EP0435055B1 - Zeitmesseinrichtung für Fahrzeuge - Google Patents

Zeitmesseinrichtung für Fahrzeuge Download PDF

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Publication number
EP0435055B1
EP0435055B1 EP90123723A EP90123723A EP0435055B1 EP 0435055 B1 EP0435055 B1 EP 0435055B1 EP 90123723 A EP90123723 A EP 90123723A EP 90123723 A EP90123723 A EP 90123723A EP 0435055 B1 EP0435055 B1 EP 0435055B1
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EP
European Patent Office
Prior art keywords
signal
duration
moving
signals
station
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EP90123723A
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English (en)
French (fr)
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EP0435055A1 (de
Inventor
Roland Rebetez
Jean-Pierre Voillat
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Omega Electronics SA
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Omega Electronics SA
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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
    • G—PHYSICS
    • G04—HOROLOGY
    • G04F—TIME-INTERVAL MEASURING
    • G04F10/00—Apparatus for measuring unknown time intervals by electric means
    • G—PHYSICS
    • G04—HOROLOGY
    • G04F—TIME-INTERVAL MEASURING
    • G04F8/00—Apparatus for measuring unknown time intervals by electromechanical means
    • G04F8/08—Means used apart from the time-piece for starting or stopping same
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
    • G07C1/00—Registering, indicating or recording the time of events or elapsed time, e.g. time-recorders for work people
    • G07C1/22—Registering, indicating or recording the time of events or elapsed time, e.g. time-recorders for work people in connection with sports or games
    • G07C1/24—Race time-recorders

Definitions

  • the present invention relates to a device for identifying and determining the instant of passage of a plurality of mobiles on a reference line, device comprising a fixed station comprising a transceiver equipped with an antenna located at the vicinity of the reference line and a plurality of mobile stations comprising a transceiver, one of said mobile stations being on board in each of the mobiles, the fixed station being arranged to transmit a radio signal and to receive radio signals from the different stations mobile, the mobile stations being arranged to receive the radio signal transmitted by the fixed station and to develop in response to said signal, a transmission signal picked up by the fixed station and allowing the determination of the passage time and the identity of each mobile.
  • the installation described in document FR-A-2 619 644 comprises a plurality of main transmitters carried by the respective vehicles to be detected and generating each an electromagnetic wave modulated by a high frequency respectively associated with the vehicle considered, this electromagnetic wave preferably being of the infrared domain.
  • the installation also includes a main receiver comprising a sensor based at a fixed station at a detection location, and sensitive to the electromagnetic waves generated by the various main transmitters.
  • the receiver also comprises a plurality of modules in number equal to the number of transmitters and each provided with discrimination means capable of isolating respectively, from the signal from the sensor, a specific high frequency component and means capable of detecting the maximum of amplitude of this component.
  • Document US-A-4 495 496 describes a person detection installation intended in particular to be installed in a mine to periodically check the presence of each of the miners in a given region of the mine.
  • the installation comprises a plurality of fixed transceivers arranged at various locations of the mine, and provided for periodically transmitting an interrogation signal.
  • Each minor also carries an identification answering machine powered by a battery and equipped with an antenna. If a particular minor is within radio range of one of the transceiver modules, his identification responder will respond to the interrogation signal with a signal. This last signal being transmitted with a certain delay which is different from the delays of the signals transmitted by the answering machines of other minors. Thus, it is possible to identify minors in the vicinity, and therefore within radio range, of each of the fixed transceivers.
  • the installation which has just been described is intended to control the presence of a person in a given region and is not suitable absolutely not to determine a passage time on a reference line.
  • the object of the present invention is to avoid the drawbacks of the prior art by using a device comprising a single receiver which listens to the various emissions originating from vehicles, this receiver having a relatively simple structure because using digital sampling techniques. Such techniques have never been proposed for the timing of sports races.
  • the subject of the present invention is a device according to claim 1.
  • FIG. 1a shows a race track 3 on which several cars or mobiles 4 are in competition.
  • the device which will be described allows the identification and the determination of the instant of passage of the mobiles 4 on a reference line - which may be the finish line - this reference line being here confused with a cable 30 forming antenna.
  • a reference line - which may be the finish line - this reference line being here confused with a cable 30 forming antenna.
  • FIG. 1a shows a vehicle M2 bearing the number 2 which has already crossed the line and a vehicle Mn bearing the number n which approaches this line
  • a transmitter EM2 - receiver REC1 symbolized by the digit 1.
  • This transceiver is connected to an antenna 10 linked to the vehicle 4.
  • this transceiver will preferably be called a mobile station or else MIT (de mobile identifier transmitter) possibly followed by a number order.
  • MITn symbolizes the mobile station on board the vehicle Mn.
  • the figure shows that at the edge of track 3 there is a fixed transmitter EM1-receiver REC2 symbolized by the number 2.
  • This transmitter-receiver will preferably be called hereinafter fixed station.
  • the fixed station is linked to the antenna 30 located in the vicinity or merged with the reference line. Quite generally, the fixed station 2 is arranged to transmit a radio signal and to receive radio signals from different mobile stations 1.
  • the mobile stations 1 are arranged to receive the radio signal transmitted by the fixed station 2 and to develop, in response to said signal, a transmission signal received by the fixed station 2, which allows - as will be seen in detail below - the determination of the passage time and the identification of each mobile 4.
  • FIG. 1b We will now refer to FIG. 1b to explain more specifically the content of the invention.
  • vehicles 4 running on a track 3, each vehicle carrying with it a mobile station 1.
  • the fixed station 2 At the edge of the track is the fixed station 2 which we have already mentioned.
  • the mobile station 1 transmitted continuously - as is the case with the device described in the document cited FR-A-2 619 644 - the antenna 30 would receive a continuous signal 5 in the shape of a bell, the maximum amplitude of which would be located in the vicinity of the antenna 30. Still according to the same document, a differentiation of this bell curve would then make it possible to know with exactitude the time of passage of the vehicle on the antenna 30 .
  • the fixed station 2 transmits a radio signal modulated by a so-called low frequency synchronization signal of period T which is, for example, 2 ms (500 Hz).
  • This signal is received by the mobile station 1.
  • the mobile station is provided with means disposing the latter to transmit, during each period T a signal of duration Tn much smaller than T and which occupies within the period T, a rank which is proper to it with respect to a time to marking the beginning of each period T.
  • the signal Tn the duration of which is exaggeratedly long compared to the signal T to make the explanation clearer, begins with the beginning of the period T.
  • Another vehicle would present the same signal Tn, but offset from the start to of period T. All the signals of duration Tn shown in FIG. 1b are emitted by the same vehicle since they all have the same rank for all successive periods T.
  • the mobile station 1 also comprises means for assigning to each signal of duration Tn an identification code specific to each particular vehicle, the signals of duration Tn thus obtained modulating the radio signal transmitted by the transmitter EM2 of the mobile station 1, as will appear in detail when the operation of this mobile station is explained with the help of FIG. 2.
  • the signals transmitted by the mobile station 1 are received by the fixed station 2 which comprises, as will be seen in FIGS. 6a and 6b, first means for recognizing the signals of duration Tn belonging to the same mobile, second means for taking into account the respective amplitude of these signals and third means for locating these signals with respect to an absolute time. As will appear later, all these signals are stored in a memory and then processed by a microprocessor to make them usable on any display system.
  • FIG. 2 A possible execution diagram appears in FIG. 2 and time diagrams corresponding to this diagram are shown in FIGS. 3, 4 and 5.
  • Each vehicle includes such a mobile station. This station has electronic circuits connected together by connections which appear on the diagram.
  • the transmitter EM1 of the fixed station transmits a radio signal which is received by the mobile station on its receiver REC1 via its antenna 10.
  • the receiver 11 delivers a synchronization signal to low frequency of period T on its "synchro" output and a signal indicating that the level of the synchronization signal is sufficient.
  • These signals appear in Figure 3.
  • the mobile station or MIT is at rest (TR) while after receiving this signal it is in activity (TM).
  • the signal level is connected to input D (data) and to terminal R (reset) of a type D flip-flop referenced 12, the clock input CK (clock) of this flip-flop receiving the synchronization signal "synchro".
  • the flip-flop As soon as the level level goes to 1, the flip-flop is put in the waiting position for the first falling edge of the synchro T. Before that, we understand that, as long as the input D is at zero, the output Q of the flip-flop is zero. As soon as the level level goes to 1, the first positive edge of the synchro T causes the output Q of the flip-flop to go to 1 which is connected to the reset input of a binary counter 13. This change to 1 resets all the Q outputs (Q0 to QA6) of the counter to zero and the EOC (end of count) output of said counter to 1. It is understood that before the output Q of the flip-flop 12 is raised to 1, the synchro T is invalid (SNV) while it is valid (SV) after this climb.
  • the EOC output of counter 13 and the synchronization signal are connected to the input of a NAND gate 15.
  • the output of gate 15 is connected to the first input of an AND gate 14 which receives on its second input the signal delivered by a high frequency time base 16.
  • the output of gate 15 is at zero, the output of the gate 14, connected to the clock clock input of the counter 13, is also at zero and this state is stable as long as the EOC output of the counter remains at 1.
  • the EOC output goes to zero, which gives 1 to the output of the gate 15 so that the gate 14 lets pass the high frequency signal coming from the time base 16, which causes the binary counter 13 to start.
  • the negative side of the synchro corresponds to the time to marking the start of each period T.
  • the MIT is outside the transmission area (TNEM) while it is in the transmission area (TEM) upon receipt of the side negative.
  • FIG. 2 shows that the MIT also comprises a code generator 24 which can be an EEPROM memory.
  • This generator 24 includes outputs A0 to A6 which are permanently in predetermined logic states, these states being different for each of the MITs considered.
  • the outputs A0 to A6 of the generator 24 are connected to the inputs A0 to A6 of a code comparator 25 which receives at its inputs QA0 to QA6 the outputs QA0 to QA6 of the binary counter 13. As shown in the diagram in FIG.
  • FIG. 2 also shows that the mobile station includes an operator 26 receiving on its inputs the logic values present at the outputs Q3 to QA6 of the binary counter 13. This operator is wired to perform two logical operations according to the equations indicated in the figure.
  • the first logic equation delivers at its output 80 an ENEM signal (enable emission) which results from the combination of the signals Q5 and Q6 as is apparent on the diagram of FIG. 4.
  • ENEM defines the precise time during which the MIT found on broadcast. We see in Figure 2 that the ENEM signal is sent to a third input of gate 20.
  • the output of the AND gate 20 is connected to a first input of an AND gate 21.
  • the second logical operation executed by the operator 26 is carried out by the equation written on nine lines in the frame delimiting the operator.
  • This operator delivers on its output 81 a signal EN9M (enable 9 MHz) which results from the combination of the logic states Q3 to QA6 present at the input of the operator.
  • This signal EN9M appears in FIG. 4 and is found to include the identification code specific to the MIT considered (here the 22 nd).
  • the EN9M signal is sent to a first inverted input of a NAND gate 17 and to a first input of a NAND gate 18. When EN9M is zero, gate 17 and the 4.5 MHz signal are opened present at the second entrance to door 17 is found at the exit of this door.
  • the signal SGE of duration Tn comprises the juxtaposition of twelve bits Tb whose durations are equal.
  • B zero status bits
  • C status bit 1
  • D actual coding bits
  • E parity bit
  • the parity is given by the generator 24, then introduced into the operator 26 in the same way as a logic state Q3 to QA6.
  • the parity bit is followed by a zero status bit (F), called the end-bit, which signals the end of the transmission.
  • F zero status bit
  • Tb a value for Tb equal to the period 1 / f1 delivered by the time base at high frequency, period multiplied by 23, has been chosen.
  • FIG. 4 also shows that the duration signal Tn transmitted by a determined mobile station or MIT (here MIT number 22) is separated from the duration signal Tn transmitted by the next station (here MIT number 23) by a security period Ts (G).
  • This period is a zone of silence. It is understood that each MIT individually calculating its transmission area from an internal time base, the latter will always have a small frequency disparity compared to the other time bases. It is therefore necessary to ensure the mentioned security period to avoid possible overlapping of IMTs.
  • Figure 4 shows that the safety period occurs as soon as the ENEM signal returns to zero.
  • the recurrence (H) of the signal Tn to which the period Ts is added is 14.222 ⁇ s.
  • the equipment making up the mobile station does not call for any particular remark. It is made up of known elements.
  • the transmitter 22 comprises in the execution carried out which constitutes an example, two carrier frequencies, one at 427 MHz (which expresses the logic state 1), and the other at 422.5 MHz (which expresses the state logic 0).
  • the code generator 24 is an EEPROM memory of the 93 C 46 type.
  • the other components enclosed in the frame 27 in broken lines constitute a programmable logic circuit (gate array), for example of the EP 900 type from the company Altera.
  • the time base 16 is a quartz oscillator whose frequency is 9 MHz.
  • the level level received by the MIT allows it to be put on hold outside the reduced zone where timing and identification must be done (for example ⁇ 1 m from the reference line). We can therefore use supply batteries of much smaller dimensions.
  • Such a watch system is described for example in the document EP-B-0074330 cited above.
  • FIGS. 6a and 6b A possible execution diagram appears in FIGS. 6a and 6b and time diagrams corresponding to this diagram are shown in FIGS. 7 and 8.
  • the fixed station includes a time base 42 producing a high frequency signal. This signal is introduced into a divider 43 which in turn delivers the low frequency synchronization signal of period T also called “synchro". This signal modulates the transmitter EM1, referenced 49, from the fixed station. It is sent by the antenna 30 to the mobile station where it is used as described above. An absolute time generator 41 is incremented by the period signal T.
  • the fixed station also includes a receiver REC2, referenced 31, which receives by the same antenna 30, the signals of duration Tn transmitted by the transmitters EM2 of the various mobile stations. Unlike the mobile stations which all work independently in their own area, but which are all listening to the period synchronization frequency T, the fixed station works in all the areas of the mobile stations to count them all.
  • the fixed station includes a binary counter 37 which receives on its clock input (CK) the high frequency signal.
  • the synchronization signal T is sent to a first input of a NAND gate 38 which receives on its second input the signal EOC (end of count) present at the end of the chain of the binary counter 37.
  • the output of gate 38 is connected to the reset input of the binary counter.
  • the output of gate 38 goes to 1 which has the effect of zeroing all the outputs Q0 to QA6 of the counter and to 1 the EOC output.
  • the synchro T starts (passage from 1 to 0) it is guaranteed that all the outputs Q0 to QA6 are at zero, which occurs with each passage to zero of the synchronization signal.
  • the receiver 31 has a data output through which the duration bits Tb constituting the duration signal Tn from a mobile station pass. These bits Tb are stored by its input IN in a shift register 32 which presents, at the end of the shift and on its start-bit to end-bit outputs, the image of an entire period Tn. It will be noted that the introduction of the signal Tn into the shift register 32 takes place at the rate of a frequency Q2 controlling the clock input CK of the shift register (see FIG. 8). The signals present at the outputs of the shift register are then introduced into the first inputs X0 to X9 of a comparator 33, the second inputs Y1 to Y7 of the same comparator being connected to the outputs QA0 to QA6 of the binary counter 37.
  • l input Y0 of comparator 33 is connected at most to the power supply Vcc which corresponds to the logic value 1 of the start-bit (FIG. 4), and that the input Y9 of the comparator is connected at least to the power supply, this who corresponds to the logical value 0 of the end-bit (figure 4).
  • the parity received on the input X8 and coming from the mobile station must correspond to the parity coming from the fixed station coming from the data QA0 to QA6 controlling a parity generator 34 whose output is connected to the input Y8 of the comparator 33.
  • the value 1 of CMPCK can appear by combining EOC ⁇ Q 5 ⁇ Q6 ⁇ Q1 (figure 8, arrow 60) or by combining EOC ⁇ Q 4 ⁇ Q5 ⁇ Q6 ⁇ Q1 (figure 8, arrow 61).
  • the signal CMPCK is a signal of frequency equal to that of the output Q2 and that it is present in an intentionally large time zone, because the instant when all the signal Tn (figure 8, data line) is obtained n is not very precise, this being due to variations in the synchronization signal. If the input D, i.e.
  • the flip-flop 35 is reset to zero and remains inactive as long as the signal CMPCK remains active. This reset is necessary so that the flip-flop is again ready to collect a new signal of duration Tn.
  • This reset is carried out by the signal CMPCL of short duration and acting on the input R of the flip-flop.
  • the signal CMPCL is produced by the operator 39 and according to the equation presented in the second line.
  • the signal IDOK (output Q of the flip-flop 35) signals stably the fleeting recognition of the arrival of a signal of correct duration Tn or, if desired, the good data in the right rank.
  • FIG. 6a also shows that the signals of duration Tn delivered by the receiver 31 as logical data (data) are also delivered by the same receiver as analog signals having different amplitudes according to their distance from the antenna 30. On therefore finds at the output of receiver 31 these signals of variable amplitudes (level). The level output is connected to the input of an analog-digital converter 44 which presents at its outputs DT0 to DT7 the digital value of the level of the duration signal Tn. The diagram shows that the converter 44 has an input "start convert" by which one can control the instant of the conversion.
  • the conversion control input is controlled by a STRADC signal which comes from the operator 39 according to a logic equation given in the 3rd line. We can see in the diagram of Figure 8 this STRADC signal resulting from the combination of the different outputs Q of the counter 37 arranged according to the above equation (arrow 64).
  • the writing of the data in the memory is carried out by the input WRM which is controlled by a NAND gate 45.
  • the first input of this gate is connected to the IDOK signal and the second input to an output (write) of the operator 39.
  • the memory 47 works in concert with a microprocessor CPU 48.
  • This microprocessor receives at its inputs the same data DT0 to DT7 and AD0 to AD16 present at the input of the memory.
  • the memory used is of the DMA type, that is to say a direct access memory.
  • the system is arranged in such a way that writing to memory takes priority over processing by the CPU.
  • the CPU has a hold input controlled by an AND gate 46.
  • door 46 delivers a signal 1 to the hold input of the CPU.
  • the CPU notices a request to reset the idle state and gives a receipt by releasing (setting at high impedance) all the outputs DTi and ADi by arranging the output HLDA at 1 (see FIG. 8).
  • FIG. 9 shows how the memory 47 is organized. It comprises a network of lines 69 and columns 70 which intersect. A line is representative of the absolute time t and a column is representative of all the signals of duration Tn transmitted by the same MIT. The data relating to the amplitude of a signal of particular duration Tn is located at the intersection Z of a row and a column. It will be noted that it is during writing into memory that the result present at the output of the converter 44 appears on the inputs of memory 47 and will therefore be stored in the row and in the column chosen by the addresses AD0 to AD16. When this operation is finished, the hold signal is cut, which frees the microprocessor CPU 48.
  • the CPU still has two inputs INT1 and INT2 which are so-called interrupt signals (interrupt).
  • the signal INT1 (OVT) coming from the time generator 41 is a signal indicating a timeout. Indeed, the time capacity of the generator 41 is limited to, say, about two minutes. Thus the accounting greater than these two minutes is ensured by the CPU. The latter is therefore warned of each time the maximum capacity of the time generator 41 is exceeded by the line OVT acting on INT1. As shown in the diagram in FIGS. 6a and 6b, the signal INT2 appears on each return of the synchronization signal.
  • the transmitter 49 broadcasts the synchronization signal in frequency modulation.
  • the receiver is tuned to a frequency of the order of 420 MHz (see above). Such a frequency is difficult to transport by cable to a control and processing station far from the race track.
  • a first mobile station near the runway which is capable of operating a frequency change (for example at 34.5 MHz for the signal zero state and at 39 MHz for the signal state 1) .
  • Such frequencies accommodate a wired support to be transported in a control cabin located far from the runway.
  • the CPU 48 could be of the Intel 80286 type, the memory 47 of the HM 64256 Hitachi type and the converter of the LCT 1099 type.
  • the time base 42 is preferably of the quartz type with a frequency equal to 9 MHz.
  • the other elements shown in FIGS. 6a and 6b can be of the conventional type. However, it is preferable to use, as for the mobile station, a programmable logic circuit, for example of the Altera EP 900 type.

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Claims (11)

  1. Einrichtung für die Identifikation und Bestimmung des Zeitpunkts des Passierens einer Referenzlinie durch eine Mehrzahl von Fahrzeugen (4), welche Einrichtung eine stationäre Station (2) umfaßt mit einem Sender/Empfänger, versehen mit einer nahe der Referenzlinie angeordneten Antenne (30) und eine Mehrzahl von beweglichen Stationen (1) mit einem Sender/Empfänger, wobei eine der beweglichen Stationen jeweils in einem der Fahrzeuge mitgeführt wird, wobei die stationäre Station ausgebildet ist zum Aussenden eines funkelektrischen Signals und für den Empfang von funkelektrischen Signalen, die von verschiedenen beweglichen Stationen eintreffen, wobei die beweglichen Stationen ausgebildet sind zum Empfang des funkelektrischen Signals, ausgesandt von der stationären Station und zum Erzeugen, in Reaktion auf dieses Signal, eines Sendesignals, das von der stationären Station erfaßt wird und die Bestimmung der Durchlaufzeit und der Identität jedes Fahrzeugs ermöglicht, dadurch gekennzeichnet, daß das funkelektrische Signal, abgestrahlt von der feststehenden Station, moduliert ist mit einem Synchronisationssignal niedriger Frequenz der Periode T, das von den beweglichen Stationen empfangen wird, wobei jede dieser letzteren mit Mitteln (16, 22, 27) ausgestattet ist, die sie in die Lage versetzen, während jeder Periode T ein Signal der Dauer Tn « T auszusenden, das im Inneren jeder Periode T einen Rang einnimmt, der ihm zugeordnet ist relativ zu einer Zeit to, die den Beginn jeder Periode T markiert, wobei dieser Rang derselbe bleibt für alle aufeinanderfolgenden Perioden T, wobei jede bewegliche Station ferner Mittel (24) umfaßt zum Zuordnen zu jedem Signal der Dauer Tn, das sie aussendet, eines dem Fahrzeug, in dem sie mitgeführt wird, zugeordneten Identifikatoinscodes, wobei die Signale der Dauer Tn, die auf diese Weise erhalten werden, das funkelektrische Signal modulieren, das von den beweglichen Stationen ausgestrahlt wird, daß die funkelektrischen Signale, ausgesandt von den beweglichen Stationen von der stationären Station empfangen werden, die erste Mittel (32, 33, 37) umfaßt zum Wiedererkennen der Signale der Dauer Tn, zugeordnet zu einem gleichen Fahrzeug, zweite Mittel (44) umfaßt zum Berücksichtigen der jeweiligen Amplitude dieser Signale, dritte Mittel (41) umfaßt zum Lokalisieren dieser Signale relativ zu einer Absolutzeit und einen Speicher zum Abspeichern im Inneren einer bestimmten jedem Fahrzeug zugeordneten Zone der so erhaltenen Signale und daß die in dem Speicher abgespeicherten Signale von einem Mikroprozessor verarbeitet werden, um sie verwertbar zu machen für ein Anzeigesystem, wobei diese Signale ermöglichen, die Durchlaufzeiten jedes der Fahrzeuge auf der Referenzlinie zu bestimmen.
  2. Einrichtung nach Anspruch 1, dadurch gekennzeichnet, daß jede bewegliche Station ferner nebem dem Empfänger 11 für den Empfang des Synchronisationssignals der Periode T einen Binärzähler (13) umfaßt, gesteuert von dem Synchronisationssignal, welcher diesem Zähler ermöglicht, Impulse zu zählen, die von einer Zeitbasis (16) mit hoher Frequenz abgegeben werden, wobei ein Codegenerator (24), dessen Ausgänge sich dauernd in vorbestimmten logischen Zuständen entsprechend dem Rang des Signals der Dauer Tn und dem Code, der dieses Signal beeinflußt, befinden, welche Zustände unterschiedlich sind für jede der betrachteten beweglichen Stationen, mit einem Komparator (25) zum Vergleichen der Ausgänge des Codegenerators mit den Ausgängen des Binärzählers und zum Erzeugen eines Logiksignals, wenn diese Ausgänge gleich sind, mit einem Operator (26), der einer vorbestimmten logischen Gleichung gehorcht, wobei die Eingänge des Operators mit den Ausgängen des Binärzählers verbunden sind, wobei ein erster Ausgang (80) des Operators den Sender der beweglichen Station in die Lage versetzt, während des Zeitintervalls, während welchem der Ausgang des Komparators das Logiksignal abgibt, zu senden und ein zweiter Ausgang (81) des Operators mindestens während dieses Intervalls Logikzustände abgibt, entsprechend dem Identifikationscode der betrachteten beweglichen Station, welche Logikzustände das funkelektrische Signal modulieren, das von dem Sender abgestrahlt wird.
  3. Einrichtung nach Anspruch 2, dadurch gekennzeichnet, daß die das funkelektrische Signal modulierenden Logikzustände definiert werden durch ein Signal der Frequenz f1 für den Logikzustand 1 und durch ein Signal der Frequenz f2 für den Logikzustand 0.
  4. Einrichtung nach Anspruch 3, dadurch gekennzeichnet, daß f2 = f1/2.
  5. Einrichtung nach Anspruch 4, dadurch gekennzeichnet, daß f1 = 9 MHz.
  6. Einrichtung nach Anspruch 2, dadurch gekennzeichnet, daß die Zeitbasis (16) eine Frequenz von 9 MHz abgibt.
  7. Einrichtung nach Anspruch 2, dadurch gekennzeichnet, daß das Signal der Dauer Tn die Aneinanderreihung von 12 Bits Tb umfaßt, deren Dauern gleich sind, nämlich in zeitlicher Reihenfolge zwei Bits des Zustands 0 (B), während welchem der Sender anläuft, ein Bit des Zustands 1 (C), das den Bits vorangeht, welche den Code der beweglichen Station definieren, sieben Codifikationsbits (D), deren Zustände unterschiedliche sind je nach der betrachteten beweglichen Station, ein Paritätsbit (E), das zur Kontrolle dient und ein Bit des Zustands 0 (F), nach welchem der Sender unterbrochen wird.
  8. Einrichtung nach Anspruch 7, dadurch gekennzeichnet, daß die Dauer jedes der zwölf Bits Tb gleich der Periode ist, abgegeben von der Zeitbasis (16) mit hoher Frequenz, welche Periode mit 2³ multipliziert ist.
  9. Einrichtung nach Anspruch 7, dadurch gekennzeichnet, daß dann, wenn die Frequenz der Zeitbasis gleich 9 MHz ist, die Dauer jedes der zwölf Bits Tb gleich 888 ns ist und die Dauer des Signals gleich 10,66 µs ist.
  10. Einrichtung nach Anspruch 2, dadurch gekennzeichnet, daß das von einer bestimmten beweglichen Station abgestrahlte Signal der Dauer Tn von dem Signal der Dauer Tn, abgestrahlt von der der bestimmten Station unmittelbar vorhergehenden oder folgenden Station durch eine Sicherheitsperiode Ts (G) ohne Sendebetrieb getrennt ist.
  11. Einrichtung nach Anspruch 1, dadurch gekennzeichnet, daß der Speicher ein Netzwerk von Zeilen und Spalten umfaßt, die einander kreuzen, daß eine Zeile repräsentativ ist für die Absolutzeit, daß eine Spalte repräsentativ ist für alle Signale der Dauer Tn, abgestrahlt von ein- und derselben beweglichen Station und daß eine Größe bezüglich der Amplitude eines bestimmten Signals der Dauer Tn sich an der Schnittstelle einer Zeile und einer Spalte befindet.
EP90123723A 1989-12-26 1990-12-10 Zeitmesseinrichtung für Fahrzeuge Expired - Lifetime EP0435055B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8917295A FR2656447B1 (fr) 1989-12-26 1989-12-26 Dispositif de chronometrage de mobiles.
FR8917295 1989-12-26

Publications (2)

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EP0435055A1 EP0435055A1 (de) 1991-07-03
EP0435055B1 true EP0435055B1 (de) 1994-11-30

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US (1) US5140307A (de)
EP (1) EP0435055B1 (de)
JP (1) JPH04128676A (de)
AT (1) ATE114843T1 (de)
AU (1) AU638386B2 (de)
CA (1) CA2032913A1 (de)
DE (1) DE69014575D1 (de)
FI (1) FI906364A (de)
FR (1) FR2656447B1 (de)

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Also Published As

Publication number Publication date
FI906364A0 (fi) 1990-12-21
JPH04128676A (ja) 1992-04-30
FR2656447A1 (fr) 1991-06-28
CA2032913A1 (en) 1991-06-27
ATE114843T1 (de) 1994-12-15
AU638386B2 (en) 1993-06-24
FI906364A (fi) 1991-06-27
US5140307A (en) 1992-08-18
AU6840890A (en) 1991-07-04
FR2656447B1 (fr) 1992-03-27
EP0435055A1 (de) 1991-07-03
DE69014575D1 (de) 1995-01-12

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