公开(公告)号：EP1451605A2

公开(公告)日：2004-09-01

申请号：EP02776367.1

申请日：2002-10-30

申请人： SiRF Technology, Inc.

发明人： GRONEMEYER, Steven, A.

IPC分类号： G01S3/16

CPC分类号： G04G19/12 ,  G01S19/23 ,  G01S19/235 ,  G01S19/34 ,  G04C10/04 ,  G04F5/00 ,  G06F1/14 ,  G06F1/3203 ,  Y02D10/126

摘要： Power is conserved in a Global Positioning System (GPS) receiver by shutting down selected components during periods when the GPS receiver is not actively calculating the GPS receiver location. A low power time keeping circuit accurately preserves GPS time when the selected components are deactivated. When the selected components are turned on in response to a wake-up command, time provided from the low power time keeping circuit, corrected for actual operating temperatures, and data from the GPS clock temperature/frequency table, are used to recalibrate time from a GPS oscillator. Positions of the GPS satellites are then estimated such that the real GPS time is quickly determined from the received satellite signals. Once real GPS time is determined from the detected satellite signals, the selected components are deactivated. The process described above is repeated such that accurate GPS time is maintained by the low power time keeping circuit.

公开(公告)号：EP1437014A2

公开(公告)日：2004-07-14

申请号：EP02770497.2

申请日：2002-09-10

申请人： SiRF Technology, Inc.

发明人： PANDE, Ashutosh ,  GARIN, Lionel, Jacques

IPC分类号： H04Q7/20

CPC分类号： G01S19/256 ,  G01S5/0252 ,  G01S19/06 ,  G01S19/252 ,  H04M2250/10 ,  H04W4/02 ,  H04W64/00

摘要： A system is described that utilizes the measured characteristics of a cell site or a plurality of cell sites (100, 102, 104) and the cellular identification to selectively provide a wireless device (118) with location aiding from a cellular network server (120). The system may include a basestation (106, 108, 110) located within the cell site, a cellular measurement unit located in the wireless device (118), and a database (214) containing positional assistance information corresponding to the characteristic information. The system may also include a processing unit in signal communication with the basestation and the database (214) and a positional determination unit in the wireless device (118).

公开(公告)号：EP1311870A1

公开(公告)日：2003-05-21

申请号：EP01954865.0

申请日：2001-07-20

申请人： SiRF Technology, Inc.

发明人： TURETZKY, Gregory, Bret ,  NORMAN, Charles, P. ,  FALK, Henry, D.

IPC分类号： G01S1/04 ,  G01S5/14 ,  H04B1/707

CPC分类号： G01S19/37 ,  G01S5/0027 ,  G01S5/0036 ,  G01S19/09 ,  G01S19/21 ,  G01S19/25 ,  G01S19/26 ,  G01S19/30 ,  H04B1/7075 ,  H04B1/70755 ,  H04B1/708 ,  H04B1/7085 ,  H04B1/709 ,  H04B1/7097 ,  H04B2201/70715

摘要： The present invention discloses methods, apparatuses, and systems for eliminating auto- and cross-correlation in weak signal CDMA systems, such as GPS systems. The invention uses parallel data paths that allow standard correlation of signals in parallel with verification of the lock signal to determine whether the system has locked onto the proper signal within the scanned signal window. The invention can be made with multiple CPUs, a single CPU with dual input modes, on multiple IC chips, or as a single IC chip solution for small, low cost reception, downconversion, correlation, and verification systems.

公开(公告)号：EP2087367A2

公开(公告)日：2009-08-12

申请号：EP07871314.6

申请日：2007-10-31

申请人： SiRF Technology, Inc.

发明人： GARIN, Lionel J. ,  BOERYD, Lars ,  PHATAK, Makarand S.

IPC分类号： G01S1/00

CPC分类号： G01S19/27

摘要： Devices and methods are described for determining position information without broadcast ephemeris data for extended time periods. A client device is disclosed that stores satellite states determined from broadcast ephemeris and numerically integrates equations of motion with regard to the stored satellite states to determine current satellites states. The client device uses the current satellite states in conjunction with received satellite signals to determine where the satellite signals were received.

公开(公告)号：EP2041596A2

公开(公告)日：2009-04-01

申请号：EP07812528.3

申请日：2007-06-29

申请人： Sirf Technology, Inc.

发明人： WAN, Marlene ,  GARIN, Lionel ,  ZHANG, Gengsheng

IPC分类号： G01S1/00 ,  G01S5/14

CPC分类号： G01S19/48 ,  G01C21/206 ,  G01S19/05

摘要： An Aided Location Communication System ('ALCS') is described. The ALCS may include a geolocation server including a non-GPS position server, at least one server aiding database, server position-determination module, and a server fusion module. The ALCS may also include an Aided Location Communication Device ('ALCD') including a communication section in signal communication with the geolocation server, and a position-determination section having a GPS Engine.

公开(公告)号：EP1187576B1

公开(公告)日：2009-03-25

申请号：EP00932563.0

申请日：2000-05-18

申请人： SiRF Technology, Inc.

发明人： EDISON, Donald, Brian

IPC分类号： H04B1/707 ,  H04L27/30

CPC分类号： H04W48/20 ,  H04B2201/70701 ,  H04B2201/70702

摘要： A mobile wireless transceiver (12) selects one of multiple nearby base stations (14A-14D) to facilitate communication over a wireless network. Each base station transmits a pilot signal that includes a spreading signal transmitted at one of many possible phase offsets. The wireless transceiver (12) selects an initial one of possible phase offsets of the spreading signal (36) and then correlates a received signal against the spreading signal at consecutive ones of the possible phase offsets (32). Correlation begins at the selected initial phase offset and continues until a component of the received signal and the spreading signal (34) are aligned, indicating the detection of the pilot signal from one of the base stations. The transceiver (12) then selects a non-consecutive one of the possible phase offsets of the spreading signal (34) and correlates (32) the received signal against the spreading signal at this non-consecutive phase offset (36) to determine whether any other component of the received signal is aligned with the spreading signal (34) at the selected non-consecutive phase offset.

公开(公告)号：EP1952173A2

公开(公告)日：2008-08-06

申请号：EP06851455.3

申请日：2006-10-28

申请人： SiRF Technology, Inc.

发明人： ZHANG, Gengsheng ,  ZHANG, Qingwen ,  UNDERBRINK, Paul

IPC分类号： G01S1/00

CPC分类号： G01S19/05 ,  G01S19/37

摘要： Satellite positioning system (SATPS) receiver that has a plurality of modes and channels, where a timeline module configures the channels based on the mode of operation of the SATPS receiver and reconfigures the channels if the mode of operation of the SATPS changes.

公开(公告)号：EP1812805A1

公开(公告)日：2007-08-01

申请号：EP05812678.0

申请日：2005-10-18

申请人： SiRF Technology, Inc.

发明人： PANDE, Ashutosh ,  CHANG, Steve ,  GARIN, Lionel, Jacques ,  ZHANG, Qiuye, John

IPC分类号： G01S1/00

CPC分类号： G01S19/37 ,  G01S19/05 ,  G01S19/07 ,  G01S19/256 ,  G01S19/258 ,  H04B7/2693

摘要： A shuttle message that is passed between GPS enabled devices that is processed at either a bit level or word level with data that the GPS enable device has already gathered and augmenting the positioning data stored at GPS enabled devices by retrieving data contained in the shuttle message. The shuttle message is then passed with any updated information from a GPS enabled device to one or more other devices such as a mobile station.

公开(公告)号：EP1277286B1

公开(公告)日：2007-06-13

申请号：EP01924707.1

申请日：2001-04-05

申请人： SiRF Technology, Inc.

发明人： UNDERBRINK, Paul, A.

IPC分类号： H04B1/38

CPC分类号： H03L7/081 ,  G01S19/235 ,  H03L7/1976

摘要： The invention is directed to a personal telecommunications device having both global positioning systems (GPS) and telecommunications provisions which share a common clock source. GPS provisions include a feedback loop for controlling an oscillator that generates a GPS system signal based upon the common clock signal. The feedback loop includes a frequency synthesizer for generating a feedback control signal, a phase comparator for generating a control signal in accordance with the feedback signal and the common clock signal, and a loop filter for processing and outputting the control signal to the oscillator to control the frequency of GPS system signals.

摘要翻译： 本发明针对具有共享公共时钟源的全球定位系统（GPS）和电信设备的个人电信设备。 GPS设备包括用于控制基于公共时钟信号生成GPS系统信号的振荡器的反馈回路。 反馈回路包括用于产生反馈控制信号的频率合成器，用于根据反馈信号和公共时钟信号产生控制信号的相位比较器以及用于处理和输出控制信号给振荡器以控制 GPS系统信号的频率。

公开(公告)号：EP1783511A2

公开(公告)日：2007-05-09

申请号：EP07003033.3

申请日：2002-02-05

申请人： SiRF Technology, Inc.

发明人： King, Thomas Michael

IPC分类号： G01S1/00

CPC分类号： G01S19/29 ,  G01S19/28 ,  G01S19/37

摘要： A method of minimizing a GPS satellite search time in a GPS receiver is provided according to the invention. The method comprises the steps of computing initial conditions that estimate a position of said GPS receiver and that estimate a GPS receiver clock accuracy, computing an initial range estimate, and computing an optimum satellite search order, with said optimum satellite search order computed so as to minimize a search space and minimize a search time needed to find visible GPS satellites.

摘要翻译： 根据本发明提供了一种在GPS接收机中最小化GPS卫星搜索时间的方法。 该方法包括以下步骤：计算估计所述GPS接收机的位置并估计GPS接收机时钟精度，计算初始距离估计以及计算最佳卫星搜索顺序的初始条件，所述最佳卫星搜索顺序被计算为 最小化搜索空间并最大限度地减少查找可见GPS​​卫星所需的搜索时间。