WO2011110386A1 - Systeme de positionnement par pseudolites fonctionnant en mode assiste - Google Patents
Systeme de positionnement par pseudolites fonctionnant en mode assiste Download PDFInfo
- Publication number
- WO2011110386A1 WO2011110386A1 PCT/EP2011/051542 EP2011051542W WO2011110386A1 WO 2011110386 A1 WO2011110386 A1 WO 2011110386A1 EP 2011051542 W EP2011051542 W EP 2011051542W WO 2011110386 A1 WO2011110386 A1 WO 2011110386A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- pseudolites
- receiver
- satellite
- satellites
- spreading codes
- Prior art date
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
- G01S19/03—Cooperating elements; Interaction or communication between different cooperating elements or between cooperating elements and receivers
- G01S19/10—Cooperating elements; Interaction or communication between different cooperating elements or between cooperating elements and receivers providing dedicated supplementary positioning signals
- G01S19/11—Cooperating elements; Interaction or communication between different cooperating elements or between cooperating elements and receivers providing dedicated supplementary positioning signals wherein the cooperating elements are pseudolites or satellite radio beacon positioning system signal repeaters
-
- 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
- G01S19/25—Acquisition or tracking or demodulation of signals transmitted by the system involving aiding data received from a cooperating element, e.g. assisted GPS
- G01S19/258—Acquisition or tracking or demodulation of signals transmitted by the system involving aiding data received from a cooperating element, e.g. assisted GPS relating to the satellite constellation, e.g. almanac, ephemeris data, lists of satellites in view
Definitions
- the present invention relates to a system allowing an object equipped with a suitable receiver to determine its position in a stressed zone.
- the positioning system according to the present invention is based on the use of pseudolites.
- pseudolites contraction of pseudo-satellites, are devices operating according to the same principles as satellites belonging to satellite constellations implemented in the context of satellite navigation systems, known by the acronym GNSS, for Global Navigation Satellite System, such as the GPS system, for Global Positioning System in English, or the Galileo system.
- GNSS Global Navigation Satellite System
- GPS system for Global Positioning System in English
- Galileo system for Global Navigation Satellite System
- pseudolites are deployed on the ground. Typically; they can be distributed in a building, and generally, in so-called constrained areas.
- pseudolite positioning systems lie in the fact that said pseudolites emit positioning signals whose format is identical or similar to that of the messages emitted by the satellites of a satellite navigation system.
- each pseudolite is generally assigned an identifier corresponding to that of a satellite. In the context of satellite constellations, these identifiers are referred to as spreading codes, as known to those skilled in the art.
- the range of signals emitted by pseudolites is variable; it depends on their power, and their use. Objects equipped with suitable receivers can acquire these positioning signals.
- Pseudolite positioning systems are generally deployed in "constrained" zones. It can be, typically, buildings within which the positioning signals emitted by satellites in orbit around the Earth can not be acquired, because of the masking produced by walls, ceilings ... etc. . These may be areas not covered by the satellite navigation system considered. In general, a constrained zone will be defined as being a zone in which positioning signals emitted by satellites can not be correctly acquired. On the other hand, it is possible to speak of an "open zone" in areas where positioning signals emitted by satellites can be acquired by a suitable receiver.
- the satellites which a receiver can theoretically receive positioning signals because of the adequate relative position between said satellites and said receiver, are said to be “visible” of the receiver, while the other satellites of the constellation are said “Not visible”.
- These consecrated terms, "visible” and “not visible” are usable in the case of pseudolites.
- Satellite positioning systems are often complemented by an assistance system.
- This technology is well known to those skilled in the art as Assisted-GNSS.
- helper server whose role is to send information to the receiver about the constellation of satellites, such as the position of visible satellites, and other aids facilitating the processing of the positioning signals.
- a pseudolite positioning system may also present such a helper server.
- this assistance server In “assisted” mode, this assistance server usually calculates the position of the receiver from the pseudo-distance calculations it provides. This mode of operation is also well known to those skilled in the art under the term MS-Assisted mode, or UE-Assisted respectively Mobile Station-assisted or User Equipment-Assisted.
- WiFi positioning techniques are known, but this solution is only acceptable in static environments, and requires specific hardware deployments for localization in a constrained area, as well as as relatively heavy calibration phases.
- known pseudolite positioning systems have a number of disadvantages. In particular, they do not make it possible to move from a constrained zone to an open zone and vice versa, in a continuous and autonomous manner. On the other hand, they generally do not allow cold start, without knowledge of the initial position of the receiver. Indeed, the known systems generally involve the use of receivers designed specifically for operation in a stressed zone and the acquisition of positioning signals emitted by pseudolites.
- the receiver In other cases, they require an intervention on the receiver so that it begins to acquire signals emitted by pseudolites, which are identified by specific spreading codes, potentially unknown to the receivers dedicated to a use of the satellites and knowing only the spreading codes of said satellites.
- pseudolites which are identified by specific spreading codes, potentially unknown to the receivers dedicated to a use of the satellites and knowing only the spreading codes of said satellites.
- the operating modes in the constrained zone and in the open zone are generally not compatible, in the sense that they can not be active simultaneously.
- an important constraint to be considered lies in the fact that satellite spreading codes belonging to satellite constellations are reserved for said satellites. It is not possible to use other codes without having to design specific receivers because the market receivers are designed to acquire positioning signals from the satellites.
- An object of the invention is to overcome these drawbacks by proposing a pseudolite positioning system able to operate with standard receivers that can transparently acquire, from the point of view of the receiver, positioning signals emitted by pseudolites such as these were positioning signals from satellites belonging to a satellite constellation of a satellite navigation system.
- the general principle of the invention thus consists in decoying the receiver in such a way that when it acquires the positioning signals emitted by pseudolites equipping the constrained zone in which it is located, said receiver has the impression that it normally acquires signals emitted by visible satellites. This is made possible by the system described in claim 1.
- the subject of the invention is a system for positioning an object equipped with a receiver, comprising a set of pseudolites emitting positioning signals, and distributed in a constrained zone, and assistance means capable of communicating with said receiver and calculating the position of the object, and a server adapted to dynamically configure the set of pseudolites, said pseudolites each further having a spreading code corresponding to that of a satellite belonging to a constellation of satellites of a satellite navigation system, the dynamic configuration of the pseudolites by the server being such that the spreading codes of said pseudolites correspond to satellite spreading codes of the satellite constellation not visible to the receiver of the object,
- the means of assistance communicate to said receiver a list of spreading codes intended to be those of satellites visible by said receiver but actually corresponding to the spreading codes of the set of pseudolites, so as to decoy the receiver that can acquire the positioning signals issued by pseudolites and communicate with the assistance means so that they calculate the position of the object.
- the position of each pseudolite of the set of pseudolites in the stressed zone being known by the assistance means is calculated by triangulation, starting from the known positions of the pseudolites and pseudo-distances measurements made by the receiver.
- the assistance means also communicate to said receiver an erroneous current time corresponding to the current time offset by an offset so that the receiver
- the ephemeris consultant determines that the pseudolite spreading codes correspond to satellite spreading codes of the satellite constellation expected to be visible by said receiver.
- the pseudolites emit, at the current time, positioning signals identical to the positioning signals emitted by the satellites of the satellite constellation from which they borrow the spreading code at the erroneous current time.
- the assistance means also communicate to said receiver a flag of non-integrity for all the satellite spreading codes of the satellite constellation not assigned to pseudolites.
- the server implements the assistance means, through a suitable programming.
- Figure 1 the diagram of an example of disposition around the Earth satellites of a satellite navigation system
- Figure 2 the schematic representation of the principle of operation of a satellite navigation system assisted mode.
- the figure illustrates the definition given previously, and well known to those skilled in the art, of the terms "visible satellite” and "non-visible satellite”.
- point A located on the surface of the Earth, only SV satellites are visible, while SN satellites are not visible.
- SN satellites are not visible.
- only positioning signals emitted by visible SV satellites can be acquired by a receiver placed at point A.
- the pseudolite positioning system implements an assistance server controlling all the pseudolites equipping the constrained zone considered, in which the object is located. to position.
- This assistance server is programmed in particular to provide the function of dynamically allocating a spreading code to each of the pseudolites of the constrained zone.
- FIG. 2 represents the general principle of an "assisted" mode of operation of a satellite navigation system, or Assisted-GNSS as mentioned above.
- the assistance server S collects information transmitted by the satellites of the satellite constellation SAT belonging to a satellite navigation system and, optionally, information transmitted by other satellites, by example geostationary satellites G belonging to a data collection system.
- the assistance server S uses this information to be able to provide on demand to a receiver R assistance data such as:
- the principle of the invention is to decoy the receiver R of the object that is to be positioned by appropriate programming of the assistance server S.
- the assistance server S is programmed to dynamically assign the pseudolites spreading codes which are those of satellites not visible from the constraint zone considered. This is possible because the assistance server S has the knowledge of the position of all the satellites of the satellite constellation SAT considered and corresponding ephemeris. This point is essential in order to avoid any risk of interference, on the one hand vis-à-vis users outside the constrained zone, and on the other hand vis-à-vis real satellites at the level of zones in which positioning signals emitted by satellites can be received although one is in a stressed zone: for example, inside a building, these may be areas near windows. It may not be possible to discern the positioning signals emitted by pseudolites from those emitted by satellites.
- the assistance server S provides the receiver R with modified assistance data in order to decoy the said receiver R.
- This modified data provided by the helper server includes:
- a time reference intended to correspond to the current time called Time Of Week according to the English term, but equal to the current time offset by an offset, so that, in the case where the receiver R has stored in its internal memory the almanacs of the satellite constellations for the purpose of autonomously determining the list of visible satellites, said receiver does not detect any inconsistency between the list of visible satellites - actually corresponding to the list of visible pseudolites provided by the assistance server S - and the list of visible satellites that he would be able to determine on his own.
- the applied offset must therefore be appropriately selected, so that the pseudolite spreading codes correspond to satellite spreading codes expected to be visible at the current modified time, equal to the current time. offset from said offset.
- a flag of non-integrity of the satellites supposed to be not visible at the current time modified but can in practice be visible at the actual current time.
- a flag of non-integrity is interpreted by a receiver R as meaning that the signals emitted by the satellites concerned by the flag of non-integrity are erroneous and must not be taken into account.
- Such a non-integrity flag concerning all the satellites whose spreading code has not been assigned to a pseudolite can therefore be broadcast to the receiver R. In this way, the receiver R will not seek to acquire these satellites and will save energy; moreover, there will be no risk of conflict in the case of position calculation from positioning signals derived from both pseudolites and SV satellites.
- the calculation of the pseudo-distances and the determination of the position of the receiver are preferably carried out by the assistance server or any adapted computer.
- the R-receiver does not have to manipulate the position information of the pseudolites.
- the assistance server S implementing the broadcast of modified assistance data may consist of separate means comprising assistance means calculating the modified assistance data to be broadcast and a server for broadcasting said assistance data. changed.
- the main advantage of the invention is to propose a pseudolite positioning solution in a constrained zone which is transparent for most standard receivers able to acquire positioning signals in the context of a global satellite navigation system. No hardware modification or special software is developed to implement the recommended solution, which is based on a programming and an original configuration of a helper server to lure said receivers.
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- 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)
Abstract
Description
Claims
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP11701684.0A EP2545398B1 (fr) | 2010-03-12 | 2011-02-03 | Systeme de positionnement par pseudolites fonctionnant en mode assiste |
JP2012556425A JP5874132B2 (ja) | 2010-03-12 | 2011-02-03 | 補助されたモードにおいて動作する擬似衛星を用いた位置決定システム |
KR1020127023895A KR101889105B1 (ko) | 2010-03-12 | 2011-02-03 | 보조 모드에서 동작하는 의사위성들을 이용하는 포지셔닝 시스템 |
US13/634,542 US20130009815A1 (en) | 2010-03-12 | 2011-02-03 | Positioning system using pseudolites operating in assisted mode |
CA2792660A CA2792660C (fr) | 2010-03-12 | 2011-02-03 | Systeme de positionnement par pseudolites fonctionnant en mode assiste |
SG2012054516A SG182681A1 (en) | 2010-03-12 | 2011-02-03 | Positioning system using pseudolites operating in assisted mode |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1000998 | 2010-03-12 | ||
FR1000998A FR2957427B1 (fr) | 2010-03-12 | 2010-03-12 | Systeme de positionnement par pseudolites fonctionnant en mode assiste |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2011110386A1 true WO2011110386A1 (fr) | 2011-09-15 |
Family
ID=42992216
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2011/051542 WO2011110386A1 (fr) | 2010-03-12 | 2011-02-03 | Systeme de positionnement par pseudolites fonctionnant en mode assiste |
Country Status (8)
Country | Link |
---|---|
US (1) | US20130009815A1 (fr) |
EP (1) | EP2545398B1 (fr) |
JP (1) | JP5874132B2 (fr) |
KR (1) | KR101889105B1 (fr) |
CA (1) | CA2792660C (fr) |
FR (1) | FR2957427B1 (fr) |
SG (1) | SG182681A1 (fr) |
WO (1) | WO2011110386A1 (fr) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104703274B (zh) * | 2013-12-04 | 2019-06-18 | 中兴通讯股份有限公司 | 一种带内伪卫星无线定位方法、系统及装置 |
CN106680852B (zh) * | 2017-03-20 | 2019-02-12 | 武汉大地线科技有限公司 | 基于卫星导航信号欺骗式干扰的定位方法及系统 |
US11709273B2 (en) * | 2018-04-12 | 2023-07-25 | Aerostar International, Llc | Stratospheric position, navigation, and timing system |
CN110764126B (zh) * | 2019-11-11 | 2021-08-03 | 北京航空航天大学 | 一种gps信息缺失情况下的无人车导航方法及系统 |
US11500108B2 (en) * | 2020-10-29 | 2022-11-15 | Tupaia Ltd. | System and method for navigation with limited satellite coverage area |
CN112415557B (zh) * | 2020-12-14 | 2022-05-17 | 中国电子科技集团公司第五十四研究所 | 一种基于云平台的伪卫星室内多源融合定位方法 |
Citations (3)
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US6198432B1 (en) * | 1999-09-29 | 2001-03-06 | Trimble Navigation Limited | Method and apparatus for automatic and autonomous assignment of PRN codes to a multiplicity of pseudolites |
US20050086001A1 (en) * | 2003-08-14 | 2005-04-21 | Samsung Electronics Co., Ltd. | System and method for assigning pseudo random noise codes to pseudo satellites |
EP2012136A1 (fr) * | 2006-04-04 | 2009-01-07 | GNSS Technologies Inc. | Systeme de production d'informations positionelles, appareil de production d'informationspositionelles et emetteur |
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JPH1172548A (ja) * | 1997-08-28 | 1999-03-16 | Mitsubishi Heavy Ind Ltd | 位置検出システム |
US6336076B1 (en) * | 1998-08-24 | 2002-01-01 | Rockwell Collins, Inc. | Long range GNSS ephemeris data transfer method and apparatus using the same |
US6564064B1 (en) * | 1999-12-01 | 2003-05-13 | Trimble Navigation Limited | Cellular telephone using pseudolites for determining location |
US6429811B1 (en) * | 2000-02-15 | 2002-08-06 | Motorola, Inc. | Method and apparatus for compressing GPS satellite broadcast message information |
KR100351962B1 (ko) * | 2000-04-25 | 2002-09-12 | 기창돈 | 의사위성을 이용한 항법 시스템 |
US6597988B1 (en) * | 2000-09-22 | 2003-07-22 | Sirf Technology, Inc. | Network assisted pseudolite acquisition for enhanced GPS navigation |
US6429809B1 (en) * | 2001-01-30 | 2002-08-06 | Qualcomm Incorporated | Method and apparatus for determining location using a coarse position estimate |
US7006834B2 (en) * | 2001-10-29 | 2006-02-28 | Qualcomm Incorporated | Base station time calibration using position measurement data sent by mobile stations during regular position location sessions |
KR20050017564A (ko) * | 2003-08-14 | 2005-02-22 | 삼성전자주식회사 | 통신망을 통해 통제되는 의사위성 |
US7522101B2 (en) * | 2006-02-28 | 2009-04-21 | Sony Ericsson Mobile Communications Ab | Positioning system for portable electronic devices |
JP4952328B2 (ja) * | 2007-03-27 | 2012-06-13 | セイコーエプソン株式会社 | Gps測位装置、電子機器、制御方法、プログラム及び記憶媒体 |
-
2010
- 2010-03-12 FR FR1000998A patent/FR2957427B1/fr not_active Expired - Fee Related
-
2011
- 2011-02-03 KR KR1020127023895A patent/KR101889105B1/ko active IP Right Grant
- 2011-02-03 EP EP11701684.0A patent/EP2545398B1/fr active Active
- 2011-02-03 CA CA2792660A patent/CA2792660C/fr not_active Expired - Fee Related
- 2011-02-03 US US13/634,542 patent/US20130009815A1/en not_active Abandoned
- 2011-02-03 JP JP2012556425A patent/JP5874132B2/ja not_active Expired - Fee Related
- 2011-02-03 WO PCT/EP2011/051542 patent/WO2011110386A1/fr active Application Filing
- 2011-02-03 SG SG2012054516A patent/SG182681A1/en unknown
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6198432B1 (en) * | 1999-09-29 | 2001-03-06 | Trimble Navigation Limited | Method and apparatus for automatic and autonomous assignment of PRN codes to a multiplicity of pseudolites |
US20050086001A1 (en) * | 2003-08-14 | 2005-04-21 | Samsung Electronics Co., Ltd. | System and method for assigning pseudo random noise codes to pseudo satellites |
EP2012136A1 (fr) * | 2006-04-04 | 2009-01-07 | GNSS Technologies Inc. | Systeme de production d'informations positionelles, appareil de production d'informationspositionelles et emetteur |
Also Published As
Publication number | Publication date |
---|---|
JP2013522582A (ja) | 2013-06-13 |
CA2792660A1 (fr) | 2011-09-15 |
FR2957427B1 (fr) | 2012-05-25 |
FR2957427A1 (fr) | 2011-09-16 |
EP2545398B1 (fr) | 2013-12-04 |
JP5874132B2 (ja) | 2016-03-02 |
CA2792660C (fr) | 2017-10-31 |
US20130009815A1 (en) | 2013-01-10 |
KR101889105B1 (ko) | 2018-08-16 |
EP2545398A1 (fr) | 2013-01-16 |
KR20130006615A (ko) | 2013-01-17 |
SG182681A1 (en) | 2012-08-30 |
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