EP0921511A2 - Method for transmitting position data - Google Patents
Method for transmitting position data Download PDFInfo
- Publication number
- EP0921511A2 EP0921511A2 EP98440269A EP98440269A EP0921511A2 EP 0921511 A2 EP0921511 A2 EP 0921511A2 EP 98440269 A EP98440269 A EP 98440269A EP 98440269 A EP98440269 A EP 98440269A EP 0921511 A2 EP0921511 A2 EP 0921511A2
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- EP
- European Patent Office
- Prior art keywords
- vehicles
- position data
- memories
- time
- established
- 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.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 14
- 230000015654 memory Effects 0.000 claims abstract description 10
- 230000001360 synchronised effect Effects 0.000 claims 1
- 230000004913 activation Effects 0.000 description 1
- 238000013500 data storage Methods 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
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Classifications
-
- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/123—Traffic control systems for road vehicles indicating the position of vehicles, e.g. scheduled vehicles; Managing passenger vehicles circulating according to a fixed timetable, e.g. buses, trains, trams
- G08G1/127—Traffic control systems for road vehicles indicating the position of vehicles, e.g. scheduled vehicles; Managing passenger vehicles circulating according to a fixed timetable, e.g. buses, trains, trams to a central station ; Indicators in a central station
Definitions
- the invention relates to a method for transmitting position data from Vehicles to a control center according to the preamble of claim 1.
- Accurate position data is primarily needed to ensure schedule conformity monitor and control stop displays, which is the expected waiting time until the vehicles arrive signal. For this purpose, they are especially odometric, using radio beacons or position data determined using GPS (Global Positioning System) the vehicles are queried successively and cyclically by a control center.
- GPS Global Positioning System
- the time delay between the individual queries creates a bias error, the one of the first polled vehicle during the Corresponds to the time period of a query cycle and corresponds to approx. 0 for the last queried vehicle. It means that in the central office the impression can arise that those queried first Vehicles have greater delays than the vehicles last polled exhibit. Depending on the size of the vehicle fleet, this can be for one Query cycle time required more than half a minute.
- the invention has for its object the distortion error on simple Way and for any size of vehicle fleet, in particular also to be avoided in the event of an expansion of the vehicle fleet.
- the object is characterized by the characteristic features of claim 1 solved. It is particularly advantageous that the cyclical query the position data can be retained by the control center. Yet the cyclical successive query results in a snapshot, the the actual relationships of the positions of the vehicles to each other. The simultaneously determined and in are queried position data written in a memory. The mistake that gets through the duration of a query cycle is the same for all vehicles. This allows a correction to be carried out in a simple manner. For example, after each polling cycle, the position data of vehicles that are not about to stop or at the stop, add a distance of 200 m become. This distance corresponds to the average distance during the distance traveled for the query cycle.
- the memories are preferably rewritable Data storage of small storage capacity and simplest design.
- a series of vehicles F 1 , F 2 ... F n is shown , the number n of which forms a vehicle fleet which is monitored by a control center Z.
- Central Z serves, among other things, to transmit schedule and rerouting information as well as DGPS (Differential Global Positioning System) correction data to the vehicles.
- DGPS Different Global Positioning System
- the data available in the central office Z are also increasingly being used to control stop displays (not shown) for visualizing the remaining waiting time until the next vehicle F 1 , F 2 ... F n arrives. For these applications it is necessary to know exact and time-conforming position data of the individual vehicles F 1 , F 2 ... F n .
- the central station Z asks for this position data in a polling process, that is to say the position data of the same point in time of the vehicles F 1, F 2 ... F n are transmitted to the central station Z one after the other. So that all vehicles F 1 , F 2 ... F n report their position data to the central station Z at the same time, each vehicle F 1 , F 2 ... F n has a memory S 1 , S 2 ... S n fitted.
- the polling method has access to these memories S 1 , S 2 ... S n .
- / x n , y n are sent to the control center at the same time t 1 for all vehicles F 1 , F 2 ... F n Z reported.
- This fixed point in time t 1 can be realized, for example, in that the control center Z sends a trigger signal to all vehicles F 1 , F 2 ... F n immediately before the start of the next polling cycle, which leads to a current position determination by the vehicles F 1 , F 2 ... F n is activated.
- odometric methods in which the wheel axis revolutions are evaluated, radio beacon methods or GPS or DGPS methods (global positioning system or differential global positioning system) are used for determining the position. If the vehicles F 1 , F 2 ...
- F n are equipped with GPS or DPGS receivers
- the derived system time which is absolutely the same for all GPS or DGPS receivers, can be used to determine a regular position determination Intervals are used.
- the time intervals are matched to the length of the polling cycle and correspond exactly to the interval between two polling cycles.
- the activation method described above can be used by means of a trigger signal that is generated by the control center Z. This also has the advantage that the distance between two polling cycles does not necessarily have to be constant.
- a current image can be interpolated in a simple manner, for all vehicles F 1 , F 2 ... F n , the probably unimpeded free travel ahead have, the average distance covered in the time difference ⁇ t is added to the position data.
- ⁇ t const. there is a fixed addition value.
- traffic-related or route-related peculiarities for example traffic congestion or stop area, can be taken into account.
- the invention is not limited to the exemplary embodiment specified above. Rather, a number of variants are conceivable, which even if the features are fundamentally different make use of the invention.
Landscapes
- Engineering & Computer Science (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Traffic Control Systems (AREA)
- Position Fixing By Use Of Radio Waves (AREA)
- Communication Control (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
Die Erfindung betrifft ein Verfahren zur Übermittlung von Positionsdaten
(x1/y1, x2/y2 ... xn/yn), insbesondere geographischen Koordinaten, von n
Fahrzeugen (F1, F2 ... Fn) an eine Zentrale Z, wobei die Zentrale Z eine
zyklische Abfrage der Positionsdaten (x1/y1, x2/y2 ... xn/yn) der n Fahrzeuge
(F1, F2 ... Fn) durchführt. Um Verzerrungsfehler zu vermeiden, ist vorgesehen,
daß aktuelle Positionsdaten (x1/y1, x2/y2 ... xn/yn) der Fahrzeuge (F1, F2
... Fn) zeitgleich ermittelt, und in den Fahrzeugen F1, F2 ... Fn) zugeordneten
Speichern (S1, S2 ... Sn) eingeschrieben werden, und daß die Zentrale (Z) die
Speicher (S1, S2 ... Sn) zyklisch abfragt.
Description
Die Erfindung betrifft ein Verfahren zur Übermittlung von Positionsdaten von
Fahrzeugen an eine Zentrale gemäß dem Oberbegriff des Anspruchs 1.The invention relates to a method for transmitting position data from
Vehicles to a control center according to the preamble of
Genaue Positionsdaten werden vor allem benötigt, um die Fahrplankonformität zu überwachen und zur Ansteuerung von Haltestellen-Displays, welche die voraussichtlichen Wartezeiten bis zum Eintreffen der Fahrzeuge signalisieren. Dazu werden die insbesondere odometrisch, mittels Funkbaken oder mittels GPS (Global Positioning System) ermittelten Positionsdaten der Fahrzeuge durch eine Zentrale sukzessive und zyklisch abgefragt. Durch die Zeitverzögerung zwischen den einzelnen Abfragen entsteht ein Verzerrungsfehler, der bei dem zuerst abgefragten Fahrzeug der während des Zeitraumes eines Abfragezyklus zurückgelegten Wegstrecke entspricht und bei dem zuletzt abgefragten Fahrzeug ca. 0 entspricht. Das bedeutet, daß in der Zentrale der Eindruck entstehen kann, daß die zuerst abgefragten Fahrzeuge gegenüber den zuletzt abgefragten Fahrzeugen größere Verspätungen aufweisen. Je nach Größe der Fahrzeugflotte kann der für einen Abfragezyklus erforderliche Zeitraum mehr als eine halbe Minute erfordern.Accurate position data is primarily needed to ensure schedule conformity monitor and control stop displays, which is the expected waiting time until the vehicles arrive signal. For this purpose, they are especially odometric, using radio beacons or position data determined using GPS (Global Positioning System) the vehicles are queried successively and cyclically by a control center. By the time delay between the individual queries creates a bias error, the one of the first polled vehicle during the Corresponds to the time period of a query cycle and corresponds to approx. 0 for the last queried vehicle. It means that in the central office the impression can arise that those queried first Vehicles have greater delays than the vehicles last polled exhibit. Depending on the size of the vehicle fleet, this can be for one Query cycle time required more than half a minute.
Um dem entgegenzusteuern, ist es bekannt, die Zykluszeit durch eine schnellere Abfrage zu verkürzen. Denkbar wäre auch die gleichzeitige Abfrage aller Fahrzeuge. Beide Varianten sind jedoch bei einer sehr hohen und insbesondere bei sich vergrößernder Anzahl von Fahrzeugen nicht praktikabel. Die Schnellabfragevariante hätte eine unakzeptable Erhöhung des immer noch vorhandenen Verzerrungsfehlers zur Folge, während bei gleichzeitiger Abfrage die Anzahl der erforderlichen Abfragekanäle bei zunehmender Anzahl von Fahrzeugen nicht ohne weiteres vergrößerbar ist.To counteract this, it is known to use a cycle time shorten faster query. A simultaneous query would also be conceivable of all vehicles. However, both variants are at a very high and especially not when the number of vehicles increases practical. The quick query variant would have an unacceptable increase of the still existing distortion error, while at simultaneous query the number of required query channels with increasing Number of vehicles is not easily expandable.
Der Erfindung liegt die Aufgabe zugrunde, den Verzerrungsfehler auf einfache Weise und für eine beliebige Größe der Fahrzeugflotte, insbesondere auch für den Fall der Erweiterung der Fahrzeugflotte, zu vermeiden.The invention has for its object the distortion error on simple Way and for any size of vehicle fleet, in particular also to be avoided in the event of an expansion of the vehicle fleet.
Erfindungsgemäß wird die Aufgabe durch die kennzeichnenden Merkmale
des Anspruchs 1 gelöst. Vorteilhaft ist insbesondere, daß die zyklische Abfrage
der Positionsdaten durch die Zentrale beibehalten werden kann. Dennoch
ergibt sich durch die zyklisch sukzessive Abfrage quasi eine Momentaufnahme,
die die tatsächlichen Verhältnisse der Positionen der Fahrzeuge
zueinander wiedergibt. Abgefragt werden die gleichzeitig ermittelten und in
einen Speicher eingeschriebenen Positionsdaten. Der Fehler, der sich durch
die Zeitdauer für einen Abfragezyklus ergibt, ist für alle Fahrzeuge gleich.
Dadurch kann auf einfache Art und Weise eine Korrektur durchgeführt werden.
Beispielsweise können nach Beendigung jedes Abfragezyklus den Positionsdaten
der Fahrzeuge, die sich nicht gerade kurz vor einer Haltestelle
oder an der Haltestelle befinden, eine Wegstrecke von 200 m hinzuaddiert
werden. Diese Wegstrecke entspricht der durchschnittlichen, während des
für den Abfragezyklus benötigten Zeitraumes zurückgelegten Strecke.According to the invention, the object is characterized by the characteristic features
of
Voraussetzung für die Vergleichbarkeit der Positionsdaten aller Fahrzeuge
der Fahrzeugflotte ist die Übereinstimmung des Zeitpunktes für die Positionsdatenermittlung.
Vorteilhafte Ausführungen dazu sind in den Ansprüchen
2 bis 4 gekennzeichnet.Prerequisite for the comparability of the position data of all vehicles
of the vehicle fleet is the correspondence of the time for determining the position data.
Advantageous explanations are in the
Die Speicher sind gemäß Anspruch 5 vorzugsweise als überschreibbare Datenspeicher geringer Speicherkapazität und einfachster Bauart ausgebildet. According to claim 5, the memories are preferably rewritable Data storage of small storage capacity and simplest design.
Die Erfindung wird nachfolgend anhand eines figürlich dargestellten Ausführungsbeispiels näher erläutert.The invention is described below with reference to an exemplary embodiment shown in the figures explained in more detail.
Dargestellt ist eine Reihe von Fahrzeugen F1, F2 ... Fn, deren Anzahl n eine Fahrzeugflotte bildet, die durch eine Zentrale Z überwacht wird. Die Zentrale Z dient unter anderem dazu, Fahrplan- und Umleitungsinformationen sowie DGPS (Differential Global Positioning System) - Korrekturdaten an die Fahrzeuge zu übermitteln. Zunehmend werden die in der Zentrale Z verfügbaren Daten auch benutzt, um Haltestellen-Displays (nicht dargestellt) zur Visualisierung der verbleibenden Wartezeit bis zum Eintreffen des nächsten Fahrzeuges F1, F2 ... Fn anzusteuern. Für diese Anwendungen ist es erforderlich, exakte und zeitkonforme Positionsdaten der einzelnen Fahrzeuge F1, F2 ... Fn zu kennen. Diese Positionsdaten erfragt die Zentrale Z in einem Polling-Verfahren, das heißt die Positionsdaten des gleichen Zeitpunkt der Fahrzeuge F1, F2 ... Fn werden nacheinander an die Zentrale Z übermittelt. Damit alle Fahrzeuge F1, F2 ... Fn ihre Positionsdaten des gleichen Zeitpunktes an die Zentrale Z melden, ist jedes Fahrzeug F1, F2 ... Fn mit einem Speicher S1, S2 ... Sn ausgestattet. Das Polling-Verfahren hat Zugriff auf diese Speicher S1, S2 ... Sn. Während eines Polling-Zyklus werden somit Positionsdaten x1, y1 / x2, y2 / ... / xn, yn eines für alle Fahrzeuge F1, F2 ... Fn gleichen Zeitpunkts t1 an die Zentrale Z gemeldet. Dieser feste Zeitpunkt t1 kann zum Beispiel dadurch realisiert werden, daß die Zentrale Z unmittelbar vor Beginn des nächsten Polling-Zyklus an alle Fahrzeuge F1, F2 ... Fn ein Auslösesignal übersendet, das dazu führt, daß eine aktuelle Positionsermittlung durch die Fahrzeuge F1, F2 ... Fn aktiviert wird. Zur Positionsermittlung sind beispielsweise odometrische Verfahren, bei denen die Radachsenumdrehungen ausgewertet werden, Funkbakenverfahren oder GPS- bzw. DGPS- Verfahren (Global Positioning System Bzw. Differential Global Positioning System) gebräuchlich. Falls die Fahrzeuge F1, F2 ... Fn mit GPS- bzw. DPGS- Empfängern ausgestattet sind, kann die abgeleitete Systemzeit, die für alle GPS- bzw. DGPS- Empfänger absolut gleich ist, zur Festlegung einer turnusmäßigen Positionsermittlung in bestimmten Zeitabständen verwendet werden. Die Zeitabstände sind dabei auf die Länge des Polling-Zyklus abgestimmt und entsprechen genau dem Abstand zwischen zwei Polling-Zyklen. Um diese Synchronisation zu sparen, kann das oben beschriebene Aktivierungsverfahren mittels eines Auslösesignals, das durch die Zentrale Z generiert wird, verwendet werden. Dabei ergibt sich auch der Vorteil, daß der Abstand zwischen zwei Polling-Zyklen nicht notwendig konstant sein muß.A series of vehicles F 1 , F 2 ... F n is shown , the number n of which forms a vehicle fleet which is monitored by a control center Z. Central Z serves, among other things, to transmit schedule and rerouting information as well as DGPS (Differential Global Positioning System) correction data to the vehicles. The data available in the central office Z are also increasingly being used to control stop displays (not shown) for visualizing the remaining waiting time until the next vehicle F 1 , F 2 ... F n arrives. For these applications it is necessary to know exact and time-conforming position data of the individual vehicles F 1 , F 2 ... F n . The central station Z asks for this position data in a polling process, that is to say the position data of the same point in time of the vehicles F 1, F 2 ... F n are transmitted to the central station Z one after the other. So that all vehicles F 1 , F 2 ... F n report their position data to the central station Z at the same time, each vehicle F 1 , F 2 ... F n has a memory S 1 , S 2 ... S n fitted. The polling method has access to these memories S 1 , S 2 ... S n . During a polling cycle, position data x 1 , y 1 / x 2 , y 2 / ... / x n , y n are sent to the control center at the same time t 1 for all vehicles F 1 , F 2 ... F n Z reported. This fixed point in time t 1 can be realized, for example, in that the control center Z sends a trigger signal to all vehicles F 1 , F 2 ... F n immediately before the start of the next polling cycle, which leads to a current position determination by the vehicles F 1 , F 2 ... F n is activated. For example, odometric methods in which the wheel axis revolutions are evaluated, radio beacon methods or GPS or DGPS methods (global positioning system or differential global positioning system) are used for determining the position. If the vehicles F 1 , F 2 ... F n are equipped with GPS or DPGS receivers, the derived system time, which is absolutely the same for all GPS or DGPS receivers, can be used to determine a regular position determination Intervals are used. The time intervals are matched to the length of the polling cycle and correspond exactly to the interval between two polling cycles. In order to save this synchronization, the activation method described above can be used by means of a trigger signal that is generated by the control center Z. This also has the advantage that the distance between two polling cycles does not necessarily have to be constant.
Wenn die Positionsdatenermittlung zum Zeitpunkt t1 erfolgt und ein Polling-Zyklus die Länge Δt hat, läßt sich auf einfache Weise ein aktuelles Bild interpolieren, indem für alle Fahrzeuge F1, F2 ... Fn, die voraussichtlich ungehinderte freie Fahrt vor sich haben, die in der Zeitdifferenz Δt durchschnittlich zurückgelegte Wegstrecke zu den Positionsdaten addiert wird. Bei Δt = const. ergibt sich ein fester Additionswert. Zur weiteren Verbesserung der Genauigkeit können verkehrsbedingte oder strecken bedingte Besonderheiten, beispielsweise Verkehrsstockungen oder Haltestellenbereich, berücksichtigt werden.If the position data is determined at time t 1 and a polling cycle has the length .DELTA.t, a current image can be interpolated in a simple manner, for all vehicles F 1 , F 2 ... F n , the probably unimpeded free travel ahead have, the average distance covered in the time difference Δt is added to the position data. At Δt = const. there is a fixed addition value. To further improve the accuracy, traffic-related or route-related peculiarities, for example traffic congestion or stop area, can be taken into account.
Die Erfindung beschränkt sich nicht auf das vorstehend angegebene Ausführungsbeispiel. Vielmehr ist eine Anzahl von Varianten denkbar, welche auch bei grundsätzlich anders gearteter Ausführung von den Merkmalen der Erfindung Gebrauch machen.The invention is not limited to the exemplary embodiment specified above. Rather, a number of variants are conceivable, which even if the features are fundamentally different make use of the invention.
Claims (5)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19753741A DE19753741A1 (en) | 1997-12-04 | 1997-12-04 | Procedure for the transmission of position data |
| DE19753741 | 1997-12-04 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0921511A2 true EP0921511A2 (en) | 1999-06-09 |
| EP0921511A3 EP0921511A3 (en) | 2000-07-05 |
| EP0921511B1 EP0921511B1 (en) | 2004-01-02 |
Family
ID=7850682
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP98440269A Expired - Lifetime EP0921511B1 (en) | 1997-12-04 | 1998-11-20 | Method for transmitting position data |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0921511B1 (en) |
| AT (1) | ATE257266T1 (en) |
| DE (2) | DE19753741A1 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001046934A1 (en) * | 1999-12-21 | 2001-06-28 | Zakrytoe Aktsionernoe Obschestvo 'east Line-Handling' | Real-time tracking and management of land-based vehicles on airports |
| WO2003075588A1 (en) | 2002-03-01 | 2003-09-12 | Multicom Security Ab | Method, system, radio device, computer program and sim-card for alarm path monitoring |
| US7266376B2 (en) | 2000-11-13 | 2007-09-04 | Sharp Kabushiki Kaisha | Method and device for providing information related to activity of user |
| CN102129078A (en) * | 2010-01-20 | 2011-07-20 | 厦门雅迅网络股份有限公司 | Method for uploading positioning data of vehicles |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1813128A1 (en) * | 1968-12-06 | 1970-06-25 | Chisholm John Peter | System for determining and displaying the respective location of vehicles |
| US3644883A (en) * | 1969-12-29 | 1972-02-22 | Motorola Inc | Automatic vehicle monitoring identification location alarm and voice communications system |
| US3697941A (en) * | 1971-07-01 | 1972-10-10 | Devenco Inc | Vehicle location system and method |
| DE3932029A1 (en) * | 1988-12-15 | 1990-06-28 | Sven Dipl Ing Haase | Position recognition device for vehicles in monitor zone - has separate position transmitters received and reradiated by vehicle along with marker |
| US6144916A (en) * | 1992-05-15 | 2000-11-07 | Micron Communications, Inc. | Itinerary monitoring system for storing a plurality of itinerary data points |
| GB2299695B (en) * | 1995-04-07 | 1998-12-02 | Centrepoint Technology Limited | Vehicle security systems |
| US5691980A (en) * | 1995-06-07 | 1997-11-25 | General Electric Company | Local communication network for power reduction and enhanced reliability in a multiple node tracking system |
-
1997
- 1997-12-04 DE DE19753741A patent/DE19753741A1/en not_active Withdrawn
-
1998
- 1998-11-20 EP EP98440269A patent/EP0921511B1/en not_active Expired - Lifetime
- 1998-11-20 DE DE59810527T patent/DE59810527D1/en not_active Expired - Lifetime
- 1998-11-20 AT AT98440269T patent/ATE257266T1/en not_active IP Right Cessation
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001046934A1 (en) * | 1999-12-21 | 2001-06-28 | Zakrytoe Aktsionernoe Obschestvo 'east Line-Handling' | Real-time tracking and management of land-based vehicles on airports |
| SG96582A1 (en) * | 1999-12-21 | 2003-06-16 | Zakrytoye Aktsionernoye Obsche | The technique of real-time tracking and management of land-based vehicles of the airport |
| US7266376B2 (en) | 2000-11-13 | 2007-09-04 | Sharp Kabushiki Kaisha | Method and device for providing information related to activity of user |
| WO2003075588A1 (en) | 2002-03-01 | 2003-09-12 | Multicom Security Ab | Method, system, radio device, computer program and sim-card for alarm path monitoring |
| CN102129078A (en) * | 2010-01-20 | 2011-07-20 | 厦门雅迅网络股份有限公司 | Method for uploading positioning data of vehicles |
| CN102129078B (en) * | 2010-01-20 | 2013-05-22 | 厦门雅迅网络股份有限公司 | Method for uploading positioning data of vehicles |
Also Published As
| Publication number | Publication date |
|---|---|
| DE59810527D1 (en) | 2004-02-05 |
| EP0921511B1 (en) | 2004-01-02 |
| EP0921511A3 (en) | 2000-07-05 |
| DE19753741A1 (en) | 1999-06-10 |
| ATE257266T1 (en) | 2004-01-15 |
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