EP0889455A1 - Public transport information system advising the users of the estimated waiting times at the stops within the network - Google Patents
Public transport information system advising the users of the estimated waiting times at the stops within the network Download PDFInfo
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- EP0889455A1 EP0889455A1 EP98401637A EP98401637A EP0889455A1 EP 0889455 A1 EP0889455 A1 EP 0889455A1 EP 98401637 A EP98401637 A EP 98401637A EP 98401637 A EP98401637 A EP 98401637A EP 0889455 A1 EP0889455 A1 EP 0889455A1
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- 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
Definitions
- the present invention relates to systems of information to inform users of public transportation relative to wait times at shutdowns of these networks.
- WO-A-94/02923 describes an example of a such information system.
- information systems have data that accurately represent positions of transit vehicles at the time where these devices receive this data, which allows information devices to calculate an estimate very precise waiting times at network stops of public transport, and this by transmitting to the devices minimum data volume.
- Figure 1 schematically shows a line 1 of buses belonging to an urban network, traveled by buses 2 which are represented here by arrows oriented in the direction of their progression.
- Line 1 is broken down into two routes (i.e. two directions) A and B in opposite directions, which include each different stops 3.
- the position actual of each bus 2 is determined at intervals of regular time by a localization system 4, which receives position data for each bus 2 by any known means, and preferably by over the air.
- the position data in question can be sent for example by the buses themselves from an on-board positioning device, in particular GPS type, or others.
- the positioning system 4 sends all positions xi (ti) as well as the instants ti corresponding to a central computer station 5.
- the central computer station 5 From data received from the location system 4, the central computer station 5 generates at intervals of regular time, for example between 20 and 40 seconds, messages including identification of each bus 2, which we will denote by its index i, as well as a position xi of this bus.
- the messages in question are sent by post data center 5, at instants ⁇ known as instants transmission, to at least one paging transmitter 6 unilateral which works for example according to the ERMES standard or other.
- This transmitter 6 transmits said messages towards electronic information devices 10 which advantageously consist at least in part of portable unilateral paging receivers specially programmed.
- These messages are received by the receivers 10 after a certain mean routing time T, which may be worth for example 10 to 20 seconds.
- the positions xi of the different buses which are transmitted by the central computer station 5 to receivers 10, are positions estimated at time ⁇ + T, so that said positions substantially match the positions actually occupied by buses 2 at the time when said positions are received by receivers 10.
- a receiver 10 each time that a receiver 10 receives a radio message giving the positions xi of the different network bus, it not only memorizes its positions xi, but also the instant t of arrival of this message, and he then considers that said positions xi are those existing at time t, to calculate waiting times buses.
- the receivers 10 can thus perform calculations very precise waiting times, without we have to transmit to these receivers all of the instants ti corresponding to the positions xi determined by the location system 4: this avoids increasing data transmission time to receivers 10, and at the same time unnecessarily cluttering the network of unilateral paging.
- the central computer station 5 uses the positions xi (ti) as well as the instants ti of measuring these positions, which he previously memorized on several localization cycles.
- a bus 2 when a bus 2 is located at a distance from a stop 3 which is less than a value limit D, D being for example between 10 and 50 meters, then the central computer station 5 considers that this bus is exactly at stop 3 in question.
- D a value limit
- This comparison can be made for example by extrapolating positions xi '( ⁇ + T) from new real positions xi (ti) received from the system location 4 (this extrapolation can be done by example according to a proportional rule if the new instant of localization ti is posterior to the instant ⁇ + T corresponding to the previously transmitted positions), and by comparing these extrapolated positions xi '( ⁇ + T) with the positions xi ( ⁇ + T) previously transmitted.
- We then adjust estimation parameters based on this comparison in particular, we can adjust this way Ta downtime from buses to network stops as well than the aforementioned correction coefficient ⁇ .
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Abstract
Description
La présente invention est relative aux systèmes d'information pour renseigner les usagers de réseaux de transport en commun relativement aux temps d'attente aux arrêts de ces réseaux.The present invention relates to systems of information to inform users of public transportation relative to wait times at shutdowns of these networks.
Plus particulièrement, l'invention concerne un système d'information pour renseigner les usagers d'un réseau de transport en commun sur les temps d'attente des véhicules de transport en commun à des arrêts appartenant à ce réseau, ce système d'information comportant :
- des dispositifs électroniques d'information dotés chacun d'une interface permettant de renseigner les usagers sur les temps d'attente des véhicules de transport en commun, chacun de ces dispositifs d'information étant adapté pour déterminer les temps d'attente des véhicules de transport en commun à partir de positions successives desdits véhicules de transport en commun,
- un poste central informatique, adapté pour transmettre de façon répétitive vers les dispositifs d'information, les nouvelles positions des véhicules de transport en commun, cette transmission débutant à des instants successifs dits instants de transmission, et lesdites positions parvenant aux dispositifs d'information au bout d'un certain temps moyen d'acheminement T après chaque instant de transmission ,
- et un système de localisation adapté pour localiser les véhicules de transport en commun et pour communiquer au poste central informatique des données représentatives de la position xi(ti) de chaque véhicule de transport en commun ainsi que l'instant ti auquel a été faite la localisation de ce véhicule.
- electronic information devices each provided with an interface making it possible to inform users of the waiting times of public transport vehicles, each of these information devices being adapted to determine the waiting times of transport vehicles in common from successive positions of said public transport vehicles,
- a central computer station, adapted to transmit repeatedly to the information devices, the new positions of the public transport vehicles, this transmission starting at successive instants its so-called transmission instants, and said positions reaching the information devices after a certain average routing time T after each instant of transmission ,
- and a location system adapted to locate the public transport vehicles and to communicate to the central computer station data representative of the position xi (ti) of each public transport vehicle as well as the instant ti at which the localization was made of this vehicle.
Le document WO-A-94/02923 décrit un exemple d'un tel système d'information.WO-A-94/02923 describes an example of a such information system.
Le système d'information décrit dans ce document donne satisfaction, mais il apparaít souhaitable d'affiner les estimations des temps d'attente réalisées dans les dispositifs électroniques d'information de ce système.The information system described in this document gives satisfaction, but it seems desirable to refine wait time estimates made in electronic information devices of this system.
C'est précisément le but poursuivi par la présente invention.This is precisely the aim pursued by this invention.
A cet effet, selon l'invention, un système d'information du genre en question est essentiellement caractérisé en ce que le poste central informatique est adapté pour :
- avant chaque instant de transmission , estimer la position xi (+T) que devrait avoir chaque véhicule de transport en commun à l'instant +T, en fonction des positions antérieures des véhicules de transport en commun,
- puis, à l'instant de transmission , transmettre ces estimations xi(+T) vers les dispositifs d'information en tant que nouvelles positions des véhicules de transport en commun.
- before each transmission instant , estimate the position xi ( + T) that each public transport vehicle should have at the instant + T, according to the previous positions of the public transport vehicles,
- then, at the time of transmission , transmit these estimates xi ( + T) to the information devices as new positions of the public transport vehicles.
Grâce à ces dispositions, les dispositifs d'information disposent de données qui représentent fidèlement les positions des véhicules de transport en commun au moment où ces dispositifs reçoivent ces données, ce qui permet aux dispositifs d'information de calculer une estimation très précise des temps d'attente aux arrêts du réseau de transport en commun, et ce en transmettant aux dispositifs d'information un volume de données minimal. Thanks to these provisions, information systems have data that accurately represent positions of transit vehicles at the time where these devices receive this data, which allows information devices to calculate an estimate very precise waiting times at network stops of public transport, and this by transmitting to the devices minimum data volume.
En particulier, il n'est pas nécessaire de transmettre aux dispositifs d'information les instants de localisation ti des différents véhicules de transport en commun.In particular, it is not necessary to transmit to the information devices the instants of localization ti of different public transport vehicles.
On réalise ainsi un gain au niveau du temps de transmission des données vers les dispositifs d'information, et au niveau de l'encombrement du réseau de transmission.There is thus a gain in terms of the time of transmission of data to information devices, and at the level of the congestion of the transmission network.
Dans des modes de réalisation préférés de l'invention, on peut éventuellement avoir recours en outre à l'une et/ou à l'autre des dispositions suivantes :
- au moins certains des dispositifs d'information sont des boítiers récepteurs portatifs de radio-messagerie unilatérale, les positions des véhicules de transport en commun étant transmises à ces dispositifs d'information par voie hertzienne ;
- les véhicules de transport en commun sont des autobus ;
- le poste central informatique est adapté pour estimer la position que devrait avoir chaque véhicule de transport en commun à l'instant +T en calculant une distance Li normalement parcourue par ce véhicule entre les instants ti et +T, au moyen de la formule : Li=Vi.(+T-ti),
- le poste central informatique est adapté pour calculer la vitesse estimée Vi de chaque véhicule de transport en commun comme étant une vitesse moyenne passée de ce véhicule de transport en commun, lorsque la dernière position connue dudit véhicule de transport en commun ne se trouve pas sur un arrêt du réseau de transport en commun;
- le poste central informatique est adapté pour calculer la vitesse estimée Vi de chaque véhicule de transport en commun comme étant une vitesse moyenne passée de ce véhicule de transport en commun, lorsque la position dudit véhicule de transport en commun, relevée par le système de localisation, se trouve sur un même arrêt depuis un temps supérieur à une première durée prédéterminée ;
- le poste central informatique est adapté pour calculer la vitesse estimée Vi de chaque véhicule de transport en commun comme étant égale à 0 pendant une deuxième durée prédéterminée lorsque la dernière position connue de ce véhicule de transport en commun se trouve pour la première fois sur un arrêt du réseau de transport en commun, puis Vi étant une vitesse moyenne passée du véhicule de transport en commun considéré, après cette deuxième durée prédéterminée ;
- ladite vitesse moyenne passée est calculée sur une période ayant une durée inférieure à 1 mn ;
- ladite vitesse moyenne passée est une vitesse moyenne calculée sur une période ayant une durée supérieure à 5 mn, multipliée par un coefficient correcteur compris entre 1,1 et 1,5 ;
- ladite vitesse moyenne passée est la dernière vitesse non nulle du véhicule de transport en commun, calculée entre deux localisations successives de ce véhicule ;
- le poste central informatique est adapté pour corriger la dernière position xi(ti) de chaque véhicule de transport en commun en considérant que ce véhicule de transport en commun est à un arrêt du réseau de transport en commun si ladite dernière position est à une distance dudit arrêt qui est inférieure à une certaine valeur limite, cette valeur limite étant comprise entre 10 et 50 m;
- l'estimation de la position des véhicules de transport en commun à l'instant +T est réalisée par le poste central informatique en fonction d'au moins un paramètre autre que les données reçues du système de localisation, le poste central informatique étant adapté pour comparer les positions ainsi estimées avec les positions réelles ultérieures des véhicules de transport en commun, et pour ajuster ledit paramètre en fonction de cette comparaison ;
- le poste central informatique est adapté pour :
- recevoir des données d'au moins un des dispositifs d'information,
- déterminer ainsi, après chaque instant d'émission , l'instant réel auquel ce dispositif d'information a reçu les positions transmises audit instant d'émission,
- et ajuster la valeur du temps moyen d'acheminement T en fonction de cet instant réel de réception.
- at least some of the information devices are portable receiver boxes for unilateral paging, the positions of the public transport vehicles being transmitted to these information devices over the air;
- public transit vehicles are buses;
- the central computer station is adapted to estimate the position that each public transport vehicle should have at the instant + T by calculating a distance Li normally traveled by this vehicle between the instants ti and + T, by means of the formula : Li = Vi. ( + T-ti),
- the central computer station is adapted to calculate the estimated speed Vi of each public transport vehicle as being an average past speed of this public transport vehicle, when the last known position of said public transport vehicle is not on a shutdown of the public transportation network;
- the central computer station is adapted to calculate the estimated speed Vi of each public transport vehicle as being an average past speed of this public transport vehicle, when the position of said public transport vehicle, noted by the location system, has been on the same stop for a time greater than a first predetermined duration;
- the central computer station is adapted to calculate the estimated speed Vi of each public transport vehicle as being equal to 0 for a second predetermined duration when the last known position of this public transport vehicle is for the first time on a stop of the public transport network, then Vi being an average past speed of the public transport vehicle considered, after this second predetermined duration;
- said past average speed is calculated over a period of less than 1 minute;
- said past average speed is an average speed calculated over a period of time greater than 5 minutes, multiplied by a correction coefficient between 1.1 and 1.5;
- said past average speed is the last non-zero speed of the public transport vehicle, calculated between two successive locations of this vehicle;
- the central computer station is adapted to correct the last position xi (ti) of each public transport vehicle by considering that this public transport vehicle is at a stop of the public transport network if said last position is at a distance from said stop which is less than a certain limit value, this limit value being between 10 and 50 m;
- the estimation of the position of the public transport vehicles at the instant + T is carried out by the central computer station as a function of at least one parameter other than the data received from the location system, the central computer station being adapted to compare the positions thus estimated with the subsequent actual positions of the public transport vehicles, and to adjust said parameter as a function of this comparison;
- the central computer station is suitable for:
- receive data from at least one of the information devices,
- thus determine, after each transmission instant , the real instant at which this information device has received the positions transmitted at said transmission instant,
- and adjust the value of the average routing time T as a function of this real instant of reception.
D'autres caractéristiques et avantages de l'invention apparaítront au cours de la description suivante d'une de ses formes de réalisation, donnée à titre d'exemple non limitatif, en regard des dessins joints.Other characteristics and advantages of the invention will appear during the following description of one of its embodiments, given by way of example not limiting, with reference to the accompanying drawings.
Sur les dessins :
- la figure 1 est une vue schématique d'une ligne d'un réseau d'autobus,
- la figure 2 est une vue schématique d'un système d'information selon une forme de réalisation de l'invention, permettant de renseigner les usagers du réseau d'autobus, relativement aux temps d'attente aux arrêts de ce réseau,
- et la figure 3 est un schéma de principe d'un boítier portatif d'information appartenant au système d'information représenté sur la figure 2.
- FIG. 1 is a schematic view of a line of a bus network,
- FIG. 2 is a schematic view of an information system according to an embodiment of the invention, making it possible to inform the users of the bus network, relative to the waiting times at the stops of this network,
- and FIG. 3 is a block diagram of a portable information box belonging to the information system shown in FIG. 2.
Sur les différentes figures, les mêmes références désignent des éléments identiques ou similaires.In the different figures, the same references denote identical or similar elements.
La figure 1 montre schématiquement une ligne 1
d'autobus appartenant à un réseau urbain, parcourue par
des autobus 2 qui sont représentés ici par des flèches
orientées dans le sens de leur progression.Figure 1 schematically shows a line 1
of buses belonging to an urban network, traveled by
La ligne 1 se décompose en deux parcours (c'est-à-dire
deux directions) A et B de sens opposé, qui comprennent
chacun différents arrêts 3.Line 1 is broken down into two routes (i.e.
two directions) A and B in opposite directions, which include
each
Comme expliqué plus en détail dans le document WO-A-94/02923,
et comme représenté sur la figure 2, la position
réelle de chaque autobus 2 est déterminée à intervalles
de temps régulier par un système de localisation 4,
qui reçoit des données de position relatives à chaque autobus
2 par tout moyen connu, et de préférence par voie
hertzienne.As explained in more detail in document WO-A-94/02923,
and as shown in figure 2, the position
actual of each
Les données de position en question peuvent être envoyées par exemple par les autobus eux-mêmes à partir d'un dispositif de positionnement embarqué, notamment de type GPS, ou autres.The position data in question can be sent for example by the buses themselves from an on-board positioning device, in particular GPS type, or others.
Le système de positionnement 4 mémorise ainsi, pour chaque autobus 2 du réseau (représenté par un indice i) :
- des données correspondant à la position xi (ti) de cet autobus sur le parcours A, B qu'il est en train de suivre,
- et l'instant ti auquel a été déterminée cette position.
- data corresponding to the position xi (ti) of this bus on the route A, B which it is currently following,
- and the instant ti at which this position was determined.
A intervalles de temps réguliers, par exemple toutes
les 20 à 30 secondes, le système de positionnement 4
envoie l'ensemble des positions xi(ti) ainsi que les instants
ti correspondants à un poste central informatique 5.At regular time intervals, for example all
every 20 to 30 seconds, the
A partir des données reçues du système de localisation
4, le poste central informatique 5 génère à intervalles
de temps régulier, compris par exemple entre 20 et
40 secondes, des messages comprenant l'identification de
chaque autobus 2, que nous désignerons par son indice i,
ainsi qu'une position xi de cet autobus.From data received from the
La position xi en question pourra par exemple comprendre, pour chaque autobus 2 du réseau :
- l'indication de la ligne et du parcours A ou B suivi par cet autobus,
- l'indication de la prochaine
station 3 qui va être atteinte par cet autobus, ou à laquelle se trouve déjà cet autobus, - et la distance d séparant cet autobus de ladite prochaine station.
- indication of the line and route A or B followed by this bus,
- the indication of the
next station 3 which will be reached by this bus, or to which this bus is already located, - and the distance d separating this bus from said next station.
Les messages en question sont émis par le poste
central informatique 5, à des instants dits instants
d'émission, vers au moins un émetteur 6 de radio-messagerie
unilatérale qui fonctionne par exemple selon la
norme ERMES ou autre. Cet émetteur 6 transmet lesdits messages
vers des dispositifs d'information électroniques 10
qui consistent avantageusement au moins pour partie en des
récepteurs portatifs de radio-messagerie unilatérale spécialement
programmés. The messages in question are sent by
Ces messages sont reçus par les récepteurs 10
après un certain temps moyen d'acheminement T, qui peut
valoir par exemple 10 à 20 secondes.These messages are received by the
Comme représenté sur la figure 3, chaque récepteur 10 peut comprendre classiquement :
- une antenne 11 associée à un dispositif de réception 12 de messages radio,
un circuit 13 de décodage de ces messages,- une mémoire 14,
un microprocesseur 15,un écran 16 ou autre dispositif d'affichage,un clavier 17 à touches ou autre dispositif d'interrogation,une pile 18 ou autre alimentation électrique autonome,- et un haut-
parleur 19 ou autre émetteur de signaux sonores.
- an antenna 11 associated with a
device 12 for receiving radio messages, - a
circuit 13 for decoding these messages, - a
memory 14, - a
microprocessor 15, - a
screen 16 or other display device, - a
keyboard 17 with keys or other interrogation device, - a
battery 18 or other autonomous power supply, - and a
speaker 19 or other transmitter of sound signals.
Comme expliqué dans le document WO-A-94/02923, le microprocesseur 15 de chaque récepteur 10 est programmé pour :
- élaborer, à partir des messages radio reçus du
poste
central informatique 5, des informations relatives au temps d'attente du ou des prochains autobus 2 àun arrêt donné 3 sur un parcours donné du réseau d'autobus, - et faire apparaítre ces informations sur l'écran 16, en fonction des interrogations effectuées par l'usager.
- develop, from radio messages received from the
central computer station 5, information relating to the waiting time of the next bus orbuses 2 at a givenstop 3 on a given route of the bus network, - and show this information on the
screen 16, according to the interrogations carried out by the user.
Afin que les temps d'attente ainsi élaborés soient
les plus exacts possibles, les positions xi des différents
autobus, qui sont transmises par le poste central informatique
5 à destination des récepteurs 10, sont des positions
estimées à l'instant +T, de façon que lesdites positions
correspondent sensiblement aux positions réellement
occupées par les autobus 2 au moment où lesdites positions
sont reçues par les récepteurs 10.So that the waiting times thus developed are
as exact as possible, the positions xi of the different
buses, which are transmitted by the
De la sorte, chaque fois qu'un récepteur 10 reçoit
un message radio donnant les positions xi des différents
autobus du réseau, il mémorise non seulement ses positions
xi, mais également l'instant t d'arrivée de ce message, et
il considère ensuite que lesdites positions xi sont celles
existantes à l'instant t, pour calculer les temps d'attente
des autobus.In this way, each time that a
Les récepteurs 10 peuvent ainsi effectuer des calculs
très précis des temps d'attente, sans pour autant que
l'on ait à transmettre à ces récepteurs l'ensemble des
instants ti correspondant aux positions xi déterminées par
le système de localisation 4 : on évite ainsi d'augmenter
le temps de transmission des données vers les récepteurs
10, et par la même occasion d'encombrer inutilement le réseau
de radio-messagerie unilatérale.The
Pour estimer la position de chaque autobus à
l'instant +T, le poste central informatique 5 utilise les
positions xi(ti) ainsi que les instants ti de mesure de
ces positions, qu'il a précédemment mémorisés sur plusieurs
cycles de localisation.To estimate the position of each bus at
the instant + T, the
Plus précisément, ces données précédemment mémorisées
permettent au poste central informatique 5 de calculer
une vitesse estimée Vi pour chaque autobus, ce qui
permet d'estimer la position de l'autobus à l'instant +T
en considérant que cet autobus aura parcouru entre les
instants ti et +T, une distance Li = Vi. (+T-ti). More specifically, these previously stored data
allow the
La vitesse estimée Vi de chaque autobus peut être calculée de diverses manières, et notamment de la façon suivante :
- lorsqu'un autobus se trouve entre deux arrêts 3 du réseau ou lorsqu'il se trouve sur un même arrêt depuis un temps supérieur à une durée prédéterminée (par exemple depuis plus d'un cycle de localisation, c'est-à-dire que les deux dernières positions mesurées de cet autobus se trouvent sur le même arrêt), la vitesse Vi peut être égale à une vitesse moyenne passée de l'autobus, déterminée à partir des positions xi(ti) et des instants ti de mesures de ces positions, précédemment mémorisés par le poste central informatique sur plusieurs cycles de localisation,
- et lorsque la dernière position connue de l'autobus
se trouve pour la première fois sur
un arrêt 3 du réseau, la vitesse estimée Vi est d'abord égale à 0 pendant une durée prédéterminée Ta,par exemple pendant 15 secondes, puis Vi prend à nouveau une valeur non nulle au-delà deces 15 secondes, cette valeur non nulle étant comme précédemment une vitesse moyenne passée de l'autobus.
- when a bus has been between two
stops 3 of the network or when it has been on the same stop for a time longer than a predetermined duration (for example for more than one location cycle, that is to say that the last two measured positions of this bus are on the same stop), the speed Vi can be equal to an average past speed of the bus, determined from the positions xi (ti) and the instants ti of measurements of these positions , previously stored by the central computer station over several location cycles, - and when the last known position of the bus is for the first time on a
stop 3 of the network, the estimated speed Vi is first equal to 0 for a predetermined duration Ta, for example for 15 seconds, then Vi takes to again a non-zero value beyond these 15 seconds, this non-zero value being, as before, an average past speed of the bus.
Avantageusement, lorsqu'un autobus 2 est localisé
à une distance d'un arrêt 3 qui est inférieure à une valeur
limite D, D étant par exemple comprise entre 10 et 50
mètres, alors le poste central informatique 5 considère
que cet autobus se trouve exactement sur l'arrêt 3 en
question.Advantageously, when a
A titre d'exemple non limitatif, on peut utiliser comme vitesse moyenne passée de chaque autobus :
- une vitesse moyenne calculée sur une période ayant une durée inférieure à 1 mn, par exemple environ 30 secondes, cette période étant de préférence immédiatement antérieure à l'instant présent,
- une vitesse moyenne calculée sur une période
ayant une durée supérieure à 5 mn, de préférence multipliée
par un coefficient correcteur λ compris par exemple
entre 1,1
et 1,5 pour tenir compte des arrêts de l'autobus pendant cette période, - ou encore la dernière vitesse non nulle de l'autobus, calculée entre deux localisations successives de cet autobus.
- an average speed calculated over a period having a duration of less than 1 min, for example around 30 seconds, this period preferably being immediately prior to the present moment,
- an average speed calculated over a period of more than 5 minutes, preferably multiplied by a correction coefficient λ of, for example, between 1.1 and 1.5 to take into account bus stops during this period,
- or the last non-zero speed of the bus, calculated between two successive locations of this bus.
Afin d'affiner encore les estimations de position
effectuées par le poste central informatique 5, on peut
avantageusement comparer les positions estimées par ce
poste central informatique avec les positions réelles ultérieures
des autobus. Cette comparaison peut être faite
par exemple en extrapolant des positions xi' (+T) à partir
des nouvelles positions réelles xi(ti) reçues du système
de localisation 4 (cette extrapolation peut se faire par
exemple selon une règle proportionnelle si le nouvel instant
de localisation ti est postérieur à l'instant +T
correspondant aux positions précédemment transmises), et
en comparant ces positions extrapolées xi' (+T) avec les
positions xi(+T) précédemment transmises. On ajuste alors
les paramètres de l'estimation en fonction de cette comparaison
: en particulier, on peut ajuster de cette façon
les temps d'arrêt Ta des autobus aux arrêts du réseau ainsi
que le coefficient correcteur λ susmentionné.To further refine the position estimates
performed by the
Pour améliorer encore la précision des estimations
effectuées par le poste central informatique, il est possible
de coupler un récepteur 10 de radio-messagerie à ce
poste central, afin de pouvoir mesurer le temps d'acheminement
réel des messages entre le poste central informatique
et les récepteurs 10 de radio-messagerie. On peut ainsi
ajuster la valeur du temps moyen d'acheminement T en
fonction de ce temps d'acheminement réel.To further improve the accuracy of the estimates
performed by the central computer station, it is possible
to pair a
Claims (13)
où Vi est une vitesse estimée du véhicule de transport en commun, le poste central informatique (5) étant adapté pour calculer les vitesses estimées Vi en fonction des positions antérieures des véhicules de transport en commun.Information system according to any one of the preceding claims, in which the central computer station (5) is adapted to estimate the position which each public transport vehicle should have at the instant + T by calculating a distance Li normally traveled by this vehicle between the instants ti and + T, by means of the formula: Li = Vi. ( + T-ti),
where Vi is an estimated speed of the public transport vehicle, the central computer station (5) being adapted to calculate the estimated speeds Vi as a function of the previous positions of the public transport vehicles.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9708506A FR2765710B1 (en) | 1997-07-04 | 1997-07-04 | INFORMATION SYSTEM FOR PROVIDING INFORMATION TO USERS OF A PUBLIC TRANSIT NETWORK RELATING TO WAIT TIMES AT STATIONS OF THIS NETWORK |
FR9708506 | 1997-07-04 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0889455A1 true EP0889455A1 (en) | 1999-01-07 |
EP0889455B1 EP0889455B1 (en) | 2003-01-15 |
Family
ID=9508876
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98401637A Expired - Lifetime EP0889455B1 (en) | 1997-07-04 | 1998-07-01 | Public transport information system advising the users of the estimated waiting times at the stops within the network |
Country Status (8)
Country | Link |
---|---|
US (1) | US6253148B1 (en) |
EP (1) | EP0889455B1 (en) |
AT (1) | ATE231269T1 (en) |
CA (1) | CA2242020A1 (en) |
DE (1) | DE69810706T2 (en) |
DK (1) | DK0889455T3 (en) |
ES (1) | ES2191267T3 (en) |
FR (1) | FR2765710B1 (en) |
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NL1012102C2 (en) * | 1999-05-19 | 2000-11-21 | Swilion B V | long distance public transport system uses road train onto which users' cars are loaded at start of journey and unloaded at destination |
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US7876239B2 (en) | 2003-05-28 | 2011-01-25 | Horstemeyer Scott A | Secure notification messaging systems and methods using authentication indicia |
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US6915209B1 (en) | 2003-05-19 | 2005-07-05 | David I. Spann | Visual and audible bus routing system |
JP2005056002A (en) * | 2003-08-07 | 2005-03-03 | Aisin Aw Co Ltd | Information processing center, information processing method and information providing system |
US20070217391A1 (en) * | 2006-03-16 | 2007-09-20 | Tekelec | Methods, systems, and computer program products for setting congestion levels for a plurality of routes to a common destination |
ES2436105T3 (en) | 2007-11-15 | 2013-12-27 | Vodafone Holding Gmbh | Procedure to provide transport schedule information, mobile terminal and central processing unit |
ES2363020B1 (en) * | 2008-08-07 | 2012-05-25 | Bkb Electronica, S.A. | SYSTEM FOR VISUALIZATION OF INFORMATION GENERATED BY A FLEET CONTROL SERVICE IN A NETWORK OF INFORMATIVE POSTS. |
US20120296885A1 (en) * | 2010-09-09 | 2012-11-22 | Google Inc. | Transportation Information Systems and Methods |
DE102011050954A1 (en) | 2011-06-09 | 2012-12-13 | Vladimir A. Maklashov | Information device used for delivering current situation of e.g. bus stop to e.g. passenger of e.g. bus, has transmitter that requests data on current situation of public vehicle |
US9552560B1 (en) * | 2013-12-31 | 2017-01-24 | Google Inc. | Facilitating communication between event attendees based on event starting time |
CN106355929A (en) * | 2016-09-12 | 2017-01-25 | 北海和思科技有限公司 | Intelligent public transportation system |
US10049572B2 (en) | 2016-11-11 | 2018-08-14 | Microsoft Technology Licensing, Llc | Mass transit-based people traffic sensing and control |
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US10762462B1 (en) * | 2018-08-07 | 2020-09-01 | Amazon Technologies, Inc. | Sensor-based customer arrival detection |
US10921147B1 (en) | 2018-08-29 | 2021-02-16 | Amazon Technologies, Inc. | Customer and merchant location-based ETA determination |
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- 1998-07-01 EP EP98401637A patent/EP0889455B1/en not_active Expired - Lifetime
- 1998-07-01 US US09/114,236 patent/US6253148B1/en not_active Expired - Fee Related
- 1998-07-01 DK DK98401637T patent/DK0889455T3/en active
- 1998-07-01 ES ES98401637T patent/ES2191267T3/en not_active Expired - Lifetime
- 1998-07-01 DE DE69810706T patent/DE69810706T2/en not_active Expired - Fee Related
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NL1012102C2 (en) * | 1999-05-19 | 2000-11-21 | Swilion B V | long distance public transport system uses road train onto which users' cars are loaded at start of journey and unloaded at destination |
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US8711010B2 (en) | 2003-05-28 | 2014-04-29 | Eclipse Ip, Llc | Notification systems and methods that consider traffic flow predicament data |
US9013334B2 (en) | 2003-05-28 | 2015-04-21 | Eclipse, LLC | Notification systems and methods that permit change of quantity for delivery and/or pickup of goods and/or services |
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Also Published As
Publication number | Publication date |
---|---|
DK0889455T3 (en) | 2003-05-05 |
ATE231269T1 (en) | 2003-02-15 |
ES2191267T3 (en) | 2003-09-01 |
FR2765710A1 (en) | 1999-01-08 |
EP0889455B1 (en) | 2003-01-15 |
CA2242020A1 (en) | 1999-01-04 |
DE69810706D1 (en) | 2003-02-20 |
US6253148B1 (en) | 2001-06-26 |
FR2765710B1 (en) | 1999-09-10 |
DE69810706T2 (en) | 2003-12-18 |
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