WO1987003404A1 - Device for the remote surveyance of the presence, in a near aera, of a moving object, an animal or a human being - Google Patents

Device for the remote surveyance of the presence, in a near aera, of a moving object, an animal or a human being Download PDF

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Publication number
WO1987003404A1
WO1987003404A1 PCT/FR1986/000407 FR8600407W WO8703404A1 WO 1987003404 A1 WO1987003404 A1 WO 1987003404A1 FR 8600407 W FR8600407 W FR 8600407W WO 8703404 A1 WO8703404 A1 WO 8703404A1
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WO
WIPO (PCT)
Prior art keywords
transmitter
decoder
signal
output
receiver
Prior art date
Application number
PCT/FR1986/000407
Other languages
French (fr)
Inventor
Guy Royoux
Original Assignee
Guy Royoux
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Guy Royoux filed Critical Guy Royoux
Publication of WO1987003404A1 publication Critical patent/WO1987003404A1/en
Priority to NO872958A priority Critical patent/NO872958L/en
Priority to DK374687A priority patent/DK374687D0/en
Priority to FI873219A priority patent/FI873219A/en
Priority to KR870700638A priority patent/KR880700978A/en

Links

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
    • G08B21/02—Alarms for ensuring the safety of persons
    • G08B21/0202—Child monitoring systems using a transmitter-receiver system carried by the parent and the child
    • G08B21/0294—Display details on parent unit
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
    • G08B21/02—Alarms for ensuring the safety of persons
    • G08B21/0202—Child monitoring systems using a transmitter-receiver system carried by the parent and the child
    • G08B21/0241—Data exchange details, e.g. data protocol
    • G08B21/0247—System arrangements wherein the alarm criteria uses signal strength
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
    • G08B21/18—Status alarms
    • G08B21/24—Reminder alarms, e.g. anti-loss alarms

Definitions

  • the present invention relates to a device for remote monitoring of the presence, in an area near a moving object, an animal or a human being.
  • One of these devices which is described in patent US-A-4 528 566, comprises a transmitter carried by the person or animal to be monitored, this transmitter comprising an HF oscillator whose carrier is cut to the rhythm of a coded signal uniquely identifying the carrier of the transmitter.
  • the Hf signal thus produced is applied to a transmitting antenna to be picked up remotely by a receiving antenna system connected to a goniometric receiver.
  • the antenna system comprises, on the one hand, a whip antenna directly connected to the input of an HF amplifier and, on the other hand, an antenna in a half-wave resonant loop, orientable around a vertical axis for the azimuth scanning, which is also connected to the input of the HF amplifier by means of a half-wave delay line.
  • the receiver also includes a mixer receiving the amplified RF signal and the output signal from a local oscillator, and a low frequency amplifier supplying a loudspeaker.
  • Such a known device has several drawbacks which make it very easy to use. In fact i is relatively heavy and bulky, it requires that its box be placed in a vertical position so that the antenna and the rotating loop can carry out its azimuth scanning. It only allows an approximate location to be made by sound. of the bearer of the notam issuer without making it possible to appreciate the distance at which it is. Furthermore, it does not make it possible to carry out a clear discrimination between the signals transmitted by several carriers located in the monitored area because all the HF signals produced simultaneously by the respective transmitters of the various carriers, with the same carrier , could be received simultaneously by the receiver, being superimposed and no longer generating, therefore, an easily recognizable low frequency signal.
  • the present invention aims to solve this problem of surveillance by very convenient means of use which make it possible to easily locate a mobile object, an animal or a determined human being among a set of these and to locate the direction with precision. which is then the object, animal or human being monitored, among others, as well as its distance.
  • a remote monitoring device for a mobile object, an animal or a human being, comprising, on the object, the animal or human being monitored, a transmitter portable comprising an HF oscillator, means for cutting the HF carrier output from the oscillator into a train of amplitude modulated signals forming a coded signal identifying the carrier of the transmitter, and an antenna transmitting the coded signal , and a remote receiver housed in a portable box and comprising a receiving antenna for picking up the coded signal received from the transmitter and means for producing a signal making it possible to identify the direction in which the wearer of the transmitter, is characterized in that the receiver comprises only a whip antenna which can be swiveled manually in all directions and the receiver circuit includes a decoder at the input of which the received coded signal is applied, hubs ns producing an audible signal connected to the decoder output so as to be put into service only when the coded signal received is recognized as being valid by the decoder and means producing a: variable light signal connected to the
  • FIG. 1 is a diagram illustrating the principle of a remote monitoring device according to the invention.
  • Figure 2 is a block diagram of the monitoring device.
  • Figure 3 is an electrical diagram of an embodiment of the transmitter.
  • Figure 4 is an electrical diagram of an embodiment of the receiver.
  • the monitoring device comprises a transmitter assembly 1 carried by a mobile object, a human being or an animal, and a goniometric receiver located at a distance from the previous one.
  • the transmitter 1 can be worn in any suitable way, for example by being housed in a collar 3 worn by the animal, or in a bracelet.
  • the transmitter 1 comprises an antenna 4 transmitting a coded signal identifying the object, the person or the animal carrying the transmitter.
  • This coded signal consists of a VHF signal, for example of frequency 72 MHz, amplitude modulated by a digital coding signal, this coded signal characterizing the carrier of the transmitter 1.
  • the goniometric receiver is contained in a casing 2 of molded plastic, having a shape which can be easily held by hand.
  • This receiver comprises a single "whip" antenna 5 making it possible to receive the signal coming from the transmitter 1.
  • the receiver makes it possible, from the strength of the received signal, to locate the direction and the distance of the carrier from the transmitter 1 ,
  • the transmitter 1 comprises a VHF oscillator 6 transmitting a VHF carrier at a frequency of 72 MHz for example. This signal can be broken from time to time, in order to increase the autonomy of feeding.
  • the output of the oscillator 6 is connected to a final amplifier stage 7, the output of which is connected to the transmitting antenna 4.
  • the transmitter 1 contains a sequencer circuit 8 connected to an encoder 9.
  • the sequencer 8 applies to the encoder 9 a niche signal consisting of alternating rectangular voltage pulses of duration of 7 seconds each, for example, which are separated by intervals, also of 7 seconds, in which the voltage is zero.
  • the encoder 9 delivers at its output a word of several bits I, for example nine bits, which identi fi es in a unique way the carrier of the transmitter 1.
  • This identification signal I is applied to the stage final amplifier 7.
  • This transmitter comprises a stabilized power supply 10 which is connected by a switch 11 to the two poles of a battery 12.
  • This stabilized power supply supplies all the components of the transmitter with a DC voltage of + 5V. Consequently, as soon as the interrupter 11 is closed, the sequencer 8 is put into service, its operating period being determined by a resistor bridge 13, 14 and the associated capacitor 15.
  • the VHF oscillator 6 is of the quartz type 17 and it comprises a transistor 18.
  • the collector of this transistor 18 is connected to the base of another transistor 19 constituting an intermediate amplifier stage and the emitter of this the last transistor is in turn connected to the base of a transistor 21 forming part of the final amplifier stage 7.
  • the emitters of the two transistors 19 and 21 are connected to the reader of a. transistor 22 whose base is connected to the output of the encoder 9.
  • a filter network 22 guaranteeing the purity of the signal transmitted.
  • the goniometric receiver comprises, inside the box 2 (FIG. 2), an HF amplifier 24 at the input of which the signals picked up by the antenna 5 are applied, and whose output is connected to an input of a mixer 25. Another input of this mixer is connected to a local oscillator 26 whose frequency is slightly different from that of the carrier of the signal emitted by the transmitter 1. This frequency of the local oscillator can be for example 71.545 MHz.
  • the output signal from the mixer 25 is applied to a low frequency amplifier 27, the output of which is connected to a decoder 28.
  • the receiver also includes an amplifier 29, the input of which is connected to an output of the mixer 25, and a sequencer 31 whose input is connected to the output of the decoder 28.
  • the amplifier 29 and the sequencer 31 are connected to a field indicator 32 while another output of the sequencer 31 is connected to a circuit 33 for controlling a buzzer or buzzer 30.
  • the field indicator 32 is a drive circuit of seven light-emitting diodes (LED) 37,38,39,40,41,42,43 which appear on one face of the case 2, as can see it in FIG. 1.
  • LED light-emitting diodes
  • Preferably these light-emitting diodes are distributed at an angle, the two red diodes 37.38 being the most spaced apart being followed by two yellow diodes 39.40 and then two green diodes 41.42, the last green diode 43 was nt located at the top of the angle.
  • All the components of the receiver are connected to a stabilized power supply 34 which is connected to a battery 35 by a start switch 36 and which delivers at its output a DC voltage of + 5V for the supply of the various circuits.
  • the various circuits of the receiver 2 appear on the detailed electrical diagram of FIG. 4 which corresponds to a non-limiting embodiment.
  • the operation of the receiver 2 is as follows: as soon as the inverter 36 is closed, all the circuits are energized, which is indicated by the lighting of the two red light-emitting diodes 37.38 connected to the output "8" of the field indicator 32 which is of the type 237 BG.
  • the local oscillator 26 is also put into operation and as soon as a 72MHz frequency signal appears on the antenna 5, all of the mixer circuits and intermediate frequency ensures the shaping of the low frequency modulation.
  • This modulated signal is applied, after being amplified by the low frequency amplifier 27, to the input of the decoder 28 which may be of the MC145028 type from the company MOTOROLA. Two cases are then possible:
  • the modulated signal comprises a code different from the predetermined one on which the decoder 28 has been set.
  • This decoder 28 then remains inert and the field indicator 32 remains at zero because it is then short-circuited by a transistor 44 connected to an output of the decoder 28, although this field indicator receives the output signal from the mixer 25, after amplification by the amplifier 29 (of the LM 358 type).
  • the buzzer 30 is not excited, no sound signal is emitted, and only the lighting of the two red light-emitting diodes 37,38 indicates that the device is in service, but without having however located the holder of the transmitter 1.
  • the modulated signal applied to the input of the decoder 28 includes a code corresponding to that which has been predefined.
  • the decoder 28 changes state at its output and it releases the sequencer 31.
  • This sequencer 31 emits, at its output which is connected to the circuit 33 for controlling the buz ⁇ zer 30, a periodic signal so that every 200 milliseconds, for example, the buzzer 30 is activated.
  • the transistor 44 is blocked so that the field indicator 32 is no longer short-circuited. This field indicator can then process the analog signal present at its input and which comes from the mixer 25, through the amplifier 29.
  • This field indicator commands the selective lighting of the light-emitting diodes 39 to 43 to allow to locate, from the lighting of these diodes, the direction in which the carrier of the transmitter is and its distance. If all the diodes 39 to 43 are on and the buzzer 30 is working, this means that the antenna 5 is oriented in the right direction and that the transmitter 1 is very close. If the green diode 43 at the top of the angle is only extinguished and the buzzer works, the orientation direction of the antenna 5 is fairly good but the transmitter is distant at around 200-400 meters.
  • the modulated signal received includes a valid code and it is possible to find the direction of the transmitter 1, by moving the antenna 5, based on the lighting of diodes 39-43.
  • a receiver assuring the permanent communication between the mobile (transmitter) and the monitoring receiver.
  • This radio link then allows the automatic triggering of the transmitter 1 according to a programmed perimeter, and the determination of the distance and the direction separating the two elements, this various information being indicated in clear on the receiver. monitoring.
  • this transmitter can be provided with a direct call button, by momentary action, while the receiver is then in permanent standby. The action on the call button triggers the receiver, the transmitter 1 taking his configura ⁇ tion of r sequenced emissions and the search procedure remains the same as before.
  • the device according to the invention has been described in a particular application for monitoring a living being, it goes without saying that it can be used for any other purpose, in particular for monitoring any mobile object. that can be stolen. It can be used in particular for remote monitoring of vehicles such as trucks, motorcycles, etc. or even of boats, in ports, to prevent theft of these.

Abstract

A device for the remote surveyance of a moving object, an animal or a human being comprises, on the object, the animal or the human being monitored, a portable transmitter (1) including an RF oscillator (6) and means (8, 9) for chopping the output RF carrier from the oscillator (6) into a train of amplitude modulated signals forming a coded signal of identification of the transmitter holder, and also comprises a remote receiver housed into a portable casing (2). In order to facilitate the localization of the transmitter holder or carrier, the receiver comprises only a whip antenna (5) which is manually orientable in all directions and the receiver circuit comprises a decoder (28) at the input of which is applied the received coded signal, means (30, 31, 33) producing a sound signal are connected at the output of the decoder and means (32, 39-43) producing a variable light signal are connected to the output of the decoder (28) to give a visual indication varying as a function of the direction and the distance of the transmitter (1).

Description

" DISPOSITIF DE SURVEILLANCE A DISTANCE DE LA PRESENCE, DANS UNE ZONE PROCHE, D'UN OBJET MOBILE, D'UN ANIMAL OU D'UN ETRE HUMAIN ".-"DEVICE FOR REMOTE MONITORING OF THE PRESENCE, IN A NEAR ZONE, OF A MOBILE OBJECT, AN ANIMAL OR A HUMAN BEING" .-
La présente invention concerne un dispositif de surveillance à distance de la présence, dans une zone pro¬ che, d'un objet mobile, d'un animal ou d'un être humain.The present invention relates to a device for remote monitoring of the presence, in an area near a moving object, an animal or a human being.
On sait que les animaux domestiques ont tendance, assez souvent, à faire des fugues, assez loin du lieu de leur séjour habituel. Il en résulte, pour les propriétaires de ces animaux, des recherches assez longues, et souvent infructueuses.We know that domestic animals tend to run away quite often, far enough from their usual place of stay. This results in fairly long and often fruitless searches for the owners of these animals.
Par ailleurs le même problème se pose en ce qui concerne la surveillance d'enfants susceptibles de faire l'objet d'enlèvements, ou encore de véhicules susceptibles d'être volés.In addition, the same problem arises with regard to the surveillance of children liable to be abducted, or of vehicles liable to be stolen.
On connaît déjà des dispositifs assurant une telle surveillance à distance. L'un de ces dispositifs qui est décrit dans le brevet US-A-4 528 566, comprend un émetteur porté par la personne ou l'animal à surveiller, cet émetteur comprenant un oscillateur HF dont la porteuse est découpé au rythme d'un signal codé identifiant d'une manière uniqu le porteur de l'émetteur. Le signal Hf ainsi produit es appliqué à une antenne émettrice pour être capté à distanc par un système d'antenne réceptrice relié à un récepteu goniométrique. Dans cet appareil connu le système d'antenn comprend, d'une part, une antenne fouet reliée directemen à l'entrée d'un amplificateur HF et, d'autre part, un antenne en boucle résonante demi-onde, orientable autou d'un axe vertical pour le balayage en azimut, laquelle es également reliée à l'entrée de l'amplificateur HF par l'in termédiaire d'une ligne à retard demi-onde. Le récepteu comporte également un mélangeur recevant le signal HF ampli fié et le signal de sortie d'un oscillateur local, et u amplificateur basse fréquence alimentant un haut-parleur.Devices are already known providing such remote monitoring. One of these devices, which is described in patent US-A-4 528 566, comprises a transmitter carried by the person or animal to be monitored, this transmitter comprising an HF oscillator whose carrier is cut to the rhythm of a coded signal uniquely identifying the carrier of the transmitter. The Hf signal thus produced is applied to a transmitting antenna to be picked up remotely by a receiving antenna system connected to a goniometric receiver. In this known device, the antenna system comprises, on the one hand, a whip antenna directly connected to the input of an HF amplifier and, on the other hand, an antenna in a half-wave resonant loop, orientable around a vertical axis for the azimuth scanning, which is also connected to the input of the HF amplifier by means of a half-wave delay line. The receiver also includes a mixer receiving the amplified RF signal and the output signal from a local oscillator, and a low frequency amplifier supplying a loudspeaker.
Un tel appareil connu présente plusieurs inconvé nients qui le rendent peut commode à l'emploi. En effet i est relativement lourd et encombrant, il exige que son boî tier soit placé en position verticale pour que l'antenne e boucle rotative puisse effectuer son balayage en azimut e il ne permet d'effectuer qu'une localisation approximativ uniquement par voie sonore du porteur de l'émetteur notam ment sans permettre d'apprécier la distance à laquelle il se trouve. Par ailleurs il ne permet pas d'effectuer une dis¬ crimination nette entre les signaux émis par plusieurs por¬ teurs se trouvant dans la zone surveillée du fait que tous les signaux HF produits simultanément par les émetteurs respectifs des divers porteurs, avec une même porteuse, pourraient être captés simultanément par le récepteur, en étant superposés et en n'engendrant plus, de ce fait, un signal basse fréquence aisément reconnaissable. La présente invention vise à résoudre ce problème de la surveillance par des moyens très commmodes d'emploi qui permettent de repérer aisément un objet mobile, un animal ou un être humain déterminé parmi un ensemble de ceux-ci et de localiser avec précision la direction dans laquelle se trouve alors l'objet, l'animal ou l'être humain surveillé, parmi d'autres, ainsi que sa distance.Such a known device has several drawbacks which make it very easy to use. In fact i is relatively heavy and bulky, it requires that its box be placed in a vertical position so that the antenna and the rotating loop can carry out its azimuth scanning. It only allows an approximate location to be made by sound. of the bearer of the notam issuer without making it possible to appreciate the distance at which it is. Furthermore, it does not make it possible to carry out a clear discrimination between the signals transmitted by several carriers located in the monitored area because all the HF signals produced simultaneously by the respective transmitters of the various carriers, with the same carrier , could be received simultaneously by the receiver, being superimposed and no longer generating, therefore, an easily recognizable low frequency signal. The present invention aims to solve this problem of surveillance by very convenient means of use which make it possible to easily locate a mobile object, an animal or a determined human being among a set of these and to locate the direction with precision. which is then the object, animal or human being monitored, among others, as well as its distance.
A cet effet ce, dispositif de surveillance à dis¬ tance d'un objet mobile, d'un animal ou d'un être humain, comprenant, sur l'objet, l'animal ou l'être humain surveil- lé, un émetteur portatif comprenant un oscillateur HF , des moyens pour découper la porteuse HF de sortie de l'oscilla¬ teur en un train de signaux modulés en amplitude formant un signal codé d' identification du porteur de l'émetteur, et une antenne émettrice du signal codé, et un récepteur à distance logé dans un boîtier portatif et comportant une antenne réceptrice pour capter le signal codé reçu en pro¬ venance de l'émetteur et des moyens pour produire un signal permettant de repérer la direction dans laquelle se trouve le porteur de l'émetteur, est caractérisé en ce que le ré- cepteur comporte uniquement une antenne fouet orientable -manuellement dans toutes les directions et le circuit du récepteur comporte un décodeur à l'entrée duquel est appli¬ qué le signal codé reçu, des moyens produisant un signal sonore connectés à la sortie du décodeur de manière à être mis en service uniquement lorsque le signal codé reçu est reconnu comme étant valide par le décodeur et des moyens produisant un: signal lumineux variable reliés à la sortie du décodeur pour donner une indication visuelle variable en fonction de la direction et la distance de l'émetteur.To this end, a remote monitoring device for a mobile object, an animal or a human being, comprising, on the object, the animal or human being monitored, a transmitter portable comprising an HF oscillator, means for cutting the HF carrier output from the oscillator into a train of amplitude modulated signals forming a coded signal identifying the carrier of the transmitter, and an antenna transmitting the coded signal , and a remote receiver housed in a portable box and comprising a receiving antenna for picking up the coded signal received from the transmitter and means for producing a signal making it possible to identify the direction in which the wearer of the transmitter, is characterized in that the receiver comprises only a whip antenna which can be swiveled manually in all directions and the receiver circuit includes a decoder at the input of which the received coded signal is applied, hubs ns producing an audible signal connected to the decoder output so as to be put into service only when the coded signal received is recognized as being valid by the decoder and means producing a: variable light signal connected to the decoder output to give a variable visual indication depending on the direction and distance from the transmitter.
On décrira ci-après,à titre d'exemple non limitatif, une forme d'exécution de la présente invention,en référence au dessin annexé sur lequel :An embodiment of the present invention will be described below, by way of non-limiting example, with reference to the appended drawing in which:
La figure 1 est un schéma illustrant le principe d'un dispositif de surveillance à distance suivant l'inven¬ tion. La figure 2 est un schéma synoptique du dispositif de- surveillance.Figure 1 is a diagram illustrating the principle of a remote monitoring device according to the invention. Figure 2 is a block diagram of the monitoring device.
La figure 3 est un schéma électrique d'une forme d'exécution de l'émetteur.Figure 3 is an electrical diagram of an embodiment of the transmitter.
La figure 4 est un schéma électrique d'une forme d'exécution du récepteur.Figure 4 is an electrical diagram of an embodiment of the receiver.
Le dispositif de surveillance suivant l'invention dont le principe est illustré par la figure 1, comprend un ensemble émetteur 1 porté par un objet mobile, un être hu¬ main ou un animal, et un récepteur goniom trique situé à distance du précédent. L'émetteur 1 peut être porté de toute façon appropriée, par exemple en étant logé dans un collier 3 porté par .1 ' animal , ou dans un bracelet. L'émetteur 1 comporte une antenne 4 émettant un signal codé identifiant l'objet, la personne ou l'animal portant l'émetteur. Ce si- gnal codé est constitué par un signal VHF, par exemple de fréquence 72MHz, modulé en amplitude par un signal de co¬ dage numérique, ce signal codé caractérisant le porteur de l'émetteur 1.The monitoring device according to the invention, the principle of which is illustrated in FIG. 1, comprises a transmitter assembly 1 carried by a mobile object, a human being or an animal, and a goniometric receiver located at a distance from the previous one. The transmitter 1 can be worn in any suitable way, for example by being housed in a collar 3 worn by the animal, or in a bracelet. The transmitter 1 comprises an antenna 4 transmitting a coded signal identifying the object, the person or the animal carrying the transmitter. This coded signal consists of a VHF signal, for example of frequency 72 MHz, amplitude modulated by a digital coding signal, this coded signal characterizing the carrier of the transmitter 1.
Le récepteur goniomé trique est contenu dans un boîtier 2 en matière plastique moulée, ayant une forme pouvant être aisément tenue à la main. Ce récepteur comporte une seule antenne "fouet" 5 permettant de capter le signal provenant de l'émetteur 1. Le récepteur permet, à partir de l'intensité du signal reçu, de repérer la direction et la distance du porteur de l'émetteur 1,The goniometric receiver is contained in a casing 2 of molded plastic, having a shape which can be easily held by hand. This receiver comprises a single "whip" antenna 5 making it possible to receive the signal coming from the transmitter 1. The receiver makes it possible, from the strength of the received signal, to locate the direction and the distance of the carrier from the transmitter 1 ,
Comme on peut le voir sur la figure 2, l'émetteur 1 comporte un oscillateur VHF 6 émettant une porteuse VHF à une fréquence de 72MHz par exemple. Ce signal peut être in- terrompu de temps en temps, afin d'augmenter l'autonomie d'alimentation. La sortie de 1oscillateur 6 est reliée à un étage amplificateur final 7 dont la sortie est connectée à l'antenne émettrice 4. Par ailleurs l'émetteur 1 contient un circuit séquenceur 8 connecté à un encodeur 9. Le séquen- ceur 8 applique à l'encodeur 9 un signal créneau constitué par une alternance d'impulsions de tension rectangulaires d'une durée de 7 secondes chacune, par exemple, et qui sont séparées par des intervalles, également de 7 secondes, dans lesquels la tension est nulle. L'encodeur 9 délivre à sa sortie un mot de plusieurs bits I, par exemple à neuf bits, qui ide'ntifie d'une manière unique le porteur de l'émetteur 1. Ce signal d' identification I est appliqué à l'étage am¬ plificateur final 7. Si on se réfère à la figure 3, on voit que cette figure représente le schéma électrique d'une forme d'exécu¬ tion de l'émetteur. Cet émetteur comprend une alimentation stabilisée 10 qui est reliée par un interrupteur 11, aux deux pôles d'une batterie 12. Cette alimentation stabilisée alimente tous les composants de l'émetteur sous une tension continue de +5V. Par conséquent, dès la fermeture de l'in¬ terrupteur 11, le séquenceur 8 est mis en service, sa pé¬ riode de fonctionnement étant déterminée par un pont de ré¬ sistances 13,14 et le condensateur 15 associés. Par ail- leurs l'oscillateur VHF 6 est du type à quartz 17 et il comprend un transistor 18. Le collecteur de ce transistor 18 est relié à la base d'un autre transistor 19 constituant un étage amplificateur intermédiaire et l'émetteur de ce der¬ nier transistor est à son tour- relié à la base d'un transis- tor 21 faisant partie de l'étage amplificateur final 7. Les émetteurs des deux transistors 19 et 21 sont reliés au col¬ lecteur d' un .transistor 22 dont la base est connectée à la sortie de l'encodeur 9. Entre l'antenne 4 et le transistor 21 de l'étage amplificateur final est interposé un réseau de filtrage 22 garantissant la pureté du signal émis.As can be seen in FIG. 2, the transmitter 1 comprises a VHF oscillator 6 transmitting a VHF carrier at a frequency of 72 MHz for example. This signal can be broken from time to time, in order to increase the autonomy of feeding. The output of the oscillator 6 is connected to a final amplifier stage 7, the output of which is connected to the transmitting antenna 4. Furthermore, the transmitter 1 contains a sequencer circuit 8 connected to an encoder 9. The sequencer 8 applies to the encoder 9 a niche signal consisting of alternating rectangular voltage pulses of duration of 7 seconds each, for example, which are separated by intervals, also of 7 seconds, in which the voltage is zero. The encoder 9 delivers at its output a word of several bits I, for example nine bits, which identi fi es in a unique way the carrier of the transmitter 1. This identification signal I is applied to the stage final amplifier 7. If we refer to Figure 3, we see that this figure shows the electrical diagram of a form of execution of the transmitter. This transmitter comprises a stabilized power supply 10 which is connected by a switch 11 to the two poles of a battery 12. This stabilized power supply supplies all the components of the transmitter with a DC voltage of + 5V. Consequently, as soon as the interrupter 11 is closed, the sequencer 8 is put into service, its operating period being determined by a resistor bridge 13, 14 and the associated capacitor 15. Furthermore, the VHF oscillator 6 is of the quartz type 17 and it comprises a transistor 18. The collector of this transistor 18 is connected to the base of another transistor 19 constituting an intermediate amplifier stage and the emitter of this the last transistor is in turn connected to the base of a transistor 21 forming part of the final amplifier stage 7. The emitters of the two transistors 19 and 21 are connected to the reader of a. transistor 22 whose base is connected to the output of the encoder 9. Between the antenna 4 and the transistor 21 of the final amplifier stage is interposed a filter network 22 guaranteeing the purity of the signal transmitted.
Le récepteur goniométrique comporte, à l'intérieur du boîtier 2 (figure 2) , un amplificateur HF 24 à l'entrée duquel sont appliqués les signaux captés par l'antenne 5, et dont la sortie est reliée à une entrée d'un mélangeur 25. Une autre entrée de ce mélangeur est connectée à un oscil¬ lateur local 26 dont la fréquence est légèrement différente de celle de la porteuse du signal émis par l'émetteur 1. Cette fréquence de l'oscillateur local peut être par exemple de 71,545MHz. Le signal de sortie du mélangeur 25 est ap¬ pliqué à un amplificateur basse fréquence 27 dont la sortie est reliée à un décodeur 28. Le récepteur comporte par ailleurs un amplificateur 29 dont l'entrée est reliée à une sortie du mélangeur 25, et un séquenceur 31 dont l'entrée est reliée à la sortie du décodeur 28. L'amplificateur 29 et le séquenceur 31 sont connectés à un indicateur de champ 32 tandis qu'une autre sortie du séquenceur 31 est reliée à un circuit 33 de commande d'un avertisseur sonore ou buzzer 30. L'indicateur de champ 32 est un circuit d'attaque de sept diodes électroluminescentes (LED) 37,38,39,40,41,42,43 qui apparaissent sur une face du boîtier 2, comme on peut le voir sur la figure 1. De préférence ces diodes électrolumi¬ nescentes sont réparties en formant un angle, les deux dio- des rouges 37,38 étant les plus écartées en étant suivies de deux diodes jaunes 39,40 puis de deux diodes vertes 41,42, la dernière diode verte 43 étant située au sommet de l'an¬ gle. Tous les composants du récepteur sont connectés à une alimentation stabilisée 34 qui est reliée à une batterie 35 par un interrupteur de mise en marche 36 et qui délivre à sa sortie une tension continue de +5V pour l'alimentation des divers circuits.The goniometric receiver comprises, inside the box 2 (FIG. 2), an HF amplifier 24 at the input of which the signals picked up by the antenna 5 are applied, and whose output is connected to an input of a mixer 25. Another input of this mixer is connected to a local oscillator 26 whose frequency is slightly different from that of the carrier of the signal emitted by the transmitter 1. This frequency of the local oscillator can be for example 71.545 MHz. The output signal from the mixer 25 is applied to a low frequency amplifier 27, the output of which is connected to a decoder 28. The receiver also includes an amplifier 29, the input of which is connected to an output of the mixer 25, and a sequencer 31 whose input is connected to the output of the decoder 28. The amplifier 29 and the sequencer 31 are connected to a field indicator 32 while another output of the sequencer 31 is connected to a circuit 33 for controlling a buzzer or buzzer 30. The field indicator 32 is a drive circuit of seven light-emitting diodes (LED) 37,38,39,40,41,42,43 which appear on one face of the case 2, as can see it in FIG. 1. Preferably these light-emitting diodes are distributed at an angle, the two red diodes 37.38 being the most spaced apart being followed by two yellow diodes 39.40 and then two green diodes 41.42, the last green diode 43 was nt located at the top of the angle. All the components of the receiver are connected to a stabilized power supply 34 which is connected to a battery 35 by a start switch 36 and which delivers at its output a DC voltage of + 5V for the supply of the various circuits.
Les divers circuits du récepteur 2 apparaissent sur le schéma électrique détaillé de la figure 4 qui correspond à une forme d'exécution non limitative.The various circuits of the receiver 2 appear on the detailed electrical diagram of FIG. 4 which corresponds to a non-limiting embodiment.
Le fonctionnement du récepteur 2 est le suivant : dès la fermeture de l' in errupteur 36, tous les circuits sont sous tension, ce qui est indiqué par l'allumage des deux diodes électroluminescentes rouges 37,38 connectées à ~ la sortie "8" de l'indicateur de champ 32 qui est du type 237 BG. L'oscillateur local 26 est également mis en fonc¬ tionnement et dès l'apparition d'un signal de fréquence 72MHz sur l'antenne 5, l'ensemble des circuits du mélangeur et fréquence intermédiaire assure la mise en forme de la modulation basse fréquence. Ce signal modulé est appliqué, après avoir été amplifié par l'amplificateur basse fréquence 27, à l'entrée du décodeur 28 qui peut être du type MC145028 de la Société MOTOROLA. Deux cas sont alors possi¬ bles :The operation of the receiver 2 is as follows: as soon as the inverter 36 is closed, all the circuits are energized, which is indicated by the lighting of the two red light-emitting diodes 37.38 connected to the output "8" of the field indicator 32 which is of the type 237 BG. The local oscillator 26 is also put into operation and as soon as a 72MHz frequency signal appears on the antenna 5, all of the mixer circuits and intermediate frequency ensures the shaping of the low frequency modulation. This modulated signal is applied, after being amplified by the low frequency amplifier 27, to the input of the decoder 28 which may be of the MC145028 type from the company MOTOROLA. Two cases are then possible:
1) Le signal modulé comporte un code différent de celui prédéterminé sur lequel a été réglé le décodeur 28. Ce décodeur 28 reste alors inerte et l'indicateur de champ 32 reste à zéro car il est alors mis en court-circuit par un transistor 44 relié à une sortie du décodeur 28, bien que cet indicateur de champ reçoive le signal de sortie du mé¬ langeur 25, après amplification par l'amplificateur 29 (du type LM 358). Dans ce cas le buzzer 30 n'est pas excité, aucun signal sonore n'est émis, et seul l'allumage des deux diodes électroluminescentes rouges 37,38 indique que l'appa¬ reil est en service, mais sans avoir toutefois localisé le porteur de l'émetteur 1.1) The modulated signal comprises a code different from the predetermined one on which the decoder 28 has been set. This decoder 28 then remains inert and the field indicator 32 remains at zero because it is then short-circuited by a transistor 44 connected to an output of the decoder 28, although this field indicator receives the output signal from the mixer 25, after amplification by the amplifier 29 (of the LM 358 type). In this case the buzzer 30 is not excited, no sound signal is emitted, and only the lighting of the two red light-emitting diodes 37,38 indicates that the device is in service, but without having however located the holder of the transmitter 1.
2) Le signal modulé appliqué à l'entrée du décodeur 28 comporte un code correspondant à celui qui a é é prédé¬ terminé. Dans ce cas le décodeur 28 change d'état à sa sor¬ tie et il libère le séquenceur 31. Ce séquenceur 31 émet, à sa sortie qui est reliée au circuit 33 de commande du buz¬ zer 30, un signal périodique si bien que toutes les 200 millisecondes, par exemple, le buzzer 30 est mis en servi¬ ce. Par ailleurs le transistor 44 est bloqué si bien que l'indicateur de champ 32 n'est plus mis en court-circuit. Cet indicateur de champ peut traiter alors le signal analo¬ gique présent à son entrée et qui provient du mélangeur 25, à travers l'amplificateur 29. Cet indicateur de champ com¬ mande l'allumage sélectif des diodes électroluminescentes 39.à 43 pour permettre de repérer, à partir de l'allumage de ces diodes, la direction dans laquelle se trouve le porteur de l'émetteur et sa distance. Si toutes les diodes 39 à 43 sont allumées et le buzzer 30 fonctionne, ceci veut dire que l'antenne 5 est orientée dans la bonne direction et que l'émetteur 1 est très proche. Si la diode verte 43 du sommet de l'angle est seule éteinte et le buzzer fonctionne, la direction d'orientation de l'antenne 5 est assez bonne mais l'émetteur est éloigné à environ 200-400 mètres. Lors¬ que les trois diodes vertes 41,42,43, sont éteintes, les diodes jaunes 39,40 étant allumées, et le buzzer fonction- ne, ceci signifie que la direction de l'antenne 5 est assez bonne mais que l'émetteur se trouve à une distance comprise entre 500 et 1000 mètres. L'allumage sélectif des diodes électroluminescentes 39-43 est ainsi fonction de l'amplitude du signal appliqué à l'entrée de l'indicateur de champ 32, lequel n'est toujours rendu actif que si le signal codé reçu est reconnu valide par le décodeur 28. û_2) The modulated signal applied to the input of the decoder 28 includes a code corresponding to that which has been predefined. In this case the decoder 28 changes state at its output and it releases the sequencer 31. This sequencer 31 emits, at its output which is connected to the circuit 33 for controlling the buz¬ zer 30, a periodic signal so that every 200 milliseconds, for example, the buzzer 30 is activated. Furthermore, the transistor 44 is blocked so that the field indicator 32 is no longer short-circuited. This field indicator can then process the analog signal present at its input and which comes from the mixer 25, through the amplifier 29. This field indicator commands the selective lighting of the light-emitting diodes 39 to 43 to allow to locate, from the lighting of these diodes, the direction in which the carrier of the transmitter is and its distance. If all the diodes 39 to 43 are on and the buzzer 30 is working, this means that the antenna 5 is oriented in the right direction and that the transmitter 1 is very close. If the green diode 43 at the top of the angle is only extinguished and the buzzer works, the orientation direction of the antenna 5 is fairly good but the transmitter is distant at around 200-400 meters. When the three green diodes 41,42,43 are off, the yellow diodes 39,40 being lit, and the buzzer is working, this means that the direction of the antenna 5 is quite good but that the transmitter is at a distance between 500 and 1000 meters. The selective lighting of the light-emitting diodes 39-43 is thus a function of the amplitude of the signal applied to the input of the field indicator 32, which is always made active only if the coded signal received is recognized as valid by the decoder 28. û_
Si les diodes rouges 37 et 38 sont seules allumées et le buzzer 30 fonctionne, ceci signifie que le signal modulé reçu comporte un code valide et il est possible de rechercher la direction de l'émetteur 1, en déplaçant l'an¬ tenne 5, en se basant sur l'allumage des diodes 39-43.If the red diodes 37 and 38 are only lit and the buzzer 30 is working, this means that the modulated signal received includes a valid code and it is possible to find the direction of the transmitter 1, by moving the antenna 5, based on the lighting of diodes 39-43.
On peut naturellement envisager diverses variantes de réalisation du récepteur 2. Notamment on peut utiliser un seul circuit intégré regroupant l'amplificateur HF 24, le mélangeur 25, l'oscillateur local 26 et l' amplificateur basse fréquence 27.Naturally, it is possible to envisage various alternative embodiments of the receiver 2. In particular, it is possible to use a single integrated circuit grouping together the HF amplifier 24, the mixer 25, the local oscillator 26 and the low frequency amplifier 27.
On peut remplacer l'indicateur à diodes électrolumi¬ nescentes par un afficheur à cristaux liquides qui est plus précis et plus économique en consommation d'énergie. On peut intégrer dans un même circuit le décodeurIt is possible to replace the indicator with light-emitting diodes by a liquid crystal display which is more precise and more economical in energy consumption. The decoder can be integrated into the same circuit
28, le séquenceur 31, le contrôle de visualisation et les indications de routine (état des piles, cap à tenir etc...).28, the sequencer 31, the visualization control and the routine indications (state of the batteries, heading to be held etc ...).
On peut également envisager, suivant une variante d'exécution, d'adjoindre à l'émetteur 1 un récepteur assu- raπt la communication permanente entre le mobile (émetteur) et le récepteur de surveillance. Cette liaison radio permet alors le déclenchement automatique de l'émetteur 1 en fonc¬ tion d'un périmètre programmé, et la détermination de la distance et de la direction séparant les deux éléments, ces diverses informations étant indiquées en clair sur le ré¬ cepteur de surveillance. Dans le cas où l'émetteur 1 est porté par un être humain, cet émetteur peut être pourvu d'un bouton d'appel direct, par action momentanée, tandis que le récepteur est alors en veille permanente. L'action sur le bouton d'appel déclenche le récepteur, l'émetteur 1 prenant sa configura¬ tion drémissions séquencées et la procédure de recherche restant la même que précédemment.It is also possible, according to an alternative embodiment, to add to the transmitter 1 a receiver assuring the permanent communication between the mobile (transmitter) and the monitoring receiver. This radio link then allows the automatic triggering of the transmitter 1 according to a programmed perimeter, and the determination of the distance and the direction separating the two elements, this various information being indicated in clear on the receiver. monitoring. In the case where the transmitter 1 is carried by a human being, this transmitter can be provided with a direct call button, by momentary action, while the receiver is then in permanent standby. The action on the call button triggers the receiver, the transmitter 1 taking his configura¬ tion of r sequenced emissions and the search procedure remains the same as before.
Pour des utilisations plus collectives (dans le cas- de véliplanchistes ou du secours en montagne par exemple) et pour rendre plus efficace et. surtout plus rapide l'inter¬ vention possible, on peut prévoir la sélection d'un canal unique- ce qui correspond à deux mots distincts à l'émission et de la même façon à la discrimination dans le récepteur 2 de ces signaux. Bien que le dispositif suivant l'invention ait été décrit dans une application particulière à la surveillance d'un être vivant, il va de soi qu'il peut être employé à tout autre fin, notamment à la surveillance d'un, objet mobile quelconque pouvant être volé. Il peut être utilisé notamment pour la surveillance à distance de véhicules tels que camions, motocyclettes etc.. ou encore de bateaux, dans les ports, pour éviter le vol de ceux-ci. For more collective uses (in the case of windsurfers or mountain rescue for example) and to make it more efficient and. above all, faster intervention is possible, provision can be made for the selection of a single channel, which corresponds to two distinct words on transmission and, similarly, to discrimination in the receiver 2 of these signals. Although the device according to the invention has been described in a particular application for monitoring a living being, it goes without saying that it can be used for any other purpose, in particular for monitoring any mobile object. that can be stolen. It can be used in particular for remote monitoring of vehicles such as trucks, motorcycles, etc. or even of boats, in ports, to prevent theft of these.

Claims

REVENDICATIONS
1.- Dispositif de surveillance à distance d'un objet mobile, d'un animal ou d'un être humain, comprenant, sur l'objet, l'animal ou l'être humain surveillé, un émet¬ teur portatif (1) comprenant un oscillateur HF (6), des moyens (8,9) pour découper la porteuse HF de sortie de l'os¬ cillateur (6) en un train de signaux modulés en amplitude formant un signal codé d'identification du porteur de l'é- metteur, et une antenne émettrice (4) du signal codé, et un1.- Device for remote monitoring of a mobile object, an animal or a human being, comprising, on the object, the animal or human being monitored, a portable transmitter (1) comprising an HF oscillator (6), means (8, 9) for cutting the HF output carrier of the os¬ cillator (6) into a train of amplitude modulated signals forming an encoded signal identifying the carrier of the transmitter, and an antenna transmitting (4) the coded signal, and a
' récepteur à distance logé dans un boîtier portatif (2) et comportant une antenne réceptrice (5) pour capter le signal codé reçu en provenance de l'émetteur (1) et des moyens pour produire un signal permettant de repérer la direction dans laquelle se trouve le porteur de l'émetteur (1), carac¬ térisé en ce que le récepteur comporte uniquement une an¬ tenne fouet (5) orientable manuellement dans toutes les directions et le circuit du récepteur comporte un décodeur (28) à l'entrée duquel est appliqué le signal codé reçu, des moyens (30,31,33) produisant un signal sonore connectés à la sortie du décodeur (28) de manière à être mis en service uniquement lorsque le signal codé reçu est reconnu comme étant valide par le décodeur (28) et des moyens (32,39-43) produisant un signal lumineux variable reliés à la sortie du décodeur (28) pour donner une indication visuelle va¬ riable en fonction de la direction et la distance de l'émet¬ teur (1) .remote receiver housed in a portable box (2) and comprising a receiving antenna (5) for picking up the coded signal received from the transmitter (1) and means for producing a signal making it possible to identify the direction in which is finds the carrier of the transmitter (1), charac¬ terized in that the receiver only comprises a whip antenna (5) which can be manually oriented in all directions and the receiver circuit includes a decoder (28) at the input from which the received coded signal is applied, means (30,31,33) producing a sound signal connected to the output of the decoder (28) so as to be put into service only when the received coded signal is recognized as being valid by the decoder (28) and means (32, 39-43) producing a variable light signal connected to the output of the decoder (28) to give a variable visual indication as a function of the direction and the distance of the emitter (1).
2.- Dispositif suivant la revendication 1 caracté¬ risé e.n ce que la sortie du décodeur (28) est reliée à un séquenceur (31) connecté à un circuit (33) de commande d'un avertisseur sonore ou buzzer excité périodiquement.2.- Device according to claim 1 caracté¬ risé e.n that the output of the decoder (28) is connected to a sequencer (31) connected to a circuit (33) for controlling a sounder or buzzer excited periodically.
3.- Dispositif suivant l'une quelconque des reven¬ dications précédentes caractérisé en ce que le récepteur comporte un indicateur de champ (32) constitué par un cir- cuit d'attaque de diodes lectroluminescentes (37-43) de couleurs différentes dont l'allumage sélectif est fonction de l'amplitude du signal appliqué à l'entrée de l'indicateur de champ (32) qui est connectée, à travers un amplificateur (29), à une sortie d'un circuit mélangeur et fréquence in¬ termédiaire (25) qui est branché entre un amplificateur HF (24) et urv amplificateur basse fréquence (27) et qui est relié à un oscillateur local (26). 3.- Device according to any one of the preceding claims, characterized in that the receiver comprises a field indicator (32) constituted by a circuit for driving light-emitting diodes (37-43) of different colors including l selective ignition is a function of the amplitude of the signal applied to the input of the field indicator (32) which is connected, through an amplifier (29), at an output of a mixer and intermediate frequency circuit (25) which is connected between an HF amplifier (24) and a low frequency amplifier (27) and which is connected to a local oscillator (26).
4.- Dispositif suivant la revendication 3 caracté¬ risé en ce que l'indicateur de champ (32) est relié à un transistor interrupteur (44) connecté à la sortie du déco¬ deur (28) de manière à mettre en court-circuit et hors ser¬ vice l' indicateur de champ (32) lorsque le code du signal reçu n'est pas reconnu valide par le décodeur (28).4.- Device according to claim 3 caracté¬ ized in that the field indicator (32) is connected to a switch transistor (44) connected to the output of the decoder (28) so as to short-circuit and out of service the field indicator (32) when the code of the received signal is not recognized as valid by the decoder (28).
«5.- Dispositif suivant l'une quelconque des reven¬ dications 3 et 4 caractérisé en ce que les diodes électro¬ luminescentes (37-43) apparaissent sur une face du boîtier (2) et ces" diodes électroluminescentes sont réparties en formant un angle, deux diodes rouges (37,38) étant les plus écartées en étant suivies de deux diodes jaunes (39,40) puis de deux diodes vertes (41,42), la dernière diode verte (43) étant située au sommet de l'angle, toutes les diodes jaunes et vertes (39-43) étant allumées seulement lorsque l'antenne (5) est orientée dans la bonne direction et que lrémetteur (1) est très proche. "5.- Device according to any one of reven¬ dications 3 and 4 characterized in that the light-emitting diodes (37-43) appear on one face of the housing (2) and these " light-emitting diodes are distributed by forming a angle, two red diodes (37,38) being the most separated by being followed by two yellow diodes (39,40) then by two green diodes (41,42), the last green diode (43) being located at the top of the angle, all the yellow and green LEDs (39-43) being lit only when the antenna (5) is oriented in the right direction and the r transmitter (1) is very close.
PCT/FR1986/000407 1985-11-28 1986-11-28 Device for the remote surveyance of the presence, in a near aera, of a moving object, an animal or a human being WO1987003404A1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
NO872958A NO872958L (en) 1985-11-28 1987-07-15 DEVICE FOR REMOTE MONITORING OF THE PRESENCE, IN A CLOSE AREA, OF A MOVABLE ITEM, ANIMAL OR HUMAN.
DK374687A DK374687D0 (en) 1985-11-28 1987-07-17 APPLICATIONS FOR REMOTE MONITORING OF THE PRESENCE IN A NEARBY AREA OF A MOVABLE ITEM, ANIMAL OR HUMAN
FI873219A FI873219A (en) 1985-11-28 1987-07-22 ANORDNING FOER OEVERVAKNING PAO AVSTAOND AV NAERVARON I NAEROMRAODET AV ETT ROERLIGT OBJEKT, ETT DJUR ELLER EN MAENNISKA.
KR870700638A KR880700978A (en) 1985-11-28 1987-07-23 Remote monitoring device

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8517591A FR2590680B1 (en) 1985-11-28 1985-11-28 DEVICE FOR MONITORING THE PRESENCE, IN A NEAR ZONE, OF A MOBILE OBJECT, AN ANIMAL OR A HUMAN BEING
FR85/17591 1985-11-28

Publications (1)

Publication Number Publication Date
WO1987003404A1 true WO1987003404A1 (en) 1987-06-04

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PCT/FR1986/000407 WO1987003404A1 (en) 1985-11-28 1986-11-28 Device for the remote surveyance of the presence, in a near aera, of a moving object, an animal or a human being

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Country Link
EP (1) EP0230173B1 (en)
JP (1) JPS63501747A (en)
KR (1) KR880700978A (en)
AT (1) ATE61138T1 (en)
AU (1) AU6722887A (en)
DE (1) DE3677746D1 (en)
DK (1) DK374687D0 (en)
FI (1) FI873219A (en)
FR (1) FR2590680B1 (en)
NO (1) NO872958L (en)
OA (1) OA08685A (en)
WO (1) WO1987003404A1 (en)

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GB1586159A (en) * 1977-07-25 1981-03-18 Plessey Co Ltd Display arrangements
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US3336530A (en) * 1964-10-14 1967-08-15 Trak Microwave Corp Direction finding system for hunting dogs
US3366958A (en) * 1965-10-22 1968-01-30 Elizabeth M. Seaborn Proximity indicator
GB1586159A (en) * 1977-07-25 1981-03-18 Plessey Co Ltd Display arrangements
GB2071956A (en) * 1980-01-08 1981-09-23 Optomech Electronic Co Electronic alarm device
US4528566A (en) * 1982-08-13 1985-07-09 Tyler Michael D Transmitter and receiver locating device
FR2541021A1 (en) * 1983-02-14 1984-08-17 Lagade Alain Miniaturised functional device intended for signalling from any object being separated from the possessor

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WO1997039618A1 (en) * 1996-04-21 1997-10-30 Shoof International Limited Warning device
AU728201B2 (en) * 1996-04-21 2001-01-04 Shoof International Limited Warning device
US6512457B2 (en) 1999-11-15 2003-01-28 Hector Irizarry Monitoring device adapted for use with an electronic article surveillance system
GB2362978A (en) * 2000-06-02 2001-12-05 Janice Glover Location system
FR2871894A1 (en) * 2004-06-22 2005-12-23 Cryptiris Sarl Locating system for e.g. person suffering from Alzheimer`s disease, has badges transmitting unique code that permits locator to differentiate badges in same zone, where badges permit locator to pick up any badge present in range zone

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NO872958D0 (en) 1987-07-15
FR2590680A1 (en) 1987-05-29
KR880700978A (en) 1988-04-13
OA08685A (en) 1989-03-31
AU6722887A (en) 1987-07-01
DK374687A (en) 1987-07-17
FI873219A0 (en) 1987-07-22
FR2590680B1 (en) 1989-01-20
ATE61138T1 (en) 1991-03-15
NO872958L (en) 1987-07-15
JPS63501747A (en) 1988-07-14
DK374687D0 (en) 1987-07-17
DE3677746D1 (en) 1991-04-04
EP0230173A1 (en) 1987-07-29
FI873219A (en) 1987-07-22
EP0230173B1 (en) 1991-02-27

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