测试物料：
1、EC20开发板
（新用户不给发图）
2、自己做的EC20 CE FILG主板
3、无源FPC天线 5dbi
（新用户不给发图）
测试环境：
窗台边
启动方式：
强制冷启动
接线方式
开发板通过USB连接电脑串口工具
自己做的EC20板通过USB连接到海思3518开发板
测试结果：
1、EC20开发板连接电脑的串口工具后，开启GPS NMEA数据，可以在2分钟内搜到卫星并成功定位
断电10s后再上电依然可以在2分钟内定位，重复5次结果相同。
$GNGSA,A,1,,,,,,,,,,,,,25.5,25.5,25.5,1*01
$GNGSA,A,1,,,,,,,,,,,,,25.5,25.5,25.5,4*04
$GPGSV,2,1,07,03,,,26,18,,,37,26,57,028,35,29,,,34,0*5D
$GPGSV,2,2,07,31,,,35,194,,,31,195,,,31,0*67
$BDGSV,1,1,03,12,,,37,24,,,32,25,,,33,0*70
$GNRMC,094459.000,V,,,,,,,291121,,,M,V*27
$GNVTG,,,,,,,,,M*2D
$GNZDA,094459.000,29,11,2021,00,00*47
$GPTXT,01,01,01,ANTENNA OPEN*25
$GNGGA,094500.000,,,,,0,00,25.5,,,,,,*72
$GNGLL,,,,,094500.000,V,M*6F
$GNGSA,A,1,,,,,,,,,,,,,25.5,25.5,25.5,1*01
$GNGSA,A,1,,,,,,,,,,,,,25.5,25.5,25.5,4*04
$GPGSV,2,1,07,03,,,25,18,,,37,26,57,028,34,29,,,33,0*58
$GPGSV,2,2,07,31,,,35,194,,,31,195,,,31,0*67
$BDGSV,1,1,03,12,,,37,24,,,32,25,,,33,0*70
$GNRMC,094500.000,V,,,,,,,291121,,,M,V*2A
$GNVTG,,,,,,,,,M*2D
$GNZDA,094500.000,29,11,2021,00,00*4A
$GPTXT,01,01,01,ANTENNA OPEN*25
$GNGGA,094501.002,3550.22078,N,11121.83681,E,6,05,4.4,20.0,M,0.0,M,,*43
$GNGLL,3550.22078,N,11121.83681,E,094501.002,A,E*42
$GNGSA,A,3,18,26,29,194,195,,,,,,,,5.4,4.4,3.1,1*35
$GNGSA,A,3,,,,,,,,,,,,,5.4,4.4,3.1,4*37
$GPGSV,2,1,07,03,,,25,18,08,085,37,26,57,028,34,29,03,034,33,0*59
$GPGSV,2,2,07,31,,,33,194,69,051,31,195,40,136,31,0*6A
$BDGSV,1,1,03,12,,,37,24,,,32,25,,,33,0*70
$GNRMC,094501.002,A,3550.22078,N,11121.83681,E,0.56,0.00,291121,,,E,V*04
$GNVTG,0.00,T,,M,0.56,N,1.03,K,E*26
$GNZDA,094501.002,29,11,2021,00,00*49
$GPTXT,01,01,01,ANTENNA OPEN*25
$GNGGA,094502.000,3550.22090,N,11121.83685,E,1,05,4.4,19.9,M,0.0,M,,*44
$GNGLL,3550.22090,N,11121.83685,E,094502.000,A,A*45
$GNGSA,A,3,18,26,29,194,195,,,,,,,,5.4,4.4,3.1,1*35
$GNGSA,A,3,,,,,,,,,,,,,5.4,4.4,3.1,4*37
$GPGSV,2,1,07,03,,,25,18,08,085,36,26,57,028,35,29,03,034,33,0*59
$GPGSV,2,2,07,31,,,33,194,69,051,31,195,40,136,31,0*6A
$BDGSV,1,1,03,12,,,37,24,,,32,25,,,33,0*70
$GNRMC,094502.000,A,3550.22090,N,11121.83685,E,0.60,0.00,291121,,,A,V*06
$GNVTG,0.00,T,,M,0.60,N,1.11,K,A*24
$GNZDA,094502.000,29,11,2021,00,00*48
$GPTXT,01,01,01,ANTENNA OPEN*25
$GNGGA,094503.000,3550.22124,N,11121.83696,E,1,05,4.4,19.9,M,0.0,M,,*49
$GNGLL,3550.22124,N,11121.83696,E,094503.000,A,A*48
$GNGSA,A,3,18,26,29,194,195,,,,,,,,5.4,4.4,3.1,1*35
$GNGSA,A,3,,,,,,,,,,,,,5.4,4.4,3.1,4*37
$GPGSV,2,1,07,03,,,18,18,08,085,36,26,57,028,35,29,03,034,32,0*56
$GPGSV,2,2,07,31,,,31,194,69,051,31,195,40,136,31,0*68
$BDGSV,1,1,03,12,,,37,24,,,32,25,,,33,0*70
$GNRMC,094503.000,A,3550.22124,N,11121.83696,E,0.22,0.00,291121,,,A,V*0D
$GNVTG,0.00,T,,M,0.22,N,0.41,K,A*26
$GNZDA,094503.000,29,11,2021,00,00*49
$GPTXT,01,01,01,ANTENNA OPEN*25
$GNGGA,094504.000,3550.22168,N,11121.83704,E,1,05,4.4,19.9,M,0.0,M,,*4C
2、自己做的EC20板 通过海思读取USB的NMEA数据，可以搜到卫星数据但是始终无法定位，等待市场超过10分钟。
$GNRMC,094711.000,V,,,,,,,,,,M,V*20
$GNVTG,,,,,,,,,M*2D
$GNZDA,094711.000,,,,,*42
$GPTXT,01,01,01,ANTENNA OPEN*25
$GNGGA,094712.000,,,,,0,00,25.5,,,,,,*73
$GNGLL,,,,,094712.000,V,M*6E
$GNGSA,A,1,,,,,,,,,,,,,25.5,25.5,25.5,1*01
$GNGSA,A,1,,,,,,,,,,,,,25.5,25.5,25.5,4*04
$GPGSV,2,1,07,04,,,25,18,08,084,32,26,56,029,36,29,,,26,0*68
$GPGSV,2,2,07,31,,,33,194,69,051,30,195,,,26,0*5D
$BDGSV,1,1,03,24,16,082,32,25,,,35,44,12,042,36,0*7C
$GNRMC,094712.000,V,,,,,,,,,,M,V*23
$GNVTG,,,,,,,,,M*2D
$GNZDA,094712.000,,,,,*41
$GPTXT,01,01,01,ANTENNA OPEN*25
$GNGGA,094713.000,,,,,0,00,25.5,,,,,,*72
$GNGLL,,,,,094713.000,V,M*6F
$GNGSA,A,1,,,,,,,,,,,,,25.5,25.5,25.5,1*01
$GNGSA,A,1,,,,,,,,,,,,,25.5,25.5,25.5,4*04
$GPGSV,2,1,07,04,,,25,18,08,084,32,26,56,029,36,29,,,26,0*68
$GPGSV,2,2,07,31,,,33,194,69,051,30,195,,,26,0*5D
$BDGSV,1,1,03,24,16,082,32,25,,,35,44,12,042,36,0*7C
$GNRMC,094713.000,V,,,,,,,,,,M,V*22
$GNVTG,,,,,,,,,M*2D
$GNZDA,094713.000,,,,,*40
$GPTXT,01,01,01,ANTENNA OPEN*25
$GNGGA,094714.000,,,,,0,00,25.5,,,,,,*75
$GNGLL,,,,,094714.000,V,M*68
$GNGSA,A,1,,,,,,,,,,,,,25.5,25.5,25.5,1*01
$GNGSA,A,1,,,,,,,,,,,,,25.5,25.5,25.5,4*04
$GPGSV,2,1,07,04,,,25,18,08,084,36,26,56,029,36,29,,,23,0*69
$GPGSV,2,2,07,31,,,33,194,69,051,30,195,,,26,0*5D
$BDGSV,1,1,03,24,16,082,32,25,,,35,44,12,042,36,0*7C
$GNRMC,094714.000,V,,,,,,,,,,M,V*25
$GNVTG,,,,,,,,,M*2D
$GNZDA,094714.000,,,,,*47
$GPTXT,01,01,01,ANTENNA OPEN*25
$GNGGA,094715.000,,,,,0,00,25.5,,,,,,*74
$GNGLL,,,,,094715.000,V,M*69
$GNGSA,A,1,,,,,,,,,,,,,25.5,25.5,25.5,1*01
$GNGSA,A,1,,,,,,,,,,,,,25.5,25.5,25.5,4*04
$GPGSV,2,1,08,03,13,250,,04,43,307,25,18,08,084,36,26,56,029,36,0*69
$GPGSV,2,2,08,29,,,23,31,,,33,194,69,051,30,195,,,26,0*58
$BDGSV,1,1,03,24,16,082,32,25,59,031,35,44,12,042,36,0*42
$GNRMC,094715.000,V,,,,,,,291121,,,M,V*2C
$GNVTG,,,,,,,,,M*2D
$GNZDA,094715.000,29,11,2021,00,00*4C
$GPTXT,01,01,01,ANTENNA OPEN*25
$GNGGA,094716.000,,,,,0,00,25.5,,,,,,*77
$GNGLL,,,,,094716.000,V,M*6A
$GNGSA,A,1,,,,,,,,,,,,,25.5,25.5,25.5,1*01
$GNGSA,A,1,,,,,,,,,,,,,25.5,25.5,25.5,4*04
$GPGSV,2,1,08,03,13,250,,04,43,307,23,18,08,084,37,26,56,029,36,0*6E
$GPGSV,2,2,08,29,,,23,31,,,33,194,69,051,30,195,,,26,0*58
$BDGSV,1,1,03,24,16,082,31,25,59,031,35,44,12,042,36,0*41
$GNRMC,094716.000,V,,,,,,,291121,,,M,V*2F
$GNVTG,,,,,,,,,M*2D
$GNZDA,094716.000,29,11,2021,00,00*4F
$GPTXT,01,01,01,ANTENNA OPEN*25
$GNGGA,094717.000,,,,,0,00,25.5,,,,,,*76
$GNGLL,,,,,094717.000,V,M*6B
$GNGSA,A,1,,,,,,,,,,,,,25.5,25.5,25.5,1*01
$GNGSA,A,1,,,,,,,,,,,,,25.5,25.5,25.5,4*04
$GPGSV,2,1,08,03,13,250,,04,43,307,23,18,08,084,39,26,56,029,37,0*61
$GPGSV,2,2,08,29,,,23,31,,,33,194,69,051,30,195,,,25,0*5B
$BDGSV,1,1,03,24,16,082,31,25,59,032,36,44,12,042,36,0*41
$GNRMC,094717.000,V,,,,,,,291121,,,M,V*2E
$GNVTG,,,,,,,,,M*2D