MXPA97000847A - Device and procedure for transmission of information through a guide system of ondasradia - Google Patents

Abstract

The present invention relates to an information transmission device for radiant waveguide system, which guides the waves along which a mobile moves, characterized in that the device comprises: means for injecting an unmodulated carrier wave into the radiant waveguide, point sampling means, along the waveguide, of a portion of the energy of the unmodulated carrier wave, modulation means for applying a local modulation signal to the unmodulated carrier wave representing the information destined to the mobile, and means to irradiate, to the destination of the mobile, the carrier wave modulates

Description

DEVICE AND PROCEDURE FOR TRANSMISSION OF INFORMATION USING A RADIANT WAVE GUIDE SYSTEM Description of the invention The present invention relates to devices and methods for transmitting information in general and relates more particularly to a device and a method for transmitting information by means of a system for guiding Radiant waves. The IAGO system, for information and automation by radiant waveguide, of the applicant is for example described in the document "THE USE OR RADIATING WAVEGUIDS IN GUIDED TRANSPORTATION SYSTEMS" of Marc HEDDERBAUT and Marión BERBINEAU special issue 8, edited by the National Research Institute on Transport and its security. This system is capable of locating the mobiles that circulate along the radiant waveguide. This location is based on the use of location-specific slots. These locating grooves are complementary to the slots regularly disposed continuously along the radiant waveguide and are perpendicular to these regular grooves. Regular slots allow the transmission of a large flow of information as well as measure the speed of mobiles. Information regarding the location of mobile phones is not accessible REF: 23938 nevertheless more than when flying, that is to say when the mobile moves along the radiant waveguide. In certain applications, the mobile is in the garage area in the workshop or in the parking area or at the entrance of the station. For such applications, it is necessary to have a device for transmitting information that can be read when the mobile is stopped still parked above this information transmission device. For applications in which the mobile moves along the radiant waveguide, it is necessary to have a high capacity information transmission device. An object of the invention is thus a device for transmitting information by means of a radiant waveguide system. Another object of the invention is a method of transmitting information by means of a radiant waveguide system. According to the invention, the device for transmitting information by means of a radiant waveguide system, which guides the waves along which a mobile is traveling, is characterized in that it comprises: means for injecting an unmodulated carrier wave in the radiant waveguide, - punctiform halftone means, along the radiant waveguide, of a part of the energy of the unmodulated carrier wave, - modulation means for applying to the unmodulated carrier wave a signal of local modulation that represents the information destined to the mobile, and - means to irradiate to the destination of the mobile, the modulated carrier wave. The radiant waveguide information transmission device of the invention also satisfies any of the features according to the appended claims. According to the invention, the method of transmitting information by means of a radiant waveguide system guides wavelets along which a mobile moves, characterized in that it comprises the steps consisting of: injecting an unmodulated carrier wave in the radiant waveguide, - sampling in a timely manner, along the radiant waveguide, a part of the energy of the unmodulated carrier wave, - applying to the unmodulated carrier wave a local modulation signal representing the information destined to the mobile, and - irradiate, to the destination of the mobile, the modulated carrier wave. The method of transmitting information by means of a radiant waveguide system of the invention also satisfies any of the characteristics according to the appended claims. The device for transmitting information by means of a radiant waveguide system of the invention can be, by way of example, completely realized with the help of a right section of the short-span radiant waveguide., dimension near the wavelength in the air of the signals propagated in the radiant waveguide. A technology as such has been used for the realization of the model originally developed in the laboratories of the National Research Institute on Transport and Safety. An advantage of the device and the method of transmitting information by means of a radiant waveguide system of the invention is to take only a very small energy, approximately 0.02 dB on the radiant waveguide and thus to be able to have devices of transmission as often as scanning the mobiles along the radiant waveguide needs it. Another advantage of the device and the method of transmitting information using the radiant waveguide system of the invention is to realize a simple assembly, autonomous and provided with a minimum of components and connections. Another advantage of the device and the method of transmitting information by means of a radiant waveguide system of the invention is that it does not require a continuous power source. Another advantage of the device and the method of transmitting information by means of a radiant waveguide system of the invention is that it is capable of providing a precise location pulse signal. Another advantage of the device and the method of transmitting information by means of a radiant waveguide system of the invention is that it is capable of indicating the direction of movement of the mobile without ambiguity. Other objects, features and advantages of the invention will appear on reading the description of the preferred embodiment of the device and the method of transmitting information by means of a radiant waveguide system, the description being made with reference to the accompanying drawings in which: - Figure 1 is a general view of the information transmission device by radiant waveguide system, according to the preferred embodiment of the invention, - Figure 2 represents the radiant waveguide and its directing coupler of the device of transmission of figure 1, - figure 3A represents the resonant cavity of the transmission device of figure 3, - figure 3B represents the upper face of the resonant cavity and its modulation device, - figure 3C represents the resonant cavity and its device that generates the signal representing the information to be transmitted, - Figure 4 is a General description of the information transmission device and its power supply device, - Figure 5 shows an embodiment of the device for receiving the modulated carrier wave arranged on the mobile. The IAGO system takes advantage of the large bandwidth of a microwave waveguide operating in TE01 mode, in particular to authorize the transmission of high-capacity information between the ground and the mobiles. This important pass band also allows a complementary unmodulated carrier wave to be transmitted in the radiant waveguide. An unmodulated carrier wave as such is emitted at a low level and propagates throughout the radiant waveguide. This unmodulated carrier wave suffers little attenuation and is amplified by means of the same repeaters in line with those used to regenerate the other signals transmitted in the radiant waveguide. The unmodulated carrier wave is thus present throughout the waveguide radiant essentially inside the guide. This unmodulated carrier wave is not detectable after the mobile and is not related more to the origin of the identifiable information or signature. According to the invention, the device and the method of transmitting information by means of a radiant waveguide system, for example the IAGO system, are such that they consist of sampling along the radiant waveguide and at strategic locations for the mobile scan, a part of the energy that propagates in the waveguide indiscernibly in the global energy balance. The sampled energy is radiated to the destination of the mobile. During this stage, a local modulation signal is applied to the unmodulated carrier wave, which signal is to be delivered to the mobile that circulates along the waveguide. Figure 1 is a general view of the information transmission device by radiant waveguide system according to the preferred embodiment of the invention. In the preferred embodiment of the information transmission device using the radiant waveguide system of the invention, the mobile (not shown) is a railway vehicle. It is clear that in other application domains, mobiles can be wheelbarrows or any other mobile means. As shown in FIG. 1, a resonant cavity 1 is arranged on one side of the radiating waveguide 2. The radiant waveguide and the resonant cavity 1 each comprise, on their opposite sides, a directing coupler. , respectively 3 and 4. The direct couplers are constituted, for example, of two circular openings of important sizes in relation to the period of the unmodulated carrier wave. Figure 2 shows the radiant waveguide of the information transmission device of Figure 1 and its directrix coupler. Figure 3A represents the resonant cavity of the transmission device of Figure 1 and its directrix coupler. In the LAGO system, the radiant waveguide operates in TE01 mode.

There is then virtually no electric field on the lateral ends of this radiant waveguide. The size of the openings must therefore be large to authorize the level of coupling required; Therefore, this dimension becomes mechanically uncritical. An embodiment as such makes it possible to repeatedly obtain coupling coefficients of the order of -40 dB in relation to the power level transmitted in the radiant waveguide. The length of the resonant cavity 1 is as small as possible so that the interior volume of this cavity resonates in a cavity according to a fundamental mode TE011. In an embodiment as such of the resonant cavity, any directivity is suppressed and the coupling coefficient remains identical whether the radiant waveguide is fed upstream or downstream. The fundamental mode resonant cavity TE011 is short-circuited at its extremities and comprises a resonant semi-wave slot 5. The resonant half-wave slot is made on the largest outer face of the resonant cavity turned towards the railway vehicle. The resonant semi-wave groove is oriented perpendicular to the grooves 6 of the radiant waveguide. This resonant half-wave slot radiates the energy collected from the radiant waveguide to the resonant cavity in TE ^ mode. The irradiation of the half-wave resonant groove is carried out in linear polarization perpendicular to the regular grooves of the radiant waveguide. These regular slots are called transmission and measurement slots of the waveguide speed. This irradiation thus authorizes a decoupling of the order of 15 dB in relation to the signals transmitted by the transmission and speed measurement slots of the waveguide. The carrier wave propagating in the waveguide, which is a pure sinusoidal signal, is coupled locally to the railway vehicle by means of the resonant cavity and its half-wave resonant slit. This sinusoidal signal is locally modulated. To do this, a modulation device, for example a Schottky-type diode, is disposed between the edges of the half-wave resonant slot and a point of high impedance at the desired frequency. Figure 3B depicts the resonant cavity and its modulation device. This diode is polarized by means of a continuous current applied to its terminals and is capable of short-circuiting the resonant half-wave slot to the rhythm of the polarization, the slot has at this point and for the working frequency considered a point of high impedance. Thus, a pure sinusoidal signal amplitude modulation sampled along the radiant waveguide is produced.

The coefficient of coupling between the radiant waveguide and the resonant cavity is of the order of -40 dB, the maladaptation related to this short circuit to the modulation rhyme is not detectable in the radiant waveguide. Also, if a hyperfrequency power frequency level is considered in the radiant waveguide, the modulated signal is not reinjected in the best of cases, rather than at -80 dB below this reference level towards the radiant waveguide, either 40 dB in the direction of the radiant waveguide towards the resonant cavity and - 40 dB in the direction of the resonant cavity towards the radiant waveguide. The modulated signal produced in the resonant cavity is neither transmitted nor transmitted along the waveguide radiant or upstream or downstream of the resonant cavity. A device 8 generates the signal representing the information to be transmitted to the railway vehicle. This signal representing the information to be transmitted is for example a signal composed of a binary series. The possible binary flow is important and is not limited by the switching times of the Schottky diode and the frequency of the pure sinusoidal signal. By order of size order, several megabits per second can be accessible. By way of example, the device 8 that generates the signal representing the information to be transmitted can comprise a device of the picocontroller type that stores in a memory of the EEPROM type a frame and generates this frame repetitively to the destination of the Schottky diode when it is it supplies an energy. Other suitable devices capable of polarizing the diode Schottky to the rhythm of the information to be transmitted can be used. The energy present in the resonant cavity is very weak, of the order of 40 dB under the power level present in the radiant waveguide, it is possible to dispose judiciously the device 8 that generalizes the signal representing the information to be transmitted to the interior of the resonant cavity without disturbing in particular the operation of this electronic circuit, nor the resonance in fundamental mode of the resonant cavity. Figure 3C represents the resonant cavity and its device that generates the signal representing the information to be transmitted. The power supply of this device 8 that generates the signal representing the information to be transmitted, for example by means of a voltage source of 5V under a few milliamperes, can advantageously be provided by means of tele-feeding by means of a low frequency signal that works to a few hundred kilohertz and even a few megahertz. Figure 4 is a general view of the information transmission device and its power-feeding device. This low frequency signal is magnetically coupled to the resonant cavity by means of two resonant loops 9, 10A or 10B. By way of example, a first resonant loop 9 of the series type is associated with the emission of energy and a second resonant loop 10A, 10B of the parallel type is associated with the reception of energy, emission and reception of energy that are effected to the frequency of tele-feeding. The energy emission loop 9 is integral with the railway vehicle (not shown) and continuously generates a little energy, for example of a value less than one watt, at the destination of at least one energy receiving loop 10A, 10B solidary of the resonant cavity 1. The energy reception loop 10A, 10B feeds the device 8 that generates the signal representing the information to be transmitted to the railway vehicle. Then, despite the fact that the ultrahrequency irradiation emitted from the energy emission loop 9 is poorly controlled and can be propagated by reflection or diffraction relatively far from the resonant cavity, the signal representing the information to be transmitted to the railway vehicle does not will be generated more than when the device 8 that generates the signal representing the information to be transmitted is powered by tele-power. The protection against crosstalk is obtained because the ultrahrequency irradiation emitted from the energy emission loop 9 is a low frequency signal of which the amplitude decreases according to the laws of magnetostatics, ie in inverse ratio of the cube of the distance between the sender and the receiver.

According to a possible embodiment, a first energy reception loop 10A is arranged upstream of the resonant cavity 1 and provides a continuous supply voltage V1 (a second reception loop) when approaching or leaving the rail vehicle. 10B is arranged downstream of the resonant cavity 1 and provides a continuous supply voltage V2 during the distance or approach of the rail vehicle The device 8 that generates the signal representing the information to be transmitted can thus be tele-powered continuously during the passage of the railway vehicle from upstream to downstream of the resonant cavity or inversely, the transition from the direct voltage V <to the direct voltage V2 or conversely can be used to provide a signal of the passing of the railway vehicle above of the resonant cavity.The transition from the direct voltage V, to the direct voltage V2 can igu ally be used to provide a signal indicating the direction of the top-down passage of the rail vehicle. The transition from the direct voltage V2 to the direct voltage V1 can also be used to provide a signal indicating the passage from the bottom to the top of the rail vehicle. Figure 5 shows an embodiment of the receiving device of the modulated carrier wave arranged on the mobile. This receiving device 11 is constituted by an antenna 12 connected to an amplification chain 13, of filtering at the pure sinusoidal signal frequency and of amplitude detection and has the function of restoring the transmitted information.

It is noted that in relation to this date, the best method known to the applicant to carry out the aforementioned invention, is that which is clear from the present description of the invention.

Having described the invention as above, the content of the following claims is claimed as property.

Claims (36)

1. Claims 1. An information transmission device for radiant waveguide system, which guides the waves along which a mobile moves, characterized in that the device comprises: - means for injecting an unmodulated carrier wave into the guide of radiant waves, - point sampling means, along the waveguide, of a part of the energy of the unmodulated carrier wave, - modulation means for applying to the unmodulated carrier wave a local modulation signal representing the information destined to the mobile, and - means for irradiating, to the destination of the mobile, the modulated carrier wave.
2. 2. The device according to claim 1, characterized in that it comprises a resonant cavity disposed on one side of the radiant waveguide.
3. 3. The device according to claim 2, characterized in that the length of the resonant cavity is such that the interior volume of this resonant cavity resonates in the cavity according to a fundamental mode TE011.
4. 4. The device according to claim 3, characterized in that the resonant cavity in fundamental mode TE011 is short-circuited at its extremities.
5. 5. The device according to any of claims 1 to 4, characterized in that the sampling means are composed of a steering coupler made on the sides facing each other of the radiant waveguide and the resonant cavity.
6. 6. The device according to claim 5, characterized in that the direct coupling devices are composed of at least one opening.
7. 7. The device according to any of claims 2 to 5, characterized in that the means for irradiating comprise a half-wave resonant groove made in the resonant cavity.
8. 8. The device according to claim 7, characterized in that the half-wave resonant slot is made on the large outer face of the resonant cavity turned towards the mobile.
9. 9. The device according to any of claims 7 and 8, characterized in that the half-wave resonant slot is oriented perpendicular to the grooves of the radiant waveguide.
10. 10. The device according to any of claims 7 to 9, characterized in that the modulation means comprise a modulation device disposed between the edges of the half-wave resonant slot at a point of high impedance at the desired frequency.
11. 11. The device according to claim 10, characterized in that the modulation device is composed of a Schottky diode polarized by means of a direct current applied to the terminals of the diode in order to short circuit the half-wave resonant slot to the Polarization rhythm.
12. 12. The device according to any of claims 10 and 11, characterized in that a device that generates the signal representing the information to be transmitted polarizes the modulation device.
13. 13. The device according to any of claims 10 to 12, characterized in that the device that generates the signal representing the information to be transmitted is placed inside the resonant cavity.
14. 14. The device according to any of claims 10 to 13, characterized in that the device that generates the signal representing the information to be transmitted is fed by tele-feeding.
15. 15. The device according to claim 14, characterized in that the power supply of the device that generates the signal representing the information to be transmitted is carried out by means of a low frequency signal comprised between a few hundred kilohertz and some megahertz.
16. 16. The device according to any of claims 14 and 15, characterized in that the power supply is effected by means of an energy emission loop, integral with the mobile, to the destination of at least one power receiver loop integral with the cavity resonant.
17. 17. The device according to claim 16, characterized in that a first energy reception loop is disposed upstream of the resonant cavity and provides in the approach or during the moving away from the mobile a continuous supply voltage V ,, a second reception loop of energy is disposed downstream of the resonant cavity and provides during the distance or approach of the mobile a continuous supply voltage V2.
18. 18. The device according to any of the preceding claims, characterized in that a device for receiving the modulated carrier wave is arranged in the mobile.
19. 19. The device according to claim 18, characterized in that the receiving device comprises an antenna connected to an amplification chain, filtering at the frequency of the pure sinusoidal signal and of amplitude detection.
20. 20. A method of transmitting information by means of a radiant waveguide system, which guides the waves along which a mobile moves, the method is characterized in that it comprises the main steps consisting of: - injecting an unmodulated carrier wave ithe radiant waveguide, - point sampling, along the radiant waveguide, a part of the energy of the unmodulated carrier wave, - apply to the unmodulated carrier wave a local modulation signal representing the information intended to the mobile, and - to irradiate, to the mobile destination, the modulated carrier wave.
21. 21. The method according to claim 20, characterized in that the stage consisting of sampling a part of the energy of the unmodulated carrier wave in a timely manner is carried out by direct means arranged on the sides facing each other of the waveguide. radiant and resonant cavity.
22. 22. The method according to any of claims 20 and 21, characterized by a step consisting in that the resonant cavity, arranged on one side of the radiant waveguide, resonates in a cavity according to a fundamental mode TE011.
23. 23. The method according to claim 20, characterized in that the step consisting of applying a local modulation signal to the unmodulated carrier wave is carried out by applying a continuous stream to the terminals of a modulation device in order to polarize the device of modulation and of shorting a resonant semi-wave slot to the rhythm of the polarization, the resonant slot forms part of the resonant cavity.
24. 24. The method according to claim 23, characterized in that the modulation device is biased by means of a signal representing the information to be transmitted.
25. 25. The method according to any of claims 23 to 24, characterized by a step consisting of storing in memory, in a memory of the EEPROM type, a frame, by means of a device of the picocontroller type and generating the frame in a manner repetitive to the destination of the modulation device after an energy is provided.
26. 26. The method according to any of claims 23 to 25, characterized by a step consisting of feeding a device that generates the signal representing the information to be transmitted by tele-feeding.
27. 27. The method according to claim 26, characterized in that the tele-power supply of the device that generates the signal representing the infoption to be transmitted is carried out by means of a low frequency signal, with a frequency comprised between a few hundred kilohertz and a few megahertz. .
28. 28. The method according to claim 27, characterized by a step that consists in magnetically coupling the low frequency signal to the resonant cavity by means of two resonant loops.
29. 29. The method according to claim 28, characterized by a step consisting in associating the first resonant loop of the series type to the energy emission and the second resonant loop of the parallel type to the reception of energy.
30. 30. The method according to claim 29, characterized in that the emission and reception of energy are effected at the power-up frequency.
31. 31. The method according to any of claims 26 to 30, characterized in that the tele-power supply of the device that generates the signal representing the information to be transmitted is made to the passage of the mobile by means of the energy reception loop.
32. 32. The method according to claim 31, characterized in that a first energy reception loop, arranged upstream of the resonant cavity, provides a continuous supply voltage V1 when approaching or moving away from the mobile unit and a second reception loop. of energy, arranged downstream of the resonant cavity, provides during the distance or approach of the mobile a continuous supply voltage V2.
33. 33. The method according to claim 32, characterized in that the transition of the direct voltage V, to the direct voltage V2 or inversely provides a signal of the passage of the mobile above the resonant cavity.
34. 34. The method according to any of claims 32 and 33, characterized in that the transition from the direct voltage V, to the direct voltage V2, provides a signal indicating the direction of the passage upstream downstream of the mobile.
35. 35. The method according to any of claims 32 and 33, characterized in that the transition from the direct voltage V2 to the direct voltage V, provides a signal indicating the direction of the passage from downstream to upstream of the mobile.
36. 36. The method according to any of claims 20 to 28, characterized by a step consisting in restoring the information transmitted by means of a reception device constituted by an antenna connected to an amplification chain, filtering at the signal frequency pure sinusoidal and amplitude detection.