WO2005012937A1 - Method for the satellite-based determination of the position of a user station, user station, device, and computer program - Google Patents

Method for the satellite-based determination of the position of a user station, user station, device, and computer program Download PDF

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Publication number
WO2005012937A1
WO2005012937A1 PCT/EP2004/051281 EP2004051281W WO2005012937A1 WO 2005012937 A1 WO2005012937 A1 WO 2005012937A1 EP 2004051281 W EP2004051281 W EP 2004051281W WO 2005012937 A1 WO2005012937 A1 WO 2005012937A1
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WO
WIPO (PCT)
Prior art keywords
subscriber station
ue2
satellites
signals
information
Prior art date
Application number
PCT/EP2004/051281
Other languages
German (de)
French (fr)
Inventor
Volker Sommer
Original Assignee
Siemens Aktiengesellschaft
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
Priority to DE10335318.6 priority Critical
Priority to DE10335318 priority
Application filed by Siemens Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Publication of WO2005012937A1 publication Critical patent/WO2005012937A1/en

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Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01SRADIO 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
    • G01S19/00Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
    • G01S19/01Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
    • G01S19/13Receivers
    • G01S19/24Acquisition or tracking or demodulation of signals transmitted by the system
    • G01S19/25Acquisition or tracking or demodulation of signals transmitted by the system involving aiding data received from a cooperating element, e.g. assisted GPS
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01SRADIO 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
    • G01S19/00Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
    • G01S19/01Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
    • G01S19/03Cooperating elements; Interaction or communication between different cooperating elements or between cooperating elements and receivers
    • G01S19/05Cooperating elements; Interaction or communication between different cooperating elements or between cooperating elements and receivers providing aiding information
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01SRADIO 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
    • G01S19/00Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
    • G01S19/38Determining a navigation solution using signals transmitted by a satellite radio beacon positioning system
    • G01S19/39Determining a navigation solution using signals transmitted by a satellite radio beacon positioning system the satellite radio beacon positioning system transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
    • G01S19/42Determining position
    • G01S19/50Determining position whereby the position solution is constrained to lie upon a particular curve or surface, e.g. for locomotives on railway tracks
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01SRADIO 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
    • G01S19/00Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
    • G01S19/01Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
    • G01S19/13Receivers
    • G01S19/34Power consumption
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01SRADIO 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
    • G01S5/00Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
    • G01S5/0009Transmission of position information to remote stations
    • G01S5/0018Transmission from mobile station to base station
    • G01S5/0036Transmission from mobile station to base station of measured values, i.e. measurement on mobile and position calculation on base station
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01SRADIO 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
    • G01S5/00Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
    • G01S5/0009Transmission of position information to remote stations
    • G01S5/0045Transmission from base station to mobile station
    • G01S5/0054Transmission from base station to mobile station of actual mobile position, i.e. position calculation on base station

Abstract

Disclosed is a method for the satellite-based determination of the position of a user station (UE2). According to said method, the user station (UE2) receives a piece of information (I) from a device (SMLC) of a radio communication system, which indicates from how many satellites the user station (UE2) is to receive signals (S6, S7, S8, S9) for determining the position thereof, and the user station (UE2) receives corresponding signals (S6, S7, S8, S9) only from the indicated number of satellites in order for the position to be determined thereafter.

Description

description

A method for satellite-based position determination of a subscriber station and subscriber station, apparatus and computer program

The invention relates to a process for the satellite-based position determination of a subscriber station and a corresponding subscriber station, a corresponding apparatus and a corresponding computer program.

In a conventional satellite-based position determination, for example by GPS (Global Positioning System), requires a three-dimensional position determination for a subscriber station that the distance is determined by the subscriber station to at least four visible satellites. Distance measurements are made indirectly, via transit time measurements of known sequences CDMA (CDMA: Code Division Multiple Access) and speed of propagation by means of the known 'electromagnetic waves. Must be to determine the signal propagation times from the satellite to the subscriber station precisely both the time of transmission of the signals and the reception time in the subscriber station known very accurately. During the time of transmission, the fol- constricting called GPS time can be decoded by a body having a complete GPS receiver subscriber station from the signals of the satellites and thus can be provided for positioning the subscriber station to be known, the local time base is in the subscriber station, that is, the exact time of reception, in

Normally not known and therefore must be obtained by means of additional measurement. For this reason, a distance measurement to four satellites is required rather than three satellites for a three-dimensional position determination.

Subscriber stations known radio communication systems (for example, according to the GSM Global System for Mobile Com- 2003P11536

cations) and UMTS (Universal Mobile Telecommunications System) standard, do not have to be equipped with a complete GPS E pfänger as they decode any information from the signals of the satellites. Therefore, for the positioning of such subscriber stations a technique called Assisted-GPS method is used. When assisted GPS, the subscriber station only has to perform transit time measurements by receiving so-called pseudo ranges to multiple satellites. Therefore, the name of pseudoranges is that due to the limited length of the CDMA sequences of the satellite signals, the running time modulo 1 ms is known only between the satellite and the subscriber station. To determine the position, further information is required in addition to the signals from the satellites, for example, the navigation data (almanac and ephemeris) of the satellites. These are determined in the radio communication system, which on the one hand the measuring time in the subscriber station can be drastically reduced and on the other the required receiving strength of the signals from the satellites is much lower than in a normal GPS. This enables in particular also a position determination in buildings.

In radio communication systems with Assisted GPS, the GPS time is not decoded by the subscriber station of the ra munika- tion system from the signals of the satellites. The

Therefore, GPS time must be determined either by the radio communication system or the subscriber stations must receive signals from a fifth satellite, nen to determine the unknown GPS time by means of these additional measurement to kön-.

Capturing at least five satellite signals requires extra effort and metrological measurement time. In certain locations it may even be possible that a position determination can not be performed if there is no way in these places, to receive signals from at least five satellites. Alternatively the GPS time in the radio 2003P11536

communication system is determined, this requires that each radio coverage area of ​​the radio communication system, a reference receiver is installed, each determines the GPS time and used for subscriber stations that are located in this radio coverage area.

In some radio communication systems, subscriber stations thus be used which are formed for determining a position for reception of signals from five satellites, while used in other radio communication systems, subscriber stations which are adapted to receive signals from four satellites.

The object of the invention is a method for satellitenbasier- th position determination of a subscriber station and a

to provide subscriber station, an apparatus and a computer program, whereby the position determination of the subscriber station is possible in any wireless communication systems with minimal effort.

This object is achieved with the method, the subscriber station, the apparatus and the computer program according to the independent claims.

Advantageous embodiments and further developments of the invention are subject of the dependent claims.

In the inventive method for satellite-based position determination of a subscriber station, the subscriber station receives information of an apparatus of a radio communication system, which can be removed, of which number of satellites, the subscriber station is to receive signals for position determination, and the subscriber station receives only the specified number of satellite- th corresponding signals for subsequent positioning. The information allows the subscriber station to determine the position exactly as much energy and measuring time to 2003P11536

consume, as is required for the reception of signals by the specified number of satellites. The specified number may depend on which positioning method is implemented in the radio communication system. The subscriber station is made possible by the invention to be used in any wireless communication systems, which differ by the number of satellites from which signals for determining the position of the subscriber station must be received. With the invention (for different radio coverage areas for. Example, will continue to enable light,

Radio cells) of a radio communication system and specify an individual number of satellites for each position determination.

A further advantage of the invention is that the

Subscriber station does not receive signals from satellites for subsequent position determining when signals may be received by less than the specified number of satellites. Unnecessary measurements of signals of too low a check number of satellites that do not allow position determination, and, optionally, a signaling information obtained from the signals to a positioning unit of the radio communication system is thus avoided. This situation can occur for example when the Teilnehmerstati- on maintaining visual contact with a lower than specified number of satellites or when signals from satellites can not be received correctly. The latter means, for example, that a correlation of a known reference signal in the subscriber station performs a Israel by a satel- received signal for position determination at any usable results. The result of this correlation, a so-called pseudo-range but it is required for positioning.

The received by the device information may either explicitly indicate the number of satellites or implicitly encode, for example, by known bit sequences. 2003P11536

In the event that the information at the time of position determination is not present or not, or has only been received in error, it is advantageous if the Teilnehmersta- tion whenever it does not receive the information prior to be carried out position determination signals for determining the position of an in receives pre-determined number of satellites. This ensures that it is possible to carry out a position determination in each case. Examples play as may be the pre-established number of five satellites. Based on signals from five satellites and based on the navigation data of the satellites the signals of the satellites can be calculated with Assisted-GPS coordinates of the subscriber station, that is, the longitude, latitude and altitude as well as the transmit and receive timing.

In the inventive method for satellite-based position determination of a subscriber station apparatus of a radio communication system sends a message to the subscriber station, which can be removed, of which number of satellites, the subscriber station is to receive signals for position determination. For positioning a different number of satellites required depending on the boundary conditions of the radio communication system. The home allows formation according to the invention is that the space required for the determination of position measurement and computation complexity can be reduced to a minimum. The information can be selected so that the minimum number of required satellite is signaled.

In an advantageous embodiment of the invention the number of satellites to be received by at least one known for a radio coverage area of ​​the radio communication system Additional information depends, where the participants is merstation in the radio coverage area. Under a radio coverage area is for example a radio cell of a mobile radio system or in general to the portion 2003P11536

understand in which a transmitting station of the radio communication system, for example a base station or a further subscriber station can exchange data with the subscriber station via radio waves payload and / or signaling data.

Is as additional information a time reference of a previous position determination known z. B. a particular in a time base of the radio coverage area receiver ngszeitpunkt signals from satellites, so the basis of a measured in the same time base reception time of signals from satellites, the current position determining the time difference between the two position determinations can be calculated. From the time difference and a determined at the preceding position determination time of transmission of the signals of the satellites, the transmission timing of the signals of the satellites for the current position determination can be calculated. Therefore, the current transmission time must not be determined by means of signals from satellites, such that the number of required satellites, for example, five satellites can be reduced by a satellite.

Alternatively or additionally, the number of satellites can be reduced to a satellite, if a value can only occur to the geographic fish height in the radio coverage area of ​​subscriber stations. The geographical height must therefore not based on signals from satellites to determine but is taken into account as additional information. the number of satellites can be reduced, alternatively or additionally to a satellite also when rich consists Funkversorgungsbe- as additional information, a functional relationship between the geographical length and width.

All said additional information together, that is the time reference, the constant geographical height and the functional relationship between geographical length and width, thus allowing to dispense with three satellites. Without the transmitted information signals from five satellites require 2003P11536

7 sary to obtain a solvable system of equations, ie to carry out a position determination. This is apparent, therefore, that in addition to the unknown coordinates of the fielding timing geographical longitude, latitude and altitude, and the transmit and receive the signals of the satellites must be calculated. By means of the transmitted information are only two satellites are required in an extreme case, if all the additional information mentioned above apply.

The subscriber station according to the invention, the inventive apparatus and computer program of the invention have all the characteristics that are required for carrying out the inventive methods.

The invention is explained below with reference to an embodiment shown in the Figure 1 embodiment in more detail.

Figure 1 shows an inventive radio communication system in which a position determination according to the invention a partial subscriber station is performed.

A subscriber station, each station receiving signals or may transmit. A subscriber station is for example a mobile phone or a portable or fixed location- device to transmit video and / or sound data, for fax, short message service SMS and e-mailing and Internet access. It is therefore a general transmitting and / or receiving unit of a radio communications system.

The invention may advantageously be used in any wireless communication systems. Under Radio communication systems are to be understood in which data transmission occurs between stations via a radio interface. The data transmission can be both bidirectional and unidi- tional. A radio communication system are especially any mobile radio systems, for example according to the GSM or 2003P11536

the UMTS standard. Future mobile radio systems, for example, the fourth generation to be understood as radio communication system.

The invention is described using the example of a mobile radio system according to the UMTS standard, without being limited thereto.

Figure 1 schematically shows an inventive system cation Funkkommuni-. In the radio communication system, a called positioning SMLC device that controls a position determination of the subscriber stations in the radio communication system is located. can in the positioning SMLC a transmitting and receiving unit SE is present, the data needed for a position determination, for example navigation data from to be used for the positioning satellites, at base stations and from there to be localized subscriber stations to forward. Calculations for determining the position of a subscriber station in the radio communication system carried out, the transmitting and receiving unit SE is able to receive the necessary data from the subscriber station and perform the calculations. The required data are forwarded via a base station and optionally further stations of the radio communication system to the positioning unit.

A first subscriber station UE1 is located in a first radio coverage area of ​​a base station NodeB FBI. The radio communication system performs location measurement by means of assisted GPS. The time base synchronized, used for the positioning satellite, of which in figure 1 five satellites SAT1, SAT2, SAT3, SAT4, SAT5 are shown, is not known in radio communication system. The need for a satellite-based positioning transmission time of signals from the satellites SAT1, SAT2, SAT3, SAT4, SAT5 therefore must be decoded from the signals or made available in other ways. In a first for the partial 2003P11536

subscriber station UE1 performed first position determining receives the first subscriber station UEL simultaneously each a signal Sl, S2, S3, S4, S5 of each of the five satellites SAT1, SAT2, SAT3, SAT4, SAT5. Based on the five signals Sl, S2, S3, S4, S5, the position of the first subscriber station UEL can be determined either in the first subscriber station UEL or in the positioning SMLC. To determine the position in the positioning SMLC required for positioning information via the base station NodeB to the positioning unit SMLC be forwarded.

Upon receipt of the five signals Sl, S2, S3, S4, S5, the first subscriber station UEL also determines a first receiving timing Tl for the five signals Sl, S2, S3, S4, S5 in a time base of said first radio coverage area FBI and divides the first reception time Tl the base station NodeB with. The base station NodeB transmits the first reception time Tl for storing to the positioning SMLC.

In the first position determination of the first subscriber station UEL is a first transmission time in addition to their position, that is a first GPS time with the value GPS1, the signals Sl, S2, S3, S4, S5 are determined and stored, for example, in the positioning SMLC. If a second position determination of the first subscriber station UEL or any other subscriber station in the first radio coverage area FBI, so may be made of the measured at the first position-determining first reception time Tl and the value GPS1 the first GPS time a second GPS time with the value GPS2 to time of the second position determination is calculated. For this, a value of a second reception time T2 in the time base of the first radio coverage area FBI is measured for signals from satellites which are received in the second position determination. It then applies: GPS2 = GPS1 + (T2-T1).

By calculating the value GPS2 the second GPS time it is no longer required in the second Positionsbestim- 2003P11536

to receive 10 mung signals from five satellites, but it is sufficient to receive signals from four satellites. However, the time difference between two position determinations may only be so large that a calculation error of the two-th GPS time, which arises due to an inaccurate because time drifting, time based on the first radio coverage area FBI gives a calculation error of the position of the first subscriber station UEL, the is within predetermined tolerances. Typically, the calculation error of the second GPS time is then tolerated when the term drift in the first radio coverage area FBI does not exceed a few microseconds. Is the time difference between two position determinations, however, too large, must be received in the subsequent positioning signals from five satellites. to be received by as many satellite signals transmitted over the positioning SMLC and the base station NodeB to the corresponding subscriber station is notified by a corresponding information subscriber stations.

In a second radio coverage area FB2 is a second subscriber station UE2 whose position is to be determined. For the second radio coverage area FB2 a recom- were determined start time point in a time base of the second radio coverage area FB2 and a GPS time and stored in the positioning unit SMLC already in a previous positioning. A GPS time for a currently performed position determination can therefore be calculated search as described above using data from the previous position fixes. To determine the position of the second subscriber station UE2 thus it is sufficient to receive signals from only four satellites. For this reason, the positioning SMLC sends a corresponding information I through the base station NodeB to the second Teilnehmersta- tion UE2. The information I may refer to the second subscriber station UE2 that they must receive signals from just four satellites. 2003P11536

11

Without this information, I would have the second subscriber station UE2 signals received from a pre-established number of at least five satellites since then e- GPS time would be benfalls determined. However, this has a disadvantage if the subscriber station are available only four or even fewer satellites to receive signals and therefore no signals for position determination receives and thus no position determination is performed throughput. so the information has the advantage that positioning is not limited to a pre-established number of satellites. The number of satellites is set individually for each position determination, depending on whether and how many additional information, the radio communication system for a current positioning features.

In Figure 1, the second subscriber station UE2 receives after evaluation of the information I four signals Sβ, S7, S8, S9 of four satellite SAT2, SAT3, SAT4, SAT5. The calculation of its position is performed either subsequent to the second subscriber station UE2 itself or from the positioning SMLC. For a calculation by the second subscriber station UE2 of these are so-as the corresponding reception time notified the previously determined GPS time if necessary. Conversely, transmits the second subscriber station UE2, in a calculation of position in the positioning SMLC, all obtained from the signals of the satellites for determining the position data, such as the receiving time of signals and determined by correlating measurements pseudoranges, to the positioning SMLC.

The information I can of course also be sent to the second subscriber station UE2, if the GPS time is not known, but instead, for example, the second radio coverage area FB2 has a constant geographical height. Subscriber stations in the second Funkversor- 2003P11536

12 supply area are in this case always on the same geographical height. At a location of the second subscriber station UEL only signals from four satellites are also received as an otherwise quantity to be determined, the altitude, need not be calculated in determining position.

A constant geographical height in a radio coverage area is either already known from a radio network planning or the geographic height is set within a radio coverage area to be constant, if a plurality of position fixes have always give the same value for the geographical height at different locations of the radio coverage area.

Alternatively, the information I can also specify that only signals from three or even received by only two satellites are to be. Signals from three satellites are then sufficient for a position determination, if the GPS time is known in the radio communication system or can be calculated, and in addition, the geographical height in the radio coverage area is constant. Is beyond a functional relationship in the radio coverage area between the longitude and latitude of the position of a subscriber station, only signals from two satellites are needed.

Of course, any of these conditions alone and in any combination with the other conditions, the number of satellites required for position determination may determine.

A functional relationship within a radio coverage area can occur when a radio coverage area is a rural area where for example a railway track or a single main road extends. For position determination in such a radio coverage area can be assumed that a subscriber station on the railroad tracks or the main 2003P11536

13 road is located. The longitude / latitude can now be expressed by the latitude / longitude. This functional relationship may be particularly used when determining tion at a first positioning, it was found, for example, with five satellites that the subscriber station is actually located on the train tracks and the main road. In a further position determination can be assumed then that the subscriber station continues to follow the railroad tracks and the main road.

For generating and for emitting as well as for receiving and evaluating the information I computer programs can be used, each running in the second subscriber station UE2 in the positioning or SMLC, that are executed on a computer or processor. The computer programs can be either in a memory of the second subscriber station UE2 or the positioning SMLC loaded from there running or they are located on a data carrier, examples game as a floppy disk, a CD (Compact Disc), a DVD (Digital Versatile Disc) or a remote Server. Access is made by the second subscriber station UE2 or the positioning SMLC via a corresponding reading device or a data line or a radio link.

The second subscriber station UE2 includes a receiving unit E and a processor P, wherein the receiving unit E serves for receiving the information I and the signals Sβ, S7, S8, S9 the satellite SAT2, SAT3, SAT4, SAT5 and in processor P, the information I and the signals S6, S7, S8, S9 is processed. Furthermore, the second subscriber station UE2 course has a transmitter unit with which, in the event that the position determination of the positioning unit in SMLC occurs for the position determination ER- ford variable forwards data to the positioning SMLC. 2003P11536

14

Of course, the transmitting and receiving unit of the positioning SE SMLC may also be arranged in the base station NodeB and there according to generate the information I or receive signals from subscriber stations and perform calculations to determine the position in the base station NodeB.

Claims

2003P1153615 claims
1. A method for satellite-based position determination of a subscriber station (UE2), in which - the subscriber station (UE2) an information (I) by a device (SMLC) receives a radio communication system, which can be removed, of which number of satellites, the subscriber station (UE2) signals to receive for their positioning, and - the subscriber station (UE2) only by the specified number of satellites corresponding signals (S6, S7, S8, S9) receives for subsequent position determination.
2. The method of claim 1, wherein the subscriber station (UE2) whenever it receives the information (I) does not get in front of a position determination to be carried out, receives signals for determining the position of a predetermined number of satellites.
sends 3. The method for satellite-based position determination of a subscriber station, in which a device (SMLC) of a radio communication system, an information (I) to the subscriber station (UE2), which is removable from which number of satellites, the subscriber station (UE2) signals for their to receive positioning.
4. The method of claim 3, wherein the number of satellites to be received depends known of at least egg ner for a radio coverage area (FB2) of the radio communication system auxiliary information, wherein the subscriber station is located (UE2) in the radio coverage area (FB2).
5. The method of claim 4, wherein a time reference of a previous positioning is used as additional information. 2003P11536
16
6. The method of claim 4 or 5, wherein the information about a constant height for geographical positions of subscriber stations in the radio coverage range (FB2) is used as additional information.
7. The method of claim 4, 5 or 6, wherein a functional relationship between the longitude and latitude is used as additional information.
8. subscriber station (UE2) to a receiving unit (E)
- for receiving an information (I) by a device (SMLC) of a radio communication system, which can be removed, of which the number of satellites tion Teilnehmersta- (UE2) to receive signals for position determination, and
- for receiving corresponding signals (S6, S7, S8, S9) for a subsequent position determination only by the specified number of satellites.
9. The device (SMLC) for a radio communication system having a transmitter unit (SE) for transmitting information (I) to a subscriber station (UE2), which is removable from which number of satellites, the subscriber station (UE2) signaled le received for their positioning should.
10. A computer program which, when executed in a subscriber station (UE2),
- an information (I) by a device (SMLC) uses a radio communication system, which can be removed, of which number of satellites, the subscriber station (UE2) to receive signals for position determination, and
- receiving respective signals (Sβ, S7, S8, S9) for a subsequent position determination controlled such that the respective signals (S6, S7, S8, S9) to be received only by the specified number of satellites. 2003P11536
17
11. A computer program which, when executed in a device (SMLC) of a radio communication system, a transmitter unit (SE) so that the transmitter unit (SE), an information (I) to a subscriber station (UE2) sends, which is removable from which number (UE2) to receive signals for position determination of the satellite, the subscriber station.
PCT/EP2004/051281 2003-08-01 2004-06-29 Method for the satellite-based determination of the position of a user station, user station, device, and computer program WO2005012937A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE10335318.6 2003-08-01
DE10335318 2003-08-01

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Publication Number Publication Date
WO2005012937A1 true WO2005012937A1 (en) 2005-02-10

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Application Number Title Priority Date Filing Date
PCT/EP2004/051281 WO2005012937A1 (en) 2003-08-01 2004-06-29 Method for the satellite-based determination of the position of a user station, user station, device, and computer program

Country Status (1)

Country Link
WO (1) WO2005012937A1 (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6236937B1 (en) * 1996-04-25 2001-05-22 Sirf Technology, Inc. GPS receiver with cross-track hold
US6353412B1 (en) * 1998-03-17 2002-03-05 Qualcomm, Incorporated Method and apparatus for determining position location using reduced number of GPS satellites and synchronized and unsynchronized base stations

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6236937B1 (en) * 1996-04-25 2001-05-22 Sirf Technology, Inc. GPS receiver with cross-track hold
US6353412B1 (en) * 1998-03-17 2002-03-05 Qualcomm, Incorporated Method and apparatus for determining position location using reduced number of GPS satellites and synchronized and unsynchronized base stations

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
SHAOJUN FENG ET AL: "Assisted GPS and its impact on naivigation in intelligent transportation systems", IEEE 5TH INTERNATIONAL CONFERENCE ON INTELLIGENT TRANSPORTATION SYSTEMS, 3 September 2002 (2002-09-03), pages 926 - 931, XP010608417 *

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