EP2328288B1 - Système de reconnaissance et de localisation d'adaptations erronées d'impédance - Google Patents

Système de reconnaissance et de localisation d'adaptations erronées d'impédance Download PDF

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Publication number
EP2328288B1
EP2328288B1 EP10015153.9A EP10015153A EP2328288B1 EP 2328288 B1 EP2328288 B1 EP 2328288B1 EP 10015153 A EP10015153 A EP 10015153A EP 2328288 B1 EP2328288 B1 EP 2328288B1
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EP
European Patent Office
Prior art keywords
signal
spectrum
module
block
network
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EP10015153.9A
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German (de)
English (en)
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EP2328288A1 (fr
Inventor
Fernando Perez Gonzalez
Miguel Angel Conde Balado
José Luis Ledo Gavieiro
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sistemas Integrados de Servicios de Telecontrol SL
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Sistemas Integrados de Servicios de Telecontrol SL
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/12—Arrangements for observation, testing or troubleshooting
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/53—Arrangements specially adapted for specific applications, e.g. for traffic information or for mobile receivers
    • H04H20/61—Arrangements specially adapted for specific applications, e.g. for traffic information or for mobile receivers for local area broadcast, e.g. instore broadcast
    • H04H20/63—Arrangements specially adapted for specific applications, e.g. for traffic information or for mobile receivers for local area broadcast, e.g. instore broadcast to plural spots in a confined site, e.g. MATV [Master Antenna Television]

Definitions

  • the present invention relates to a system for detecting and locating impedance mismatches in a SMATV network.
  • SMATV satellite master antenna television; community television antenna system
  • the distribution networks for TDT services and satellite television systems contain, depending on their structural design, a large number of impedance matching deficiencies (impedance mismatches) on the transmission lines on which high-frequency signals are transmitted from the head unit to the user socket.
  • the reflected waves appear in essentially all those discontinuities that are present in SMATV networks, that is, in connections between distributors, downcomers, sockets and in coaxial cables, due to the fact that the devices used in the network are not ideal. This can lead to echoes with short recognition times that are located in key points in the network; and another group of mismatches can occur, caused by defective or disconnected cables, by the poor condition of the distribution elements and also by faults during installation that are difficult to identify.
  • the effect of an impedance mismatch at a certain point in a SMATV network is that a reflection or an echo of the signal is generated at that point with a different amplitude and phase. Reflections can influence the signal distribution in the rest of the network in a constructive or destructive form due to the aforementioned change in amplitude and phase in the reflected signal. Hence, a network that has been inappropriately treated can show undesirable effects. As a result of these reflections, the signal can be significantly affected in its performance, so that some of the services cannot be provided to some users.
  • ISI inter-symbol interference
  • Reflectometry in the domain of time consists in transmitting a pulse to the device to be evaluated and in the interception of the reflected signal in the device.
  • U.S. 6,278,730B1 discloses a non-invasive digital cable test system.
  • an estimation of an "in-phase error correlation signal”, a “quadrature error correlation signal” and a “cross-correlation signal” is required.
  • the system has a complex design and includes, among other things, an equalizer (equalizer 236, 214, 752) and a demodulation unit (606).
  • US 6,687,632 B1 discloses a method for testing CATV systems. The method assumes the input of a pseudo-aleatoric signal (formed by the circuit 20) into the respective system.
  • the invention is based on the object of creating a system for detecting and locating impedance mismatches in a SMATV network, which is designed to be simple in terms of its hardware and software structure.
  • the present invention has a number of advantages.
  • An advantageous embodiment of the invention is formed by a system for the detection and localization of impedance mismatches in a SMATV network according to patent claim 1.
  • An advantageous exemplary embodiment of the invention is characterized in that the system is designed in such a way that the resolution of the room recognition, the bandwidth used and the rank of the room recognition are varied.
  • Another advantageous embodiment of the invention is characterized in that the system is designed in such a way that the results that were determined in different measurements at various points in the SMATV network are compared with one another. This has the advantage that the origin of the various impedance mismatches can be distinguished in the case of ambiguous situations.
  • Figure 1 is a block diagram showing details of the system and method for detecting and locating impedance mismatches.
  • the spectrum of the signal is obtained that is used to identify and localize the position of the mismatches.
  • X rec ( ⁇ ) corresponds to the Fourier transform of the signal received at a specific point in a SMATV network in which there are K impedance mismatches.
  • X ( ⁇ ) is the Fourier transform of the signal that is transferred to the SMATV network without being modified by the effect of the mismatches ( is the Hilbert transform)
  • ⁇ R k y ⁇ I k are the real or imaginary parts of each of the K reflection coefficients associated with the various impedance mismatches in the SMATV network
  • ⁇ k is the delay of each replica that is formed by this mismatch with respect to the direct signal X ( ⁇ ).
  • the maximum bandwidth of the signal used is limited to the corresponding rank of distribution or signals within a SMATV network, whereby it is possible to use a lower bandwidth.
  • Tc the period of the temporal sampling
  • B the bandwidth of the signal used.
  • the signal After the signal is formed at the output of block 1041, it is used as an input signal for block 1042, in which a transformation of the spectrum is carried out, which enables the signal transmitted via the SMATV network to be better decoupled from the effects of the network.
  • a non-limiting example is the use of a logarithmic function, a logarithm on the base 10, which enables the effect of the mismatch on the transmitted signal to be separated.
  • the Inverse Fourier Transform (IFT) of N points is formed (block 105).
  • the number N limits the rank of the detectable mismatches to N ⁇ D / 2, since the application of IIFT is applied to a real signal and one obtains a complex symmetrical signal so that one can exclude half of the points.
  • a process of the time response 106 is applied, which consists in obtaining the module 1061 of the resulting complex signal and the subsequent elevation to a known power 1062.
  • the result is converted into a A plurality of maxima whose time position corresponds to each of the delays ⁇ k , which corresponds to each impedance mismatch in the SMATV network.
  • a normalization 107 is formed, which enables a comparison between various measurements that are made in the entire SMATV network.
  • the resulting signal is similar to the signal shown in Figure 4 is reproduced where because of the periodicity of the input spectrum, as from Figure 8 it can be seen that false positives can occur that can easily be confused with actual impedance mismatches. These false positives can be easily detected by calculating the periodicity of the input spectrum and they can be removed by comparing the spectra formed at different points of the SMATV network and using the difference as the input of the system according to the invention, with results obtained in Figure 5 are shown.
  • the process of recognizing and localizing the impedance mismatches ends with the recognition of the maxima in the signal 108 and with the acquisition of the special position associated with the time delay of the different maxima of the signal.
  • FIG. 6 shows a simplified representation of a SMATV network in which the detection and localization of mismatches takes place.
  • the block 201 corresponds to a satellite signal receiving antenna which positions the signal received in the IF band in the range between 950 and 2150 MHz.
  • the signal from block 201 is mixed with a terrestrial TV signal and transmitted to distribution network 204.
  • the mismatches in the derivation components 203 and in the sockets 205 are added to the input signal in the network 204, they are transmitted via the coaxial cable 207 to the system 206 for detection and localization of the mismatches.
  • FIG. 7 shows a schematic representation of the system of detection and localization of mismatches.
  • the signal comes into the system via 301.
  • the block 302 is a device for detecting the energy (power detector), which is used to inform the module 308 that a signal is present at the input.
  • the module 308 is the heart of the system and its mission is to organize the steps that the other blocks that are part of the global system have to follow depending on user instructions displayed via the interface 309, as well as the steps of the Power detector 302.
  • the RF signal is converted to a known intermediate frequency by means of the oscillator 305 and the mixer 303.
  • the bandpass filter 304 has the task of limiting the bandwidth that is used in the formation of the spectrum, whereby the signal that corresponds to the neighboring frequencies is eliminated, so that only the band of interest that is digitized by the analog-to-digital converter 307 remains.
  • the gain level of the signal is adjusted in advance with a gain control 306 in order to cover the entire dynamic range of the analog-digital converter and thus to reduce the quantization errors.
  • the signal is passed to the system 311, in which the necessary samples are taken to obtain the spectrum of the frequency range that is being used. After the samples are acquired, their frequency response is obtained and this is communicated to system 308 using any suitable communication interface.
  • the system 311 is an FPGA (Field Programmable Gate Array).
  • the system 308 calculates the location of the impedance mismatches. Block 308 will also adjust the frequency of the signal to capture the signal and thus shape the spectrum of the satellite band, an example of a resulting spectrum is in FIG Figure 8 shown.
  • FIG. 8 shows, as an example, a system which determines the unknown distance to the fault location LF within a cable 505 of length Lc which is arranged in a SMATV network 507.
  • the network has a part 503, the topology of which is not known.
  • the cable 505 and the system 506 for the detection and localization of mismatches are connected to a switch (diverting element) 504.
  • This preferred embodiment which does not constitute a restriction on the implementation of the invention or the scope of the present invention, relates to a system for the detection and localization of impedance mismatches in SMATV networks.
  • the system according to the invention is designed in such a way that input signals in a SMATV network are signals that are not input from outside through or into the system. System-internal signals are used to identify and localize impedance mismatches.

Claims (3)

  1. Système de reconnaissance et de localisation de mésappariements d'impédance dans des réseaux SMATV, qui comprend :
    - une entrée de radiofréquence (301) pour recevoir un signal dans un point du réseau SMATV ;
    - des moyens (302) pour détecter une énergie de ce signal ;
    - un étage mélangeur (303) pour convertir ce signal ;
    - un filtre passe-bande (304) pour filtrer le signal converti ;
    - un circuit de commande automatique de gain (306) pour adapter le signal filtré;
    - un convertisseur analogique-numérique (307) pour numériser le signal adapté ;
    - un module de reconnaissance et de localisation de mésappariements d'impédance (308, 311) qui comprend :
    un premier bloc (101) configuré pour calculer un spectre du signal numérisé par le convertisseur analogique-numérique ;
    un deuxième bloc (102) configuré pour calculer un module du spectre du signal ;
    un troisième bloc (103) configuré pour réduire le bruit du module du spectre du signal ;
    un quatrième bloc (104) configuré pour la transformation du spectre du module à bruit réduit du spectre du signal, la transformation du spectre comprenant l'exécution d'une opération (1041, 1042) sur le module à bruit réduit à la puissance n-ième ;
    un cinquième bloc (105) configuré pour calculer une transformée de Fourier inverse (IFT) du module à réduction de bruit transformé du spectre du signal ;
    un sixième bloc (106) configuré pour calculer un module pour la puissance n-ième de la transformée de Fourier inverse (IFT) du module à bruit réduit transformé du spectre du signal ; et
    un septième bloc (108) configuré pour détecter et localiser des mésappariements d'impédance dans le réseau SMATV aux positions de maximums dans le module à puissance n-ième de la transformée de Fourier inverse du module à bruit réduit transformé du spectre du signal.
  2. Système selon la revendication 1, où une résolution spatiale de la reconnaissance, une bande passante utilisée et une plage de reconnaissance spatiale pour la reconnaissance et la localisation de mésappariements d'impédance peuvent être réglées.
  3. Système selon la revendication 1, comprenant en outre un huitième bloc pour effectuer une opération de normalisation (107) du module à la puissance n-ième de la transformée de Fourier inverse du module à bruit réduit transformé du spectre du signal (106), le système étant configuré pour comparer les mésappariements d'impédance détectées et localisées en différents points du réseau SMATV.
EP10015153.9A 2009-11-30 2010-11-30 Système de reconnaissance et de localisation d'adaptations erronées d'impédance Active EP2328288B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL10015153T PL2328288T3 (pl) 2009-11-30 2010-11-30 System wykrywania i lokalizowania niezgodności impedancji

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ES200902278A ES2380532A1 (es) 2009-11-30 2009-11-30 Sistema de deteccion y localizacion de desadaptaciones de impedancia.

Publications (2)

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EP2328288A1 EP2328288A1 (fr) 2011-06-01
EP2328288B1 true EP2328288B1 (fr) 2020-10-14

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EP (1) EP2328288B1 (fr)
ES (2) ES2380532A1 (fr)
PL (1) PL2328288T3 (fr)
PT (1) PT2328288T (fr)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117706255B (zh) * 2024-02-03 2024-04-12 深圳市思派乐电子有限公司 一种同轴电缆测试方法、装置以及系统

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5751766A (en) * 1995-04-27 1998-05-12 Applied Signal Technology, Inc. Non-invasive digital communications test system
US6687632B1 (en) * 1998-01-23 2004-02-03 Trilithic, Inc. Testing of CATV systems
US6437578B1 (en) 2000-11-14 2002-08-20 Tektronix, Inc. Cable loss correction of distance to fault and time domain reflectometer measurements
US6868357B2 (en) 2001-07-07 2005-03-15 Cynthia M. Furse Frequency domain reflectometry system for testing wires and cables utilizing in-situ connectors, passive connectivity, cable fray detection, and live wire testing
US6691051B2 (en) 2001-08-14 2004-02-10 Tektronix, Inc. Transient distance to fault measurement
US7215126B2 (en) 2002-11-19 2007-05-08 University Of Utah Research Foundation Apparatus and method for testing a signal path from an injection point
US7512503B2 (en) 2003-05-12 2009-03-31 Simmonds Precision Products, Inc. Wire fault detection

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
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Also Published As

Publication number Publication date
PT2328288T (pt) 2020-12-07
ES2380532A1 (es) 2012-05-16
EP2328288A1 (fr) 2011-06-01
ES2826987T3 (es) 2021-05-19
PL2328288T3 (pl) 2021-04-19

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