JP2005300546A - ケーブル障害測定のロスおよび散乱歪補正方法 - Google Patents
ケーブル障害測定のロスおよび散乱歪補正方法 Download PDFInfo
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- JP2005300546A JP2005300546A JP2005114112A JP2005114112A JP2005300546A JP 2005300546 A JP2005300546 A JP 2005300546A JP 2005114112 A JP2005114112 A JP 2005114112A JP 2005114112 A JP2005114112 A JP 2005114112A JP 2005300546 A JP2005300546 A JP 2005300546A
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- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000012937 correction Methods 0.000 title claims abstract description 21
- 238000005259 measurement Methods 0.000 title claims abstract description 20
- 239000006185 dispersion Substances 0.000 title abstract description 4
- 230000004044 response Effects 0.000 claims abstract description 30
- 230000006870 function Effects 0.000 claims description 19
- 238000012360 testing method Methods 0.000 claims description 14
- 230000009131 signaling function Effects 0.000 claims description 2
- 230000002238 attenuated effect Effects 0.000 abstract description 7
- 230000003111 delayed effect Effects 0.000 abstract description 4
- 230000000638 stimulation Effects 0.000 description 5
- 238000004364 calculation method Methods 0.000 description 3
- 239000004020 conductor Substances 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 238000013016 damping Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000013178 mathematical model Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000010363 phase shift Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000002310 reflectometry Methods 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 238000013024 troubleshooting Methods 0.000 description 1
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Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/11—Locating faults in cables, transmission lines, or networks using pulse reflection methods
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/02—Details
- H04B3/46—Monitoring; Testing
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/28—Measuring attenuation, gain, phase shift or derived characteristics of electric four pole networks, i.e. two-port networks; Measuring transient response
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Locating Faults (AREA)
- Measurement Of Resistance Or Impedance (AREA)
- Monitoring And Testing Of Transmission In General (AREA)
Abstract
【解決手段】ケーブル40を周波数ドメインで測定し、反射応答を求める。隣接する等しい長さの接続点を規定するポイントにおける振幅減衰および遅延位相を有する反射応答の部分正弦波成分を寄せ集めノーマライズする。次に、反射応答の部分正弦波成分を、各ポイントにおける真の値を数学的に計算してノーマライズされた合計から抽出し、ロスおよび散乱歪成分の全てを除去する。
【選択図】図4
Description
X(f)e−(α+jβ)n
で表すことができる。ここで、fは周波数であり、jは√−1(複素数)、nは正弦波信号がケーブルに沿って伝播する単位長の倍数である。ケーブルパラメータαおよびβは、周波数の関数であり、上記の式は、
X(f)e−(α(f)+jβ(f))n
と書き換えることができる。数学的には実数部および虚数部を含んでいる複素数であるα+jβは、γで表すこともでき、伝播定数と呼ばれている。
X(f)Γ(x)e−2Xγ(f)
で表される。
R(f)=Y(f)/X(f)=[Γ(0)+Γ(1)e−2Γ(f)+Γ(2)e−4Γ(f)+・・Γ(n)e−2nΓ(f)+・・Γ(N)e−2NΓ(f)]
R(f)e2γ(f)=[Γ(0)e2γ(f)+Γ(1)+Γ(2)e−2γ(f)+・・・Γ(n)e−2(n−1)Γ(f)+・・Γ(N)e−2(N−1)Γ(f)]
32 反射応答
34 補正されたパルス
40 ケーブル
X0〜Xn ケーブルの仮想接続ポイント
Claims (3)
- (a)被試験ケーブルを周波数ドメインで測定して前記ケーブルに送り込まれた信号の反射応答を得るステップ、
(b)前記ケーブルに沿って予め決められたポイントからの反射応答の一連の部分正弦波成分を集めて重ね合わされた関数を得るステップ、
(c)前記重ね合わされた関数を送られた信号関数で割り、ノーマライズされた関数を得るステップ、および
(d)前記ノーマライズされた関数から、前記予め決められた各ポイントにおける真の値を計算することにより部分正弦波成分を抽出して、減衰および散乱歪を除去するステップを備えることを特徴とするケーブル障害測定のロスおよび散乱歪補正方法。 - 前記抽出された部分正弦波成分のプロットをディスプレイするステップを更に備えることを特徴とする請求項1に記載のケーブル障害測定のロスおよび散乱歪補正方法。
- 前記ケーブルに沿う予め決められたポイントは、最高プロ−ビング周波数の周期により決定されることを特徴とする請求項1又は2に記載のケーブル障害測定のロスおよび散乱歪補正方法。
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/822,965 | 2004-04-12 | ||
US10/822,965 US7295018B2 (en) | 2004-04-12 | 2004-04-12 | Correction of loss and dispersion in cable fault measurements |
Publications (2)
Publication Number | Publication Date |
---|---|
JP2005300546A true JP2005300546A (ja) | 2005-10-27 |
JP4870939B2 JP4870939B2 (ja) | 2012-02-08 |
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Application Number | Title | Priority Date | Filing Date |
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JP2005114112A Active JP4870939B2 (ja) | 2004-04-12 | 2005-04-12 | ケーブル障害測定の減衰および散乱歪補正方法 |
Country Status (7)
Country | Link |
---|---|
US (1) | US7295018B2 (ja) |
JP (1) | JP4870939B2 (ja) |
KR (1) | KR101115368B1 (ja) |
DE (1) | DE102005014993B4 (ja) |
FR (1) | FR2868846B1 (ja) |
GB (1) | GB2413191B (ja) |
TW (1) | TWI373624B (ja) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2008096126A (ja) * | 2006-10-06 | 2008-04-24 | Hioki Ee Corp | 多芯ケーブル長測定装置 |
WO2015186429A1 (ja) * | 2014-06-03 | 2015-12-10 | 三菱電機株式会社 | 伝送ケーブル特性測定装置及び伝送ケーブル特性測定方法 |
Families Citing this family (15)
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US7057401B2 (en) * | 2004-03-23 | 2006-06-06 | Pass & Seymour, Inc. | Electrical wiring inspection system |
US8046207B2 (en) * | 2005-12-27 | 2011-10-25 | The Mathworks, Inc. | Digital effects analysis in modeling environments |
SE530525C2 (sv) * | 2006-09-29 | 2008-07-01 | Wavetech Sweden Ab | Förfarande och anordning för övervakning av ett system |
US7705761B2 (en) * | 2007-11-07 | 2010-04-27 | Lockheed Martin Corporation | System and method for wideband direct sampling and beamforming using complex analog to digital converter |
US8234324B2 (en) * | 2008-06-10 | 2012-07-31 | Lockheed Martin Corporation | Differential inverse aliasing digital to analog converter |
FR2981752B1 (fr) * | 2011-10-20 | 2013-11-08 | Commissariat Energie Atomique | Procede de reflectometrie pour la detection de defauts non francs dans un cable electrique et systeme mettant en oeuvre le procede |
FR2988855B1 (fr) * | 2012-04-03 | 2014-12-19 | Commissariat Energie Atomique | Procede et systeme de diagnostic d'un cable par reflectometrie distribuee a moyenne autoselective |
US8981791B2 (en) | 2013-05-02 | 2015-03-17 | Fluke Corporation | Adaptive frequency-domain windowing |
US10180485B2 (en) * | 2014-09-05 | 2019-01-15 | Leonid Matsiev | Performance and versatility of single-frequency DFT detectors |
US9846188B2 (en) | 2014-09-18 | 2017-12-19 | Fluke Corporation | Detecting, localizing and ranking copper connectors |
US10185020B1 (en) | 2015-12-22 | 2019-01-22 | Keysight Technologies, Inc. | Method of compensating loss and dispersion of transmission line for time domain reflectometry |
US11411606B2 (en) | 2016-03-24 | 2022-08-09 | Telefonaktiebolaget Lm Ericsson (Publ) | Method and system for estimating crosstalk between electrical transmission lines |
US10256872B2 (en) | 2017-05-02 | 2019-04-09 | Apple Inc. | Methods for performing antenna beam scanning |
EP3499802B1 (en) * | 2017-12-12 | 2021-01-20 | British Telecommunications public limited company | Cable network modelling |
DE102018219959A1 (de) * | 2018-11-21 | 2020-05-28 | Siemens Aktiengesellschaft | Verfahren und Messanordnung zur Fehlererkennung auf elektrischen Leitungen |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH09243699A (ja) * | 1996-02-12 | 1997-09-19 | Fluke Corp | テスト用計測器およびテスト用計測器においてクロストークパルス応答を処理するための方法 |
US6437578B1 (en) * | 2000-11-14 | 2002-08-20 | Tektronix, Inc. | Cable loss correction of distance to fault and time domain reflectometer measurements |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BE793428A (fr) | 1971-12-29 | 1973-04-16 | Western Electric Co | Dispositif de localisation de defauts sur une |
US5502391A (en) * | 1992-09-11 | 1996-03-26 | Microtest, Inc. | Apparatus for measuring the crosstalk in a cable |
US5570029A (en) * | 1994-03-30 | 1996-10-29 | Fluke Corporation | Cable crosstalk measurement system |
US5530367A (en) * | 1995-01-06 | 1996-06-25 | Fluke Corporaton | Pulse based cable attenuation measurement system |
US5751766A (en) | 1995-04-27 | 1998-05-12 | Applied Signal Technology, Inc. | Non-invasive digital communications test system |
US5633801A (en) | 1995-10-11 | 1997-05-27 | Fluke Corporation | Pulse-based impedance measurement instrument |
US6433558B1 (en) * | 1999-05-13 | 2002-08-13 | Microtest, Inc. | Method for diagnosing performance problems in cabling |
WO2002007419A2 (en) * | 2000-07-14 | 2002-01-24 | Vigilant Networks Llc | Tdr lan cables attenuation measurement |
US20030035376A1 (en) | 2001-08-20 | 2003-02-20 | Xiaofen Chen | Derivation of composite step-function response |
DE10146859A1 (de) | 2001-09-21 | 2003-05-22 | Willtek Comm Gmbh | Verfahren und Vorrichtung zur Lokalisierung eines Leitungsfehlers |
KR100486972B1 (ko) | 2002-07-09 | 2005-05-03 | 신용준 | 시간-주파수 영역 반사파 처리 방법 |
-
2004
- 2004-04-12 US US10/822,965 patent/US7295018B2/en not_active Expired - Lifetime
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2005
- 2005-03-30 TW TW094109951A patent/TWI373624B/zh not_active IP Right Cessation
- 2005-04-01 DE DE102005014993.6A patent/DE102005014993B4/de active Active
- 2005-04-06 GB GB0506946A patent/GB2413191B/en active Active
- 2005-04-11 KR KR1020050029778A patent/KR101115368B1/ko active IP Right Grant
- 2005-04-12 JP JP2005114112A patent/JP4870939B2/ja active Active
- 2005-04-12 FR FR0503620A patent/FR2868846B1/fr active Active
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH09243699A (ja) * | 1996-02-12 | 1997-09-19 | Fluke Corp | テスト用計測器およびテスト用計測器においてクロストークパルス応答を処理するための方法 |
US6437578B1 (en) * | 2000-11-14 | 2002-08-20 | Tektronix, Inc. | Cable loss correction of distance to fault and time domain reflectometer measurements |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2008096126A (ja) * | 2006-10-06 | 2008-04-24 | Hioki Ee Corp | 多芯ケーブル長測定装置 |
WO2015186429A1 (ja) * | 2014-06-03 | 2015-12-10 | 三菱電機株式会社 | 伝送ケーブル特性測定装置及び伝送ケーブル特性測定方法 |
JPWO2015186429A1 (ja) * | 2014-06-03 | 2017-04-20 | 三菱電機株式会社 | 伝送ケーブル特性測定装置及び伝送ケーブル特性測定方法 |
Also Published As
Publication number | Publication date |
---|---|
TW200604541A (en) | 2006-02-01 |
FR2868846A1 (fr) | 2005-10-14 |
DE102005014993B4 (de) | 2018-07-12 |
US20050225329A1 (en) | 2005-10-13 |
KR101115368B1 (ko) | 2012-02-15 |
FR2868846B1 (fr) | 2007-06-08 |
TWI373624B (en) | 2012-10-01 |
US7295018B2 (en) | 2007-11-13 |
JP4870939B2 (ja) | 2012-02-08 |
DE102005014993A1 (de) | 2005-12-22 |
KR20060047156A (ko) | 2006-05-18 |
GB0506946D0 (en) | 2005-05-11 |
GB2413191A (en) | 2005-10-19 |
GB2413191B (en) | 2007-10-10 |
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