LEA-4T 现货供应，输出原始数据
LEA-5T 专业授时模块
LEA-4T是u-blox最新推出专业GPS授时系列的产品,最大的优势是在一颗星的情况下也能稳定收到GPS的信号并假定一个静态的3D定位,时间脉冲的精度达50ns,与GPS或UTC的时间同步,通过使用量化误差信息补偿时间脉冲间隔可以获得15ns的精确度.LEA-4T也支持原始测量(半循环双值载波相信,编码相位和多普勒测量),这种原始的数据输出多用于专业测量仪器的原始数据输出,如时间,坐标,高度,可以获得比普通GPS更高的精度,当然它的原理极为复杂,工作原理及工作频段不同于普通的GPS,但授时及测量专业使用的GPS反映速度是要偏慢于普通的GPS,仅仅用于工程测量或是电信设备的授时信号发生器专业用户.
The LEA-4T, supporting precision GPS timing and raw measurement data for demanding positioning applICations, provides high sensitivity, exceptionally low power consumption and USB connectivity.
The LEA-4T features a Time Mode function whereby the GPS receiver assumes a stationary 3D position, whether programmed manually or determined by an initial self-survey. Stationary operation enables GPS timing with only one visible satellite and eliminates timing errors which otherwise result from positioning errors. The accuracy of the time pulse is as good as 50 ns, synchronized to GPS or UTC time. An accuracy of 15 ns is achievable by using the quantization error information to compensate the granularity of the time pulse. The built-in 2-channel time mark and counter unit provides precise time measurement of external signals (EXTINT0 and 1).
The LEA-4T also supports raw measurement data (carrier phase with half-cycle ambiguity resolved, code phase and Doppler measurements) which can be used in external applications that offer precision positioning, real-time kinematics (RTK) and attitude sensing.
Stationary Mode for GPS timing operation
15 ns timing accuracy (error compensated)
1-Satellite GPS timing
10 Hz raw measurement data output
Flash EPROM: programmable and configurable
Indoor GPS, -158 dBm
16 channel ANTARIS 4 positioning engine
Supports DGPS, WAAS, EGNOS and MSAS
4 Hz position update rate
Configurable time pulse: 0.1 Hz - 1 KHz
Ultra low power consumption
2 channel precision time mark / counter
Supports A-GPS services includingOnline
1 USB and 1 UART ports
Configurable I/O and UART voltage levels
Supports passive and active antennas
Antenna short and open circuit detection and protection
Power brown-out protection: No external reset hardware needed
Operating temperature range: -40 to 85°C
RoHS compliant (lead-free)