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公开(公告)号：US10739471B2
公开(公告)日：2020-08-11
申请号：US15738926
申请日：2016-06-22
Applicant: CENTRE NATIONAL D'ETUDES SPATIALES
Inventor： Denis Laurichesse
Abstract: The invention discloses a receiver and a method to process navigation signals from one or more GNSS constellation, wherein an observation model and a measurement model allow a direct calculation of the carrier phase ambiguities. More specifically, in a triple frequency implementation, the receiver calculates in turn the extrawidelane, widelane and narrowlane ambiguities. The code and carrier phase biases can also be directly calculated. Thanks to the invention a quicker acquisition and tracking of a precise position, which will also be less noisy than a prior art solution, especially in some embodiments of the invention using a RAIM and/or a gap-bridging function. Also, code smoothing using the Doppler and low latency clock synchronization allow to decrease the noise levels of the precise point navigation solutions.
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公开(公告)号：US10732295B2
公开(公告)日：2020-08-04
申请号：US15326096
申请日：2015-07-16
Applicant: CENTRE NATIONAL D'ETUDES SPATIALES
Inventor： Denis Laurichesse
IPC: G01S19/39
Abstract: The positioning receiver according to the invention comprises means for storing configuration information and information on its reception conditions, which is processed in order to calculate a current and/or predicted precision of the positioning calculation. Advantageously, at least some of this information is integrated into a variation model of a Kalman filter integrated into the receiver. The invention notably allows a more rapid convergence on a reference precision in a mono-frequency operating mode and transitions between a mono-frequency and bi-frequency mode to be smoothed. Advantageously, the precision information is delivered graphically or in numerical form to the user.
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Patent Agency Ranking
公开(公告)号：US09974222B2
公开(公告)日：2018-05-22
申请号：US15026791
申请日：2014-10-03
Applicant: CENTRE NATIONAL D'ETUDES SPATIALES
Inventor： Denis Laurichesse
CPC classification number: A01B49/065 , A01B39/02 , A01B69/008 , A01B79/005 , A01C7/00 , A01C21/00 , A01C21/002 , G01S19/13
Abstract: This machine includes a tool (30) actuated by an actuating module (32); a dual-frequency satellite positioning module (40) able to take into account corrections relative to the disruptions affecting the propagation of radio navigation signals emitted by each of the visible radio navigation satellites and that are caused by the ionosphere, so as to determine an absolute position of the machine, and consequently of the tool, which is precise to within a centimeter; and a computer (50) able to compare the instantaneous absolute position of the tool and an absolute position of a current revisiting point, selected from among the revisiting points of a revisiting plan, the computer then being able to command the actuation module.
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公开(公告)号：US11415708B2
公开(公告)日：2022-08-16
申请号：US16957716
申请日：2018-12-21
Applicant: CENTRE NATIONAL D'ETUDES SPATIALES
Inventor： Cédric Rouch , Denis Laurichesse , François-Xavier Marmet
Abstract: A positioning device includes a first GNSS receiver; a communication link configured to receive a spatial position, code measurements and carrier phase measurements of a second GNSS receiver; an input interface to a processing logic, the processing logic being configured to: calculate a position of the first positioning device from communicated data; and to estimate one or more parameters representative of multipath at the position of the first positioning device; wherein the communication link is configured to communicate to a second positioning device the parameters representative of multipath at the position of the first positioning device. Described developments comprise the use of multipath severity indicators, the determination of relative distances between receivers, validity conditions in time and/or space of multipath, various embodiments in a train or in a group of vehicles. Software aspects are discussed.
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公开(公告)号：US11291152B2
公开(公告)日：2022-04-05
申请号：US15966253
申请日：2018-04-30
Applicant: CENTRE NATIONAL D'ETUDES SPATIALES
Inventor： Denis Laurichesse
Abstract: This machine includes a tool (30) actuated by an actuating module (32); a dual-frequency satellite positioning module (40) able to take into account corrections relative to the disruptions affecting the propagation of radio navigation signals emitted by each of the visible radio navigation satellites and that are caused by the ionosphere, so as to determine an absolute position of the machine, and consequently of the tool, which is precise to within a centimeter; and a computer (50) able to compare the instantaneous absolute position of the tool and an absolute position of a current revisiting point, selected from among the revisiting points of a revisiting plan, the computer then being able to command the actuation module.
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公开(公告)号：US09851447B2
公开(公告)日：2017-12-26
申请号：US14733355
申请日：2015-06-08
Applicant: CENTRE NATIONAL D'ETUDES SPATIALES
Inventor： Denis Laurichesse , Flavien Mercier
Abstract: A method for determining assistance data to facilitate processing of radio-navigation signals from a set of radio-navigational satellites of a reference network, each radio-navigational satellite broadcasting at least a first radio-navigation signal on a first frequency and a second radio-navigation signal on a second frequency, the second frequency being distinct from the first frequency, is provided.
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公开(公告)号：US10942281B2
公开(公告)日：2021-03-09
申请号：US16089814
申请日：2017-03-31
Applicant: CENTRE NATIONAL D'ETUDES SPATIALES
Inventor： Denis Laurichesse , François-Xavier Marmet , Lionel Ries
Abstract: The invention discloses an improved GNSS receiver which determines a location of the receiver by combining a first location determined either from the standard PVT of a multi-frequency receiver and/or from a positioning aid like a map matching algorithm, inertial navigation system, WiFi localization system or other, and a second location determined by integrating the velocity from the standard PVT. The combination is based on a duty cycle or a combination of the duty cycle with a weighting of the error budgets of the first position and the second location. The improved receiver is preferably based on a standard receiver with an add-on software module which receives and processes data transmitted from the standard receiver by, for example, NMEA messages. The improved receiver allows a determination of a more precise and smoother trajectory in a simple way.
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