Quectel_EC20_GNSS_AT_Commands_Manual_V1.1(1)

　　EC20是移遠(yuǎn)通信最近推出的LTE模塊，采用LTE 3GPP Rel.9技術(shù)，支持最大下行速率100Mbps和最大上行速率50Mbps，同時(shí)在封裝上兼容移遠(yuǎn)通信UMTS/HSPA+ UC20模塊，實(shí)現(xiàn)了從3G網(wǎng)絡(luò)向4G網(wǎng)絡(luò)輕松平滑過(guò)渡。EC20系列模塊包含EC20-A，EC20-C和EC20-E三個(gè)版本，使其能夠向后兼容現(xiàn)存的EDGE和GSM/GPRS網(wǎng)絡(luò)，以確保在缺乏3G和4G網(wǎng)絡(luò)的偏遠(yuǎn)地區(qū)也能正常工作。

1.1. How to Use GNSS EC20 GNSS engine allows calculating location without any assistance from the network. The procedure of turning on GNSS is shown as below： Step 1： Configure corresponding demands by AT+QGPSCFG. Step 2： Active GNSS engine by AT+QGPS. Step 3： After GNSS session is started successfully and GNSS has fixed， positioning information can be obtained by three ways： 1） NMEA sentences output to “usbnmea” port by default， you can read the port to obtain NMEA sentences. 2） You can use AT+QGPSLOC to obtain some positioning information directly， such as latitude， longitude， height， time and positioning type and so on 。 3） After enabling by AT+QGPSCFG， you can acquire the specified NMEA sentence by AT+QGPSGNMEA. If is disabled， this command cannot be used.