该GPS芯片工作电压的范围为2.7~3.6 V,在实际设计中采用AMS117—3.3为其提供3.3 V稳定电源。其定位数据支持NMEA-0183协议和UBX二进制。如图3所示为GPS模块电路原理图。
基于RFID、GPS、GPRS的物流追踪系统的研制
NEO-5Q的TXD引脚和RXD引脚分和STM32F103RBT6的RXD2和TXD2连接在一起。该模块支持UART、USB、I2C和SPI接口的数据输入输出,其中UART默认波特率为9 600,8位数据位,无奇偶校验位。NEO-5Q能够提供达4 Hz的定位跟新速率,其定位跟新速率和定位数据输出格式均可使用软件进行设置。在本设计考虑到实用性和低功耗的原则,设置其定位跟新速率为1 Hz,输出协议为NMEA-0183,输出格式为GPRMC(建议使用最小GPS定位信息)。GPS芯片在搜索到有效卫星情况下,还能够为系统提供精确地授时服务。
2.1.3 GPRS模块设计分析
车载终端选用的GPRS通信模块是西门子的MC52i,该模块是一款双频的GSM/GPRS模块,内嵌TCP/IP协议栈;具有快速GPRS技术,该模块体积小、重量轻、功耗低,支持数据、语音、短信息和传真等功能,AT命令控制符合GSM07.05,工作频率在900/1 800 MHz。
MC52i支持的电压范围是3.3~4.4 V,电流消耗在睡眠状态是3.0 mA,在闲置的状态下是10.0μA,在通话状态下电流消耗是300 mA,最高时可达到2.0 A,在掉电状态下电流仅为100μA。功率在900 MHz时是2 W,在1 800 MHz时是1 W。数据特征为CSD最大达到14.4 kbps、USSD、不透明模式。该模块使用方便具备电源接口,1.8 V/3.0 V SIM卡接口,全双工UART接口,TTL输出,50欧姆天线连接器。
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