C3-270AL/C3-270BL特点Features：◆内置GPS***，保护罩◆完全的SiRFstarIIIGPS结构◆GSC3F/LP高性能GPS单芯片◆GPSDSP以及内置RTC时钟的ARM7TDMICPU处理器◆4MbitFLASH存储空间◆低噪声运放和SAW滤波器◆温度补偿晶体振荡器,Reset和校准器等功能◆内置备用电池尺寸SIze(mm)：◆天线Antenna:18x18x4◆模块Module:18.0x18x48.6C3-270AL/C3-270BL特性Speciality：◆6pin,42mA◆C3-270AL:模块电压DCsupply5V可以外接天线CancontactAntenna◆C3-270BL:模块电压DCsupply4.2V不支持外接天线CannotcontactAntenna性能参数PerformanceParameter：◆Receivertype:L1frequency,C/ACode,20-channel◆Maxup-daterate:1sec◆Accuracy(SAoff):Position<10m3DRMS◆3DTrackingSensitivity:-156dBmatthereceiverinput(typical)◆OperationalLimits:Altitude<18,000m(60,000ft)Velocity<515m/s(1,000knots)◆ColdStart60sec(typical)◆WarmStart40sec(typical)◆HotStart<3sec(typical)◆4MbitFLASHmemory)