CN111044936A - Airborne GJB289A bus cable fault rapid positioning method - Google Patents
Airborne GJB289A bus cable fault rapid positioning method Download PDFInfo
- Publication number
- CN111044936A CN111044936A CN201911193650.1A CN201911193650A CN111044936A CN 111044936 A CN111044936 A CN 111044936A CN 201911193650 A CN201911193650 A CN 201911193650A CN 111044936 A CN111044936 A CN 111044936A
- Authority
- CN
- China
- Prior art keywords
- bus
- cable
- section
- gjb289a
- messages
- Prior art date
- Legal status (The legal status 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 status listed.)
- Pending
Links
Images
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
- G01R31/005—Testing of electric installations on transport means
- G01R31/008—Testing of electric installations on transport means on air- or spacecraft, railway rolling stock or sea-going vessels
-
- 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
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/083—Locating faults in cables, transmission lines, or networks according to type of conductors in cables, e.g. underground
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Monitoring And Testing Of Transmission In General (AREA)
Abstract
The invention belongs to an airborne cable fault positioning method, and particularly relates to an airborne GJB289A bus cable fault rapid positioning method, which solves the problems that the existing GJB289A bus cable fault detection method is time-consuming and labor-consuming, and accidental faults under extreme conditions cannot be positioned. The method comprises the following steps: step one, drawing a logic topology structure diagram of a GJB289A bus; step two, segmenting the GJB289A bus trunk line A, the bus trunk line B and the branch line channels; thirdly, connecting the bus monitoring equipment to a monitoring port of the cable; step four, electrifying the operation processor, starting bus scheduling by the bus controller, sending bus messages one by one through the bus trunk line A, and judging whether a fault occurs; and step five, the bus controller starts bus scheduling, and bus messages are sent one by one through the bus trunk line B to judge whether a fault occurs.
Description
Technical Field
The invention belongs to an airborne cable fault positioning method, and particularly relates to an airborne GJB289A bus cable fault rapid positioning method.
Background
The GJB289A bus is the most widely used bus for military aircraft, and the GJB289A bus cable is laid on the aircraft during the final assembly of the aircraft, so that the random bodies have the same service life in the next 30 years of use. Therefore, maintenance of the onboard GJB289A bus cable is an important part of aircraft maintenance. The GJB289A bus cable often has faults of disconnection, shrinkage of a connector attached to the cable, reduction of a shielding function caused by cable abrasion and the like, the traditional troubleshooting method is very difficult, all equipment needs to be disassembled, and the impedance value between two points and the resistance between the two points are measured one by one through a special instrument, so that the method is time-consuming and labor-consuming, the test of the whole cable needs at least 4 hours, and in addition, the time for disassembling and assembling the equipment is added, the time of nearly one day is needed for measuring the cable once, and accidental faults under extreme conditions cannot be located. Therefore, the rapid and accurate positioning of the faults of the GJB289A bus cable is a difficult problem which needs to be solved in the current maintenance.
Disclosure of Invention
The invention aims to solve the problems that the conventional GJB289A bus cable fault detection method is time-consuming and labor-consuming and can not locate accidental faults under extreme conditions, and provides an airborne GJB289A bus cable fault rapid location method. According to the method, bus transmission information is combined with a real physical equipment topological structure through the characteristic of GJB289A bus information command response, the transmission path of the bus information on the topological structure is graphically displayed by analyzing the correct and wrong conditions of bus information transmission, the number of the error information and the correct information transmission is recorded simultaneously through different color identifications, and further the fault condition of a bus cable is rapidly positioned.
In order to achieve the purpose, the invention is realized by the following technical scheme:
an airborne GJB289A bus cable fault rapid positioning method comprises the following steps:
step one, extracting the relative position of each device on a GJB289A bus according to a wiring diagram of airborne GJB289A bus devices, and further drawing a logic topology structure diagram of the GJB289A bus;
segmenting the GJB289A bus trunk line A, the bus trunk line B and the branch line channel according to the obtained logical topology structure diagram, wherein the segmentation points of the bus trunk line A and the bus trunk line B are connection points with the branch line channel;
thirdly, connecting the bus monitoring equipment to a monitoring port of the cable;
step four, electrifying the operation processor, starting bus scheduling by the bus controller, and sending bus messages one by one through the bus trunk line A;
if the bus monitoring equipment monitors the messages sent by the bus controller, the section of cable is normal, the section of cable is marked as green, and the number of the messages which are normally transmitted is marked on each section of cable;
if the bus monitoring equipment cannot monitor the messages sent by the bus controller, the section of cable has a fault, the section of cable is marked to be red, and the number of messages transmitted in error is updated on the section of cable;
step five, the bus controller starts bus scheduling and sends bus messages one by one through a bus trunk line B;
if the bus monitoring equipment monitors the messages sent by the bus controller, the section of cable is normal, the section of cable is marked as green, and the number of the messages which are normally transmitted is marked on each section of cable;
and if the bus monitoring equipment cannot monitor the messages sent by the bus controller, the section of cable has a fault, the section of cable is marked to be red, and the number of the messages which are transmitted in error is updated on the section of cable.
Compared with the prior art, the technical scheme of the invention has the beneficial effects that:
the invention provides a method for quickly positioning the fault of an airborne GJB289A bus cable, after the cable is installed, the fault of a certain section of cable can be quickly positioned without dismantling airborne equipment and special instruments, the efficiency is high, the operation is simple, and the positioning is accurate; especially for faults caused by intermittent connection of the cable, the positioning can be quickly and accurately carried out.
Drawings
Fig. 1 is a bus topology structure diagram of a GJB289A according to an embodiment of the present invention;
fig. 2 is a diagram of bus cable segmentation and fault location of the GJB289A according to the embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the figures and the specific examples.
The invention provides a method for quickly positioning faults of an airborne GJB289A bus cable, and belongs to the field of use, measurement and maintenance of the airborne GJB289A bus cable. Different from the traditional GJB289A bus cable fault positioning method, the method does not need to use a special instrument to measure the impedance between the end points of two branch lines and the resistance between the two branch lines one by one, only needs one GJB289A bus monitoring device, abstracts the real topological structure of the bus from the physical installation position of the device, segments each cable in the topological structure, analyzes and graphically displays the message transmission condition of each segmented cable by utilizing the characteristic of GJB289A bus command response under the real-time operation condition of the GJB289A bus, carries out message quantity marking and green and red display, can measure the GJB289A bus cable connectivity in real time, and positions the fault of a certain section of branch line or trunk line.
The invention provides a method for quickly positioning faults of an airborne GJB289A bus cable, which comprises the following steps:
step one, extracting the relative position of each device on a GJB289A bus according to a wiring diagram of airborne GJB289A bus devices, and further drawing a logic topology structure diagram of the GJB289A bus;
segmenting the GJB289A bus trunk line A, the bus trunk line B and the branch line channel according to the obtained logical topology structure diagram, wherein the segmentation points of the bus trunk line A and the bus trunk line B are connection points with the branch line channel, namely segmenting according to two adjacent equipment trunk lines and corresponding branch lines thereof;
thirdly, connecting the bus monitoring equipment to a monitoring port of the cable;
step four, electrifying the operation processor, starting bus scheduling by the bus controller, and sending bus messages one by one through the bus trunk line A;
if the bus monitoring equipment monitors the messages sent by the bus controller, the section of cable is normal, the section of cable is marked as green, and the number of the messages which are normally transmitted is marked on each section of cable;
if the bus monitoring equipment cannot monitor the messages sent by the bus controller, the section of cable has a fault, the section of cable is marked to be red, and the number of messages transmitted in error is updated on the section of cable;
step five, the bus controller starts bus scheduling and sends bus messages one by one through a bus trunk line B;
if the bus monitoring equipment monitors the messages sent by the bus controller, the section of cable is normal, the section of cable is marked as green, and the number of the messages which are normally transmitted is marked on each section of cable;
and if the bus monitoring equipment cannot monitor the messages sent by the bus controller, the section of cable has a fault, the section of cable is marked to be red, and the number of the messages which are transmitted in error is updated on the section of cable.
The method for quickly positioning the fault of the airborne GJB289A bus cable is different from the traditional method for judging the fault of the cable by measuring the impedance of the GJB289A cable, the resistance parameters between the cables and the like, the fault of a certain section of the cable can be quickly positioned by monitoring the bus message and carrying out graphical analysis, and particularly for the installed cable, the method has the advantages of high fault troubleshooting efficiency, simplicity in operation and accuracy in positioning. The method comprises the steps of firstly forming a bus topology according to the physical positions of airborne equipment on a GJB289A bus, accessing bus monitoring equipment through a GJB289A bus monitoring port for monitoring messages transmitted on the bus in real time, graphically displaying the relationship between the bus messages and the bus topology, and drawing the communication condition of the bus on a topological structure in real time by utilizing the characteristic of GJB289A bus command response, so that the fault area of the bus can be quickly positioned.
As shown in fig. 1, the method of the present invention firstly needs to extract the relative position of each device on the GJB289A bus according to the wiring diagram of the onboard GJB289A bus device, and further draws the logical topology structure of the bus, wherein the system has 4 devices, namely, a processor, a backup processor (RT address is 18), a subsystem 1(RT address is 1), a subsystem 2(RT address is 2), the newly added bus monitoring device is connected to the monitoring port of the cable, and the topology structure of fig. 1 truly reflects the physical connection relationship and the relative position of each device on the bus.
Secondly, segmenting the relative positions of the bus trunk line of the GJB289A and the branch line A, B, and respectively marking serial numbers, segmenting according to two adjacent device trunk lines and corresponding branch lines thereof based on the topology structure of fig. 1, taking the a-channel cable segmentation in fig. 1 as an example, and the result is shown in fig. 2: the serial number of a cable between the processor and the channel of the trunk line A is marked as (1); the trunk cable between the processor and the bus monitoring device is marked (2); the cable between the bus monitoring device and the trunk a channel is marked (3); the cable between the bus monitoring device and the backup handler is marked (4); the cable between the backup handler and the trunk a channel is marked (5); the trunk cable between the backup handler and the subsystem 1 is marked (6); the cable between the subsystem 1 and the trunk a channel is marked (7); the trunk between subsystem 1 and subsystem 2 is marked (8); the cable between subsystem 2 and trunk a channel is marked (9).
When the onboard GJB289A bus cable is suspected to have a fault or routine monitoring needs to be carried out on the onboard GJB289A bus cable, the bus monitoring equipment is accessed into the bus network through a cable reservation monitoring port.
When the processor is powered on and operated, the Bus Controller (BC) starts bus scheduling, bus messages are sent one by one, and analysis is carried out by taking the channel A as an example, wherein the specific analysis method comprises the following steps:
if the bus monitoring equipment monitors the first messages BC to RT18 through the channel A of the bus monitor and the RT18 responds normally, which indicates that the cables in the sections (1) to (5) are normal, the part of the cables are marked as green, and the number of the messages which are normally transmitted is marked on each section of the cable;
if the bus monitoring equipment monitors a second message BC to RT2 through the channel A of the bus monitor and the RT2 responds normally, which indicates that the cables of the sections (1), (2), (3), (4), (6), (8) and (9) are normal, the part of the cables is marked to be green, and the number of messages which are normally transmitted on each section of the cables is updated;
if the bus monitoring device monitors the messages from the third BC to RT1 through the channel of the bus monitor A, but the RT1 responds to errors (assuming that the RT1 device works normally), and presumes that the cable in the section (7) can have faults according to the two messages, the color of the cable in the section (7) is marked to be red, and the number of the messages transmitted in errors is updated on the cable in the section (7).
By the analysis method similar to the above, after the operation for a period of time, it can be analyzed whether each cable can normally transmit data and the number of message errors occurring in the data transmission process, and the position of the cable with the channel a fault can be easily located by performing color identification on each cable through green and red, as shown in fig. 2.
Similarly, the channel A of the bus controller is unplugged, all messages are switched to be conducted to the channel B for transmission, and then the fault condition of the cable of the channel B can be tested;
according to the method, the bus connectivity is tested by utilizing the GJB289A bus command response characteristic according to the actual installation position of the equipment on the bus branch line, and the A, B channel cable test can be controlled to be completed within 10 minutes without disassembling the equipment, so that the test time is greatly saved, and the fault location and the upgrading maintenance of the airborne GJB289A bus cable are greatly facilitated.
Claims (1)
1. An airborne GJB289A bus cable fault rapid positioning method is characterized by comprising the following steps:
step one, extracting the relative position of each device on a GJB289A bus according to a wiring diagram of airborne GJB289A bus devices, and further drawing a logic topology structure diagram of the GJB289A bus;
segmenting the GJB289A bus trunk line A, the bus trunk line B and the branch line channel according to the obtained logical topology structure diagram, wherein the segmentation points of the bus trunk line A and the bus trunk line B are connection points with the branch line channel;
thirdly, connecting the bus monitoring equipment to a monitoring port of the cable;
step four, electrifying the operation processor, starting bus scheduling by the bus controller, and sending bus messages one by one through the bus trunk line A;
if the bus monitoring equipment monitors the messages sent by the bus controller, the section of cable is normal, the section of cable is marked as green, and the number of the messages which are normally transmitted is marked on each section of cable;
if the bus monitoring equipment cannot monitor the messages sent by the bus controller, the section of cable has a fault, the section of cable is marked to be red, and the number of messages transmitted in error is updated on the section of cable;
step five, the bus controller starts bus scheduling and sends bus messages one by one through a bus trunk line B;
if the bus monitoring equipment monitors the messages sent by the bus controller, the section of cable is normal, the section of cable is marked as green, and the number of the messages which are normally transmitted is marked on each section of cable;
and if the bus monitoring equipment cannot monitor the messages sent by the bus controller, the section of cable has a fault, the section of cable is marked to be red, and the number of the messages which are transmitted in error is updated on the section of cable.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911193650.1A CN111044936A (en) | 2019-11-28 | 2019-11-28 | Airborne GJB289A bus cable fault rapid positioning method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911193650.1A CN111044936A (en) | 2019-11-28 | 2019-11-28 | Airborne GJB289A bus cable fault rapid positioning method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111044936A true CN111044936A (en) | 2020-04-21 |
Family
ID=70233191
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911193650.1A Pending CN111044936A (en) | 2019-11-28 | 2019-11-28 | Airborne GJB289A bus cable fault rapid positioning method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111044936A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112433126A (en) * | 2020-09-22 | 2021-03-02 | 成都飞机工业（集团）有限责任公司 | Digital model-based quick positioning method for spatial position of fault after wiring harness installation |
| CN113759212A (en) * | 2021-08-31 | 2021-12-07 | 国网河北省电力有限公司检修分公司 | Alarm system for high-voltage bus |
| CN113810246A (en) * | 2021-09-01 | 2021-12-17 | 国营芜湖机械厂 | Portable GJB-289A test equipment, test method and fault detection method |
| CN114095297A (en) * | 2021-09-08 | 2022-02-25 | 中国航空工业集团公司西安航空计算技术研究所 | Method for quickly positioning faults of airborne 1394B bus cable |
Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6973668B1 (en) * | 1998-06-30 | 2005-12-06 | Cisco Technology, Inc. | Method and apparatus for locating a faulty component in a cable television system having cable modems |
| CN102901908A (en) * | 2012-09-15 | 2013-01-30 | 国家电网公司 | Cable operation information monitoring system and implement method thereof |
| CN103490959A (en) * | 2013-10-10 | 2014-01-01 | 北京航天发射技术研究所 | Dual-redundancy CAN bus fault detection method |
| CN103837801A (en) * | 2014-03-26 | 2014-06-04 | 国家电网公司 | Power distribution network fault locating system and method |
| CN104270268A (en) * | 2014-09-28 | 2015-01-07 | 曙光信息产业股份有限公司 | Network performance analysis and fault diagnosis method of distributed system |
| CN104536858A (en) * | 2015-01-04 | 2015-04-22 | 中国科学院光电技术研究所 | Method for automatically testing remote terminal in 1553B bus communication |
| CN104601383A (en) * | 2015-02-09 | 2015-05-06 | 国网四川省电力公司成都供电公司 | Segmented power telecommunication network analysis method |
| CN205103324U (en) * | 2015-06-15 | 2016-03-23 | 珠海欧比特控制工程股份有限公司 | 1553B data bus detector |
| CN105573941A (en) * | 2014-10-11 | 2016-05-11 | 中国航空工业集团公司西安飞机设计研究所 | Multi-source data synthesizing method |
| CN105764081A (en) * | 2014-12-17 | 2016-07-13 | 中兴通讯股份有限公司 | Method for detecting communication link, base station, web master and system |
| CN106452843A (en) * | 2016-09-14 | 2017-02-22 | 北京控制工程研究所 | On-orbit fault monitoring and diagnosing method for 1553B bus network |
| WO2017219318A1 (en) * | 2016-06-23 | 2017-12-28 | 华为技术有限公司 | Cm and hfc network fault locating system and fault detection method |
| CN208691266U (en) * | 2018-06-13 | 2019-04-02 | 天利航空科技深圳有限公司 | A kind of bus tester of airborne equipment |
-
2019
- 2019-11-28 CN CN201911193650.1A patent/CN111044936A/en active Pending
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6973668B1 (en) * | 1998-06-30 | 2005-12-06 | Cisco Technology, Inc. | Method and apparatus for locating a faulty component in a cable television system having cable modems |
| CN102901908A (en) * | 2012-09-15 | 2013-01-30 | 国家电网公司 | Cable operation information monitoring system and implement method thereof |
| CN103490959A (en) * | 2013-10-10 | 2014-01-01 | 北京航天发射技术研究所 | Dual-redundancy CAN bus fault detection method |
| CN103837801A (en) * | 2014-03-26 | 2014-06-04 | 国家电网公司 | Power distribution network fault locating system and method |
| CN104270268A (en) * | 2014-09-28 | 2015-01-07 | 曙光信息产业股份有限公司 | Network performance analysis and fault diagnosis method of distributed system |
| CN105573941A (en) * | 2014-10-11 | 2016-05-11 | 中国航空工业集团公司西安飞机设计研究所 | Multi-source data synthesizing method |
| CN105764081A (en) * | 2014-12-17 | 2016-07-13 | 中兴通讯股份有限公司 | Method for detecting communication link, base station, web master and system |
| CN104536858A (en) * | 2015-01-04 | 2015-04-22 | 中国科学院光电技术研究所 | Method for automatically testing remote terminal in 1553B bus communication |
| CN104601383A (en) * | 2015-02-09 | 2015-05-06 | 国网四川省电力公司成都供电公司 | Segmented power telecommunication network analysis method |
| CN205103324U (en) * | 2015-06-15 | 2016-03-23 | 珠海欧比特控制工程股份有限公司 | 1553B data bus detector |
| WO2017219318A1 (en) * | 2016-06-23 | 2017-12-28 | 华为技术有限公司 | Cm and hfc network fault locating system and fault detection method |
| CN106452843A (en) * | 2016-09-14 | 2017-02-22 | 北京控制工程研究所 | On-orbit fault monitoring and diagnosing method for 1553B bus network |
| CN208691266U (en) * | 2018-06-13 | 2019-04-02 | 天利航空科技深圳有限公司 | A kind of bus tester of airborne equipment |
Non-Patent Citations (4)
| Title |
|---|
| JUN LI: "Simulation and analysis of power cable fault and transient message for offshore wind farms", 《2011 INTERNATIONAL CONFERENCE ON CONSUMER ELECTRONICS, COMMUNICATIONS AND NETWORKS (CECNET)》 * |
| 曾晓东: "1553B总线通信过程中的通道切换策略研究", 《信息通信》 * |
| 汪浩: "基于1553B总线模块故障诊断系统的研究", 《计算机产品与流通》 * |
| 王研: "1553B总线现场测试仪的研究及设计", 《中国优秀硕士学位论文全文数据库 信息科技辑》 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112433126A (en) * | 2020-09-22 | 2021-03-02 | 成都飞机工业（集团）有限责任公司 | Digital model-based quick positioning method for spatial position of fault after wiring harness installation |
| CN112433126B (en) * | 2020-09-22 | 2022-05-10 | 成都飞机工业（集团）有限责任公司 | Digital model-based quick positioning method for spatial position of fault after wiring harness installation |
| CN113759212A (en) * | 2021-08-31 | 2021-12-07 | 国网河北省电力有限公司检修分公司 | Alarm system for high-voltage bus |
| CN113810246A (en) * | 2021-09-01 | 2021-12-17 | 国营芜湖机械厂 | Portable GJB-289A test equipment, test method and fault detection method |
| CN114095297A (en) * | 2021-09-08 | 2022-02-25 | 中国航空工业集团公司西安航空计算技术研究所 | Method for quickly positioning faults of airborne 1394B bus cable |
| CN114095297B (en) * | 2021-09-08 | 2023-09-01 | 中国航空工业集团公司西安航空计算技术研究所 | Rapid positioning method for airborne 1394B bus cable faults |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111044936A (en) | Airborne GJB289A bus cable fault rapid positioning method | |
| US10230459B2 (en) | System and method for optical time-domain reflectometry and design data wire testing | |
| JP2008267987A (en) | System and method for testing control cable | |
| CN104090252B (en) | Comprehensive detecting system and method for cable type fault indicator | |
| CN112858952B (en) | Rapid detection device and method for cable connectivity | |
| CN112595923A (en) | Positioning method for single-phase disconnection fault section of ungrounded system of power distribution network | |
| CN107271854B (en) | Dual-redundancy equipotential cable network mixed wire testing device and testing method | |
| CN111413596A (en) | Cable partial discharge positioning method and device, electronic equipment and positioning system | |
| CN108983019A (en) | Cable continuity test method, apparatus and test equipment | |
| CN110545140B (en) | Optical cable fault point approaching positioning method | |
| CN106452880B (en) | Network wiring detection method and device | |
| CN112433126B (en) | Digital model-based quick positioning method for spatial position of fault after wiring harness installation | |
| CN207782829U (en) | The diagnostic device of PROFIBUS-DP communication networks | |
| CN117278114A (en) | Power communication optical cable network operation and maintenance method and device and nonvolatile storage medium | |
| CN110888011B (en) | In-situ test method and test device based on testability modeling | |
| CN104765024A (en) | Onboard radar jamming automatic detection system | |
| CN104319887A (en) | Optical fiber chain scission anomaly judgment method for intelligent transformer substation | |
| CN108961738B (en) | Detection equipment and detection method for water meter of Internet of things | |
| CN114095297B (en) | Rapid positioning method for airborne 1394B bus cable faults | |
| EP2945035A1 (en) | Method and system for detecting and locating one or more wiring defect in dedicated aircraft systems | |
| CN221487722U (en) | Optical cable general investigation positioning system based on optical time domain reflectometer | |
| CN110162017B (en) | Vehicle LIN bus communication information abnormity diagnosis system and method | |
| CN113740663B (en) | Airplane installed cable fault positioning method based on impedance characteristics | |
| CN109490700A (en) | A kind of connector full signal test device and test method | |
| CN116148720B (en) | Aviation cable line damage investigation method based on capacitance accurate measurement |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200421 |
|
| RJ01 | Rejection of invention patent application after publication |