• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    Electromagnetic shielding attenuation measuring system of an infrastructure, as a function of frequency, characterized in that it comprises: A transmitter (10) of a signal which is a white noise of constant power over a frequency band between a minimum frequency and a maximum frequency, a receiver (12) of a signal, the transmitter and the receiver being able to transmit and receive a signal on either side of the infrastructure, the receiver comprising: filtering module (121) capable of performing a sliding filtering on the received signal (SR) between the minimum frequency and the maximum frequency, and a synchronous double detection module (122) capable of performing a synchronous double detection on a signal provided by the filter module.
    公开号:FR3042602A1
    申请号:FR1559888
    申请日:2015-10-16
    公开日:2017-04-21
    发明作者:Jean-Christophe Joly；Sylvain Jonniau；Matthieu Werquin；Christophe Gaquiere；Benjamin Choteau；Nicolas Vellas
    申请人:Commissariat a lEnergie Atomique CEA；Commissariat a lEnergie Atomique et aux Energies Alternatives CEA；
    IPC主号:
    专利说明:

    ATTENUATION MEASUREMENT SHIELD DESCRIPTION
    TECHNICAL AREA
    The present invention relates to the electromagnetic shielding attenuation measurement of an infrastructure, as a function of frequency.
    STATE OF THE PRIOR ART Electromagnetic shielding attenuation of an infrastructure, also known as shielding efficiency or faradisation, is conventionally measured according to the principle of double weighing. For this, a measuring device comprising a transmitter and a signal receiver is used in the following manner.
    A first reference or calibration measurement is performed with the transmitter and the receiver arranged in the absence of infrastructure at a predetermined distance. The transmitter transmits a signal of a given transmission power and this signal is received by the receiver.
    A second measurement is performed by first arranging the transmitter and the receiver on either side of the infrastructure whose shielding attenuation is to be determined. The transmitter and the receiver are arranged at the same distance and in the same orientation and the signal is emitted with the same transmission power as for the first measurement. This signal is received by the receiver. Shield attenuation is the ratio of the first received power to the second.
    The attenuation measurement is performed as a function of the frequency, typically of the order of the kHz to the ten GHz. The shielding attenuation is therefore given as a function of the frequency: for example, a factor 5 in power (ie 10logio5 = 7 dB) at 1 GHz. This implies a frequency synchronization between transmission and reception.
    A first solution to synchronize transmitter and receiver is to measure at discrete frequencies. In this case, a measurement is valid only at a given frequency and it is necessary to reproduce the measurement steps for each frequency.
    A second solution to synchronize is to establish a link between transmitter and receiver. This connection can be established via a wire conductor or an optical fiber, but this requires the presence of a passageway, such as for example an opening, a honeycomb structure or a waveguide, through the 'infrastructure. In addition, the passage of a wired conductor without recovery of shielding would distort the measurement, since the wired conductor would be perceived as a defect of faradisation.
    The link between transmitter and receiver can also be carried out by radio wave, possibly in the measurement band. This is only possible if the shielding attenuation of the infrastructure is relatively limited, so that the radio wave can transit through the infrastructure.
    Moreover, the electromagnetic environment of the infrastructure to be characterized is likely to be noisy. Indeed, GSM waves, wifi or radar, for example, can form ambient electromagnetic pollution. This electromagnetic pollution could be interpreted as a lack of faradisation of the infrastructure. Thus, the measured shielding attenuation would be erroneous at the frequencies of electromagnetic pollution.
    To take into account the electromagnetic pollution with known meters, it is possible to perform an ambient noise measurement prior to calibration. A noise power is thus determined. It is subtracted from the power measurements then made during the attenuation calculation.
    However, this calculation assumes that the electromagnetic pollution is constant over time. If it is intermittent and varies between measurements or during measurements, the calculated attenuation is then distorted.
    DISCLOSURE OF THE INVENTION The invention aims to solve the problems of the prior art by providing an electromagnetic shielding attenuation measuring system of an infrastructure, as a function of frequency, characterized in that it comprises:
    A transmitter of a signal that is a constant power white noise on a frequency band between a minimum frequency and a maximum frequency,
    A receiver of a signal, the transmitter and the receiver being able to transmit and receive a signal on either side of the infrastructure, the receiver comprising:
    A filtering module capable of performing sliding filtering on the received signal (SR) between the minimum frequency and the maximum frequency, and
    A synchronous dual detection module capable of performing a synchronous double detection on a signal provided by the filtering module.
    Thanks to the invention, the shielding attenuation measurement is performed more simply and faster than in the prior art.
    In particular, the measurement is carried out for a frequency chosen in a frequency range, without it being necessary to repeat the signal transmission and reception operations.
    According to a preferred feature: The transmitter is able to emit a signal which is a white noise with two levels of alternating power, and
    The receiver is able to determine the difference between the powers received corresponding to the two power levels of the transmitted signal.
    Thus the contribution of the ambient noise can be canceled. The shielding attenuation measurement according to the present invention is independent of the electromagnetic environment.
    According to a preferred characteristic, the receiver furthermore comprises a module for determining shielding attenuation as a function of the results provided by the synchronous double detection module determined following the transmission and reception of signals carried out in the absence of the infrastructure then on both sides of the infrastructure. The invention also relates to a receiver for an electromagnetic shielding attenuation measuring system of an infrastructure, as a function of frequency, characterized in that it is able to receive a signal emitted by a transmitter of a signal which is a white noise of constant power over a frequency band between a minimum frequency and a maximum frequency, the transmitter and the receiver being able to transmit and receive a signal on either side of the infrastructure,
    And characterized in that it comprises
    A filtering module capable of performing sliding filtering on the received signal (SR) between the minimum frequency and the maximum frequency, and
    A synchronous dual detection module capable of performing a synchronous double detection on a signal provided by the filtering module.
    According to a preferred characteristic, the receiver furthermore comprises a module for determining shielding attenuation as a function of the results provided by the synchronous double detection module determined following the transmission and reception of signals carried out in the absence of the infrastructure then on both sides of the infrastructure. The invention also relates to an electromagnetic shielding attenuation measuring method of an infrastructure, as a function of frequency, characterized in that it comprises the steps of:
    Emitting a signal that is a constant power white noise on a frequency band between a minimum frequency and a maximum frequency, Receiving a signal, the transmission and reception of signal being carried out on both sides infrastructure,
    Filtering sliding on the signal received between the minimum frequency and the maximum frequency,
    Double synchronous detection on a signal provided by the filter module.
    According to a preferred characteristic, the electromagnetic shielding attenuation measuring method of an infrastructure also comprises preliminary steps for transmitting and receiving the signal in the absence of the infrastructure, filtering sliding on the received signal, and double synchronous detection on a signal provided by the filtering module.
    According to a preferred characteristic, the electromagnetic shielding attenuation measurement method of an infrastructure further comprises a step of determining shielding attenuation as a function of the results of the sliding filtering and synchronous double detection steps performed as a result of the sending and receiving signal in the absence of the infrastructure and then on both sides of the infrastructure.
    The receptor and the method have advantages similar to those previously presented.
    In a particular embodiment, the steps of sliding filtering and synchronous double detection of the method according to the invention are implemented by computer program instructions.
    Consequently, the invention also relates to a computer program on an information medium, this program being capable of being implemented in a computer, this program comprising instructions adapted to the implementation of the sliding filtering steps. and dual synchronous detection of a method as described above.
    This program can use any programming language, and be in the form of source code, object code, or intermediate code between source code and object code, such as in a partially compiled form, or in any other form desirable shape. The invention also relates to a computer readable information medium, and comprising computer program instructions adapted to the implementation of the steps of a method as described above.
    The information carrier may be any entity or device capable of storing the program. For example, the medium may comprise storage means, such as a ROM, for example a CD ROM or a microelectronic circuit ROM, or a magnetic recording means, for example a diskette or a hard disk. On the other hand, the information medium may be a transmissible medium such as an electrical or optical signal, which may be conveyed via an electrical or optical cable, by radio or by other means. The program according to the invention can be downloaded in particular on an Internet type network.
    Alternatively, the information carrier may be an integrated circuit in which the program is incorporated, the circuit being adapted to execute or to be used in the execution of the method according to the invention.
    BRIEF DESCRIPTION OF THE DRAWINGS Other characteristics and advantages will appear on reading the following description of a preferred embodiment, given by way of non-limiting example, described with reference to the figures in which:
    FIG. 1 represents a shield attenuation measurement system, according to an embodiment of the present invention,
    FIG. 2 represents a shield attenuation measurement method, according to an embodiment of the present invention,
    FIG. 3 represents a signal emitted by the shield attenuation measurement system, according to an embodiment of the present invention,
    FIG. 4 represents a sliding filtering performed on a received signal, by the shield attenuation measurement system, according to an embodiment of the present invention,
    FIG. 5 represents a signal emitted by the shield attenuation measuring system, according to an embodiment of the present invention,
    Figs. 6a and 6b show respectively a signal received by the shield attenuation measurement system, according to an embodiment of the present invention.
    DETAILED PRESENTATION OF PARTICULAR EMBODIMENTS
    According to a preferred embodiment and represented in FIG. 1, a shield attenuation measurement system comprises a signal transmitter 10 connected to a transmission antenna 11. The transmitter 10 is able to transmit a signal which is described in the following.
    The shield attenuation measurement system also comprises a receiver 12 connected to a reception antenna 13.
    The transmitting and receiving antennas can be of any type, for example:
    Directional or omnidirectional,
    Wide band or narrow band, - A linear or circular polarization, A electronic or mechanical misalignment,
    Wired, opening or planar, traveling or stationary waves.
    The receiver 12 is able to receive a signal received by the receiving antenna 13. The receiver 12 comprises a filtering module 121, a synchronous double detection module 122 and a measurement processing module 123 for determining the attenuation of shielding. The treatments performed by the different modules are described below.
    The shield attenuation measurement system can be battery powered.
    It should be noted that only the elements of the shield attenuation measuring system that are useful for understanding the invention are described.
    The shield attenuation measurement system is used according to the double weighing principle. A first measurement, called reference measurement, is performed when the transmitting antenna 11 and the receiving antenna 13 are arranged in the absence of the structure whose shielding attenuation is to be determined, at a distance and according to a specific orientation. The transmitting antenna and the receiving antenna are then placed on either side of the structure whose shielding attenuation is to be determined, at the same distance and in the same orientation determined. A second measurement is performed.
    The signals emitted for the two measurements are of the same power. Shield attenuation is the ratio of the powers received during the two measurement operations. The attenuation measurement is performed as a function of the frequency, typically of the order of the kHz to the ten GHz.
    FIG. 1 illustrates the configuration for carrying out the second measurement, in the case where the structure is a wall 20 of a part of a building. The wall 20 comprises a door 21 whose angles constitute potential shielding defects. The antennas 11 and 13 are thus placed on either side of the wall 20.
    FIG. 2 represents the operation of the shield attenuation measuring system, according to one embodiment of the invention. This operation is represented in the form of a flowchart comprising steps E1 to E5. Step E1 is the transmission of a signal SE by the transmitter 10.
    FIG. 3 represents the signal SE emitted by the transmitter 10, as a function of the frequency. The emitted signal SE is a constant power white noise, on a frequency band between a minimum frequency Fmin and a maximum frequency Fmax. The next step E2 is the reception of a signal SR by the receiver 12. The next step E3 is a sliding filtering performed on the received signal SR.
    FIG. 4 represents the sliding filtering which is performed on the received signal SR by the receiver 12. The signal SR is in the frequency band between the frequencies F min and Fmax-
    A sliding filter is applied between the frequencies Fmin and Fmax. The sliding filter has a predetermined width LF around a frequency Fo which varies by F min 3 F max · The following step E4 is the determination of the received power at a given frequency included in the frequency band of the signal of SE emission. The received power is expressed in Watts. It is stored in a memory, not shown, internal to the receiver or associated with the latter.
    As explained above, a reference measurement is performed when the transmitting antenna and the receiving antenna are arranged in the absence of the structure whose shield attenuation is to be determined, at a distance and in an orientation determined. Steps El to E4 are therefore covered for this first measurement. The stored power is then a received reference power PRref. It should be noted that this power depends on the distance between the transmitting antenna and the receiving antenna, the orientation of the antennas and the power of the transmitted signal. Provided that these parameters are respectively equal for different shielding attenuation determinations, the same reference received power can therefore be used later for these different shield attenuation determinations. The transmitting antenna and the receiving antenna are then placed on either side of the structure whose shielding attenuation is to be determined, at the same distance and in the same orientation determined. A second measurement is made from the same transmission signal SE. Steps E1 to E4 are therefore covered for this second measurement. Step E4 then results in a received signal power PR for a given frequency within the frequency band of the transmit signal SE. Step E5 is the determination of the shielding attenuation for one or more frequency (s) of the frequency band between the frequencies Fmin and Fmax. The shielding attenuation is determined for a given frequency F. It is equal to the ratio of the power of the reference signal PRref and the power of the received signal PR during the second measurement, at the given frequency F. It is recalled that the powers are expressed in Watts. Step E5 is detailed below.
    Any variations in environmental noise between the two measurements are taken into account as follows.
    FIG. 5 represents the emitted signal SE by the transmitter 10 as a function of time. The emitted signal SE is a chopped white noise in the form of cyclic ratio slots> 2. The duty cycle may be different.
    The emitted power is alternately at a high state Ehaut corresponding to a transmission time and a low state Ebas where the transmitted power is zero, corresponding to emission stop.
    FIGS. 6a and 6b show the received signal SR by the receiver 12 as a function of time, respectively during the reference measurement and during the second measurement.
    In both cases, reference measurement and second measurement, the received signal SR is also chopped, in the form of slots of duty ratio> 2. The received power is alternately at a high state corresponding to a transmission time and at a low state where the received power is lower but not zero, corresponding to emission stop. The power received in the low state corresponds to the environment noise and the power received in the high state corresponds to the sum of the white noise received from the transmitter and the environmental noise.
    After the reference measurement, the difference between the power received in the high state RHref and the power received in the low state RBref is calculated, which makes it possible to cancel the contribution of the ambient noise.
    Likewise, after the second measurement, the difference between the power received in the high state RH and the power received in the low state RB is calculated, again to cancel the contribution of the ambient noise.
    In order to measure the difference in power received between the successive transmission and stopping phases of the transmission without knowing the instant of the phase change controlled by the transmitter 10, the module 122 implements a synchronous double detection. This eliminates any phase shift Δφ between the received signal SR at the modulation frequency Fm and a demodulation signal.
    The processing carried out on the signal ν, η coming from the sliding filter 121 is considered. The signal ν, η is applied at the input of the synchronous double detection module 122.
    The quantity AVm is representative of the difference of the received powers (RH-RB) corresponding to the emission of the white noise of the duty cycle '/ 2.
    Compared to conventional synchronous detection, the module 122 performs a first demodulation at the modulation frequency Fm and a second frequency demodulation (Fm + n / 2). The quantities: 0.5.AVm.cos (Acp) and 0.5.AVm.cos (Acp + Ti / 2) = 0.5.AVm.sin (Acp) are thus determined. These quantities are then squared and summed. The module 122 then supplies the output (0.5.AVm) 2. (cos2 (Acp) + sin2 (Acp)) at the output. This quantity is equal to (0.5.Avin) 2.
    Thus we obtain an output signal equal to (0.5.AVin) 2. The output signal is independent of any phase shift between the modulation signal used for transmission and the demodulation signal used for reception.
    This quantity is an image of AVm, where AV, n is representative of the difference of the received powers (RH-RB) corresponding to the emission of the white noise with a duty ratio> 2 at the modulation frequency Fm. The shielding attenuation is determined for a given frequency F, by the module 123. It is equal to the ratio of the difference calculated for the reference measurement and the difference calculated for the second measurement: (RHref-RBref) / (RH - RB). It is recalled that all the powers are here expressed in Watts.
    Treatments made from the signal received by the receiver 12 may be repeated for any frequency in the frequency band from F min to F max.
    The dynamics of the measurement system is increased by the use of an automatic gain control so as to work at constant power input of the detection diode.
    权利要求:
    Claims (10)
    [1" id="c-fr-0001]
    1. Electromagnetic shielding attenuation measuring system of an infrastructure, as a function of frequency, characterized in that it comprises: A transmitter (10) of a signal (SE) which is a constant power white noise in a frequency band between a minimum frequency and a maximum frequency, a receiver (12) of a signal (SR), the transmitter and the receiver being able to transmit and receive a signal on either side of the infrastructure, the receiver comprising: a filtering module (121) able to carry out sliding filtering on the received signal (SR) between the minimum frequency and the maximum frequency, and a synchronous double detection module (122) capable of performing a double synchronous detection on a signal provided by the filtering module.
    [2" id="c-fr-0002]
    Electromagnetic shielding attenuation measuring system of an infrastructure according to Claim 1, characterized in that: The transmitter (10) is capable of transmitting a signal (SE) which is a white noise with two levels of The receiver (12) is capable of determining the difference between the received powers corresponding to the two power levels of the transmitted signal.
    [3" id="c-fr-0003]
    Electromagnetic shielding attenuation measurement system of an infrastructure according to claim 1 or 2, characterized in that the receiver (12) further comprises a module (123) for determining the shielding attenuation as a function of results provided by the synchronous dual detection module determined following the transmission and reception of signal made in the absence of the infrastructure and then on both sides of the infrastructure.
    [4" id="c-fr-0004]
    Receiver (12) for an electromagnetic shielding attenuation measuring system of an infrastructure, as a function of frequency, characterized in that it is able to receive a signal emitted by a transmitter (10) of a signal (SE) which is a white noise of constant power over a frequency band between a minimum frequency and a maximum frequency, the transmitter and the receiver being able to transmit and receive a signal on both sides of the infrastructure And characterized in that it comprises a filtering module (121) capable of performing sliding filtering on the received signal (SR) between the minimum frequency and the maximum frequency, and a synchronous double detection module (122) capable of perform a double synchronous detection on a signal provided by the filtering module.
    [5" id="c-fr-0005]
    5. Receiver according to claim 4, characterized in that it further comprises a module (123) for determining the shielding attenuation according to the results provided by the synchronous dual detection module determined following the emission and the signal reception carried out in the absence of the infrastructure and then on both sides of the infrastructure.
    [6" id="c-fr-0006]
    6. Electromagnetic shielding attenuation measuring method of an infrastructure, as a function of frequency, characterized in that it comprises the steps of: Emitting (El) of a signal (SE) which is a white noise of constant power over a frequency band between a minimum frequency and a maximum frequency, reception (E2) of a signal (SR), the transmission and reception of signal being carried out on both sides of the infrastructure, Sliding filtering (E3) on the received signal (SR) between the minimum frequency (Fmin) and the maximum frequency (Fmax), Double synchronous detection (E5) on a signal provided by the filtering module.
    [7" id="c-fr-0007]
    Electromagnetic shielding attenuation measuring method of an infrastructure according to claim 6, characterized in that it furthermore comprises preliminary steps for transmitting and receiving the signal in the absence of the infrastructure, sliding filtering on the received signal and double synchronous detection on a signal provided by the filtering module.
    [8" id="c-fr-0008]
    8. electromagnetic shielding attenuation measuring method of an infrastructure according to claim 7, characterized in that it further comprises a step (E5) for determining the shielding attenuation according to the results of the filtering steps. and dual synchronous detection carried out following the transmission and reception of signal in the absence of the infrastructure and then on both sides of the infrastructure.
    [9" id="c-fr-0009]
    A computer program comprising instructions for performing the sliding filtering and synchronous dual process detection steps of any one of claims 6 to 8 when said program is executed by a computer.
    [10" id="c-fr-0010]
    A computer-readable recording medium on which a computer program is recorded including instructions for performing the sliding filtering and synchronous dual-detecting steps of the method according to any one of claims 6 to 8.
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    同族专利:
    公开号 | 公开日
    FR3042602B1|2019-05-10|
    US9859999B2|2018-01-02|
    EP3156810B1|2019-12-18|
    ES2776254T3|2020-07-29|
    US20170111129A1|2017-04-20|
    EP3156810A1|2017-04-19|
    引用文献:
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    US6255830B1|1998-05-04|2001-07-03|Nortel Networks Limited|Method of testing shielding effectiveness and electromagnetic field generator for use in testing shielding effectiveness|
    FR2635191B1|1988-08-05|1990-10-05|Merlin Gerin|METHOD AND DEVICE FOR CONTROLLING A QUASI-CLOSED ELECTROMAGNETIC SCREEN|
    US5828220A|1995-11-02|1998-10-27|The United States Of America As Represented By The Secretary Of The Army|Method and system utilizing radio frequency for testing the electromagnetic shielding effectiveness of an electromagnetically shielded enclosure|
    US7675294B2|2006-03-08|2010-03-09|Tritech Applied Sciences, Inc.|System and method for determining attenuation of electromagnetic waves impacting an electromagnetic shield|US8838022B2|2010-04-13|2014-09-16|Radeum, Inc.|System and method for securely pairing a wireless device using wireless communication|
    FR3033359B1|2015-03-02|2017-04-07|Snecma|MONOBLOC DRAWING DISK HAVING A HUB HAVING AN EVIDENCE FACED BY A BODY COMPRISING SAME|
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    RU2686880C1|2018-03-20|2019-05-06|Федеральное государственное казенное военное образовательное учреждение высшего образования "Военная академия войсковой противовоздушной обороны Вооруженных Сил Российской Федерации имени Маршала Советского Союза А.М. Василевского" Министерства обороны Российской Федерации|Method of estimating efficiency of screening devices of radioelectronic equipment|
    CN108776266A|2018-07-19|2018-11-09|西安工程大学|A kind of electromagnetic shielding dark room and its detection method for the detection of clothes shield effectiveness|
    RU2685058C1|2018-08-31|2019-04-16|Григорий Николаевич Щербаков|Electromagnetic screen quality evaluation method|
    RU2702453C1|2019-01-09|2019-10-09|Российская Федерация, от имени которой выступает Государственная корпорация по атомной энергии "Росатом" |Method of evaluating resistance of microelectronic equipment to external electromagnetic action|
    CN110708755B|2019-09-27|2021-11-09|浙江三维通信科技有限公司|Synchronous time sequence shielding method and shielding system|
    RU2761774C1|2021-05-25|2021-12-13|Федеральное казенное предприятие "Научно-производственный центр "Дельта", ФКП "НПЦ "Дельта"|Method for automatic control of efficiency of passive protection of electromagnetic protected structure|
    法律状态:
    2016-10-28| PLFP| Fee payment|Year of fee payment: 2 |
    2017-04-21| PLSC| Publication of the preliminary search report|Effective date: 20170421 |
    2017-10-31| PLFP| Fee payment|Year of fee payment: 3 |
    2018-10-30| PLFP| Fee payment|Year of fee payment: 4 |
    2019-10-31| PLFP| Fee payment|Year of fee payment: 5 |
    2020-10-30| PLFP| Fee payment|Year of fee payment: 6 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1559888A|FR3042602B1|2015-10-16|2015-10-16|ATTENUATION MEASUREMENT OF SHIELDING|
    FR1559888|2015-10-16|FR1559888A| FR3042602B1|2015-10-16|2015-10-16|ATTENUATION MEASUREMENT OF SHIELDING|
    US15/292,640| US9859999B2|2015-10-16|2016-10-13|Shielding attenuation measurement|
    ES16193970T| ES2776254T3|2015-10-16|2016-10-14|Shielding attenuation measurement|
    EP16193970.7A| EP3156810B1|2015-10-16|2016-10-14|Measurement of shielding attenuation|
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