907\u4f1a\u6839\u636eRSSI\u503c\u6765\u5224\u65ad\u4fe1\u53f7\u8d28\u91cf\uff0c\u4ee5\u51b3\u5b9a\u662f\u5426\u7ee7\u7eed\u53d1\u9001\u6570\u636e\u6216\u8005\u662f\u5426\u8fdb\u884c\u6570\u636e\u91cd\u53d1\u3002\u6839\u636eRSSI\u7684\u503c\uff0c\u6211\u4eec\u53ef\u4ee5\u5224\u65ad\u8bbe\u5907\u4e0e\u7f51\u5173\u6216\u5176\u4ed6\u8bbe\u5907\u4e4b\u95f4\u7684\u901a\u4fe1\u8ddd\u79bb\u4ee5\u53ca\u4fe1\u53f7\u8870\u51cf\u60c5\u51b5\u3002<\/p>\n\n\n\n
\u3000\u3000\u4e00\u822c\u60c5\u51b5\u4e0b\uff0cRSSI\u7684\u503c\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n\n\n\n
\u3000\u3000\u5177\u4f53\u5230LoRa\uff0c\u4f55\u65f6\u80fd\u591f\u53d1\u9001\u6570\u636e?<\/p>\n\n\n\n
\u3000\u3000LoRa\u6280\u672f\u7684\u7279\u70b9\u4e4b\u4e00\u662f\u5b83\u5728\u4f4e\u4fe1\u53f7\u5f3a\u5ea6\u4e0b\u4ecd\u80fd\u7a33\u5b9a\u4f20\u8f93\u6570\u636e\uff0c\u7279\u522b\u662f\u5728\u957f\u8ddd\u79bb(\u5982\u51e0\u516c\u91cc)\u548c\u4f4e\u529f\u8017\u7684\u573a\u666f\u4e0b\u3002LoRa\u91c7\u7528\u7684\u8c03\u5236\u6280\u672f(\u5982Chirp Spread Spectrum\uff0cCSS)\u4f7f\u5f97\u5b83\u80fd\u591f\u5728\u8f83\u4f4e\u7684RSSI\u503c\u4e0b\u4ecd\u7136\u4fdd\u6301\u8f83\u5f3a\u7684\u6297\u5e72\u6270\u80fd\u529b\u3002\u7136\u800c\uff0c\u5b9e\u9645\u4e2d\u53d1\u9001\u6570\u636e\u7684\u53ef\u884c\u6027\u8fd8\u53d7\u5230\u5176\u4ed6\u591a\u4e2a\u56e0\u7d20\u7684\u5f71\u54cd\uff0c\u5305\u62ec\uff1a<\/p>\n\n\n\n
\u3000\u3000LoRa\u8bbe\u5907\u7684RSSI\u503c\u4e00\u822c\u4f1a\u5728-100 dBm\u5de6\u53f3\u65f6\u4ecd\u80fd\u53d1\u9001\u6570\u636e\uff0c\u4f46\u8fd9\u65f6\u6570\u636e\u4f20\u8f93\u7684\u53ef\u9760\u6027\u4f1a\u5927\u6253\u6298\u6263\uff0c\u53ef\u80fd\u9700\u8981\u91cd\u4f20\u6216\u589e\u52a0\u5197\u4f59\u4fe1\u606f\u4ee5\u786e\u4fdd\u6570\u636e\u6210\u529f\u5230\u8fbe\u76ee\u6807\u3002\u5982\u679cRSSI\u4f4e\u4e8e-110 dBm\uff0cLoRa\u7cfb\u7edf\u7684\u901a\u4fe1\u80fd\u529b\u4f1a\u5927\u5927\u4e0b\u964d\uff0c\u51e0\u4e4e\u65e0\u6cd5\u4fdd\u8bc1\u7a33\u5b9a\u7684\u6570\u636e\u4f20\u8f93\u3002<\/p>\n\n\n\n
\u3000\u3000\u5b9e\u9645\u4e0a\uff0cLoRa\u901a\u4fe1\u7cfb\u7edf\u662f\u8bbe\u8ba1\u4e3a\u80fd\u591f\u5728\u8fdc\u8ddd\u79bb\u3001\u4f4e\u4fe1\u53f7\u73af\u5883\u4e2d\u5de5\u4f5c\u7684\uff0c\u5b83\u7684\u6297\u5e72\u6270\u6027\u5f88\u5f3a\u3002\u5373\u4f7fRSSI\u503c\u8f83\u4f4e\uff0c\u8bbe\u5907\u4ecd\u7136\u53ef\u4ee5\u5c1d\u8bd5\u53d1\u9001\u6570\u636e\uff0c\u4f46\u968f\u7740RSSI\u503c\u7684\u964d\u4f4e\uff0c\u4f20\u8f93\u7684\u7a33\u5b9a\u6027\u548c\u901f\u7387\u4f1a\u53d7\u5230\u8d8a\u6765\u8d8a\u5927\u7684\u5f71\u54cd\u3002\u56e0\u6b64\uff0c\u9009\u62e9\u9002\u5408\u7684\u6269\u9891\u56e0\u5b50(SF)\u3001\u9002\u5f53\u7684\u4f20\u8f93\u529f\u7387\u3001\u4ee5\u53ca\u5728\u5408\u9002\u7684\u73af\u5883\u4e2d\u4f7f\u7528LoRa\u8bbe\u5907\uff0c\u90fd\u4f1a\u76f4\u63a5\u5f71\u54cdRSSI\u548c\u6570\u636e\u53d1\u9001\u7684\u6210\u529f\u7387\u3002<\/p>\n\n\n\n
\u3000\u3000\u867d\u7136LoRa\u8bbe\u5907\u53ef\u4ee5\u5728\u8f83\u4f4e\u7684RSSI\u503c\u4e0b\u53d1\u9001\u6570\u636e\uff0c\u5b9e\u9645\u7684\u53ef\u884c\u6027\u53d6\u51b3\u4e8e\u591a\u79cd\u56e0\u7d20\uff0c\u5305\u62ec\u4fe1\u53f7\u5f3a\u5ea6\u3001\u566a\u58f0\u73af\u5883\u3001\u4f7f\u7528\u7684\u6269\u9891\u56e0\u5b50\u548c\u4f20\u8f93\u529f\u7387\u7b49\u3002\u5728\u5b9e\u9645\u5e94\u7528\u4e2d\uff0cLoRa\u901a\u5e38\u80fd\u5728-110 dBm\u5de6\u53f3\u7684RSSI\u503c\u4e0b\u8fdb\u884c\u901a\u4fe1\uff0c\u4f46\u4e3a\u4e86\u786e\u4fdd\u6570\u636e\u4f20\u8f93\u7684\u7a33\u5b9a\u6027\uff0cRSSI\u6700\u597d\u4fdd\u6301\u5728-80 dBm\u4ee5\u4e0a\u3002\u5982\u679cRSSI\u4f4e\u4e8e-110 dBm\uff0c\u901a\u4fe1\u8d28\u91cf\u53ef\u80fd\u4f1a\u53d7\u5230\u5f88\u5927\u5f71\u54cd\uff0c\u751a\u81f3\u65e0\u6cd5\u53ef\u9760\u4f20\u8f93\u6570\u636e\u3002<\/p>\n\n\n\n
\u3000\u3000\u5728LoRa\u6280\u672f\u4e2d\uff0cRSSI(\u63a5\u6536\u4fe1\u53f7\u5f3a\u5ea6\u6307\u793a)\u503c\u5bf9\u6570\u636e\u4f20\u8f93\u7684\u53ef\u9760\u6027\u5177\u6709\u663e\u8457\u5f71\u54cd\u3002RSSI\u503c\u53cd\u6620\u4e86\u63a5\u6536\u5668\u63a5\u6536\u5230\u7684\u4fe1\u53f7\u5f3a\u5ea6\uff0c\u901a\u5e38\u4ee5dBm\u4e3a\u5355\u4f4d\u8868\u793a\u3002RSSI\u503c\u8d8a\u63a5\u8fd10 dBm\uff0c\u8868\u793a\u4fe1\u53f7\u5f3a\u5ea6\u8d8a\u9ad8\uff0c\u6570\u636e\u4f20\u8f93\u7684\u53ef\u9760\u6027\u4e5f\u8d8a\u9ad8;\u53cd\u4e4b\uff0cRSSI\u503c\u8d8a\u4f4e\uff0c\u4fe1\u53f7\u5f3a\u5ea6\u8d8a\u5f31\uff0c\u6570\u636e\u4f20\u8f93\u7684\u53ef\u9760\u6027\u964d\u4f4e\u3002<\/p>\n\n\n\n
\u3000\u3000\u6839\u636e\u591a\u9879\u7814\u7a76\u548c\u5b9e\u9a8c\u7ed3\u679c\uff0c\u4ee5\u4e0b\u662fRSSI\u503c\u5bf9LoRa\u6570\u636e\u4f20\u8f93\u53ef\u9760\u6027\u7684\u5177\u4f53\u5f71\u54cd\uff1a<\/p>\n\n\n\n
\u3000\u3000\u5728LoRa\u901a\u4fe1\u4e2d\uff0cRSSI\u503c\u968f\u7740\u53d1\u9001\u5668\u4e0e\u63a5\u6536\u5668\u4e4b\u95f4\u7684\u8ddd\u79bb\u589e\u52a0\u800c\u9010\u6e10\u51cf\u5c0f\u3002\u4f8b\u5982\uff0c\u5728\u4e00\u4e2a\u6d4b\u8bd5\u4e2d\uff0c\u5f53\u8282\u70b9\u95f4\u8ddd\u79bb\u4e3a100\u7c73\u65f6\uff0cRSSI\u503c\u4e3a-62 dBm\uff0c\u800c\u5f53\u8ddd\u79bb\u589e\u52a0\u5230200\u7c73\u65f6\uff0cRSSI\u503c\u964d\u81f3-72 dBm\uff0c\u76f4\u5230\u6700\u5927\u4f20\u8f93\u8ddd\u79bb1500\u7c73\u65f6\uff0cRSSI\u503c\u964d\u81f3-122 dBm\u3002\u8fd9\u8868\u660e\u4fe1\u53f7\u5f3a\u5ea6\u968f\u8ddd\u79bb\u589e\u52a0\u800c\u51cf\u5f31\uff0c\u4ece\u800c\u5f71\u54cd\u6570\u636e\u4f20\u8f93\u7684\u53ef\u9760\u6027\u3002<\/p>\n\n\n\n
\u3000\u3000SNR\u662f\u8bc4\u4f30\u4fe1\u53f7\u8d28\u91cf\u7684\u91cd\u8981\u6307\u6807\uff0c\u901a\u5e38\u5728-20 dB\u5230+10 dB\u4e4b\u95f4\u3002\u5f53SNR\u4f4e\u4e8e0 dB\u65f6\uff0c\u9700\u8981\u786e\u8ba4\u6570\u636e\u5305\u4ea4\u4ed8\u4ee5\u786e\u4fdd\u53ef\u9760\u4f20\u8f93\u3002\u4f8b\u5982\uff0c\u5728\u4e00\u4e2a\u5b9e\u9a8c\u4e2d\uff0c\u5f53RSSI\u503c\u5728-120 dBm\u5230-110 dBm\u4e4b\u95f4\u65f6\uff0c\u6570\u636e\u5305\u4ea4\u4ed8\u786e\u8ba4\u7684\u53ef\u80fd\u6027\u8f83\u9ad8;\u800c\u5f53RSSI\u503c\u4f4e\u4e8e-120 dBm\u65f6\uff0c\u6570\u636e\u5305\u4e22\u5931\u7684\u53ef\u80fd\u6027\u589e\u52a0\uff0c\u786e\u8ba4\u4ea4\u4ed8\u53d8\u5f97\u5fc5\u8981\u3002<\/p>\n\n\n\n
\u3000\u3000\u6269\u5c55\u56e0\u5b50\u548c\u5e26\u5bbd\u4e5f\u4f1a\u5f71\u54cdRSSI\u503c\u548c\u6570\u636e\u4f20\u8f93\u7684\u53ef\u9760\u6027\u3002\u589e\u52a0\u6269\u5c55\u56e0\u5b50\u4f1a\u964d\u4f4e\u5e73\u5747RSSI\u503c\uff0c\u63d0\u9ad8\u4fe1\u53f7\u7a33\u5b9a\u6027\u548c\u5f3a\u5ea6\u3002\u4f8b\u5982\uff0c\u5728\u4fdd\u6301125 kHz\u5e26\u5bbd\u7684\u60c5\u51b5\u4e0b\uff0c\u6269\u5c55\u56e0\u5b50\u4ece7\u589e\u52a0\u523012\u65f6\uff0cRSSI\u503c\u4f1a\u964d\u4f4e\u3002\u540c\u65f6\uff0c\u8f83\u4f4e\u5e26\u5bbd(125 kHz)\u901a\u5e38\u6bd4\u8f83\u9ad8\u5e26\u5bbd(250 kHz)\u83b7\u5f97\u66f4\u4f73\u7684RSSI\u503c\u3002<\/p>\n\n\n\n
\u3000\u3000RSSI\u503c\u8fd8\u53d7\u5230\u73af\u5883\u56e0\u7d20\u7684\u5f71\u54cd\uff0c\u5982\u5efa\u7b51\u7269\u3001\u6811\u6728\u548c\u5176\u4ed6\u969c\u788d\u7269\u7684\u5b58\u5728\u3002\u4f8b\u5982\uff0c\u5728\u5927\u5b66\u6821\u56ed\u5185\u8fdb\u884c\u7684\u6d4b\u8bd5\u4e2d\uff0c\u8bbe\u5907\u5728\u4e0d\u540c\u4f4d\u7f6e\u7684RSSI\u503c\u663e\u8457\u4e0d\u540c\uff0c\u8ddd\u79bb\u7f51\u5173\u8d8a\u8fdc\uff0cRSSI\u503c\u8d8a\u4f4e\u3002\u6b64\u5916\uff0c\u8239\u8236\u4e0a\u7684\u673a\u68b0\u7a7a\u95f4\u5bf9\u6d4b\u91cf\u7ed3\u679c\u6709\u660e\u663e\u5f71\u54cd\uff0c\u7279\u522b\u662f\u5728\u907f\u96be\u7532\u677f\u4e0a\u7684\u673a\u68b0\u7a7a\u95f4\u5185\uff0c\u4fe1\u53f7\u5f3a\u5ea6\u663e\u8457\u589e\u5f3a\u3002<\/p>\n\n\n\n
\u3000\u3000RSSI\u6d4b\u91cf\u503c\u53ef\u80fd\u4e0e\u5b9e\u9645\u63a5\u6536\u529f\u7387\u5b58\u5728\u5dee\u5f02\uff0c\u56e0\u6b64\u9700\u8981\u8fdb\u884c\u6821\u51c6\u4ee5\u63d0\u9ad8\u51c6\u786e\u6027\u3002\u4f8b\u5982\uff0c\u5728\u4e00\u4e2a\u5b9e\u9a8c\u4e2d\uff0cRSSI\u6d4b\u91cf\u503c\u666e\u904d\u4f4e\u4e8e\u5b9e\u9645\u63a5\u6536\u529f\u7387\uff0c\u7279\u522b\u662f\u5728\u9ad8SF\u503c\u4e0b\u3002\u6821\u51c6\u53ef\u4ee5\u51cf\u5c11\u8fd9\u79cd\u5dee\u5f02\uff0c\u4ece\u800c\u63d0\u9ad8\u8def\u5f84\u635f\u8017\u4f30\u8ba1\u7684\u51c6\u786e\u6027\u3002<\/p>\n\n\n\n
\u3000\u3000RSSI\u503c\u662f\u8bc4\u4f30LoRa\u6570\u636e\u4f20\u8f93\u53ef\u9760\u6027\u7684\u5173\u952e\u53c2\u6570\u3002\u8f83\u9ad8\u7684RSSI\u503c\u901a\u5e38\u610f\u5473\u7740\u8f83\u5f3a\u7684\u4fe1\u53f7\u5f3a\u5ea6\u548c\u8f83\u9ad8\u7684\u6570\u636e\u4f20\u8f93\u53ef\u9760\u6027;\u800c\u8f83\u4f4e\u7684RSSI\u503c\u5219\u53ef\u80fd\u5bfc\u81f4\u4fe1\u53f7\u5f3a\u5ea6\u51cf\u5f31\u548c\u6570\u636e\u4f20\u8f93\u4e0d\u53ef\u9760\u3002<\/p>\n\n\n\n
\u3000\u3000\u4e0d\u540c\u73af\u5883\u4e0bLoRa\u8bbe\u5907\u7684RSSI\u9608\u503c\u4f1a\u53d7\u5230\u591a\u79cd\u56e0\u7d20\u7684\u5f71\u54cd\uff0c\u5305\u62ec\u8ddd\u79bb\u3001\u969c\u788d\u7269\u3001\u73af\u5883\u7c7b\u578b(\u5982\u5ba4\u5185\u6216\u5ba4\u5916)\u3001\u4ee5\u53ca\u8bbe\u5907\u95f4\u7684\u5e72\u6270\u7b49\u3002\u4ee5\u4e0b\u662f\u57fa\u4e8e\u6211\u641c\u7d22\u5230\u7684\u8d44\u6599\u5bf9\u8fd9\u4e9b\u56e0\u7d20\u5f71\u54cd\u7684\u8be6\u7ec6\u5206\u6790\uff1a<\/p>\n\n\n\n
\u3000\u3000\u5728\u5f00\u9614\u73af\u5883\u4e2d\uff0c\u5f53\u4f20\u8f93\u8ddd\u79bb\u4ece0\u7c73\u589e\u52a0\u523025\u7c73\u65f6\uff0cRSSI\u503c\u4ece-24 dBm\u9010\u6e10\u4e0b\u964d\u5230-60 dBm;\u5f53\u4f20\u8f93\u8ddd\u79bb\u8fbe\u5230170\u7c73\u65f6\uff0cRSSI\u503c\u8fdb\u4e00\u6b65\u4e0b\u964d\u5230-100 dBm\u3002<\/p>\n\n\n\n
\u3000\u3000\u5728\u57ce\u5e02\u73af\u5883\u4e2d\uff0c\u968f\u7740\u8ddd\u79bb\u7684\u589e\u52a0\uff0cRSSI\u503c\u663e\u8457\u4e0b\u964d\u3002\u4f8b\u5982\uff0c\u5728300\u7c73\u5904\uff0c\u4fe1\u53f7\u8d28\u91cf\u6025\u5267\u4e0b\u964d\uff0c\u5bf9\u51c6\u5929\u7ebf\u7684\u524d\u5411\u8def\u5f84\u635f\u8017\u6bd4(PRR)\u964d\u81f332%\uff0c\u975e\u5bf9\u51c6\u5929\u7ebf\u65f6\u751a\u81f3\u65e0\u6cd5\u8bfb\u53d6\u4efb\u4f55\u6570\u636e\u5305\u3002<\/p>\n\n\n\n
\u3000\u3000\u5728\u5ba4\u5185\u73af\u5883\u4e2d\uff0cRSSI\u503c\u4f1a\u56e0\u969c\u788d\u7269\u7684\u5b58\u5728\u800c\u663e\u8457\u964d\u4f4e\u3002\u4f8b\u5982\uff0c\u572810\u7c73\u65e0\u969c\u788d\u7269\u7684\u60c5\u51b5\u4e0b\uff0cRSSI\u503c\u53d7\u5e72\u6270\u5f71\u54cd\uff0c\u8303\u56f4\u4ece\u7ea6-20 dBm\u5230-40 dBm;\u5f53\u73bb\u7483\u95e8\u906e\u6321\u8ddd\u79bb\u589e\u52a0\u523020\u7c73\u65f6\uff0cRSSI\u503c\u964d\u81f3\u7ea6-60 dBm\u3002<\/p>\n\n\n\n
\u3000\u3000\u5728\u5bc6\u96c6\u68ee\u6797\u4e2d\uff0c\u4fe1\u53f7\u566a\u58f0\u6bd4(SNR)\u5728300\u7c73\u540e\u5f00\u59cb\u4e0b\u964d\uff0c\u5bf9\u51c6\u5929\u7ebf\u5728400\u7c73\u5904\u8fbe\u5230\u8d1f\u503c\uff0c\u975e\u5bf9\u51c6\u5929\u7ebf\u5728500\u7c73\u5904\u8fbe\u5230\u8d1f\u503c\u3002<\/p>\n\n\n\n
\u3000\u3000\u5ba4\u5185\u73af\u5883\u4e2d\u7684RSSI\u6807\u51c6\u504f\u5dee\u8f83\u5927\uff0c\u901a\u5e38\u4e3a8.2 dB\u548c11.9 dB\uff0c\u800c\u5ba4\u5916\u73af\u5883\u4e2d\u7684\u6807\u51c6\u504f\u5dee\u8f83\u5c0f\uff0c\u901a\u5e38\u4e3a6.5 dB\u3002\u8fd9\u8868\u660e\u5ba4\u5185\u73af\u5883\u4e2d\u7684\u4fe1\u53f7\u8870\u51cf\u66f4\u4e3a\u590d\u6742\uff0c\u53d7\u66f4\u591a\u969c\u788d\u7269\u7684\u5f71\u54cd\u3002<\/p>\n\n\n\n
\u3000\u3000\u5728\u4e18\u9675\u5730\u5f62\u4e0a\uff0cLoRa\u8bbe\u5907\u5b9e\u73b0\u4e86\u51e0\u4e4e\u6bcf\u4e2a\u70b9\u7684\u5168\u94fe\u8def\u8986\u76d6\uff0c\u6700\u5927\u8986\u76d6\u8ddd\u79bb\u8d85\u8fc71.5\u516c\u91cc;\u800c\u5728\u5bc6\u96c6\u57ce\u5e02\u73af\u5883\u4e2d\uff0c\u6700\u5927\u8986\u76d6\u8ddd\u79bb\u4e3a2.5\u516c\u91cc\u3002<\/p>\n\n\n\n
\u3000\u3000\u5728\u667a\u80fd\u5b9e\u9a8c\u5ba4\u76d1\u63a7\u7cfb\u7edf\u4e2d\uff0c\u4e0d\u540c\u623f\u95f4\u7684\u8bbe\u5907\u57282\u697c\u7684RSSI\u503c\u6bd4\u540c\u4e00\u623f\u95f4\u7684\u8bbe\u5907\u9ad8\uff0c\u8fd9\u4e3b\u8981\u662f\u7531\u4e8e\u4e0d\u540c\u623f\u95f4\u6761\u4ef6\u7684\u5e72\u6270\uff0c\u5982\u9694\u5899\u7b49\u3002<\/p>\n\n\n\n
\u3000\u3000\u5728\u591a\u8282\u70b9LoRa\u7f51\u7edc\u4e2d\uff0cTDMA\u548cCSMA\u7b97\u6cd5\u5bf9RSSI\u503c\u6709\u663e\u8457\u5f71\u54cd\u3002CSMA\u7b97\u6cd5\u6bd4TDMA\u7b97\u6cd5\u66f4\u5bb9\u6613\u53d1\u751f\u78b0\u649e\uff0c\u4ece\u800c\u5f71\u54cdRSSI\u503c\u3002<\/p>\n\n\n\n
\u3000\u3000\u5728\u81ea\u7531\u7a7a\u95f4\u8def\u5f84\u635f\u8017\u6761\u4ef6\u4e0b\uff0c915 MHz\u9891\u7387\u7684LoRa\u6a21\u5757\u57281\u81f35000\u7c73\u7684\u8ddd\u79bb\u5185\uff0c\u529f\u7387\u63a5\u6536\u5668\u7684\u8f93\u51fa\u529f\u7387\u8870\u51cf\u4ece\u7ea630 dB\u5230\u7ea6105 dB\u3002<\/p>\n\n\n\n
\u3000\u3000\u63d0\u9ad8\u7f51\u5173\u9ad8\u5ea6\u53ef\u4ee5\u6539\u5584RSSI\u503c\u3002\u4f8b\u5982\uff0c\u5728\u57ce\u5e02\u73af\u5883\u4e2d\uff0c\u7f51\u5173\u9ad8\u5ea6\u63d0\u5347\u523020\u7c73\u540e\uff0cRSSI\u503c\u76f8\u5bf9\u7a33\u5b9a\uff0c\u8fbe\u5230-75 dBm\u3002<\/p>\n\n\n\n
\u3000\u3000LoRa\u8bbe\u5907\u7684RSSI\u9608\u503c\u5728\u4e0d\u540c\u73af\u5883\u4e0b\u4f1a\u663e\u8457\u53d8\u5316\uff0c\u4e3b\u8981\u53d7\u8ddd\u79bb\u3001\u969c\u788d\u7269\u3001\u73af\u5883\u7c7b\u578b\u548c\u8bbe\u5907\u95f4\u5e72\u6270\u7b49\u56e0\u7d20\u7684\u5f71\u54cd\u3002<\/p>\n\n\n\n
\u3000\u3000\u8981\u4f18\u5316LoRa\u8bbe\u5907\u4ee5\u63d0\u9ad8\u5728\u4f4eRSSI\u503c\u4e0b\u7684\u6570\u636e\u4f20\u8f93\u6210\u529f\u7387\uff0c\u53ef\u4ee5\u91c7\u53d6\u4ee5\u4e0b\u51e0\u79cd\u7b56\u7565\uff1a<\/p>\n\n\n\n
\u3000\u3000\u6839\u636e\u7814\u7a76\uff0c\u5e26\u5bbd\u548c\u7f16\u7801\u7387\u5bf9RSSI\u503c\u6709\u663e\u8457\u5f71\u54cd\u3002\u8f83\u4f4e\u7684\u5e26\u5bbd(\u598231.25 KHz)\u901a\u5e38\u80fd\u83b7\u5f97\u66f4\u597d\u7684RSSI\u7ed3\u679c\uff0c\u800c\u8f83\u9ad8\u7684\u5e26\u5bbd(\u5982500 KHz)\u4f1a\u5bfc\u81f4RSSI\u4e0b\u964d\u3002\u540c\u65f6\uff0c\u8f83\u9ad8\u7684\u7f16\u7801\u7387(\u59824\/8)\u53ef\u4ee5\u63d0\u9ad8SNR\u548cRSSI\u503c\uff0c\u4f46\u4f1a\u589e\u52a0\u4f20\u8f93\u65f6\u95f4\u3002\u56e0\u6b64\uff0c\u5728\u4f4eRSSI\u73af\u5883\u4e0b\uff0c\u5efa\u8bae\u4f7f\u7528\u8f83\u4f4e\u7684\u5e26\u5bbd\u548c\u9002\u5f53\u7684\u7f16\u7801\u7387\u6765\u63d0\u9ad8\u4fe1\u53f7\u8d28\u91cf\u3002<\/p>\n\n\n\n
\u3000\u3000\u6269\u5c55\u56e0\u5b50\u5bf9\u4fe1\u53f7\u8986\u76d6\u8303\u56f4\u548c\u6570\u636e\u4f20\u8f93\u65f6\u95f4\u6709\u91cd\u8981\u5f71\u54cd\u3002\u8f83\u9ad8\u7684\u6269\u5c55\u56e0\u5b50(\u5982SF 12)\u867d\u7136\u53ef\u4ee5\u589e\u52a0\u8986\u76d6\u8303\u56f4\uff0c\u4f46\u4f1a\u964d\u4f4e\u6bd4\u7279\u7387\u3002\u5728\u4f4eRSSI\u73af\u5883\u4e0b\uff0c\u9009\u62e9\u9002\u5f53\u7684\u6269\u5c55\u56e0\u5b50\u4ee5\u5e73\u8861\u8986\u76d6\u8303\u56f4\u548c\u6570\u636e\u4f20\u8f93\u6548\u7387\u662f\u5173\u952e\u3002\u4f8b\u5982\uff0c\u5728\u57ce\u5e02\u73af\u5883\u4e2d\uff0cSF 7\u53ef\u80fd\u662f\u4e00\u4e2a\u8f83\u597d\u7684\u9009\u62e9\uff0c\u56e0\u4e3a\u5b83\u80fd\u591f\u5728\u4fdd\u6301\u8f83\u9ad8\u6bd4\u7279\u7387\u7684\u540c\u65f6\u63d0\u4f9b\u8f83\u597d\u7684\u8986\u76d6\u8303\u56f4\u3002<\/p>\n\n\n\n
\u3000\u3000\u81ea\u9002\u5e94\u6570\u636e\u901f\u7387\u6280\u672f\u53ef\u4ee5\u6839\u636e\u5b9e\u65f6\u7684RSSI\u503c\u52a8\u6001\u8c03\u6574\u6570\u636e\u901f\u7387\u8bbe\u7f6e\uff0c\u4ece\u800c\u4f18\u5316\u901a\u4fe1\u6027\u80fd\u3002\u589e\u91cf\u641c\u7d22\u3001\u4e8c\u8fdb\u5236\u641c\u7d22\u548cRSSI\u6700\u4f18\u641c\u7d22\u662f\u4e09\u79cd\u5e38\u89c1\u7684ADR\u4f18\u5316\u6280\u672f\uff0c\u53ef\u4ee5\u6839\u636e\u5b9e\u9645\u73af\u5883\u667a\u80fd\u9009\u62e9\u6700\u4f73\u7684\u6570\u636e\u901f\u7387\u8bbe\u7f6e\u3002<\/p>\n\n\n\n
\u3000\u3000\u63d0\u9ad8\u5929\u7ebf\u9ad8\u5ea6\u548c\u53d1\u5c04\u529f\u7387\u53ef\u4ee5\u663e\u8457\u6539\u5584\u4fe1\u53f7\u4f20\u8f93\u6027\u80fd\u3002\u5b9e\u9a8c\u8868\u660e\uff0c\u5929\u7ebf\u9ad8\u5ea6\u4ece\u5730\u97620\u7c73\u589e\u52a0\u52302.5\u7c73\u65f6\uff0cPDR\u503c\u63d0\u9ad8\u4e86\u7ea62%\u3002\u6b64\u5916\uff0c\u9002\u5f53\u589e\u52a0\u53d1\u5c04\u529f\u7387\u4e5f\u80fd\u63d0\u9ad8\u4fe1\u53f7\u5f3a\u5ea6\uff0c\u4f46\u9700\u6ce8\u610f\u4e0d\u8981\u8d85\u8fc7\u8bbe\u5907\u7684\u6700\u5927\u529f\u7387\u9650\u5236\u3002<\/p>\n\n\n\n
\u3000\u3000\u5728\u5f00\u653e\u73af\u5883\u4e2d\uff0cLoRa\u4fe1\u53f7\u5f3a\u5ea6\u968f\u4f20\u8f93\u8ddd\u79bb\u589e\u52a0\u800c\u4e0b\u964d\uff0c\u4f46\u5728\u4e00\u5b9a\u8ddd\u79bb\u5185(\u5982100\u7c73\u4ee5\u5185)\uff0c\u4fe1\u53f7\u5f3a\u5ea6\u548c\u6570\u636e\u4f20\u8f93\u6210\u529f\u7387\u8f83\u9ad8\u3002\u56e0\u6b64\uff0c\u5728\u8bbe\u8ba1LoRa\u7f51\u7edc\u65f6\uff0c\u5e94\u5c3d\u91cf\u9009\u62e9\u5f00\u9614\u7684\u73af\u5883\uff0c\u5e76\u63a7\u5236\u8bbe\u5907\u4e0e\u7f51\u5173\u4e4b\u95f4\u7684\u8ddd\u79bb\u3002<\/p>\n\n\n\n
\u3000\u3000\u901a\u8fc7\u673a\u5668\u5b66\u4e60\u6a21\u578b\u4f18\u5316LoRa\u4fe1\u53f7\u5f3a\u5ea6\u7684\u4f30\u8ba1\u7cbe\u5ea6\uff0c\u53ef\u4ee5\u66f4\u51c6\u786e\u5730\u9884\u6d4b\u548c\u8c03\u6574\u94fe\u8def\u9884\u7b97\u53c2\u6570\u3002\u4f8b\u5982\uff0c\u91c7\u7528\u591a\u9879\u5f0f\u56de\u5f52\u548c\u8d85\u53c2\u6570\u8c03\u6574\u7684\u65b9\u6cd5\u53ef\u4ee5\u663e\u8457\u63d0\u9ad8RSSI\u4f30\u8ba1\u7684\u7cbe\u5ea6\u3002<\/p>\n\n\n\n
\u3000\u3000LoRa\u6280\u672f\u4e2dRSSI\u503c\u4e0e\u4fe1\u53f7\u8d28\u91cf\u4e4b\u95f4\u7684\u5173\u7cfb\u7814\u7a76\u4e3b\u8981\u96c6\u4e2d\u5728\u4ee5\u4e0b\u51e0\u4e2a\u65b9\u9762\uff1a<\/p>\n\n\n\n
\u3000\u3000RSSI(\u63a5\u6536\u4fe1\u53f7\u5f3a\u5ea6\u6307\u793a)\u503c\u901a\u5e38\u4ee5dBm\u4e3a\u5355\u4f4d\uff0c\u5176\u503c\u8d8a\u63a5\u8fd10.\u8868\u793a\u4fe1\u53f7\u8d28\u91cf\u8d8a\u597d;\u53cd\u4e4b\uff0c\u503c\u8d8a\u5c0f\uff0c\u8868\u793a\u4fe1\u53f7\u8d28\u91cf\u8d8a\u5dee\u3002<\/p>\n\n\n\n
\u3000\u3000\u5728\u4e00\u4e9b\u5b9e\u9a8c\u4e2d\uff0c\u4f8b\u5982\u6551\u751f\u8863\u4eea\u5668\u7684\u73b0\u573a\u8bd5\u9a8c\uff0c\u53d1\u73b0\u968f\u7740\u4f20\u8f93\u8ddd\u79bb\u7684\u589e\u52a0\uff0cRSSI\u503c\u9010\u6e10\u51cf\u5c0f\uff0c\u8fd9\u8868\u660e\u4fe1\u53f7\u8d28\u91cf\u968f\u8ddd\u79bb\u589e\u52a0\u800c\u4e0b\u964d\u3002<\/p>\n\n\n\n
\u3000\u3000\u591a\u9879\u7814\u7a76\u8868\u660e\uff0cRSSI\u503c\u4e0e\u4f20\u8f93\u8ddd\u79bb\u6210\u53cd\u6bd4\u5173\u7cfb\uff0c\u5373\u8ddd\u79bb\u8d8a\u8fdc\uff0cRSSI\u503c\u8d8a\u4f4e\u3002\u4f8b\u5982\uff0c\u5728\u4e00\u9879\u7814\u7a76\u4e2d\uff0cRSSI\u503c\u4ece0\u7c73\u5904\u7684-55 dBm\u4e0b\u964d\u5230250\u7c73\u5904\u7684-112 dBm\u3002<\/p>\n\n\n\n
\u3000\u3000\u7136\u800c\uff0cRSSI\u503c\u7684\u53d8\u5316\u5e76\u4e0d\u603b\u662f\u7ebf\u6027\u7684\uff0c\u5b83\u8fd8\u53d7\u5230\u73af\u5883\u56e0\u7d20\u5982\u969c\u788d\u7269\u7684\u5f71\u54cd\u3002<\/p>\n\n\n\n
\u3000\u3000\u7814\u7a76\u6307\u51fa\uff0cLoRa\u8bbe\u5907\u63d0\u4f9b\u7684RSSI\u503c\u53ef\u80fd\u5b58\u5728\u8f83\u5927\u8bef\u5dee\uff0c\u6709\u65f6\u8bef\u5dee\u53ef\u8fbe\u523020 dB\uff0c\u8fd9\u4f1a\u5f71\u54cd\u8def\u5f84\u635f\u8017\u4f30\u8ba1\u7684\u51c6\u786e\u6027\u3002<\/p>\n\n\n\n
\u3000\u3000\u56e0\u6b64\uff0c\u9700\u8981\u5bf9LoRa\u8bbe\u5907\u8fdb\u884c\u6821\u51c6\u4ee5\u51cf\u5c11\u8fd9\u4e9b\u8bef\u5dee\u3002<\/p>\n\n\n\n
\u3000\u3000SNR(\u4fe1\u566a\u6bd4)\u662f\u8bc4\u4f30\u4fe1\u53f7\u8d28\u91cf\u7684\u91cd\u8981\u53c2\u6570\u3002\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\uff0cSNR\u4f4e\u4e8e0 dB\u65f6\uff0cRSSI\u503c\u4e3b\u8981\u53d7\u4fe1\u9053\u566a\u58f0\u548c\u5e72\u6270\u7684\u5f71\u54cd\uff0c\u5e76\u8d8b\u4e8e\u4e00\u4e2a\u6700\u5c0f\u503c\u3002<\/p>\n\n\n\n
\u3000\u3000\u5728\u53e6\u4e00\u9879\u7814\u7a76\u4e2d\uff0c\u901a\u8fc7\u6d4b\u91cf\u4e0d\u540c\u8870\u51cf\u7ea7\u522b\u7684RSSI\u548cSNR\u8868\u73b0\uff0c\u53d1\u73b0\u968f\u7740\u8870\u51cf\u7ea7\u522b\u7684\u589e\u52a0\uff0cRSSI\u503c\u663e\u8457\u4e0b\u964d\uff0c\u800cSNR\u503c\u5219\u8868\u73b0\u51fa\u4e0d\u540c\u7684\u53d8\u5316\u8d8b\u52bf\u3002<\/p>\n\n\n\n
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\u3000\u3000\u5728\u5f00\u9614\u73af\u5883\u4e2d\uff0cRSSI\u503c\u53ef\u80fd\u8f83\u9ad8\uff0c\u4f46\u5728\u6709\u5927\u91cf\u5efa\u7b51\u7269\u7684\u73af\u5883\u4e2d\uff0cRSSI\u503c\u4f1a\u968f\u8ddd\u79bb\u589e\u52a0\u800c\u8fc5\u901f\u4e0b\u964d\u3002<\/p>\n\n\n\n
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