EP0857306A1 - Combinaison d'un recepteur gps et d'un appareil de telecommunications - Google Patents

Combinaison d'un recepteur gps et d'un appareil de telecommunications

Info

Publication number
EP0857306A1
EP0857306A1 EP97926171A EP97926171A EP0857306A1 EP 0857306 A1 EP0857306 A1 EP 0857306A1 EP 97926171 A EP97926171 A EP 97926171A EP 97926171 A EP97926171 A EP 97926171A EP 0857306 A1 EP0857306 A1 EP 0857306A1
Authority
EP
European Patent Office
Prior art keywords
gps
secondary station
receiver
gps receiver
processor
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP97926171A
Other languages
German (de)
English (en)
Inventor
Andrew Thomas Yule
Rodney William Gibson
Bryan David Young
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Koninklijke Philips NV
Original Assignee
Koninklijke Philips Electronics NV
Philips Electronics NV
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 NV, Philips Electronics NV filed Critical Koninklijke Philips Electronics NV
Publication of EP0857306A1 publication Critical patent/EP0857306A1/fr
Withdrawn legal-status Critical Current

Links

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
    • G01S19/13—Receivers
    • G01S19/23—Testing, monitoring, correcting or calibrating of receiver elements
    • G01S19/235—Calibration of receiver components
    • 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
    • G01S19/13—Receivers
    • G01S19/24—Acquisition or tracking or demodulation of signals transmitted by the system
    • G01S19/27—Acquisition or tracking or demodulation of signals transmitted by the system creating, predicting or correcting ephemeris or almanac data within the receiver
    • 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
    • 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
    • G01S19/13—Receivers
    • G01S19/34—Power consumption

Definitions

  • the present invention relates to a combination of a GPS receiver and a telecommunications transceiver or receiver.
  • a particular, but not exclusive, application of the present invention is a combination of a GPS receiver and an answer-back pager.
  • the latter may comprise a one way (or receive only) pager, a cellular/cordless telephone or a mobile/portable transceiver.
  • GPS is to be understood to cover other satellite navigation systems as well as the Global Positioning System of the USA.
  • ephemeris data has been used to describe all the data transmitted by a GPS satellite, which data characterises both the satellite's orbit and the characteristics of its on-board clock.
  • the English language abstract of Japanese Kokai 07075162 discloses a promotional apparatus for use with retail premises in which a transmitter transmits one way promotional information together with location information.
  • each of the receivers carries out its own function and supplies the results to the processor. This is not particularly effective from the point of view of battery current savings.
  • the GPS receivers In order for the appropriate measurements to be made by the GPS receivers, that is, timing the arrival of signals from at least four GPS satellites, the GPS receiver would need to be given a clear view of the sky for a period of approximately 10 seconds.
  • a calculation of the subscriber's position needs to be carried out and the result displayed by whatever means the secondary station has, normally a LCD screen. The time taken for this calculation will depend on the processing power of the microprocessor in the GPS receiver. As an indication a type 8051 processor requires approximately 5 seconds to carry out the necessary processing.
  • the hardware required for a GPS receiver is typically made up of two integrated circuits, namely an analogue rf front end and a digital base band processor, with a small number of discrete components.
  • the antenna is typically a simple patch antenna approximately 2 to 3 centimetres on each side (the carrier frequency is approximately 1.5 GHz).
  • a typical present-day GPS chip set might consume 500 to 800 mW of power at 3 volts. There are a number of reasons for this high power consumption, but probably the main one is that for most current applications continuous operation is required with new position fixes being generated every second. This leads to the need for a power hungry 16 bit microprocessor clocked typically at 25 MHz.
  • the time taken for a GPS receiver to generate the position fix from the time it is turned on is governed by the following factors:
  • the first two factors are rather different in nature as they are issues that are normally not too important in GPS receivers. This is because they only have to be carried out at start-up and then occasionally as a background task. Acquiring at least four satellites is highly dependent on how much prior knowledge the system has. If it has no information whatsoever, the acquisition might take an hour, whilst if it has a good idea of its position (within a few 10s of kilometres) and the current time (within a few seconds) acquisition may take only a couple of seconds. In the limit, a receiver that knows very accurately where it is and what the time is, could acquire signals almost instantly.
  • GPS receivers store some crude satellite orbit parameters (good enough for a prediction over a period of a few weeks) in a non-volatile memory and maintain a real - time clock when they are turned off. As a consequence they can normally acquire satellites within 10 to 30 seconds of being turned on.
  • Down-loading suitable orbit data from the satellites takes a minimum of thirty seconds. This is because the data is repeatedly transmitted in five sub-frames each of which takes 6 seconds to transmit.
  • a GPS receiver may acquire the signal at any point during the transmission cycle, so a particular instance may "waste" nearly a whole six second sub-frame whilst trying to find a recognisable preamble. Again some current GPS receivers store this data whilst they are turned off. However, the data only has a valid lifetime of a few hours (the orbits of the satellites are not constant) and so storing it for more than a day or so would achieve little.
  • An object of the present invention is to economise on the power consumption of a secondary station for receiving and processing GPS signals.
  • a combination of a paging system and a GPS system comprising a primary station having a GPS receiver and processor for receiving and deriving at least ephemeris data from received GPS signals and at least one transmitter for transmitting communication signals and the ephemeris data, and a secondary station having a GPS receiver, a communication receiver for receiving communication signals and ephemeris data from the at least one transmitter, a processor coupled to the GPS receiver and the communications receiver for determining the location of this secondary station from the ephemeris data and the GPS signals received by the GPS receiver.
  • the transmitter in the primary station occasionally broadcasting GPS ephemeris data, the time taken, and thereby the power consumed, to carry out a GPS position fix can be reduced considerably thereby leading to a significant current saving.
  • a secondary station for use in a system in which a primary station broadcasts ephemeris data relating to orbiting GPS satellites, the secondary station comprising a GPS receiver, a communications receiver for receiving communication signals and ephemeris data from the at least one transmitter, a processor coupled to the GPS receiver and the communications receiver for determining the location of the secondary station using the ephemeris data and GPS signals received by the GPS receiver.
  • a clock signal generated for the processor may be used to provide an accurate time signal to the GPS receiver and its digital baseband processor. The more accurately the GPS receiver knows the time, the easier it is for it to acquire the signal from the GPS satellite from the point of view of predicting the expected position in the sky and thus the determination of the Doppler shift is easier.
  • a crystal controlled oscillator used by the processor may also be used to characterise the local oscillator of the GPS receiver in advance. This in turn reduces the degree of uncertainty when attempting to acquire signals from the GPS satellite.
  • the secondary station may include a transmitter for transmitting location data to the primary station.
  • the transmitter can be used as an emergency beacon for transmitting the location data as a relatively low-bit rate signal thereby enabling the signal to be detected over a larger area than would be possible with a higher bit-rate transmission.
  • the secondary station may include coding means by which a user can send a coded signal indicating the type of emergency and/or what services are required at the same time as transmitting the location data.
  • the secondary station comprises a GPS receiver and answer-back pager.
  • the infrastructure comprises a paging system controller (PSC) 10 connected by a landline to one of a plurality of primary stations PS.
  • the primary station comprises a transceiver 12 which is controlled by the PSC 10.
  • a GPS receiver 14 which has an antenna 16 coupled to its input, has an output coupled to a digital baseband processor 15 including storage means (not shown) for ephemeris data recovered from the orbiting GPS satellite SAT1 , SAT2, SAT3 and SAT4.
  • a secondary station SS comprises an antenna 20 coupled to a receiver stage 22, the output of which is supplied to a decoder 24.
  • a processor 26 is coupled by way of bi-directional links 27, 28 with the decoder 24. The processor 26 is operated in accordance with software held in a programme store 30.
  • a RAM 32 for storing data messages and ephemeris data received from a primary station PS is coupled to the processor 26. The latter has an output coupled to a LCD driver 34 which in turn is coupled to a LCD panel 36.
  • a keypad 38 is coupled to the processor to provide a man/machine interface.
  • An acoustic transducer 40 and a light emitter 42, such as a LED, are coupled to the processor 26 which uses them as alerting devices and, additionally, the light emitter 42 may be used to forward optically messages and location data stored in the RAM 32 to say a printer or a personal computer (not shown).
  • the receiver 22 is operated by a processor 26 in accordance with a battery economising protocol and a battery economising stage 44 is coupled between the processor 26 and the receiver 22.
  • a low-power transmitter 46 is coupled between an output of the processor 26 and the antenna 20.
  • a patch antenna 50 is coupled to a GPS receiver 52 which provides an output 54 to the processor 26 which uses the received satellite data and the ephemeris data stored in the RAM 32 to compute the location of the secondary station.
  • the processor 26 includes a clock circuit based on a temperature controlled crystal oscillator (TCXO) 56.
  • the TCXO 56 provides an output 58 to the GPS receiver 52 in which it is used to characterise the receiver's local oscillator in advance. This removes uncertainty when attempting to acquire signals from the GPS satellites SAT1 , SAT2, SAT3 and SAT4.
  • the PSC 10 causes paging signals to be transmitted according to any suitable protocol such as the CCIR Radiopaging Code No 1 , otherwise known as POCSAG. Messages received and decoded by the secondary stage are stored in the RAM 32 for later recall and display.
  • any suitable protocol such as the CCIR Radiopaging Code No 1 , otherwise known as POCSAG.
  • Each GPS satellite typically there are 24 in operation at any time broadcasts approximately 500 bits of data detailing its orbit and information about its on-board clock, herein collectively termed the ephemeris data.
  • This information is usually updated every hour but is deemed to be valid for four hours. Accordingly the ephemeris data need only be relayed infrequently to the secondary station and this can be done in quiet periods.
  • the advantages of the secondary station storing ephemeris data in the RAM 32 are significant because it is likely that a position fix can be achieved within 15 to 20 seconds, of which only the first 10 seconds will involve the GPS specific hardware being active (the rest of the time would be needed purely for the position calculation by the processor 26).
  • the communications portion of the secondary station provides a means for aiding the GPS receiver in a number of ways:
  • TCXO 56 provides an accurate (to a fraction of a second) time signal. The more accurately the GPS device knows the time, the easier it is for it to acquire the signal from the GPS satellite (predicting the expected position in the sky and thus the doppler shift is easier to determine).
  • the local oscillator offset can be characterised in advance by reference to the apparent frequency of the paging signal. This again removes uncertainty when attempting to acquire the signals from GPS satellite.
  • So called "Differential GPS” signals may be incorporated into the pager system. This is a scheme that involves fixed base stations (for example the primary station transmitter sites) measuring apparent inaccuracies in the GPS signals (caused by atmospheric effects as well as the US military's deliberate attempts to degrade the quality of the information). The details of these inaccuracies can be sent to any GPS receivers in the locality and used to improve the accuracy of fair position calculations. This can potentially lead to inaccuracy of better than 5 meters (rather than the normal 100 meters).
  • the transmitter 46 provides the secondary station with a two-way capability.
  • the secondary station SS can operate as an emergency beacon transmitting location data as a relatively low-bit rate signal, perhaps as a spread spectrum signal.
  • the processor 26 can include coding means (not shown) which in response to actuation of the keys of the keypad 38 can enable the transmitter to transmit a coded signal indicating the type of emergency and/or what services are required together with location data.

Landscapes

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

Abstract

Une combinaison d'un récepteur GPS (52) et d'un récepteur (22) de télécommunications ou d'un émetteur-récepteur (22, 46) se partage un processeur (26) du récepteur de télécommunications pour supporter le trafic normal des télécommunications et pour déterminer la position du poste secondaire (PS). Pour réduire le temps d'acquisition et le courant consommé par le poste secondaire (PS), un poste primaire (PP) du système de télécommunications est également équipé d'un récepteur GPS (14) et d'un processeur (15) à bande de base numérique pour récupérer au moins les données d'éphémérides transmises par des satellites GPS (SAT1 à SAT4) en orbite autour de la terre, les données d'éphémérides étant téléchargées dans le poste secondaire (PS) et stockées dans une mémoire (32) pour être prêtes à l'utilisation lorsqu'un point de position fixe est demandé.
EP97926171A 1996-08-29 1997-06-26 Combinaison d'un recepteur gps et d'un appareil de telecommunications Withdrawn EP0857306A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GB9618067 1996-08-29
GBGB9618067.4A GB9618067D0 (en) 1996-08-29 1996-08-29 Combination of a GPS receiver and a telecommunications apparatus
PCT/IB1997/000788 WO1998009181A1 (fr) 1996-08-29 1997-06-26 Combinaison d'un recepteur gps et d'un appareil de telecommunications

Publications (1)

Publication Number Publication Date
EP0857306A1 true EP0857306A1 (fr) 1998-08-12

Family

ID=10799129

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97926171A Withdrawn EP0857306A1 (fr) 1996-08-29 1997-06-26 Combinaison d'un recepteur gps et d'un appareil de telecommunications

Country Status (5)

Country Link
EP (1) EP0857306A1 (fr)
JP (1) JPH11514749A (fr)
KR (1) KR19990067119A (fr)
GB (1) GB9618067D0 (fr)
WO (1) WO1998009181A1 (fr)

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GB9810639D0 (en) * 1998-05-19 1998-07-15 Koninkl Philips Electronics Nv Telemetrics device
US6141570A (en) * 1998-08-26 2000-10-31 Ericsson Inc. System and method for conserving battery energy in a wireless telephone with an integral global positioning system
US6411826B1 (en) * 1998-11-17 2002-06-25 Ericsson Inc. Portable radiotelephones including patch antennas having openings therein
GB2347035B (en) * 1999-02-16 2003-10-08 Symmetricom Inc Positioning system
US7053824B2 (en) 2001-11-06 2006-05-30 Global Locate, Inc. Method and apparatus for receiving a global positioning system signal using a cellular acquisition signal
US6313787B1 (en) * 1999-11-12 2001-11-06 Motorola, Inc. Method and apparatus for assisted GPS protocol
GB0014719D0 (en) * 2000-06-16 2000-08-09 Koninkl Philips Electronics Nv A method of providing an estimate of a location
US7443340B2 (en) 2001-06-06 2008-10-28 Global Locate, Inc. Method and apparatus for generating and distributing satellite tracking information
US20070200752A1 (en) 2001-06-06 2007-08-30 Global Locate, Inc. Method and apparatus for maintaining integrity of long-term orbits in a remote receiver
DE10121260A1 (de) * 2001-04-30 2002-11-21 Siemens Ag Navigationssystem als Erweiterung bei satellitenunterstützten Navigationsgeräten im "Indoor-Bereich"
US7548816B2 (en) 2001-06-06 2009-06-16 Global Locate, Inc. Method and apparatus for generating and securely distributing long-term satellite tracking information
US8358245B2 (en) 2001-06-06 2013-01-22 Broadcom Corporation Method and system for extending the usability period of long term orbit (LTO)
US6651000B2 (en) 2001-07-25 2003-11-18 Global Locate, Inc. Method and apparatus for generating and distributing satellite tracking information in a compact format
US6965754B2 (en) 2001-10-09 2005-11-15 Motorola, Inc. Satellite positioning system receiver with reference oscillator circuit and methods therefor
US7656350B2 (en) 2001-11-06 2010-02-02 Global Locate Method and apparatus for processing a satellite positioning system signal using a cellular acquisition signal
US6501340B1 (en) * 2002-02-11 2002-12-31 Acr Electronics, Inc. Oscillator with frequency stabilizing circuit and method of constructing same
GB0310410D0 (en) 2003-05-07 2003-06-11 Koninkl Philips Electronics Nv A method of determining a GPS position fix and a GPS receiver for the same
KR20070004231A (ko) * 2005-07-04 2007-01-09 삼성전기주식회사 지.피.에스 수신기
CN103630921B (zh) * 2013-06-07 2016-01-20 中国科学院光电研究院 一种用于高空气球载荷回收定位的装置

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JPH0616888U (ja) * 1992-06-12 1994-03-04 東京コスモス電機株式会社 差動ｇｐｓ用固定局、移動体用ｇｐｓ測位機、ナビゲーション装置、及びｇｐｓ測位機用ラジオ受信機
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WO1996022546A1 (fr) * 1995-01-17 1996-07-25 The Board Of Trustees Of The Leland Stanford Junior University Systeme et procede de reference gps differentiel longue portee

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Also Published As

Publication number Publication date
KR19990067119A (ko) 1999-08-16
JPH11514749A (ja) 1999-12-14
GB9618067D0 (en) 1996-10-09
WO1998009181A1 (fr) 1998-03-05

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