3.8 通信接口................................................................................................................................................47 3.8.1 UART...............................................................................................................................................48 3.8.2 I2C 接口...............................................................................................................................................49 3.8.3 SPI 接口.......................................................................................................................................52 3.8.4 USB 接口.......................................................................................................................................53 3.9 预定义 PIO.........................................................................................................................................................54 3.9.1 D_SEL.........................................................................................................................................................54 3.9.2 RESET_N.............................................................................................................................................54 3.9.3 SAFEBOOT_N.........................................................................................................................................54 3.9.4 TIMEPULSE...................................................................................................................................55 3.9.5 TX_READY.....................................................................................................................................55 3.9.6 EXTINT................................................................................................................................................55 3.9.7 GEOFENCE_STAT 接口....................................................................................................56 3.9.8 RTK_STAT 接口...................................................................................................................56 3.10 天线监控器.........................................................................................................................................56 3.10.1 天线电压控制 - ANT_OFF.........................................................................................................57 3.10.2 天线短路检测 - ANT_SHORT_N.........................................................................................57 3.10.3 天线短路检测自动恢复.........................................................................................................58 3.10.4 天线开路检测 - ANT_DETECT.........................................................................................58 3.11 多 GNSS 辅助 (MGA).........................................................................................................................59 3.11.1 授权...........................................................................................................................................59 3.11.2 在断电期间保存 MGA 和运行数据...............................................................................59 3.12 时钟和时间.........................................................................................................................................60 3.12.1 接收机本地时间....................................................................................................................60 3.12.2 导航历元.................................................................................................................................60 3.12.3 iTOW 时间戳.......................................................................................................................61 3.12.4 GNSS 时间....................................................................................................................................61 3.12.5 时间有效性....................................................................................................................................61 3.12.6 UTC 表示法.....................................................................................................................62 3.12.7 闰秒....................................................................................................................................62 3.12.8 实时时钟....................................................................................................................................63 3.12.9 日期.....................................................................................................................................63 3.13 计时功能................................................................................................................................64 3.13.1 时间脉冲....................................................................................................................................64 3.13.2 时间标记....................................................................................................................................67 3.14 安全性.........................................................................................................................................................68 3.14.1 欺骗检测与监控.........................................................................................................................69 3.14.2 干扰和干扰检测与监控.........................................................................................................69 3.14.3 欺骗和干扰指示.........................................................................................................................69 3.14.4 GNSS 接收器安全性.........................................................................................................................69 3.14.5 Galileo 开放服务导航消息认证 (OSNMA)......................................................................70 3.15 u-blox 协议功能描述.........................................................................................................................74 3.15.1 广播导航数据................................................................................................................ 74 3.16 强制重置接收器............................................................................................................................... 82 3.17 固件上传.................................................................................................................................... 82 3.18 频谱分析仪................................................................................................................................. 83 3.19 生产测试....................................................................................................................................... 84 3.19.1 连接灵敏度测试.................................................................................................................... 84 3.19.2 集成设备的通过/不通过测试.................................................................................................... 85