\u3000\u3000LoRa\u7684RSSI(\u63a5\u6536\u4fe1\u53f7\u5f3a\u5ea6\u6307\u793a)\u662f\u6307\u5728LoRa\u901a\u4fe1\u7cfb\u7edf\u4e2d\uff0c\u63a5\u6536\u5668\u63a5\u6536\u5230\u7684\u4fe1\u53f7\u5f3a\u5ea6\u7684\u6d4b\u91cf\u503c\u3002RSSI\u901a\u5e38\u4ee5dBm\u4e3a\u5355\u4f4d\u8868\u793a\uff0c\u5e76\u4e14\u662f\u4e00\u4e2a\u8d1f\u503c\uff0c\u6570\u503c\u8d8a\u63a5\u8fd10\u8868\u793a\u4fe1\u53f7\u8d8a\u5f3a\uff0c\u6570\u503c\u8d8a\u8fdc\u79bb0\u8868\u793a\u4fe1\u53f7\u8d8a\u5f31\u3002RSSI\u503c\u7528\u4e8e\u8bc4\u4f30\u4fe1\u53f7\u8d28\u91cf\uff0c\u5e2e\u52a9\u5224\u65ad\u8bbe\u5907\u4e4b\u95f4\u7684\u901a\u4fe1\u662f\u5426\u7a33\u5b9a\u3002<\/p>\n\n\n\n
\u3000\u3000\u5728LoRa\u7cfb\u7edf\u4e2d\uff0cRSSI\u503c\u53d7\u5230\u591a\u79cd\u56e0\u7d20\u7684\u5f71\u54cd\uff0c\u5305\u62ec\u53d1\u5c04\u5668\u548c\u63a5\u6536\u5668\u4e4b\u95f4\u7684\u8ddd\u79bb\u3001\u73af\u5883\u969c\u788d\u7269\u3001\u591a\u5f84\u6548\u5e94\u7b49\u3002RSSI\u503c\u901a\u5e38\u7528\u4e8e\u5b9a\u4f4d\u7cfb\u7edf\u4e2d\uff0c\u901a\u8fc7\u6d4b\u91cf\u4e0d\u540c\u63a5\u6536\u5668\u63a5\u6536\u5230\u7684\u4fe1\u53f7\u5f3a\u5ea6\u6765\u4f30\u7b97\u8bbe\u5907\u7684\u4f4d\u7f6e\u3002\u6b64\u5916\uff0cRSSI\u503c\u4e5f\u88ab\u7528\u4e8e\u8bc4\u4f30\u7f51\u7edc\u8986\u76d6\u8303\u56f4\u548c\u4fe1\u9053\u5360\u7528\u60c5\u51b5\u3002<\/p>\n\n\n\n
\u3000\u3000\u56e0\u6b64\uff0cLoRa\u7684RSSI\u662f\u6307LoRa\u901a\u4fe1\u7cfb\u7edf\u4e2d\u63a5\u6536\u5668\u63a5\u6536\u5230\u7684\u4fe1\u53f7\u5f3a\u5ea6\u7684\u6d4b\u91cf\u503c\uff0c\u8fd9\u4e2a\u503c\u53cd\u6620\u4e86\u4fe1\u53f7\u7684\u8d28\u91cf\u548c\u4f20\u8f93\u7684\u6709\u6548\u6027\u3002<\/p>\n\n\n\n
\u3000\u3000LoRa RSSI\u503c\u7684\u51c6\u786e\u6d4b\u91cf\u548c\u8ba1\u7b97\u6d89\u53ca\u591a\u4e2a\u6b65\u9aa4\u548c\u65b9\u6cd5\uff0c\u4ee5\u786e\u4fdd\u4fe1\u53f7\u5f3a\u5ea6\u6307\u793a(RSSI)\u503c\u7684\u53ef\u9760\u6027\u548c\u51c6\u786e\u6027\u3002\u4ee5\u4e0b\u662f\u8be6\u7ec6\u7684\u6b65\u9aa4\u548c\u65b9\u6cd5\uff1a<\/p>\n\n\n\n
\u3000\u3000RSSI\u503c\u662f\u63a5\u6536\u4fe1\u53f7\u5f3a\u5ea6\u6307\u793a\uff0c\u901a\u5e38\u4ee5dBm\u4e3a\u5355\u4f4d\u8868\u793a\uff0c\u7528\u4e8e\u8861\u91cf\u63a5\u6536\u7aef\u63a5\u6536\u5230\u7684\u65e0\u7ebf\u7535\u4fe1\u53f7\u7684\u5f3a\u5ea6\u3002RSSI\u503c\u8d8a\u63a5\u8fd10 dBm\uff0c\u8868\u793a\u4fe1\u53f7\u8d8a\u5f3a;\u53cd\u4e4b\uff0c\u503c\u8d8a\u5c0f\uff0c\u8868\u793a\u4fe1\u53f7\u8d8a\u5f31\u3002<\/p>\n\n\n\n
\u3000\u3000\u5728LoRa\u7cfb\u7edf\u4e2d\uff0cRSSI\u503c\u53ef\u4ee5\u901a\u8fc7LoRa\u96c6\u6210\u7535\u8def(IC)\u81ea\u52a8\u6d4b\u91cf\uff0c\u5f53\u63a5\u6536\u5230\u6709\u6548\u6570\u636e\u5305\u65f6\u8fdb\u884c\u6d4b\u91cf\u3002\u6d4b\u91cf\u8bef\u5dee\u901a\u5e38\u57282\u52306 dBm\u4e4b\u95f4\uff0c\u5177\u4f53\u53d6\u51b3\u4e8e\u6240\u4f7f\u7528\u7684\u5e73\u5747\u6b21\u6570\u3002<\/p>\n\n\n\n
\u3000\u3000\u7531\u4e8e\u4fe1\u53f7\u5728\u4f20\u64ad\u8fc7\u7a0b\u4e2d\u53ef\u80fd\u4f1a\u53d7\u5230\u53cd\u5c04\u3001\u884d\u5c04\u7b49\u5f71\u54cd\uff0c\u5bfc\u81f4RSSI\u503c\u6ce2\u52a8\u8f83\u5927\u3002\u56e0\u6b64\uff0c\u5728\u91c7\u96c6RSSI\u503c\u540e\uff0c\u9700\u8981\u5bf9\u6570\u636e\u8fdb\u884c\u6ee4\u6ce2\u5904\u7406\u3002\u4f8b\u5982\uff0c\u53ef\u4ee5\u91c7\u96c6\u8fde\u7eed30\u79d2\u5185\u7684RSSI\u503c\uff0c\u53d6\u4e2d\u95f420\u79d2\u5185\u7a33\u5b9a\u7684\u4e00\u6bb5\u6570\u636e\uff0c\u5e76\u8ba1\u7b97\u6bcf\u4e24\u4e2a\u76f8\u90bbRSSI\u503c\u7684\u5dee\u503c\uff0c\u53bb\u9664\u4ea7\u751f\u8df3\u53d8\u7684RSSI\u503c\uff0c\u6700\u540e\u53d6\u5269\u4e0b\u7684RSSI\u503c\u7684\u5e73\u5747\u503c\u3002<\/p>\n\n\n\n
\u3000\u3000\u5728\u975e\u89c6\u8ddd(NLOS)\u73af\u5883\u4e2d\uff0c\u969c\u788d\u7269\u4f1a\u4ea7\u751f\u5e72\u6270\u6027\u7684\u4fe1\u53f7\uff0c\u5f71\u54cdRSSI\u503c\u7684\u51c6\u786e\u6027\u3002\u4e3a\u4e86\u89e3\u51b3\u8fd9\u4e00\u95ee\u9898\uff0c\u53ef\u4ee5\u91c7\u7528\u5361\u5c14\u66fc\u6ee4\u6ce2\u5668\u6765\u8fc7\u6ee4RSSI\u503c\u4e2d\u7684\u566a\u58f0\u3002\u5361\u5c14\u66fc\u6ee4\u6ce2\u5668\u4f7f\u7528\u524d\u4e00\u4e2aRSSI\u503c\u6a21\u578b\u6765\u4f30\u8ba1\u7406\u60f3\u7684\u65e0\u7ebf\u7535\u4fe1\u53f7RSSI\u503c\u3002<\/p>\n\n\n\n
\u3000\u3000RSSI\u503c\u7684\u51c6\u786e\u6027\u8fd8\u53d7\u5230\u73af\u5883\u56e0\u7d20\u7684\u5f71\u54cd\uff0c\u5982\u9634\u5f71\u6548\u5e94\u548c\u591a\u5f84\u6548\u5e94\u3002\u8fd9\u4e9b\u6548\u5e94\u4f1a\u5bfc\u81f4\u4fe1\u53f7\u8def\u5f84\u635f\u8017\u7684\u53d8\u5316\uff0c\u56e0\u6b64\u5728\u8ba1\u7b97RSSI\u503c\u65f6\u9700\u8981\u8003\u8651\u8fd9\u4e9b\u56e0\u7d20\u3002<\/p>\n\n\n\n
\u3000\u3000\u5728\u5b9e\u9645\u5e94\u7528\u4e2d\uff0c\u9700\u8981\u6839\u636e\u5177\u4f53\u73af\u5883\u5bf9RSSI\u503c\u8fdb\u884c\u6821\u51c6\u548c\u8c03\u6574\u3002\u4f8b\u5982\uff0c\u5728\u5ba4\u5185\u5b9a\u4f4d\u7cfb\u7edf\u4e2d\uff0c\u53ef\u4ee5\u901a\u8fc7\u6d4b\u91cf\u4e0d\u540c\u4f4d\u7f6e\u7684RSSI\u503c\u6765\u5efa\u7acb\u4f4d\u7f6e\u6307\u7eb9\u6570\u636e\u5e93\uff0c\u4ece\u800c\u63d0\u9ad8\u5b9a\u4f4d\u7684\u51c6\u786e\u6027\u3002<\/p>\n\n\n\n
\u3000\u3000LoRa RSSI\u503c\u7684\u51c6\u786e\u6d4b\u91cf\u548c\u8ba1\u7b97\u9700\u8981\u7efc\u5408\u8003\u8651\u786c\u4ef6\u6d4b\u91cf\u8bef\u5dee\u3001\u6ee4\u6ce2\u5904\u7406\u3001\u73af\u5883\u56e0\u7d20\u4ee5\u53ca\u5b9e\u9645\u5e94\u7528\u4e2d\u7684\u6821\u51c6\u548c\u8c03\u6574\u3002<\/p>\n\n\n\n
\u3000\u3000\u5728LoRa\u7cfb\u7edf\u4e2d\uff0c\u63a5\u6536\u4fe1\u53f7\u5f3a\u5ea6\u6307\u793a(RSSI)\u503c\u5bf9\u901a\u4fe1\u7a33\u5b9a\u6027\u548c\u7f51\u7edc\u8986\u76d6\u8303\u56f4\u6709\u663e\u8457\u5f71\u54cd\u3002\u4ee5\u4e0b\u662f\u57fa\u4e8e\u6211\u641c\u7d22\u5230\u7684\u8d44\u6599\u8be6\u7ec6\u5206\u6790\uff1a<\/p>\n\n\n\n
\u3000\u3000RSSI\u503c\u662f\u8bc4\u4f30LoRa\u901a\u4fe1\u7a33\u5b9a\u6027\u7684\u5173\u952e\u6307\u6807\u3002\u8f83\u9ad8\u7684RSSI\u503c\u901a\u5e38\u8868\u793a\u4fe1\u53f7\u5f3a\u5ea6\u8f83\u9ad8\uff0c\u4ece\u800c\u63d0\u9ad8\u901a\u4fe1\u7684\u53ef\u9760\u6027\u3002\u4f8b\u5982\uff0c\u5728\u5b9e\u9a8c\u4e2d\uff0c\u5f53RSSI\u503c\u4e3a-50 dBm\u65f6\uff0c\u6570\u636e\u5305\u63a5\u6536\u7387\u8fbe\u5230\u4e86100%\uff0c\u800c\u5f53RSSI\u503c\u4e3a-73 dBm\u65f6\uff0c\u63a5\u6536\u7387\u4e5f\u4fdd\u6301\u5728\u8f83\u9ad8\u6c34\u5e73\u3002<\/p>\n\n\n\n
\u3000\u3000\u7814\u7a76\u8868\u660e\uff0c\u589e\u52a0\u6269\u5c55\u56e0\u5b50(SF)\u53ef\u4ee5\u964d\u4f4eRSSI\u503c\uff0c\u4f46\u540c\u65f6\u63d0\u9ad8\u4fe1\u53f7\u7684\u7a33\u5b9a\u6027\u548c\u5f3a\u5ea6\u3002\u4f8b\u5982\uff0c\u5728\u5e26\u5bbd\u4e3a125 kHz\u7684\u60c5\u51b5\u4e0b\uff0cSF\u4e3a7\u30019\u548c12\u65f6\uff0cRSSI\u503c\u968f\u6269\u5c55\u56e0\u5b50\u589e\u52a0\u800c\u964d\u4f4e\u3002<\/p>\n\n\n\n
\u3000\u3000\u4e0d\u540c\u7684RSSI\u503c\u5bf9\u4fe1\u566a\u6bd4(SNR)\u4e5f\u6709\u5f71\u54cd\u3002\u8f83\u9ad8\u7684SNR\u503c\u901a\u5e38\u610f\u5473\u7740\u63a5\u6536\u4fe1\u53f7\u9ad8\u4e8e\u566a\u58f0\u95e8\u69db\uff0c\u4ece\u800c\u63d0\u9ad8\u901a\u4fe1\u8d28\u91cf\u3002\u7136\u800c\uff0c\u968f\u7740\u8ddd\u79bb\u589e\u52a0\u6216\u5b58\u5728\u5e72\u6270\uff0cSNR\u503c\u53ef\u80fd\u4f1a\u964d\u4f4e\uff0c\u4ece\u800c\u5f71\u54cd\u901a\u4fe1\u7a33\u5b9a\u6027\u3002<\/p>\n\n\n\n
\u3000\u3000RSSI\u503c\u4e0e\u7f51\u7edc\u8986\u76d6\u8303\u56f4\u5bc6\u5207\u76f8\u5173\u3002\u968f\u7740\u8282\u70b9\u95f4\u8ddd\u79bb\u7684\u589e\u52a0\uff0cRSSI\u503c\u9010\u6e10\u51cf\u5c0f\u3002\u4f8b\u5982\uff0c\u5728\u6ca1\u6709\u969c\u788d\u7269\u7684\u60c5\u51b5\u4e0b\uff0c\u8282\u70b9\u8ddd\u79bb\u4e3a100\u7c73\u65f6RSSI\u503c\u4e3a-62 dBm\uff0c\u800c\u8ddd\u79bb\u589e\u52a0\u5230200\u7c73\u65f6RSSI\u503c\u964d\u81f3-72 dBm\uff0c\u6700\u5927\u4f20\u8f93\u8ddd\u79bb1500\u7c73\u65f6RSSI\u503c\u964d\u81f3-122 dBm\u3002<\/p>\n\n\n\n
\u3000\u3000\u5728\u5b9e\u9645\u5e94\u7528\u4e2d\uff0cRSSI\u503c\u7684\u53d8\u5316\u53cd\u6620\u4e86\u7f51\u7edc\u8986\u76d6\u7684\u5e7f\u5ea6\u548c\u6df1\u5ea6\u3002\u4f8b\u5982\uff0c\u5728\u4e00\u4e2a\u5927\u5b66\u6821\u56ed\u5185\uff0cLoRaWAN\u7f51\u5173\u5b89\u88c5\u5728\u7269\u7406\u697c\u9876\u4e0a\uff0cRSSI\u503c\u5728\u4e0d\u540c\u4f4d\u7f6e\u7684\u53d8\u5316\u663e\u793a\u4e86\u4fe1\u53f7\u8986\u76d6\u7684\u8303\u56f4\u548c\u8d28\u91cf\u3002<\/p>\n\n\n\n
\u3000\u3000\u7814\u7a76\u8fd8\u6307\u51fa\uff0c\u5f53RSSI\u503c\u5c0f\u4e8e\u6216\u7b49\u4e8e-120 dB\u65f6\uff0c\u4fe1\u53f7\u88ab\u8ba4\u4e3a\u8f83\u5f31\uff0c\u8fd9\u8868\u660e\u5728\u8fd9\u4e9b\u6761\u4ef6\u4e0b\u7f51\u7edc\u8986\u76d6\u53ef\u80fd\u4e0d\u8db3\u3002<\/p>\n\n\n\n
\u3000\u3000RSSI\u503c\u4e0d\u4ec5\u53d7\u8ddd\u79bb\u5f71\u54cd\uff0c\u8fd8\u53ef\u80fd\u53d7\u5230\u5efa\u7b51\u7269\u3001\u5899\u58c1\u548c\u5176\u4ed6\u969c\u788d\u7269\u7684\u5f71\u54cd\u3002\u4f8b\u5982\uff0c\u5728\u667a\u80fd\u5b9e\u9a8c\u5ba4\u76d1\u63a7\u7cfb\u7edf\u4e2d\uff0c\u4e0d\u540c\u623f\u95f4\u7684\u8bbe\u5907\u7531\u4e8e\u9694\u5899\u7b49\u5e72\u6270\u5bfc\u81f4RSSI\u503c\u4e0d\u540c\u3002<\/p>\n\n\n\n
\u3000\u3000\u5728\u8239\u8236\u73af\u5883\u4e2d\uff0cRSSI\u503c\u4f1a\u56e0\u7532\u677f\u9ad8\u5ea6\u548c\u673a\u68b0\u7a7a\u95f4\u7684\u4f4d\u7f6e\u800c\u53d8\u5316\u3002\u4f8b\u5982\uff0c\u5728\u53d1\u52a8\u673a\u5ba4\u5468\u56f4\u7684RSSI\u503c\u8f83\u9ad8\uff0c\u800c\u5728\u4e3b\u7532\u677f\u548c\u4e0a\u7532\u677f\u7684RSSI\u503c\u8f83\u4f4e\u3002<\/p>\n\n\n\n
\u3000\u3000RSSI\u503c\u5728LoRa\u7cfb\u7edf\u4e2d\u8d77\u7740\u81f3\u5173\u91cd\u8981\u7684\u4f5c\u7528\u3002\u8f83\u9ad8\u7684RSSI\u503c\u901a\u5e38\u610f\u5473\u7740\u66f4\u597d\u7684\u901a\u4fe1\u7a33\u5b9a\u6027\u548c\u66f4\u5e7f\u7684\u7f51\u7edc\u8986\u76d6\u8303\u56f4\u3002\u7136\u800c\uff0cRSSI\u503c\u4f1a\u53d7\u5230\u591a\u79cd\u56e0\u7d20\u7684\u5f71\u54cd\uff0c\u5305\u62ec\u8ddd\u79bb\u3001\u6269\u5c55\u56e0\u5b50\u3001\u5e26\u5bbd\u3001\u4fe1\u566a\u6bd4\u4ee5\u53ca\u73af\u5883\u4e2d\u7684\u969c\u788d\u7269\u548c\u5e72\u6270\u3002<\/p>\n\n\n\n
\u3000\u3000\u5229\u7528LoRa RSSI\u503c\u8fdb\u884c\u8bbe\u5907\u5b9a\u4f4d\u7684\u65b9\u6cd5\u4e3b\u8981\u4f9d\u8d56\u4e8e\u63a5\u6536\u4fe1\u53f7\u5f3a\u5ea6\u6307\u793a(RSSI)\u6765\u4f30\u8ba1\u8bbe\u5907\u4e0e\u591a\u4e2a\u57fa\u7ad9\u4e4b\u95f4\u7684\u8ddd\u79bb\uff0c\u7136\u540e\u901a\u8fc7\u4e09\u89d2\u6d4b\u91cf\u6216\u5176\u4ed6\u7b97\u6cd5\u8ba1\u7b97\u51fa\u8bbe\u5907\u7684\u7cbe\u786e\u4f4d\u7f6e\u3002\u4ee5\u4e0b\u662f\u8be6\u7ec6\u6b65\u9aa4\u548c\u76f8\u5173\u6280\u672f\uff1a<\/p>\n\n\n\n
\u3000\u3000\u5176\u4e2d\uff0cAA\u662f\u53c2\u8003RSSI\u503c\uff0cnn\u662f\u8def\u5f84\u635f\u8017\u6307\u6570\uff0cdd\u662f\u8ddd\u79bb\u3002<\/p>\n\n\n\n
\u3000\u3000\u5728\u5ba4\u5185\u73af\u5883\u4e2d\uff0c\u7531\u4e8e\u591a\u5f84\u8870\u843d\u7684\u5f71\u54cd\uff0cRSSI\u503c\u53ef\u80fd\u4f1a\u53d7\u5230\u5e72\u6270\u3002\u4e3a\u4e86\u514b\u670d\u8fd9\u4e00\u95ee\u9898\uff0c\u53ef\u4ee5\u4f7f\u7528\u5361\u5c14\u66fc\u6ee4\u6ce2\u5668\u6765\u5e73\u6ed1RSSI\u6570\u636e\uff0c\u4ece\u800c\u63d0\u9ad8\u5b9a\u4f4d\u7cbe\u5ea6\u3002\u5361\u5c14\u66fc\u6ee4\u6ce2\u5668\u901a\u8fc7\u9884\u6d4b\u548c\u66f4\u65b0\u6b65\u9aa4\uff0c\u51cf\u5c11\u566a\u58f0\u548c\u8bef\u5dee\uff0c\u4ece\u800c\u63d0\u4f9b\u66f4\u51c6\u786e\u7684\u8ddd\u79bb\u4f30\u8ba1\u3002<\/p>\n\n\n\n
\u3000\u3000\u5229\u7528\u4e09\u4e2a\u6216\u66f4\u591a\u7684\u57fa\u7ad9(BS)\u6d4b\u91cf\u8bbe\u5907\u5230\u6bcf\u4e2a\u57fa\u7ad9\u7684\u8ddd\u79bb\uff0c\u7136\u540e\u901a\u8fc7\u4e09\u89d2\u6d4b\u91cf\u7b97\u6cd5\u8ba1\u7b97\u8bbe\u5907\u7684\u4f4d\u7f6e\u3002\u4e09\u89d2\u6d4b\u91cf\u7684\u57fa\u672c\u539f\u7406\u662f\u5229\u7528\u5df2\u77e5\u57fa\u7ad9\u7684\u4f4d\u7f6e\u548c\u5230\u8bbe\u5907\u7684\u8ddd\u79bb\uff0c\u901a\u8fc7\u51e0\u4f55\u5173\u7cfb\u786e\u5b9a\u8bbe\u5907\u7684\u5750\u6807\u3002<\/p>\n\n\n\n
\u3000\u3000\u5728\u76f4\u89c6(LOS)\u6761\u4ef6\u4e0b\uff0c\u8bbe\u5907\u548c\u57fa\u7ad9\u4e4b\u95f4\u6ca1\u6709\u969c\u788d\u7269\u963b\u6321\u4fe1\u53f7\u4f20\u8f93\uff0cRSSI\u503c\u8f83\u4e3a\u7a33\u5b9a\uff0c\u5b9a\u4f4d\u7cbe\u5ea6\u8f83\u9ad8\u3002\u5728\u975e\u76f4\u89c6(NLOS)\u6761\u4ef6\u4e0b\uff0c\u4fe1\u53f7\u53ef\u80fd\u4f1a\u53d7\u5230\u5efa\u7b51\u7269\u3001\u6811\u6728\u7b49\u969c\u788d\u7269\u7684\u5f71\u54cd\uff0c\u5bfc\u81f4RSSI\u503c\u6ce2\u52a8\u8f83\u5927\u3002\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u53ef\u4ee5\u91c7\u7528\u6539\u8fdb\u7684\u8def\u5f84\u635f\u8017\u6a21\u578b\u548c\u5361\u5c14\u66fc\u6ee4\u6ce2\u5668\u6765\u63d0\u9ad8\u5b9a\u4f4d\u7cbe\u5ea6\u3002<\/p>\n\n\n\n
\u3000\u3000\u5b9e\u9a8c\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528MATLAB\u7b49\u8f6f\u4ef6\u8fdb\u884c\u6570\u636e\u5206\u6790\uff0c\u5e76\u901a\u8fc7\u5b9e\u9645\u90e8\u7f72\u6d4b\u8bd5\u7cfb\u7edf\u7684\u6027\u80fd\u3002\u4f8b\u5982\uff0c\u5728\u5b9e\u9a8c\u4e2d\u4f7f\u7528Dragino LoRa Arduino shield\u4f5c\u4e3a\u57fa\u7ad9\uff0c\u5e76\u914d\u5907ESP32\u5fae\u63a7\u5236\u5668\u548cLoRa Raspberry Pi hat\u4f5c\u4e3a\u7f51\u5173\uff0c\u901a\u8fc7\u57fa\u7ad9\u63a5\u6536\u7ec8\u7aef\u8282\u70b9\u4fe1\u53f7\u5e76\u5904\u7406\u566a\u58f0\u6570\u636e\uff0c\u6700\u7ec8\u9884\u6d4b\u7ec8\u7aef\u8282\u70b9\u4f4d\u7f6e\u3002<\/p>\n\n\n\n
\u3000\u3000\u53ef\u4ee5\u7ed3\u5408\u5176\u4ed6\u5b9a\u4f4d\u65b9\u6cd5\u5982\u5230\u8fbe\u65f6\u95f4\u5dee(TDoA)\u548c\u6307\u7eb9\u7b97\u6cd5\u6765\u8fdb\u4e00\u6b65\u63d0\u9ad8\u5b9a\u4f4d\u7cbe\u5ea6\u3002\u4f8b\u5982\uff0c\u6307\u7eb9\u7b97\u6cd5\u901a\u8fc7\u5339\u914d\u89c2\u5bdf\u5230\u7684RSSI\u4e0e\u9884\u5148\u751f\u6210\u7684\u65e0\u7ebf\u7535\u56fe\u6765\u4f30\u8ba1\u4f4d\u7f6e\uff0c\u8fd9\u79cd\u65b9\u6cd5\u5728\u5927\u8303\u56f4\u533a\u57df\u5185\u7684\u5b9a\u4f4d\u7cbe\u5ea6\u8f83\u9ad8\u3002<\/p>\n\n\n\n
\u3000\u3000\u603b\u4e4b\uff0c\u5229\u7528LoRa RSSI\u503c\u8fdb\u884c\u8bbe\u5907\u5b9a\u4f4d\u6d89\u53ca\u591a\u4e2a\u6b65\u9aa4\u548c\u6280\u672f\u7684\u7efc\u5408\u5e94\u7528\uff0c\u5305\u62ecRSSI\u6d4b\u91cf\u3001\u8def\u5f84\u635f\u8017\u6a21\u578b\u3001\u5361\u5c14\u66fc\u6ee4\u6ce2\u5668\u3001\u4e09\u89d2\u6d4b\u91cf\u4ee5\u53ca\u5728\u4e0d\u540c\u73af\u5883\u6761\u4ef6\u4e0b\u7684\u4f18\u5316\u5904\u7406\u3002<\/p>\n\n\n\n
\u3000\u3000LoRa(Long Range)\u6280\u672f\u5728\u591a\u5f84\u6548\u5e94\u4e0b\u7684RSSI(\u63a5\u6536\u4fe1\u53f7\u5f3a\u5ea6\u6307\u793a)\u503c\u8868\u73b0\u548c\u5904\u7406\u65b9\u6cd5\u6d89\u53ca\u591a\u4e2a\u65b9\u9762\u3002\u4ee5\u4e0b\u662f\u8be6\u7ec6\u7684\u5206\u6790\uff1a<\/p>\n\n\n\n
\u3000\u3000\u591a\u5f84\u6548\u5e94\u662f\u6307\u4fe1\u53f7\u5728\u4f20\u64ad\u8fc7\u7a0b\u4e2d\u9047\u5230\u969c\u788d\u7269\u53cd\u5c04\u3001\u6298\u5c04\u6216\u6563\u5c04\uff0c\u5bfc\u81f4\u591a\u4e2a\u8def\u5f84\u540c\u65f6\u5230\u8fbe\u63a5\u6536\u5668\uff0c\u4ece\u800c\u5f15\u8d77\u4fe1\u53f7\u5f3a\u5ea6\u7684\u6ce2\u52a8\u3002\u8fd9\u79cd\u73b0\u8c61\u5728LoRa\u7cfb\u7edf\u4e2d\u5c24\u4e3a\u663e\u8457\uff0c\u5c24\u5176\u662f\u5728\u5ba4\u5185\u73af\u5883\u4e2d\u3002\u4f8b\u5982\uff0c\u5728\u5b9e\u9a8c\u4e2d\uff0c\u7531\u4e8e\u660e\u663e\u7684\u591a\u5f84\u6548\u5e94\uff0cRSSI\u503c\u4f1a\u8868\u73b0\u51fa\u53cc\u5cf0\u5206\u5e03\uff0c\u5373\u63a5\u6536\u4fe1\u53f7\u5f3a\u5ea6\u4f1a\u6709\u8f83\u5927\u7684\u6ce2\u52a8\u3002<\/p>\n\n\n\n
\u3000\u3000\u5728\u591a\u5f84\u73af\u5883\u4e2d\uff0cRSSI\u503c\u4f1a\u968f\u65f6\u95f4\u53d8\u5316\uff0c\u5e76\u53d7\u53d1\u5c04\u5668\u548c\u63a5\u6536\u5668\u9644\u8fd1\u7269\u4f53\u4f4d\u7f6e\u7684\u5c0f\u5e45\u53d8\u5316\u5f71\u54cd\u3002\u968f\u7740\u8ddd\u79bb\u589e\u52a0\uff0cRSSI\u7684\u5e73\u5747\u503c\u8870\u51cf\uff0c\u7528\u4e8e\u9884\u6d4b\u65e0\u7ebf\u7f51\u7edc\u8986\u76d6\u548c\u5e72\u6270\u3002\u4f8b\u5982\uff0c\u5728\u67d0\u4e9b\u5b9e\u9a8c\u4e2d\uff0cRSSI\u503c\u7684\u6ce2\u52a8\u5e45\u5ea6\u53ef\u4ee5\u8fbe\u52302 dB\u5cf0\u5cf0\u503c\uff0c\u8868\u660e\u5b58\u5728\u4e0d\u663e\u773c\u7684\u591a\u5f84\u4f20\u64ad\u3002<\/p>\n\n\n\n
\u3000\u3000\u5728\u591a\u5f84\u6548\u5e94\u4e0b\uff0cRSSI\u503c\u7684\u53d8\u5316\u901a\u5e38\u4f34\u968f\u7740\u4fe1\u566a\u6bd4(SNR)\u7684\u53d8\u5316\u3002\u4f8b\u5982\uff0c\u5728\u67d0\u4e9b\u5b9e\u9a8c\u4e2d\uff0c\u5f53RSSI\u589e\u52a0\u65f6\uff0cSNR\u4e0b\u964d\uff0c\u8fd9\u8868\u660e\u591a\u5f84\u6548\u5e94\u5bf9\u4fe1\u53f7\u8d28\u91cf\u6709\u8d1f\u9762\u5f71\u54cd\u3002<\/p>\n\n\n\n
\u3000\u3000\u5361\u5c14\u66fc\u6ee4\u6ce2\u5668\u662f\u4e00\u79cd\u6709\u6548\u7684\u4fe1\u53f7\u5904\u7406\u6280\u672f\uff0c\u53ef\u4ee5\u51cf\u8f7b\u591a\u5f84\u8870\u843d\u7684\u5f71\u54cd\u3002\u901a\u8fc7\u7ed3\u5408\u5bf9\u6570\u8ddd\u79bb\u4f20\u64ad\u6a21\u578b\uff0c\u5361\u5c14\u66fc\u6ee4\u6ce2\u5668\u80fd\u591f\u51c6\u786e\u4f30\u8ba1\u8ddd\u79bb\uff0c\u5e76\u51cf\u5c11\u5b9a\u4f4d\u8bef\u5dee\u3002\u4f8b\u5982\uff0c\u5728\u975e\u89c6\u8ddd(NLOS)\u573a\u666f\u4e0b\uff0c\u4f7f\u7528\u5361\u5c14\u66fc\u6ee4\u6ce2\u5668\u53ef\u4ee5\u663e\u8457\u51cf\u5c11\u5b9a\u4f4d\u8bef\u5dee\uff0c\u8fbe\u5230\u66f4\u9ad8\u7684\u51c6\u786e\u6027\u3002<\/p>\n\n\n\n
\u3000\u3000\u7c92\u5b50\u6ee4\u6ce2\u5668\u662f\u4e00\u79cd\u57fa\u4e8e\u6982\u7387\u7684\u4f30\u8ba1\u65b9\u6cd5\uff0c\u80fd\u591f\u6709\u6548\u5904\u7406\u591a\u5f84\u8870\u843d\u6548\u5e94\u3002\u901a\u8fc7\u7c92\u5b50\u6ee4\u6ce2\u6280\u672f\uff0c\u53ef\u4ee5\u5b9e\u73b0\u66f4\u7cbe\u786e\u7684\u8ddd\u79bb\u4f30\u8ba1\u548c\u4f4d\u7f6e\u4f30\u8ba1\u3002\u4f8b\u5982\uff0c\u5728\u5ba4\u5185\u5b9a\u4f4d\u7cfb\u7edf\u4e2d\uff0c\u7c92\u5b50\u6ee4\u6ce2\u5668\u7ed3\u5408\u4e09\u8fb9\u5b9a\u4f4d\u6280\u672f\uff0c\u53ef\u4ee5\u663e\u8457\u51cf\u5c11\u5b9a\u4f4d\u8bef\u5dee\uff0c\u63d0\u9ad8\u5b9a\u4f4d\u7cbe\u5ea6\u3002<\/p>\n\n\n\n
\u3000\u3000\u8fd9\u79cd\u65b9\u6cd5\u7ed3\u5408\u4e86RSSI\u548c\u5230\u8fbe\u65f6\u95f4\u5dee(TDoA)\u6280\u672f\uff0c\u4ee5\u51cf\u8f7b\u591a\u5f84\u5e72\u6270\u7684\u5f71\u54cd\u3002\u7279\u522b\u662f\uff0c\u8be5\u65b9\u6cd5\u80fd\u591f\u5904\u7406\u4f20\u64ad\u5ef6\u8fdf\u5dee\u5f02\u8f83\u5c0f\u7684\u60c5\u51b5\uff0c\u4ece\u800c\u63d0\u9ad8\u5b9a\u4f4d\u7cbe\u5ea6\u548c\u9c81\u68d2\u6027\u3002<\/p>\n\n\n\n
\u3000\u3000\u4f7f\u7528\u8def\u5f84\u635f\u8017\u6a21\u578b\u6765\u8bc4\u4f30RSSI\u503c\u7684\u53d8\u5316\u3002\u4f8b\u5982\uff0c\u5728\u519c\u4e1a\u533a\u57df\u7684433 MHz LoRa\u4fe1\u9053\u4e2d\uff0c\u901a\u8fc7\u6bd4\u8f83RSSI\u548c\u8def\u5f84\u635f\u8017\u6a21\u578b\u7684\u884c\u4e3a\uff0c\u53ef\u4ee5\u8bc4\u4f30\u4e0d\u540c\u7528\u6237\u963b\u585e\u60c5\u51b5\u4e0b\u7684\u4fe1\u53f7\u5f3a\u5ea6\u53d8\u5316\u3002<\/p>\n\n\n\n
\u3000\u3000LoRa\u7cfb\u7edf\u5728\u591a\u5f84\u6548\u5e94\u4e0bRSSI\u503c\u7684\u8868\u73b0\u4e3b\u8981\u8868\u73b0\u4e3a\u4fe1\u53f7\u5f3a\u5ea6\u7684\u6ce2\u52a8\u548c\u4fe1\u566a\u6bd4\u7684\u53d8\u5316\u3002<\/p>\n\n\n\n
\u3000\u3000\u5728LoRa\u7f51\u7edc\u4e2d\uff0cRSSI(\u63a5\u6536\u4fe1\u53f7\u5f3a\u5ea6\u6307\u793a)\u503c\u4e0e\u4fe1\u9053\u5360\u7528\u60c5\u51b5\u4e4b\u95f4\u5b58\u5728\u5bc6\u5207\u5173\u7cfb\u3002RSSI\u503c\u53cd\u6620\u4e86\u63a5\u6536\u7aef\u63a5\u6536\u5230\u7684\u4fe1\u53f7\u5f3a\u5ea6\uff0c\u901a\u5e38\u4ee5dBm\u4e3a\u5355\u4f4d\u8868\u793a\u3002RSSI\u503c\u8d8a\u63a5\u8fd1\u96f6\uff0c\u8868\u793a\u4fe1\u53f7\u5f3a\u5ea6\u8d8a\u5927;\u53cd\u4e4b\uff0cRSSI\u503c\u8d8a\u4f4e\uff0c\u8868\u793a\u4fe1\u53f7\u5f3a\u5ea6\u8d8a\u5f31\u3002<\/p>\n\n\n\n
\u3000\u3000RSSI\u503c\u53d7\u5230\u591a\u79cd\u56e0\u7d20\u7684\u5f71\u54cd\uff0c\u5305\u62ec\u4f20\u64ad\u8ddd\u79bb\u3001\u969c\u788d\u7269\u3001\u4fe1\u9053\u5360\u7528\u60c5\u51b5\u4ee5\u53ca\u7269\u7406\u5c42\u53c2\u6570\u5982\u6269\u5c55\u56e0\u5b50(SF)\u3001\u5e26\u5bbd(BW)\u548c\u7f16\u7801\u7387(CR)\u7b49\u3002\u4f8b\u5982\uff0c\u8f83\u9ad8\u7684SF\u503c\u53ef\u4ee5\u63d0\u9ad8\u4fe1\u53f7\u7684\u7075\u654f\u5ea6\u548c\u4f20\u8f93\u8303\u56f4\uff0c\u4f46\u540c\u65f6\u4f1a\u964d\u4f4e\u6570\u636e\u5305\u9519\u8bef\u7387(PER)\u548cRSSI\u503c\u3002\u6b64\u5916\uff0c\u8f83\u9ad8\u7684BW\u53ef\u4ee5\u589e\u52a0\u4f20\u8f93\u8303\u56f4\u548c\u6570\u636e\u901f\u7387\uff0c\u4f46\u4e5f\u4f1a\u5f15\u5165\u989d\u5916\u7684\u566a\u58f0\uff0c\u4ece\u800c\u964d\u4f4e\u7075\u654f\u5ea6\u3002<\/p>\n\n\n\n
\u3000\u3000\u5728\u5b9e\u9645\u5e94\u7528\u4e2d\uff0cRSSI\u503c\u7684\u53d8\u5316\u53ef\u4ee5\u53cd\u6620\u4fe1\u9053\u5360\u7528\u60c5\u51b5\u3002\u5f53\u4fe1\u9053\u4e0a\u5b58\u5728\u8f83\u591a\u7684\u5e72\u6270\u6216\u5360\u7528\u65f6\uff0cRSSI\u503c\u4f1a\u663e\u8457\u4e0b\u964d\u3002\u4f8b\u5982\uff0c\u5728\u4e00\u4e2a\u5b9e\u9a8c\u4e2d\uff0c\u901a\u8fc7\u6539\u53d8SF\u548cCR\u503c\uff0c\u89c2\u5bdf\u5230\u4e0d\u540c\u7684RSSI\u503c\u8868\u73b0\u51fa\u4e86\u4fe1\u9053\u5360\u7528\u60c5\u51b5\u7684\u53d8\u5316\u3002\u5177\u4f53\u6765\u8bf4\uff0c\u8f83\u9ad8\u7684SF\u503c\u53ef\u4ee5\u51cf\u5c11\u5e72\u6270\uff0c\u4ece\u800c\u63d0\u9ad8RSSI\u503c\u3002<\/p>\n\n\n\n
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