WO2005008273A1 - Recepteur gps et serveur pour gps assiste - Google Patents

Recepteur gps et serveur pour gps assiste Download PDF

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Publication number
WO2005008273A1
WO2005008273A1 PCT/IB2004/002277 IB2004002277W WO2005008273A1 WO 2005008273 A1 WO2005008273 A1 WO 2005008273A1 IB 2004002277 W IB2004002277 W IB 2004002277W WO 2005008273 A1 WO2005008273 A1 WO 2005008273A1
Authority
WO
WIPO (PCT)
Prior art keywords
gps
gps receiver
assistance data
receiver
ephemeris
Prior art date
Application number
PCT/IB2004/002277
Other languages
English (en)
Inventor
Saul R. Dooley
Andrew T. Yule
Original Assignee
Koninklijke Philips Electronics N.V.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Koninklijke Philips Electronics N.V. filed Critical Koninklijke Philips Electronics N.V.
Publication of WO2005008273A1 publication Critical patent/WO2005008273A1/fr

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
    • G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
    • G01S19/03—Cooperating elements; Interaction or communication between different cooperating elements or between cooperating elements and receivers
    • G01S19/05—Cooperating elements; Interaction or communication between different cooperating elements or between cooperating elements and receivers providing aiding data

Definitions

  • GPS RECEIVER AND SERVER FOR ASSISTED GPS This invention relates to a server configured to transmit to a remote
  • GPS receiver assistance data for assisting the GPS receiver to acquire GPS signals and to a GPS receiver configured to request from a remote server such assistance data.
  • PCT patent application, publication number WO02/099454A2 concerns a method and apparatus for generating and distributing satellite tracking information.
  • the section entitled "Description of the Related Art" of that patent acknowledges the difficulty that a NAVSTAR GPS receiver experiences in downloading ephemeris (satellite orbit and clock data) from a GPS satellite in low signal strength conditions; and also the AGPS solution to this problem in which ephemeris data in GPS signals is received by a GPS receiver at a reference station and transmitted onwards to a remote GPS receiver which uses this ephemeris instead of that transmitted directly from GPS satellites to obtain a position fix.
  • WO02/099454A2 indicates that since the source of AGPS ephemeris is ultimately the GPS satellites, the ephemeris remains valid for only a few hours (because of the simplified satellite orbit model described by standard NAVSTAR GPS ephemeris). As such, AGPS necessitates the remote GPS receiver connecting to a source of ephemeris information either periodically or each time a position fix is desired to ensure it is in possession of up to date ephemeris. Without up to date ephemeris, a remote GPS receiver will not be able to accurately determine its position. In addition, a GPS receiver may use such ephemeris to acquire GPS signals more quickly whereas otherwise, it would have to wait at least 30 seconds to receive and demodulate the entire ephemeris data message on a GPS signal.
  • a server configured to transmit to a remote GPS receiver upon determining the availability of updated assistance data for assisting the GPS receiver to acquire GPS signals either a signal notifying the GPS receiver of such availability or a signal containing the updated assistance data.
  • a server may be configured to both transmit a signal notifying the GPS receiver of such availability and, upon receiving a request from the remote GPS receiver for the updated assistance data, to transmit the updated assistance data to the GPS receiver.
  • a GPS receiver configured to request from a remote server updated assistance data for assisting the GPS receiver to acquire GPS signals upon determining that such assistance data currently stored by the GPS receiver is invalid.
  • an improved AGPS system can be provided based on this realisation by providing either a base station / server which upon determining the availability of updated assistance data will provide or offer, e.g. for remuneration, the updated assistance data to a GPS receiver; or a GPS receiver which will active request such assistance data upon determining that such assistance data currently stored by that GPS receiver is invalid.
  • FIG. 1 shows the geographic layout of a cellular telephone network
  • Figure 2 shows the mobile cellular telephone MS1 of figure 1 in greater detail
  • Figure 3 shows the base station BS1 of figure 1 in greater detail.
  • the geographical layout of a conventional cellular telephone network 1 is shown schematically in figure 1.
  • the network comprises a plurality of base stations BS of which seven, BS1 to BS7, are shown, situated at respective, mutually spaced geographic locations.
  • Each of these base stations comprises the entirety of a radio transmitter and receiver operated by a trunking system controller at any one site or service area.
  • the system may furthermore comprise a system controller SC provided with a two-way communication link, CL1 to CL7 respectively, to each base station BS1 to BS7.
  • Each of these communication links may be, for example, a dedicated land-line.
  • the system controller SC may, furthermore, be connected to a the public switched telephone network (PSTN) to enable communication to take place between a mobile cellular telephone MS1 and a subscriber to that network.
  • PSTN public switched telephone network
  • a plurality of mobile cellular telephones MS are provided of which three, MS1 , MS2 and MS3 are shown, each being able to roam freely throughout the whole region, and indeed outside it.
  • mobile cellular telephone MS1 is shown in greater detail comprising a communications transmitter (Comm Tx) and receiver (Comm Rx) 21 connected to a communications antenna 20 and controlled by a communications microprocessor (Comm ⁇ c) 22 for communication with the base station BS1 with which it is registered.
  • a communications transmitter Communication Tx
  • Comm Rx communications transmitter
  • Comm ⁇ c communications microprocessor
  • the design and manufacturing of such telephones for two-way communication within a cellular telephone network are well known, those parts which do not form part of the present invention will not be elaborated upon here further.
  • telephone MS1 further comprises a GPS receiver (GPS Rx) 24 connected to a GPS antenna 23 and controlled by a GPS microprocessor (GPS ⁇ c) 25 receiving GPS spread spectrum signals transmitted from orbiting GPS satellites.
  • GPS Rx GPS receiver
  • GPS ⁇ c GPS microprocessor
  • the GPS receiver 24 may receive NAVSTAR SPS GPS signal through an antenna 23 and pre-process them, typically by passive bandpass filtering in order to minimise out-of-band RF interference, preamplification, down conversion to an intermediate frequency (IF) and analog to digital conversion.
  • IF intermediate frequency
  • the resultant, digitised IF signal remains modulated, still containing all the information from the available satellites, and is fed into a memory of the GPS microprocessor 25.
  • the GPS signals may then be are acquired and tracked in any of several digital receiver channels, typically up to 12, for the purpose of deriving pseudorange information from which the position of the mobile telephone can be determined using conventional navigation algorithms.
  • the GPS microprocessor 25 may be implemented in the form a general purpose microprocessor, optionally common with the communications microprocessor 22, or a microprocessor embedded in a GPS application specific integrated circuit (ASIC).
  • Cellular telephone network base station BS1 is shown schematically in figure 3. In additional to the conventional components of a base station, it further comprises a GPS antenna 34, receiver 35 and microprocessor 36 which are in substantially continual operation whereby the base station is in constant possession of up to date GPS satellite information.
  • This information includes which of the orbiting satellites are presently in view (such satellites are likely to be common to both telephone and associated base station for even macrocells, obscuration aside); the GPS data message containing an up to date almanac and ephemeris data and satellite clock correction data, and the Doppler shift and current code phase of the GPS satellites signals as observed by the base station.
  • the GPS processor 25 of mobile telephone MS1 may acquire incoming GPS signals as illustrated in the following example scenarios: Example 1
  • the GPS receiver of the base station which as mentioned is in constant possession of up to date GPS satellite information, detects updated ephemeris by a detecting the change in the "Issue of Data" (IOD) field of the GPS satellite data message.
  • the base station BS1 In response to this and under the control of the system controller SC via a two-way communication link CL1 , the base station BS1 sends a signal to the mobile telephone MS1 instructing it to ask the user of telephone MS1 whether the user wishes to download to the mobile telephone up to date ephemeris for a specified fee. If the user instructs the mobile telephone to answer "yes", a signal sent by the mobile telephone which causes the base station to transmit the ephemeris and a corresponding fee to be applied to the user's monthly telephone bill.
  • the mode of communication in which the offer of up to date ephemeris and the transfer of up to date ephemeris may be either the same or different, for example, when the offer is made by paging or SMS and the transfer of up to date ephemeris done by GSM transfer.
  • the GPS receiver of mobile telephone MS1 may then use the ephemeris to quickly acquire GPS signals from the time when the ephemeris data is received to the point where it becomes invalid.
  • Example 2 Assuming the GPS receiver of mobile telephone MS1 is in possession of an up to date ephemeris data message, the GPS receiver periodically monitors the Issue of the IOD field of the GPS satellite data message.
  • the GPS receiver requests from the base station BS1 updated ephemeris data to assist the GPS receiver to quickly acquire GPS signals.
  • Ephemeris is intended to include any GPS parameters satellite orbit and clock correction data that have limited time validity. These parameters may accord with those transmitted by the GPS satellites themselves or, for example, long term ephemeris parameters derived at a base station from those transmitted by the GPS satellites themselves as disclosed in WO02/099454A2.
  • the IOD field is used in the detection of updated ephemeris although of course changes in other GPS satellite data message parameters might also indicate an update.
  • the assistance data provided was ephemeris data, however, this could also include ephemeris derivatives such as Doppler estimates and almanac data.
  • GPS is intended to refer to any positioning system comprising a plurality of spread spectrum radio transmitters at different locations and a receiver which determines its location based on the time of arrival of the transmissions of the radio transmitters. From a reading of the present disclosure, other modifications will be apparent to the skilled person and may involve other features which are already known in the design, manufacture and use of GPS receivers and component parts thereof and which may be used instead of or in addition to features already described herein.

Landscapes

  • Engineering & Computer Science (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Position Fixing By Use Of Radio Waves (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention se rapporte à un serveur configuré de telle sorte que, après avoir déterminé la disponibilité de données d'assistance mises à jour destinées à aider un récepteur GPS à acquérir des signaux GPS, il transmet au récepteur GPS éloigné soit un signal notifiant le récepteur GPS d'une telle disponibilité, soit un signal contenant les données d'assistance mises à jour. Un tel serveur peut être configuré de façon à transmettre un signal notifiant le récepteur GPS d'une telle disponibilité et, à la réception d'une demande de données d'assistance mises à jour provenant du récepteur GPS éloigné, à transmettre également audit récepteur lesdites données d'assistance mises à jour. L'invention se rapporte également à un récepteur GPS configuré de façon à demander à un serveur éloigné des données d'assistance mises à jour destinées à aider le récepteur à acquérir des signaux GPS, lorsqu'il est déterminé que de telles données d'assistance actuellement stockées par le récepteur GPS ne sont pas valables.
PCT/IB2004/002277 2003-07-17 2004-07-12 Recepteur gps et serveur pour gps assiste WO2005008273A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0316691.5 2003-07-17
GB0316691A GB0316691D0 (en) 2003-07-17 2003-07-17 GPS receiver and server

Publications (1)

Publication Number Publication Date
WO2005008273A1 true WO2005008273A1 (fr) 2005-01-27

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GB (1) GB0316691D0 (fr)
WO (1) WO2005008273A1 (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007099196A1 (fr) * 2006-02-28 2007-09-07 Nokia Corporation Procedes et appareils destines a des systemes de navigation assistee
WO2007099195A1 (fr) * 2006-02-28 2007-09-07 Nokia Corporation Procédé et appareil pour systèmes de navigation
US8310396B2 (en) 2006-09-21 2012-11-13 Nokia Corporation Assisted satellite signal based positioning
RU2481595C2 (ru) * 2008-06-27 2013-05-10 Нокиа Корпорейшн Идентификация частот и спутников глобальной навигационной спутниковой системы в стандартах данных поддержки глобальной навигационной спутниковой системы
US9121937B2 (en) 2011-12-29 2015-09-01 Google Technology Holdings LLC Method and apparatus for tracking a global navigation satellite system within the constraints of an indoor facility
EP2389022A4 (fr) * 2009-04-30 2016-06-08 Zte Corp Procédé et système d'indication de la mise à jour des données d'assistance de services de localisation
CN112612038A (zh) * 2020-12-31 2021-04-06 杭州飞舸科技有限公司 低功耗gps定位方法及系统
US20210263163A1 (en) * 2020-02-26 2021-08-26 Cufit Inc. Gps filter-setting method, and server using the same

Citations (9)

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Publication number Priority date Publication date Assignee Title
US6133874A (en) * 1996-03-08 2000-10-17 Snaptrack, Inc. Method and apparatus for acquiring satellite positioning system signals
US6222483B1 (en) * 1998-09-29 2001-04-24 Nokia Mobile Phones Limited GPS location for mobile phones using the internet
US6285315B1 (en) * 1999-02-16 2001-09-04 Symmetricom, Inc. Positioning systems
US6313787B1 (en) * 1999-11-12 2001-11-06 Motorola, Inc. Method and apparatus for assisted GPS protocol
WO2002023216A1 (fr) * 2000-09-12 2002-03-21 Ericsson Inc. Systeme de detection de position integre dans un terminal mobile
US6429811B1 (en) * 2000-02-15 2002-08-06 Motorola, Inc. Method and apparatus for compressing GPS satellite broadcast message information
US20020168985A1 (en) * 2001-02-16 2002-11-14 Yilin Zhao GPS assistance messages in cellular communications networks and methods therefor
US20020188403A1 (en) * 2001-06-06 2002-12-12 Lamance James W. Method and apparatus for generating and distributing satellite tracking information
WO2004031800A1 (fr) * 2002-10-02 2004-04-15 Global Locate, Inc. Procede et appareil destines a utiliser des donnees de poursuite de satellite a long terme dans un recepteur a distance

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6133874A (en) * 1996-03-08 2000-10-17 Snaptrack, Inc. Method and apparatus for acquiring satellite positioning system signals
US6222483B1 (en) * 1998-09-29 2001-04-24 Nokia Mobile Phones Limited GPS location for mobile phones using the internet
US6285315B1 (en) * 1999-02-16 2001-09-04 Symmetricom, Inc. Positioning systems
US6313787B1 (en) * 1999-11-12 2001-11-06 Motorola, Inc. Method and apparatus for assisted GPS protocol
US6429811B1 (en) * 2000-02-15 2002-08-06 Motorola, Inc. Method and apparatus for compressing GPS satellite broadcast message information
WO2002023216A1 (fr) * 2000-09-12 2002-03-21 Ericsson Inc. Systeme de detection de position integre dans un terminal mobile
US20020168985A1 (en) * 2001-02-16 2002-11-14 Yilin Zhao GPS assistance messages in cellular communications networks and methods therefor
US20020188403A1 (en) * 2001-06-06 2002-12-12 Lamance James W. Method and apparatus for generating and distributing satellite tracking information
WO2004031800A1 (fr) * 2002-10-02 2004-04-15 Global Locate, Inc. Procede et appareil destines a utiliser des donnees de poursuite de satellite a long terme dans un recepteur a distance

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8717235B2 (en) 2006-02-28 2014-05-06 Nokia Corporation Method and apparatus for navigation systems
US8620580B2 (en) 2006-02-28 2013-12-31 Nokia Corporation Methods and apparatuses for assisted navigation systems
AU2006339342B2 (en) * 2006-02-28 2011-06-16 Nokia Technologies Oy Method and apparatus for navigation systems
AU2006339342C1 (en) * 2006-02-28 2011-11-17 Nokia Technologies Oy Method and apparatus for navigation systems
US8154442B2 (en) 2006-02-28 2012-04-10 Nokia Corporation Method and apparatus for navigation systems
WO2007099196A1 (fr) * 2006-02-28 2007-09-07 Nokia Corporation Procedes et appareils destines a des systemes de navigation assistee
WO2007099195A1 (fr) * 2006-02-28 2007-09-07 Nokia Corporation Procédé et appareil pour systèmes de navigation
US8624778B2 (en) 2006-09-21 2014-01-07 Nokia Corporation Assisted satellite signal based positioning
US8310396B2 (en) 2006-09-21 2012-11-13 Nokia Corporation Assisted satellite signal based positioning
RU2481595C2 (ru) * 2008-06-27 2013-05-10 Нокиа Корпорейшн Идентификация частот и спутников глобальной навигационной спутниковой системы в стандартах данных поддержки глобальной навигационной спутниковой системы
EP2389022A4 (fr) * 2009-04-30 2016-06-08 Zte Corp Procédé et système d'indication de la mise à jour des données d'assistance de services de localisation
US9121937B2 (en) 2011-12-29 2015-09-01 Google Technology Holdings LLC Method and apparatus for tracking a global navigation satellite system within the constraints of an indoor facility
US20210263163A1 (en) * 2020-02-26 2021-08-26 Cufit Inc. Gps filter-setting method, and server using the same
US11567218B2 (en) * 2020-02-26 2023-01-31 Yanadoo Corp GPS filter-setting method, and server using the same
CN112612038A (zh) * 2020-12-31 2021-04-06 杭州飞舸科技有限公司 低功耗gps定位方法及系统

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Publication number Publication date
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