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公开(公告)号：JP2001356162A
公开(公告)日：2001-12-26
申请号：JP2001116629
申请日：2001-04-16
Applicant: LUCENT TECHNOLOGIES INC
Inventor： DA REN
Abstract: PROBLEM TO BE SOLVED: To determine the position of a wireless terminal unable to unobstructedly receive satellite signals by selectively using a PPO time delay parameter after automatically acquiring the PPO time delay parameter of the wireless terminal in an integrated wireless GPS. SOLUTION: The position of the wireless terminal located in the sector of a base station is determined from the GPS signals received from satellites. The position of the base station is acquired from a database 650. The distance between the wireless terminal and the base station is determined from the acquired position of the base station and the determined position of the wireless terminal. The distance between the wireless terminal and the base station is converted into time d. The delay time b of the GPS signals from the satellites to the wireless terminal due to the delay at the wireless terminal is calculated. The time d is subtracted from the delay time b to determine the PPO time delay parameter.
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公开(公告)号：JP2001318136A
公开(公告)日：2001-11-16
申请号：JP2001095149
申请日：2001-03-29
Applicant: LUCENT TECHNOLOGIES INC
Inventor： CHEN BYRON H , DA REN , TEKIN IBRAHIM
Abstract: PROBLEM TO BE SOLVED: To solve the problem related to positioning of the terminal of a wireless mobile communication device and the like for distance measuring such as satellite distance measuring and/or wireless network distance measuring. SOLUTION: At least three distance measurement values are applied with weighted ridge regression(WRR) process to determine the position of the terminal. For example, in an integrated satellite navigation system/wireless network, at least three distance measurement values are applied with the WRR process to determine the position of a mobile communication device. Here, at least one distance measurement value is that of satellite system (for example, GPS pseudo distance measurement value) while at least one is that of wireless network system (for example, round propagation delay or pilot phase offset measurement value). The WRR process raises precision in determining position of a mobile communication device with a conventional minimum average square technology.
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公开(公告)号：JP2002006023A
公开(公告)日：2002-01-09
申请号：JP2001131568
申请日：2001-04-27
Applicant: LUCENT TECHNOLOGIES INC
Inventor： DA REN , VANNUCCI GIOVANNI
Abstract: PROBLEM TO BE SOLVED: To provide a method by which the position of a radio terminal can be decided in a short time. SOLUTION: This invention is conceived by combining the code acquiring techniques for frequency domain and time domain with each other. This invention obtains the accurate timing basis of the radio terminal by detecting one GPS signal by using the technique for frequency domain and, thereafter, another GPS signal from the same or another satellite by using the technique for time domain. When this invention is used, such an advantage is obtained that the signals can be detected without maintaining any accurate and detailed timing basis in the radio terminal nor requiring high computational ability.
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公开(公告)号：JP2002006027A
公开(公告)日：2002-01-09
申请号：JP2001121876
申请日：2001-04-20
Applicant: LUCENT TECHNOLOGIES INC
Inventor： DA REN
Abstract: PROBLEM TO BE SOLVED: To provide a method by which a bias parameter is adaptively adjusted in accordance with a possible change by automatically measuring an RTD parameter (bias) used in a WGP system and continuously improving the quality of estimation. SOLUTION: In this method, the estimated amount of the RTD parameter is obtained by using a radio terminal which can receive superior GPS signals without requiring the setting of a specific system for calibration nor calibration by means of many skilled persons at a job site and a previously obtained parameter stored in a data base is updated by using the estimated RTD parameter. The estimated RTD parameter is used at the time of deciding the position where the ratio terminal is not able to receive the superior GPS signals based on the information obtained from a radio network.
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公开(公告)号：JP2001272454A
公开(公告)日：2001-10-05
申请号：JP2001026210
申请日：2001-02-02
Applicant: LUCENT TECHNOLOGIES INC
Inventor： DA REN , VANNUCCI GIOVANNI
Abstract: PROBLEM TO BE SOLVED: To provide a device and a method, using navigation data, which enable even a weak GPS signal affected by an obstacle such as a structure, etc., to be used for position measurement. SOLUTION: A radio terminal increases its total signal detection sensitivity by increasing integration intervals (e.g. >=20 ms) by performing data wipe-off operation by using estimated navigation data. After an intense GPS signal is detected, the intense GPS signal is demodulated to compute a satellite position table including navigation data. Then the demodulated navigation data are matched against known features of navigation data to estimate navigation data as to a weak GPS signal. Then the estimated navigation data are used to increase the integration intervals of the weak GPS signal, so that even the weak GPS signal can be detected by the ratio terminal.
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Patent Agency Ranking
公开(公告)号：JP2001124842A
公开(公告)日：2001-05-11
申请号：JP2000268040
申请日：2000-09-05
Applicant: LUCENT TECHNOLOGIES INC
Inventor： TEKIN IBRAHIM , CHEN BYRON HUA , TSUN CHIN SHAN , DA REN
Abstract: PROBLEM TO BE SOLVED: To shorten the satellite searching time in a GPS system. SOLUTION: The integral time of a correlator is adjusted according to a signal strength measurement value of a satellite signal received by a GPS receiver. The integral value is adjusted proportionally; non-proportionally, or reversely to the received strength of a signal to be searched. In the implementation example, if received signal strength is more than a threshold value, an integral time is short (for example, 1 msec.). Contrarily, if received signal strength is lower than this threshold value, an integral time is long (for example, 1 sec.). For instance, the integral time is 1 sec. when a WAG client is in the interior and a satellite signal is weak, while the integral time is 1 msec. when the WGA client is in the outdoor and the satellite signal is strong. In this way, the integral time is dynamically regulated reversely according to the received signal strength of the satellite signal, so that the satellite signal can be easily detected without deteriorating detection system.
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7.发明专利
公开(公告)号：JP2001108736A
公开(公告)日：2001-04-20
申请号：JP2000262275
申请日：2000-08-31
Applicant: LUCENT TECHNOLOGIES INC
Inventor： DA REN , VANNUCCI GIOVANNI
Abstract: PROBLEM TO BE SOLVED: To facilitate detection for plural satellites even when an integration time of a correlator of a GPS receiver is long. SOLUTION: An area for a satellite signal searched by the GPS receiver and a code phase searching range are effectively narrowed based on information accumulated in the last search and a search message to facilitate the detection for the satellites, and the satellites are thereby searched successively.
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公开(公告)号：BR0101425A
公开(公告)日：2001-11-20
申请号：BR0101425
申请日：2001-04-09
Applicant: LUCENT TECHNOLOGIES INC
Inventor： DA REN
Abstract: An integrated wireless-global positioning system determines the location of a wireless terminal from satellite measurements and wireless network measurements. The accuracy of the location identified is dependent upon the quality of the measurement from the wireless network which, unfortunately, can contain measurement errors such as biases. Biases are caused by time delays which occur during the processing and transmission of signals. The time delays vary for each sector/base station and for each type of wireless terminal model being used. Calibration of these biases is important for the success of the integrated wireless global positioning system. For a small network system which has only a handful of base stations/wireless terminals, a specific system to calibrate the time delays for each base station and/or wireless terminal can be set up. The approach is, however, costly, time consuming, and subject to many errors. It is not feasible for a large scale, commercial system where hundreds of base stations and dozens of different types of wireless terminals are involved. This invention is a method of using an integrated wireless global positioning system to obtain pilot phase offset delay parameters, to continuously improve the quality of the values obtained, and to adaptively adjust the parameters for changes that may occur. The method does not require that a particular system be set up for the calibration, and it does not require a team of technical experts to perform field calibrations. With this method, the wireless terminals that have unobstructed reception of global positioning system signals are used to determine an estimate of the pilot phase offset time delay parameters which are then used to update previously obtained parameters in the database. The estimated pilot phase offset time delay parameter is then used to calibrate the pilot phase offset measurements applied to fix the position of a wireless terminal that does not have unobstructed GPS signal reception.
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公开(公告)号：BR0101111A
公开(公告)日：2001-11-06
申请号：BR0101111
申请日：2001-03-21
Applicant: LUCENT TECHNOLOGIES INC
Inventor： TEKIN IBRAHIM , CHEN BYRON HUA , DA REN
Abstract: Weighted ridge regression (WRR) processing is applied to three or more distance measurements to determine the location of a terminal. For example, in an integrated satellite-based navigation system / wireless network, the location of a mobile unit can be determined by applying WRR processing to at least three distance measurements, where one or more of the distance measurements are satellite-based distance measurements (e.g., GPS pseudorange measurements) and one or more are wireless network-based distance measurements (e.g., round-trip delay or pilot phase offset measurements). WRR processing provides improved accuracy in the determination of mobile unit position over conventional least mean square techniques.
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公开(公告)号：AU5506100A
公开(公告)日：2001-03-08
申请号：AU5506100
申请日：2000-08-31
Applicant: LUCENT TECHNOLOGIES INC
Inventor： TEKIN IBRAHIM , CHEN BYRON HUA , CHIANG TUNG CHING , DA REN
IPC: G01S1/00 , G01S3/783 , G01S19/25 , G01S19/27 , H04B1/707 , H04B1/709 , H04B7/15 , H04B7/185 , G01S1/02
Abstract: Disclosed is a method and apparatus for facilitating detection of satellite signals using a dynamic integration technique in which integration time periods of correlators are adjusted according to signal strength measurements of satellite signals received at GPS receivers. Specifically, integration time periods are inversely adjusted, either proportionally or non-proportionally, to received strengths of signals being searched.
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