FR2732471A1 - Method for measuring space separating two cars driving on same lane - Google Patents
Method for measuring space separating two cars driving on same lane Download PDFInfo
- Publication number
- FR2732471A1 FR2732471A1 FR9503881A FR9503881A FR2732471A1 FR 2732471 A1 FR2732471 A1 FR 2732471A1 FR 9503881 A FR9503881 A FR 9503881A FR 9503881 A FR9503881 A FR 9503881A FR 2732471 A1 FR2732471 A1 FR 2732471A1
- Authority
- FR
- France
- Prior art keywords
- vehicle
- vehicles
- speed
- radar
- carrier vehicle
- 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
Classifications
-
- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/01—Detecting movement of traffic to be counted or controlled
- G08G1/052—Detecting movement of traffic to be counted or controlled with provision for determining speed or overspeed
- G08G1/054—Detecting movement of traffic to be counted or controlled with provision for determining speed or overspeed photographing overspeeding vehicles
-
- 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
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/88—Radar or analogous systems specially adapted for specific applications
- G01S13/91—Radar or analogous systems specially adapted for specific applications for traffic control
-
- 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
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/88—Radar or analogous systems specially adapted for specific applications
- G01S13/93—Radar or analogous systems specially adapted for specific applications for anti-collision purposes
- G01S13/931—Radar or analogous systems specially adapted for specific applications for anti-collision purposes of land vehicles
-
- 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
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/88—Radar or analogous systems specially adapted for specific applications
- G01S13/91—Radar or analogous systems specially adapted for specific applications for traffic control
- G01S13/92—Radar or analogous systems specially adapted for specific applications for traffic control for velocity measurement
-
- 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
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/88—Radar or analogous systems specially adapted for specific applications
- G01S13/93—Radar or analogous systems specially adapted for specific applications for anti-collision purposes
- G01S13/931—Radar or analogous systems specially adapted for specific applications for anti-collision purposes of land vehicles
- G01S2013/932—Radar or analogous systems specially adapted for specific applications for anti-collision purposes of land vehicles using own vehicle data, e.g. ground speed, steering wheel direction
Landscapes
- Engineering & Computer Science (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Computer Networks & Wireless Communication (AREA)
- Radar Systems Or Details Thereof (AREA)
- Traffic Control Systems (AREA)
Abstract
Description
"Procédé de mesure de la distance de séparation entre deux
véhicules en circulation"
L'invention se rapporte à un procédé de mesure de la distance de séparation entre deux véhicules circulant l'un derrière l'autre sur une voie, ce procédé étant mis en oeuvre à partir d'un cinémomètre à faisceau, typiquement un radar."Method for measuring the separation distance between two
vehicles in circulation "
The invention relates to a method for measuring the separation distance between two vehicles traveling one behind the other on a track, this method being implemented using a beam cinemometer, typically a radar.
L'invention s'applique plus particulièrement aux contrôles routiers et permet, en complétant à peu de frais les équipements de contrôle de vitesse, d'obtenir des informations supplémentaires sur le comportement plus ou moins dangereux des automobilistes, dépassant ou non la vitesse autorisée. The invention applies more particularly to roadside checks and makes it possible, by inexpensively completing the speed control equipment, to obtain additional information on the more or less dangerous behavior of motorists, whether or not exceeding the authorized speed.
On connaît un système de mesure de la distance de séparation entre véhicules, qui nécessite une implantation au sol de plusieurs éléments optiques. I1 s'agit donc d'une infrastructure destinée à être implantée le long d'une voie de circulation, à un endroit choisi. L'installation est coûteuse et ne peut être facilement déplacée. A system for measuring the separation distance between vehicles is known, which requires the installation on the ground of several optical elements. It is therefore an infrastructure intended to be installed along a traffic lane, at a chosen location. Installation is expensive and cannot be easily moved.
L'invention permet de disposer d'une installation facilement déplaçable, voire mobile, adaptable à peu de frais à la plupart des cinémomètres à faisceau, principalement ceux qui utilisent des radars de contrôle de vitesse. The invention makes it possible to have an easily movable or even mobile installation which can be inexpensively adapted to most beam cinemometers, mainly those which use speed control radars.
Plus particulièrement, l'invention concerne donc un procédé de mesure de la distance de séparation entre deux véhicules en circulation sur une même voie, mettant en oeuvre un cinémomètre à faisceau, par exemple du type radar, caractérisé en ce qu'il consiste à relever le moment où chaque véhicule entre dans ledit faisceau et le moment où il en sort et à calculer ladite distance à partir de telles données relatives à deux véhicules correspondants et des données normales de vitesse et éventuellement d'accélération fournies par ledit cinémomètre. More particularly, the invention therefore relates to a method of measuring the separation distance between two vehicles running on the same lane, using a beam kinemometer, for example of the radar type, characterized in that it consists in recording the moment when each vehicle enters said beam and the moment when it leaves and calculating said distance from such data relating to two corresponding vehicles and from normal speed and possibly acceleration data supplied by said speedometer.
Le calcul précité diffère, comme on le verra plus loin, selon que l'accélération est ou non prise en compte et selon qu'on opère à poste fixe ou à bord d'un véhicule porteur. The aforementioned calculation differs, as will be seen below, depending on whether or not acceleration is taken into account and depending on whether one operates at a fixed position or on board a carrier vehicle.
Selon une variante avantageuse, applicable dans le cas où l'équipement de contrôle est embarqué à bord d'un tel véhicule porteur, le calcul peut prendre en compte la distance parcourue par le véhicule porteur entre le moment où l'un des véhicules sort dudit faisceau et le moment où l'autre véhicule y rentre. Ce mode opératoire est intéressant car il dispense de prendre en compte l'accélération du véhicule porteur. En outre, le procédé peut s'appliquer à des cinémomètres mobiles prenant pour référence de vitesse par rapport au sol, une chaîne tachymétrique. According to an advantageous variant, applicable in the case where the control equipment is carried on board such a carrier vehicle, the calculation can take into account the distance traveled by the carrier vehicle between the time when one of the vehicles leaves said carrier beam and when the other vehicle enters it. This operating mode is interesting because it dispenses with taking into account the acceleration of the carrier vehicle. In addition, the method can be applied to mobile kinemometers taking as speed reference with respect to the ground, a tachymeter chain.
L'invention sera mieux comprise et d'autres avantages de celle-ci apparaîtront plus clairement à la lumière de la description qui va suivre de plusieurs variantes du procédé de mesure conforme à son principe, donnée uniquement à titre d'exemple et faite en référence aux dessins annexés dans lesquels::
- la figure 1 est un schéma illustrant l'implantation, le long d'une voie de circulation, d'un équipement permettant la mise en oeuvre du procédé de mesure selon l'invention;
- la figure 2 est un schéma-bloc d'un équipement permettant la mise en oeuvre du procédé;
- la figure 3 est un schéma illustrant l'implantation, à bord d'un véhicule porteur, d'un équipement permettant la mise en oeuvre du procédé selon l'invention, dans le cas où ledit véhicule porteur est dépassé par les véhicules à contrôler;
- la figure 4 est un schéma illustrant l'implantation à bord d'un véhicule porteur, d'un équipement permettant la mise en oeuvre du procédé, dans le cas où ledit véhicule porteur dépasse les véhicules à contrôler; et
- la figure 5 est un schéma illustrant une variante du procédé avec véhicule porteur.The invention will be better understood and other advantages thereof will appear more clearly in the light of the description which follows of several variants of the measurement method in accordance with its principle, given solely by way of example and made with reference to the accompanying drawings in which:
- Figure 1 is a diagram illustrating the installation, along a traffic lane, of equipment allowing the implementation of the measurement method according to the invention;
- Figure 2 is a block diagram of equipment for implementing the method;
- Figure 3 is a diagram illustrating the installation, on board a carrier vehicle, of equipment allowing the implementation of the method according to the invention, in the case where said carrier vehicle is overtaken by the vehicles to be checked ;
- Figure 4 is a diagram illustrating the installation on board of a carrier vehicle, of equipment allowing the implementation of the method, in the case where said carrier vehicle exceeds the vehicles to be checked; and
- Figure 5 is a diagram illustrating a variant of the method with carrier vehicle.
En se reportant aux figures 1 et 2, on a représenté une route ou une voie d'autoroute 11 sur laquelle deux véhicules A et B circulent l'un derrière l'autre dans le sens de la flèche F. Soit Va et Vb leurs vitesses respectives. On désire savoir si le véhicule B, en seconde position, se maintient à une distance de sécurité donnée du véhicule A. Selon la version la plus simple de l'invention, on met en place, sur le bord de la chaussée, un équipement de contrôle R comportant essentiellement un cinémomètre à faisceau, en l'occurrence ici un dispositif de type radar à effet Doppler. Classiquement, le faisceau 12, dans ce type de radar, est étroit et dirigé obliquement vers les véhicules, comme représenté.S'agissant d'un radar, il est facile de déterminer et mémoriser l'instant où un véhicule "entre" dans le faisceau et donne par conséquent naissance à un écho et de déterminer et mémoriser l'instant où ce même véhicule "sort" du faisceau, lorsque l'écho disparait. Referring to Figures 1 and 2, there is shown a road or a highway 11 on which two vehicles A and B travel one behind the other in the direction of the arrow F. Let Va and Vb their speeds respective. We want to know if vehicle B, in second position, maintains a given safety distance from vehicle A. According to the simplest version of the invention, we install, on the edge of the road, control R essentially comprising a beam cinemometer, in this case a device of the radar type with Doppler effect. Conventionally, the beam 12, in this type of radar, is narrow and directed obliquely towards the vehicles, as shown. Being a radar, it is easy to determine and memorize the instant when a vehicle "enters" the beam and consequently gives rise to an echo and to determine and memorize the moment when this same vehicle "leaves" the beam, when the echo disappears.
Soient Tea et Tsa ces deux instants pour le véhicule A et
Teb et Tsb ces deux instants pour le véhicule B. D'autre part, la fonction première du radar R est de déterminer les vitesses des véhicules A et B. Soient Va et Vb ces deux vitesses. Si on accepte l'erreur de mesure résultant du fait que les accélérations des véhicules ne sont pas prises en compte, l'espacement E entre les véhicules est donné par l'équation:
E = Va (Teb - Tsa)
La figure 2 illustre schématiquement le progiciel ou le logiciel qui peut être associé au radar Doppler R pour élaborer une grandeur de mesure représentative de cet espacement E. Au passage de chaque véhicule, le radar R fournit une information V représentative de la vitesse.Let Tea and Tsa be these two moments for vehicle A and
Teb and Tsb these two instants for vehicle B. On the other hand, the primary function of radar R is to determine the speeds of vehicles A and B. Let Va and Vb be these two speeds. If we accept the measurement error resulting from the fact that vehicle accelerations are not taken into account, the spacing E between the vehicles is given by the equation:
E = Va (Teb - Tsa)
FIG. 2 schematically illustrates the software package or the software which can be associated with the Doppler R radar to develop a measurement quantity representative of this spacing E. At the passage of each vehicle, the R radar provides information V representative of the speed.
C'est sa fonction normale. La vitesse de chaque véhicule est donc mémorisée dans la mémoire M. Dans le même temps, il pilote des moyens générateurs d'impulsions I fournissant une impulsion Te à l'entrée du véhicule dans le faisceau et une impulsion Ts à sa sortie du faisceau. Ces impulsions sont "comparées" à une horloge interne pour permettre de déterminer l'heure "d'entrée" et l'heure de "sortie" de chaque véhicule, par rapport au faisceau. Ces données sont mémorisées dans la mémoire M. Une unité de calcul C, à microprocesseur, associée à la mémoire M peut déterminer la valeur E à partir des données recueillies qui correspondent à deux véhicules consécutifs. Concrètement, l'unité de calcul est programmée pour résoudre l'équation indiquée cidessus.It is its normal function. The speed of each vehicle is therefore stored in memory M. At the same time, it controls pulse generator means I supplying a pulse Te at the entry of the vehicle into the beam and a pulse Ts at its exit from the beam. These pulses are "compared" to an internal clock to determine the "entry" time and the "exit" time for each vehicle, relative to the beam. These data are stored in the memory M. A computing unit C, with microprocessor, associated with the memory M can determine the value E from the data collected which correspond to two consecutive vehicles. Concretely, the calculation unit is programmed to solve the equation indicated above.
Selon une variante, le système peut être complété pour prendre en compte l'accélération des véhicules, dans les calculs. Dans ce cas, le radar R fournit aussi à la mémoire
M des données G représentatives de l'accélération de chaque véhicule et la programmation du calculateur C est modifiée en conséquence pour corriger la valeur calculée de E en fonction de ses variations de vitesse mesurées. L'équation programmée dans C est alors: 2
E = Va (Teb - Tsa) + 1/2 Ga (Teb - Tsa)
La figure 3 illustre une variante dans laquelle le radar R et les équipements annexes de la figure 2 sont embarqués dans un véhicule porteur P. Dans le cas de figure représenté, ce véhicule P est dépassé par les véhicules contrôlés A et B. Soit Vp la vitesse de ce véhicule porteur.Cette vitesse peut par exemple être mesurée par un radar supplémentaire Rp (illustré en trait interrompu sur la figure 2) porté par le véhicule et dont le faisceau est dirigé vers le sol. Ce radar Rp délivre donc des informations Vp et Gp respectivement représentatives de la vitesse et de l'accélération du véhicule porteur.According to a variant, the system can be completed to take into account the acceleration of the vehicles, in the calculations. In this case, the radar R also provides the memory
M of the data G representative of the acceleration of each vehicle and the programming of the computer C is modified accordingly to correct the calculated value of E as a function of its measured speed variations. The equation programmed in C is then: 2
E = Va (Teb - Tsa) + 1/2 Ga (Teb - Tsa)
FIG. 3 illustrates a variant in which the radar R and the ancillary equipment of FIG. 2 are on board a carrier vehicle P. In the illustrated case, this vehicle P is overtaken by the controlled vehicles A and B. Let Vp be speed of this carrier vehicle. This speed can for example be measured by an additional radar Rp (illustrated in broken lines in FIG. 2) carried by the vehicle and whose beam is directed towards the ground. This radar Rp therefore delivers information Vp and Gp respectively representative of the speed and acceleration of the carrier vehicle.
Si on ne tient pas compte de l'accélération, le calculateur est programmé pour résoudre l'équation:
E = (Va - Vp) (Teb - Tsa)
En revanche, si on veut une mesure plus précise tenant compte des accélérations des véhicules, le calculateur C est programmé pour résoudre l'équation:
E = (Teb - Tsa) [(Va - Vp) + (Teb - Tsa)2(Ga - Gp)]
2
Dans l'exemple de la figure 4, semblable au cas de la figure 3, c'est le véhicule porteur P qui dépasse les véhicules contrôlés A et B. Ce cas de figure est plus adapté au contrôle des poids lourds. L'équipement est le même que précédemment décrit mais le calculateur C est programmé différemment.Plus précisément, si on néglige les accélérations des véhicules, l'équation résolue par le calculateur est:
E = (Vp - Vb)(Teb - Tsa)
Si on désire une mesure plus précise tenant compte des accélérations des véhicules, alors le calculateur C est programmé pour résoudre l'équation
E = (Teb - Tsa) [(Vp - Vb) + (Teb - Tsa) 2 (Gr > - Cb ]
2
Enfin, l'exemple de la figure 5 illustre un cas peu différent de celui de la figure 4, c'est-à-dire avec un véhicule porteur P dépassant les véhicules contrôlés mais un principe de calcul qui permet de s'affranchir de la mesure d'accélération du véhicule porteur P, en prenant en compte la distance parcourue par celui-ci entre le moment
Tsb où le faisceau "quitte" le véhicule B en seconde position et le moment Tea où il rejoint le véhicule A.Soit
A, B et P les positions des véhicules à Tsb et A', B', P' les positions des véhicules à Tea. La distance parcourue par le véhicule porteur P entre ces deux instants est Dp.If the acceleration is not taken into account, the computer is programmed to solve the equation:
E = (Va - Vp) (Teb - Tsa)
On the other hand, if we want a more precise measurement taking account of vehicle accelerations, the computer C is programmed to solve the equation:
E = (Teb - Tsa) [(Va - Vp) + (Teb - Tsa) 2 (Ga - Gp)]
2
In the example of FIG. 4, similar to the case of FIG. 3, it is the carrier vehicle P which exceeds the controlled vehicles A and B. This scenario is more suited to the control of heavy goods vehicles. The equipment is the same as previously described but the computer C is programmed differently. More precisely, if we neglect the vehicle accelerations, the equation solved by the computer is:
E = (Vp - Vb) (Teb - Tsa)
If we want a more precise measurement taking into account vehicle accelerations, then the computer C is programmed to solve the equation
E = (Teb - Tsa) [(Vp - Vb) + (Teb - Tsa) 2 (Gr> - Cb]
2
Finally, the example of FIG. 5 illustrates a case that is little different from that of FIG. 4, that is to say with a carrier vehicle P overtaking the controlled vehicles but with a calculation principle which makes it possible to overcome measurement of acceleration of the carrier vehicle P, taking into account the distance traveled by it between the moment
Tsb where the beam "leaves" vehicle B in second position and the moment Tea when it joins vehicle A. Either
A, B and P the positions of the vehicles at Tsb and A ', B', P 'the positions of the vehicles at Tea. The distance traveled by the carrier vehicle P between these two instants is Dp.
Soient Va et Ga la vitesse et l'accélération du véhicule A.Let Va and Ga be the speed and acceleration of vehicle A.
Da est la distance parcourue par A entre les deux instants
Tsb et Tea. La distance initiale E, recherchée, entre les deux véhicules A et B est Dp - Da avec:
2
Da = (Tea - Tsb) Va + Ca (Tea - Tsb)
2
Par conséquent, le calculateur C est programmé pour résoudre 1 'équation
E = Dp - [(Tea - Ts) Va + Ca (Tea - Tsb) 2]
2
Dp est facilement accessible, par exemple, comme mentionné précédemmemnt à partir d'une chaîne tachymétrique ou encore en utilisant des indications de distance parcourue, fournies par le radar à effet Doppler Rp, dont le faisceau est dirigé vers le sol. Ce radar délivre une information de vitesse "sol" chaque fois que le véhicule porteur parcourt une distance fixe, par exemple 0,1 mètre.
Un simple comptage entre Tsb et Tea de ces parcours élémentaires permet d'obtenir la valeur de Dp avec une précision meilleure que 1 mètre. Da is the distance traveled by A between the two instants
Tsb and Tea. The initial distance E, sought, between the two vehicles A and B is Dp - Da with:
2
Da = (Tea - Tsb) Va + Ca (Tea - Tsb)
2
Consequently, the computer C is programmed to solve the equation
E = Dp - [(Tea - Ts) Va + Ca (Tea - Tsb) 2]
2
Dp is easily accessible, for example, as mentioned previously from a tachymeter chain or even using distance traveled indications, provided by the Doppler Rp radar, whose beam is directed towards the ground. This radar delivers “ground” speed information each time the carrier vehicle travels a fixed distance, for example 0.1 meter.
A simple count between Tsb and Tea of these elementary routes makes it possible to obtain the value of Dp with an accuracy better than 1 meter.
Claims (4)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR9503881A FR2732471B1 (en) | 1995-04-03 | 1995-04-03 | METHOD FOR MEASURING THE SEPARATION DISTANCE BETWEEN TWO VEHICLES IN CIRCULATION |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR9503881A FR2732471B1 (en) | 1995-04-03 | 1995-04-03 | METHOD FOR MEASURING THE SEPARATION DISTANCE BETWEEN TWO VEHICLES IN CIRCULATION |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| FR2732471A1 true FR2732471A1 (en) | 1996-10-04 |
| FR2732471B1 FR2732471B1 (en) | 1997-06-06 |
Family
ID=9477671
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FR9503881A Expired - Fee Related FR2732471B1 (en) | 1995-04-03 | 1995-04-03 | METHOD FOR MEASURING THE SEPARATION DISTANCE BETWEEN TWO VEHICLES IN CIRCULATION |
Country Status (1)
| Country | Link |
|---|---|
| FR (1) | FR2732471B1 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1099960A1 (en) * | 1999-11-12 | 2001-05-16 | Robert Sierzega | Measuring procedure for the determination and documentation of the distance between two vehicles |
| FR2823352A1 (en) * | 2001-04-04 | 2002-10-11 | Positive | Spacing control for motor vehicles has spaced detectors on side of road to sense presence of vehicles and identify vehicles driving too close to others |
| FR2873480A1 (en) * | 2004-07-21 | 2006-01-27 | Sagem | Vehicle e.g. heavy vehicle, speed monitoring system, has Doppler radar calculating speed using received signals, and category selection unit selecting vehicle category based on vehicle profile derived from distance between vehicle and radar |
| CN1302444C (en) * | 2005-03-25 | 2007-02-28 | 上海百太信息科技有限公司 | A digital image shooting system triggered by acceleration signal |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4173010A (en) * | 1975-05-01 | 1979-10-30 | Hoffmann Anton R | Traffic sign and improved system for recording vehicle speed |
| DE3335747A1 (en) * | 1983-10-01 | 1985-04-11 | Ulrich 4350 Recklinghausen Lüding | Method and device for monitoring the change in spacing of, in particular, motor vehicles on roads |
| EP0339988A2 (en) * | 1988-04-27 | 1989-11-02 | Driver Safety Systems Ltd | Traffic safety monitoring apparatus |
| GB2269693A (en) * | 1992-08-11 | 1994-02-16 | Truvelo Manufacturers | Traffic monitoring |
| DE4235232A1 (en) * | 1992-10-15 | 1994-04-21 | Refit E V Verein Zur Regionalf | Continuous determination of vehicle speeds and distances - using video-camera with vertical optical axis above road and successively timed exposures referred to uniformly spaced reference planes. |
-
1995
- 1995-04-03 FR FR9503881A patent/FR2732471B1/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4173010A (en) * | 1975-05-01 | 1979-10-30 | Hoffmann Anton R | Traffic sign and improved system for recording vehicle speed |
| DE3335747A1 (en) * | 1983-10-01 | 1985-04-11 | Ulrich 4350 Recklinghausen Lüding | Method and device for monitoring the change in spacing of, in particular, motor vehicles on roads |
| EP0339988A2 (en) * | 1988-04-27 | 1989-11-02 | Driver Safety Systems Ltd | Traffic safety monitoring apparatus |
| GB2269693A (en) * | 1992-08-11 | 1994-02-16 | Truvelo Manufacturers | Traffic monitoring |
| DE4235232A1 (en) * | 1992-10-15 | 1994-04-21 | Refit E V Verein Zur Regionalf | Continuous determination of vehicle speeds and distances - using video-camera with vertical optical axis above road and successively timed exposures referred to uniformly spaced reference planes. |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1099960A1 (en) * | 1999-11-12 | 2001-05-16 | Robert Sierzega | Measuring procedure for the determination and documentation of the distance between two vehicles |
| FR2823352A1 (en) * | 2001-04-04 | 2002-10-11 | Positive | Spacing control for motor vehicles has spaced detectors on side of road to sense presence of vehicles and identify vehicles driving too close to others |
| FR2873480A1 (en) * | 2004-07-21 | 2006-01-27 | Sagem | Vehicle e.g. heavy vehicle, speed monitoring system, has Doppler radar calculating speed using received signals, and category selection unit selecting vehicle category based on vehicle profile derived from distance between vehicle and radar |
| CN1302444C (en) * | 2005-03-25 | 2007-02-28 | 上海百太信息科技有限公司 | A digital image shooting system triggered by acceleration signal |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2732471B1 (en) | 1997-06-06 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101434234B (en) | Vehicle control device, vehicle control method | |
| FR2731515A1 (en) | DEVICE FOR DETERMINING THE DISTANCE OF A VEHICLE IN RELATION TO A SIDE MARKING OF THE PAVEMENT | |
| EP2448786B1 (en) | Method for controlling a vehicle member | |
| EP1415856B1 (en) | Method for controlling a vehicle headlamp and system for carrying out such a method | |
| CN108290577A (en) | Controller of vehicle | |
| FR2753289A1 (en) | METHOD AND DEVICE FOR AUTOMATICALLY DETECTING THE DIRECTION OF CIRCULATION IN A MOTOR TRAFFIC | |
| FR2983799A1 (en) | METHOD AND DEVICE FOR CONTROLLING THE LIGHT EMISSION OF A VEHICLE PROJECTOR | |
| FR2704653A1 (en) | Driving assistance method for a lane change of a motor vehicle. | |
| EP2521921B1 (en) | Device for measuring the speed of displacement of an object deforming the lines of the terrestrial magnetic field | |
| FR3078517A1 (en) | METHOD AND DEVICE FOR ASSISTING THE AUTOMATED DRIVING OF A VEHICLE CLOSE TO THE OBLIGED PASSENGER ZONE (S). | |
| FR3077382A1 (en) | METHOD AND ELECTRONIC DEVICE FOR CONTROLLING THE SPEED OF AN AUTONOMOUS VEHICLE, COMPUTER PROGRAM, AUTONOMOUS VEHICLE AND SUPERVISION PLATFORM THEREFOR | |
| WO2018219579A1 (en) | Assisting the driving of an automotive vehicle on the approach to a toll barrier | |
| JP4036119B2 (en) | Vehicle detection device and vehicle detection method | |
| JPWO2019216386A1 (en) | Vehicle control unit and vehicle | |
| FR2732471A1 (en) | Method for measuring space separating two cars driving on same lane | |
| FR3050162B1 (en) | DEVICE FOR ASSISTING THE DRIVING OF A VEHICLE IN A PASSAGE AREA OBLIGED | |
| JP4120430B2 (en) | Object discrimination device | |
| EP1007976B1 (en) | Method for measuring the yaw velocity of a vehicle | |
| EP1528409B1 (en) | Method and system for measuring the speed of a vehicle on a curved trajectory | |
| FR2510756A1 (en) | METHOD AND DEVICE FOR CONTROLLING THE CONDITION OF A MOTOR VEHICLE | |
| EP3830740A1 (en) | Method for determining a type of parking space | |
| JP2005010877A (en) | Driving condition determination system and driving condition determination method | |
| KR102595467B1 (en) | Information analysis system using image and method thereof | |
| FR3098620A1 (en) | Method of generating a visual representation of the driving environment of a vehicle | |
| JPH07306053A (en) | Control device for vehicle-mounted equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| TP | Transmission of property | ||
| CD | Change of name or company name | ||
| ST | Notification of lapse |
Effective date: 20131231 |