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更新GPS
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# GPS {docsify-ignore-all}
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# Unit GPS {docsify-ignore-all}
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<img src="assets/img/product_pics/module/module_gps_01.png" width="30%" height="30%"> <img src="assets/img/product_pics/module/module_gps_02.png" width="30%" height="30%">
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# GPS {docsify-ignore-all}
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# Unit GPS {docsify-ignore-all}
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<img src="assets/img/product_pics/unit/unit_gps_01.png" width="30%" height="30%"><img src="assets/img/product_pics/unit/unit_gps_02.png" width="30%" height="30%"><img src="assets/img/product_pics/unit/unit_gps_grove_c.png" width="30%" height="30%">
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# GPS - 北斗导航 {docsify-ignore-all}
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# Unit GPS {docsify-ignore-all}
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<img src="assets/img/product_pics/unit/unit_gps_01.png" width="30%" height="30%"><img src="assets/img/product_pics/unit/unit_gps_02.png" width="30%" height="30%"><img src="assets/img/product_pics/unit/unit_gps_grove_c.png" width="30%" height="30%">
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## 描述
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**<mark>GPS</mark>**是一款集成中科微北斗导航芯片 AT6558 和信号放大芯片 MAX2659 的 Unit。AT6558 是车载设备级别的芯片,性能强悍,支持多种卫星导航系统,同时接收六个卫星导航系统的 GNSS 信号,并且实现联合定位、导航和授时,获得准确的全球位置信息。
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**<mark>GPS</mark>**是一款集成中科微北斗导航芯片 AT6558 和信号放大芯片 MAX2659 的 Unit。AT6558 是车载设备级别的芯片,性能强悍,支持多种卫星导航系统,以 56 通道接收卫星信号,同时接收六个卫星导航系统的 GNSS 信号,并且实现联合定位、导航和授时,获得准确的全球位置信息。AT6558 能够在城市、峡谷、高架下面等弱信号的地方,以及汽车内部任何位置可以快速、准确地定位。使得模块可广泛用于车载监控、公交车报站、车载导航、船载导航、笔记本导航等产品上。
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Unit 还内置了信号放大器 **MAX2659**。
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该 Unit 接 M5Core 的 GROVE C(UART) 口之后,M5Core 通过串口与它通讯。
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串口参数:波特率 ( 默认为 9600bps ), 起始位 ( 1位 ), 停止位 ( 1位 ), 校验位 ( 无 )
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## 特性
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- 功能规范
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- 定位精度:2.5米(CEP50,开阔地)
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- 支持BDS/GPS/GLONASS卫星导航系统的单系统定位,或者任意组合的多系统联合定位
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- 最大定位更新频率:10Hz
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- 支持D-GNSS差分定位
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- 通道:56
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- 支持 BDS/GPS/GLONASS 卫星导航系统的单系统定位,或者任意组合的多系统联合定位
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- 支持 D-GNSS 差分定位
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- 定位更新频率:1-10Hz
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- 最大高度:1800 米
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- 最大速度:515 m/s
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- 最大加速度:<= 4 G
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- 低功耗
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- BDS/GPS双模连续运行:<23mA(@3.3V)
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- BDS/GPS 双模连续运行:<23mA(@3.3V)
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- 待机:<10uA(@3.3V)
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- 灵敏度
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- 跟踪:-162dBm
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- 捕捉:-148dBm
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- 冷启动:-146dBm
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- 启动时间
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- 冷启动:35 秒
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- 温启动:32 秒
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- 热启动:1 秒
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- 工作温度:-40~85℃
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<!-- - GROVE接口,支持[UIFlow](http://flow.m5stack.com)编程,[Arduino](http://www.arduino.cc)编程 -->
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- Unit内置两个Lego插件孔,方便与Lego件结合
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- Unit 内置两个 Lego 插件孔,方便与 Lego 件结合
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## 包含
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- 1x GPS Unit
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- 1x Grove 线
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## 应用
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@@ -40,13 +60,13 @@
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- **数据手册** - [AT6558](http://www.icofchina.com/d/file/xiazai/2016-12-05/b1be6f481cdf9d773b963ab30a2d11d8.pdf) - [MAX2659](https://datasheets.maximintegrated.com/en/ds/MAX2659.pdf)
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- **[TinyGPS++库官网](http://arduiniana.org/libraries/tinygpsplus/)**
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- **[TinyGPS++ 库官网](http://arduiniana.org/libraries/tinygpsplus/)**
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- **[AT6558的信息](http://www.icofchina.com/pro/dingwei/2016-07-29/5.html)**
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- **[AT6558 的信息](http://www.icofchina.com/pro/dingwei/2016-07-29/5.html)**
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- **[CASIC多模卫星导航接收机协议规范](http://www.icofchina.com/d/file/xiazai/2017-05-02/ea0cdd3d81eeebcc657b5dbca80925ee.pdf)**
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- **[CASIC 多模卫星导航接收机协议规范](http://www.icofchina.com/d/file/xiazai/2017-05-02/ea0cdd3d81eeebcc657b5dbca80925ee.pdf)**
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- **[上位机软件GnssToolKit3(Windows版本)](http://www.icofchina.com/d/file/xiazai/2018-05-23/2b29a8da746eec0ef1dcd9deae895298.zip)**
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- **[上位机软件 GnssToolKit3(Windows版本)](http://www.icofchina.com/d/file/xiazai/2018-05-23/2b29a8da746eec0ef1dcd9deae895298.zip)**
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## 例程
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}
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```
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烧录例程`GPSRaw.ino`之后,屏幕和串口显示终端会打印如下类似的信息
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烧录例程 `GPSRaw.ino` 之后,屏幕和串口显示终端会打印如下类似的信息
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```
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$GPGSA,A,1,,,,,,,,,,,,,25.5,25.5,25.5*02
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$BDGSA,A,1,,,,,,,,,,,,,25.5,25.5,25.5*13
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$GPGSV,1,1,00*79
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$BDGSV,1,1,00*68
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$GNRMC,,V,,,,,,,,,,M*4E
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$GNVTG,,,,,,,,,M*2D
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$GNZDA,,,,,,*56
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$GNGGA,063012.000,2234.87140,N,11357.22414,E,1,06,4.2,7.3,M,0.0,M,,*7D
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$GNGLL,2234.87140,N,11357.22414,E,063012.000,A,A*4C
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$GPGSA,A,3,01,09,11,18,23,,,,,,,,6.3,4.2,4.7*32
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$BDGSA,A,3,13,,,,,,,,,,,,6.3,4.2,4.7*21
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$GPGSV,3,1,10,01,54,164,33,04,,,22,08,46,019,,09,23,230,24*40
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$GPGSV,3,2,10,11,81,200,12,18,65,110,26,23,14,195,25,27,18,041,*78
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$GPGSV,3,3,10,28,10,300,15,30,33,319,*7C
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$BDGSV,1,1,01,13,43,195,29*5A
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$GNRMC,063012.000,A,2234.87140,N,11357.22414,E,0.69,171.74,240419,,,A*7A
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$GNVTG,171.74,T,,M,0.69,N,1.27,K,A*2C
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$GNZDA,063012.000,24,04,2019,00,00*46
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$GPTXT,01,01,01,ANTENNA OPEN*25
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```
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**分析:**
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**$GNRMC,063012.000,A,2234.87140,N,11357.22414,E,0.69,171.74,240419,,,A*7A**
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表示定位信息为 UTC 时间为 06 时 30 分 12 秒,北纬 22.58119°,东经 113.95357°,日期为 2019 年 04 月 24 日
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<img src="assets/img/product_pics/unit/gps/unit_gps_06.png">
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<img src="assets/img/product_pics/unit/gps/unit_gps_05.png">
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## 原理图
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<img src="assets/img/product_pics/unit/gps_sch.png">
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@@ -101,6 +136,6 @@ $GPTXT,01,01,01,ANTENNA OPEN*25
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### 管脚映射
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<table>
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<tr><td>M5Core(GROVE接口C)</td><td>ESP32串口2接收引脚U2RXD(GPIO16)</td><td>ESP32串口2发送引脚U2TXD(GPIO17)</td><td>5V</td><td>GND</td></tr>
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<tr><td>北斗导航Unit</td><td>信号发送引脚TXD</td><td>信号接收引脚RXD</td><td>5V</td><td>GND</td></tr>
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<tr><td>M5Core (GROVE 接口 C)</td><td>ESP32 串口 2 接收引脚 U2RXD(GPIO16)</td><td>ESP32 串口 2 发送引脚 U2TXD(GPIO17)</td><td>5V</td><td>GND</td></tr>
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<tr><td>北斗导航 Unit</td><td>信号发送引脚 TXD</td><td>信号接收引脚 RXD</td><td>5V</td><td>GND</td></tr>
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</table>
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