MC20模块软硬件设计资料+模块Protel99se（Pads9.5）原理图库PCB封装文件， Quectel_MC20_AT_Commands_Manual_V1.1.pdf Quectel_MC20_GNSS_AGPS_应用指导_V1.1.pdf Quectel_MC20_GNSS_AT_Commands_Manual_V1.1.pdf Quectel_MC20_GNSS_Protocol_Specification_V1.0.pdf MC20_Footprint_&Part_20160531 Quectel_GNSS_Patch_Antenna_Module_Design_Guide_V1.1.pdf Quectel_MC20_参考设计手册_Rev.A_20160801.pdf Quectel_MC20_硬件设计手册_V1.1.pdf