-
公开(公告)号：JP2001208825A
公开(公告)日：2001-08-03
申请号：JP2000343675
申请日：2000-11-10
Applicant: MOTOROLA INC
Inventor： KING THOMAS M , GEIER GEORG J , ZHAO YILIN , HART ROGER C
Abstract: PROBLEM TO BE SOLVED: To provide an improved method and device for assisting position specifying in a radio communication system. SOLUTION: This is a cellular network protocol for minimizing a data flow required between a cellular infrastructure for supporting a GPS-based position determining function and each mobile hand set. Four concrete novel technology are introduced to minimize the number of bits required to be transmitted to the respective hand sets. Those are a method for reducing or eliminating a requisite as to a GPS ephemeris update for the each mobile station, a method for compressing a difference correcting broadcast message, a method for controlling a speed for updating an ephemeris of the each hand set by the network based on an ephemeris date limit, and a method utilized for determining, by the each mobile station, that the ephemeris update is required, based on precision prediction and a threshold value peculiar to the each mobile station, when the update is required.
-
公开(公告)号：WO2004062240A3
公开(公告)日：2004-10-07
申请号：PCT/US0337960
申请日：2003-11-20
Applicant: MOTOROLA INC
Inventor： KING THOMAS M , GEIER GEORGE J
CPC classification number: G01S19/30 , G01S5/0221
Abstract: A method (500) and a mobile station (160) for determining a code phase are described herein. The mobile station (160) may generate a first auto correlation function (ACF) associated with correlation samples over a range of code phases corresponding to a line-of-sight signal. The mobile station (160) may generate a second ACF within the mobile station based on measured correlation samples over a range of code phases. The mobile station (160) may compare the first ACF to the second ACF to generate a code phase offset between the first and second ACFs. The mobile station (160) may adjust the first ACF to match the second ACF.
Abstract translation: 这里描述了用于确定码相位的方法（500）和移动台（160）。 移动台（160）可以产生与对应于视线信号的码相位范围上的相关样本相关联的第一自相关函数（ACF）。 移动台（160）可以基于在一定范围的码相位上测量的相关样本来生成移动台内的第二ACF。 移动台（160）可以将第一ACF与第二ACF进行比较以生成第一ACF和第二ACF之间的码相位偏移。 移动台（160）可以调整第一ACF以匹配第二ACF。
-
公开(公告)号：AU2003222007A8
公开(公告)日：2003-11-17
申请号：AU2003222007
申请日：2003-03-17
Applicant: MOTOROLA INC
Inventor： KIAEI SAYFE , KING THOMAS M , GEIER GEORGE J
Abstract: A method (50) for correcting oscillator frequency error in GPS signal acquisition includes a first step (52) of receiving at least one broadcasted GPS signal. A next step (54) includes estimating a plurality of Doppler offsets. A next step (56) includes correlating the signal to produce a Doppler modulation for each of the plurality of Doppler estimates. A next step (58) includes calculating a magnitude separation of peak and null states of each modulation. A next step (60) includes searching the peak and null separation to finding the Doppler estimate producing the largest magnitude separation in peak and null states. The found Doppler estimate defines a frequency error estimate for the at least one broadcasted GPS signal, which will be common across all satellites.
-
公开(公告)号：GB2358977B
公开(公告)日：2003-07-30
申请号：GB0100619
申请日：2001-01-10
Applicant: MOTOROLA INC
Inventor： KING THOMAS M , GEIER GEORGE J , ZHAO YILIN
IPC: G01S19/27 , G01C21/00 , G01S1/00 , G01S5/00 , G01S5/14 , G01S19/07 , G01S19/08 , G01S19/20 , H04Q7/34 , H04Q7/38 , G01S1/02
Abstract: A cellular network protocol that maintains the reliability of assisted GPS based positioning is taught. An Integrity Monitor (IM) informs mobile stations, their users, or networks of measurement quality and it warns them of failing and failed GPS satellites by isolating them from the effects of these failures. Whenever an unhealthy satellite is detected, its corresponding assistance data will be excluded for delivery or for position determination. In other words, there are two specific aspects to the Integrity Monitor (IM). For DGPS users, it predicts the reliability or quality of the DGPS corrections. For all users, it isolates the mobile position calculation from the effects of GPS satellite failures. The UDRE parameter, nominally output by a reference DGPS receiver, is used to communicate the DGPS quality information, and DGPS corrections are simply excluded for failed satellites. For autonomous GPS users, a special integrity message is required and defined to communicate the satellite failure status information.
-
公开(公告)号：DE10084224T1
公开(公告)日：2003-02-20
申请号：DE10084224
申请日：2000-02-15
Applicant: MOTOROLA INC
Inventor： KING THOMAS M
Abstract: A fixed site and satellite data-aided system and method of GPS signal acquisition from a plurality of broadcasted GPS signals includes lengthening a pre-detection integration interval so that weak signals can be detected by operating coherently on captured signals. Coherency is ensured by relying on the predictability of the satellite signal's data pattern. The described method significantly reduces correlation resolution time based on applying information regarding code phase delays from each satellite in view to reduce code search space for other satellites being correlated. A position fix can be either computed locally or remotely at the fixed position reference site.
-
Patent Agency Ranking
公开(公告)号：GB2360657A
公开(公告)日：2001-09-26
申请号：GB0027440
申请日：2000-11-09
Applicant: MOTOROLA INC
Inventor： KING THOMAS M , GEIER GEORGE J , ZHAO YILIN
IPC: G01S19/27 , G01C21/00 , G01S1/00 , G01S5/00 , G01S5/14 , G01S19/07 , G01S19/08 , G01S19/20 , H04Q7/34 , H04Q7/38
Abstract: A cellular network protocol which maintains the reliability of assisted GPS based positioning is taught. An Integrity Monitor (IM) informs mobile stations, their users, or networks of measurement quality and it warns them of failing and failed GPS satellites by isolating them from the effects of these failures. Whenever an unhealthy satellite is detected, its corresponding assistance data will be excluded for delivery or for position determination. In other words, there are two specific aspects to the Integrity Monitor (IM). For DGPS users, it predicts the reliability or quality of the DGPS corrections. For all users, it isolats the mobile position calculation from the effects of GPS satellite failures. The UDRE parameter, nominally output by a reference DGPS receiver, is used to communicate the DGPS quality information, and DGPS corrections are simply excluded for failed satellites. For autonomous GPS users, a special integrity message is required and defined to communicate the satellite failure status information.
-
公开(公告)号：GB2358976A
公开(公告)日：2001-08-08
申请号：GB0027434
申请日：2000-11-09
Applicant: MOTOROLA INC
Inventor： KING THOMAS M , GEIER GEORGE J , ZHAO YILIN , HART ROGER C
Abstract: In a mobile radio communication system, a method for locating handset 104 comprises receiving initial GPS ephemeris data, clock correction data and differential GPS (DGPS) correction data from a reference receiver 118 and base station controller 110, and determining whether the GPS ephemeris data for one or more of the plurality of GPS satellites 120 requires update. If so, a request for updated GPS ephemeris data is made and received from the base station, possibly through a cellular network and transmission 101, and the location of the mobile handset 104 is determined using the initial GPS ephemeris data, the clock correction data, the DGPS correction data, and the updated GPS ephemeris data. The judgement as to whether the ephemeris data requires updating may involve estimating the likely accuracy of the computed location based on the initial ephemeris data, or determining whether the age of the ephemeris data has exceeded a predetermined age limit.
-
公开(公告)号：ES2321723T3
公开(公告)日：2009-06-10
申请号：ES04785686
申请日：2004-05-04
Applicant: MOTOROLA INC
Inventor： KING THOMAS M , RICKS THOMAS , MURRAY DAVID
Abstract: Un método en un dispositivo portátil de comunicaciones (100) que aloja un transmisor de radio frecuencia y un receptor del sistema de posicionamiento por satélite (110, 400), incluyendo el método: producir una señal de interferencia con el transmisor de radio frecuencia; detectar (210) la presencia de la señal de interferencia (307, 308, 309) en el receptor del sistema de posicionamiento por satélite después de que la señal de interferencia entra en el receptor del sistema de posicionamiento por satélite; teniendo la señal de interferencia una configuración que es conocida antes de la detección; reducir (230) la señal de interferencia suprimiendo el receptor del sistema de posicionamiento por satélite con una señal de supresión (342, 344, 346) que tiene una configuración similar a la señal de interferencia sincronizada con la señal de interferencia.
-
公开(公告)号：FR2802037B1
公开(公告)日：2006-08-04
申请号：FR0014378
申请日：2000-11-09
Applicant: MOTOROLA INC
Inventor： KING THOMAS M , GEIER GEORGE J , ZHAO YILIN
Abstract: A cellular network protocol which maintains the reliability of assisted GPS based positioning is taught. An Integrity Monitor (IM) informs mobile stations, their users, or networks of measurement quality and it warns them of failing and failed GPS satellites by isolating them from the effects of these failures. Whenever an unhealthy satellite is detected, its corresponding assistance data will be excluded for delivery or for position determination. In other words, there are two specific aspects to the Integrity Monitor (IM). For DGPS users, it predicts the reliability or quality of the DGPS corrections. For all users, it isolates the mobile position calculation from the effects of GPS satellite failures. The UDRE parameter, nominally output by a reference DGPS receiver, is used to communicate the DGPS quality information, and DGPS corrections are simply excluded for failed satellites. For autonomous GPS users, a special integrity message is required and defined to communicate the satellite failure status information.
-
公开(公告)号：ES2179755B1
公开(公告)日：2004-09-16
申请号：ES200002697
申请日：2000-11-08
Applicant: MOTOROLA INC
Inventor： KING THOMAS M , GEIER GEORGE J , ZHAO YILIN , HART ROGER C
Abstract: A cellular network protocol which minimizes the required data flow between the cellular infrastructure and each mobile handset supporting a GPS based positioning capability is taught. Four specific innovations are introduced which together minimize the number of bits required to be transferred to each handset: a method for reducing or removing the requirement for GPS ephemeris updates to each mobile; a method for compression of the differential correction broadcast message; a method for controlling the rate at which the network updates each handset's ephemeris based on an ephemeris age limit; and, finally, a method which each mobile can use to determine when an ephemeris update is needed, based on an accuracy prediction and a threshold which is unique to each mobile.
-
-
-
-
-
-
-
-
-
Search Results
48
records
(took 0.024 seconds)
