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    • 2. 发明申请
    • SYSTEM, METHOD AND COMPUTER PROGRAM FOR ULTRA FAST TIME TO FIRST FIX FOR A GNSS RECEIVER
    • 用于GNSS接收机的第一个固件的超快时间的系统,方法和计算机程序
    • US20120293366A1
    • 2012-11-22
    • US13575512
    • 2011-01-27
    • Zhe LiuFrancis Yuen
    • Zhe LiuFrancis Yuen
    • G01S19/43
    • G01S19/24G01S19/31G01S19/42
    • The present invention provides a system, method and computer program for a GNSS receiver that is operable to provide an ultra fast Time To First Fix (TTFF). The invention is implementable without requiring the decoding of a navigation message transmitted by GNSS satellite systems. The system of the present invention may comprise a parameter obtaining means, a clock obtaining means and a Fast TTFF engine. The parameter obtaining means may obtain satellite parameters of one or more GNSS satellites. The clock obtaining means may obtain a clock for estimating a GNSS time tag. The Fast TTFF engine may be linkable to a signal interface that is operable to provide I/Q samples from a GNSS antenna. The Fast TTFF engine may comprise a measurement generation utility, a coarse search utility and a fine search utility. The measurement generation utility may compute the Doppler frequency shift and the code phase of the one or more GNSS satellites based on the I/Q samples.
    • 本发明提供了一种用于GNSS接收机的系统,方法和计算机程序,其可操作以提供超快速的首次定时(TTFF)。 本发明是可实现的,而不需要对由GNSS卫星系统发送的导航消息进行解码。 本发明的系统可以包括参数获取装置,时钟获取装置和快速TTFF引擎。 参数获取装置可以获得一个或多个GNSS卫星的卫星参数。 时钟获取装置可以获得用于估计GNSS时间标签的时钟。 快速TTFF引擎可以链接到可操作以从GNSS天线提供I / Q采样的信号接口。 快速TTFF引擎可以包括测量生成实用程序,粗略搜索实用程序和精细搜索实用程序。 测量生成实用程序可以基于I / Q采样来计算一个或多个GNSS卫星的多普勒频移和码相位。
    • 9. 发明申请
    • Level shifter circuit
    • 电平移位电路
    • US20070001740A1
    • 2007-01-04
    • US11455711
    • 2006-06-20
    • Meng-Jyh LinMing-Zhe Liu
    • Meng-Jyh LinMing-Zhe Liu
    • H03L5/00
    • H03K3/356113
    • A level shifter circuit includes a level shifter unit and a latch unit. The level shifter unit receives two complementary input signals and converts the voltage levels of two complementary input signals. The latch unit latches the state of two output nodes before the low voltage supply is turned off. On condition that the low voltage supply is off, the level shifter circuit avoids current drainage and ensures the voltage level of the output. The invention has the advantages of small circuit size and being easy to design.
    • 电平移位器电路包括电平移位器单元和锁存单元。 电平移位器单元接收两个互补输入信号并转换两个互补输入信号的电压电平。 在低电压电源关闭之前,锁存单元锁存两个输出节点的状态。 在低电压电源关闭的情况下,电平转换器电路避免了电流引流,并确保了输出的电压电平。 本发明具有电路尺寸小,易于设计的优点。