CN111060065A - High-precision deformation monitoring and comprehensive utilization algorithm for communication steel tower - Google Patents

High-precision deformation monitoring and comprehensive utilization algorithm for communication steel tower Download PDF

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Publication number
CN111060065A
CN111060065A CN201911384920.7A CN201911384920A CN111060065A CN 111060065 A CN111060065 A CN 111060065A CN 201911384920 A CN201911384920 A CN 201911384920A CN 111060065 A CN111060065 A CN 111060065A
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China
Prior art keywords
steel tower
different
communication
communication steel
displacement
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CN201911384920.7A
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Chinese (zh)
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汤碧红
张忠兵
宋长会
杨建虹
任新生
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汤碧红
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Priority to CN201911384920.7A priority Critical patent/CN111060065A/en
Publication of CN111060065A publication Critical patent/CN111060065A/en
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01BMEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B21/00Measuring arrangements or details thereof in so far as they are not adapted to particular types of measuring means of the preceding groups
    • G01B21/32Measuring arrangements or details thereof in so far as they are not adapted to particular types of measuring means of the preceding groups for measuring the deformation in a solid
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01CMEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
    • G01C1/00Measuring angles
    • G01C1/02Theodolites
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01CMEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
    • G01C5/00Measuring height; Measuring distances transverse to line of sight; Levelling between separated points; Surveyors' levels
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01PMEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P13/00Indicating or recording presence, absence, or direction, of movement
    • G01P13/02Indicating direction only, e.g. by weather vane
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01PMEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P5/00Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01SRADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S19/00Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
    • G01S19/38Determining a navigation solution using signals transmitted by a satellite radio beacon positioning system
    • G01S19/39Determining a navigation solution using signals transmitted by a satellite radio beacon positioning system the satellite radio beacon positioning system transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
    • G01S19/42Determining position

Abstract

A communication steel tower high-precision deformation monitoring and comprehensive utilization algorithm in the technical field of communication steel towers comprises the following steps: firstly, establishing models of different steel tower types with lateral displacement influenced by wind speed according to different steel tower design drawings; secondly, configuring the type or the installation point of the steel tower according to the actual field installation condition; thirdly, real data related to horizontal displacement, horizontal displacement direction, verticality and foundation settlement of the communication steel tower are obtained in real time; fourthly, the data are uploaded to a cloud platform, big data analysis is carried out on the cloud platform, and different threshold curves of different steel tower wind speeds/transverse displacements, included angles between the transverse displacement directions and railway lines and distance relations between the transverse displacement directions and the railway lines/verticality and different levels are obtained; and fifthly, according to the threshold curves of different grades, different alarm grades are given, and false alarms are reduced. The invention not only pays attention to the accuracy of the measurement of the steel tower, but also considers the factors of wind speed influence, the direction of the transverse displacement of the steel tower and the relationship between the position of the steel tower and the railway line. The invention has high measurement precision and low false alarm rate.

Description

High-precision deformation monitoring and comprehensive utilization algorithm for communication steel tower
Technical Field
The invention relates to a deformation monitoring method in the technical field of communication steel towers, in particular to a high-precision deformation monitoring and comprehensive utilization algorithm for a communication steel tower with a wind speed and direction sensor.
Background
The communication steel tower belongs to a signal transmitting tower, also called a signal transmitting tower or a signal tower, mainly has the function of supporting signal transmission, is used for supporting a signal transmitting antenna and is used for communication departments such as a mobile/communication/traffic satellite positioning system (GPS) and the like. The communication steel tower is composed of tower body, platform, lightning rod, ladder stand, antenna support and other steel members, and is subjected to hot galvanizing and anticorrosive treatment, and is mainly used for transmission and emission of microwave, ultrashort wave and wireless network signals. In order to ensure the normal operation of the wireless communication system, the communication antenna is generally disposed at the highest point to increase the service radius, so as to achieve the desired communication effect. The communication antenna needs a communication tower to increase the height, so the communication steel tower plays an important role in a communication network system.
With the acceleration of high-speed rail construction and the increase of high-speed rail speed, the railway communication steel tower is an essential infrastructure along the railway. The railway communication steel tower is generally built in an open area, the height is high, and the wind speed is high, so that the railway communication steel tower is easy to deform. Considering the structural characteristics of the communication steel tower, the transverse displacement is easily influenced by the wind speed in the deformation monitoring process, and different steel towers are affected by the wind speed inconsistently, so that the false alarm phenomenon is easily caused. The existing communication steel tower deformation measuring method and patent mainly pay attention to the accuracy of the measurement of the steel tower, and the factor of wind speed influence is not or rarely considered.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a high-precision deformation monitoring and comprehensive utilization algorithm for a communication steel tower, which not only pays attention to the accuracy of the measurement of the steel tower, but also considers the factor of wind speed influence, and has high measurement precision and low false alarm rate.
The invention is realized by the following technical scheme, and the invention comprises the following steps: firstly, establishing models of different steel tower types with lateral displacement influenced by wind speed according to different steel tower design drawings; secondly, configuring the type or the installation point of the steel tower according to the actual field installation condition; thirdly, real data related to horizontal displacement, verticality and foundation settlement of the communication steel tower are obtained in real time; fourthly, uploading the data to a cloud platform, and carrying out big data analysis on the cloud platform to obtain different threshold curves of different steel tower wind speeds, transverse displacement and verticality in different levels; and fifthly, according to the threshold curves of different grades, different alarm grades are given, and false alarms are reduced.
Further, in the invention, the acquisition of the real data related to the horizontal displacement, the verticality and the foundation settlement of the communication steel tower is realized by the following steps: firstly, arranging a differential satellite positioning measuring point at the bottom of a communication steel tower, arranging a differential satellite positioning measuring point at the top of the communication steel tower, arranging a wind speed and direction sensor at the top of the communication steel tower, and arranging a differential satellite positioning measuring point on the basis of an RTK base station; secondly, respectively obtaining longitude and latitude and altitude data of a steel tower monitoring point and a steel tower foundation monitoring point through a differential RTK and a positioning service/or a base station; thirdly, calculating to obtain a horizontal displacement value and a vertical settlement value of the communication steel tower; fourthly, acquiring the direction of the rail through a map; and fifthly, judging whether the state of the steel tower and the threshold value are effective at that time through data obtained by the wind speed and direction sensor.
Further, in the practical application of the invention, giving different alarm levels and reducing false alarms are realized by the following steps: firstly, acquiring different monitoring points, different types of steel tower wind speeds and transverse displacement in real time; secondly, a control threshold curve is called; thirdly, looking up a table and interpolating to obtain the current transverse displacement safety level of each monitoring point: safety/warning/dangerous/very dangerous; fourthly, carrying out corresponding processing according to the current security level: sending short messages, giving alarm prompts and marking different safety levels on the map by different colors/sizes.
Compared with the prior art, the invention has the following beneficial effects: the invention has reasonable design and effective method; the established model has higher precision and low false alarm rate.
Drawings
FIG. 1 is a flow chart of model building in the present invention;
FIG. 2 is a flow chart of a utility model in a practical application of the present invention;
FIG. 3 is a schematic structural diagram of an embodiment of the present invention;
FIG. 4 is a horizontal direction shift algorithm 1 according to an embodiment of the present invention;
FIG. 5 is a horizontal direction shift algorithm 2 according to an embodiment of the present invention;
FIG. 6 is a computational flow diagram of an embodiment of the present invention;
the reference numbers in the drawings are respectively: 1. the system comprises a communication steel tower, 2, a first differential satellite positioning measuring point, 3, a second differential satellite positioning measuring point, 4, a wind speed and direction sensor, 5, an RTK base station foundation and 6, and a differential satellite positioning RTK base station.
Detailed Description
The following embodiments of the present invention are described in detail with reference to the accompanying drawings, and the embodiments and specific operations of the embodiments are provided on the premise of the technical solution of the present invention, but the scope of the present invention is not limited to the following embodiments.
Examples
Embodiment as shown in fig. 1 to 6, the invention comprises a communication steel tower 1, a first differential satellite positioning measuring point 2, a second differential satellite positioning measuring point 3, a wind speed and direction sensor 4, an RTK base station foundation 5 and a differential satellite positioning RTK base station 6, wherein the first differential satellite positioning measuring point 2 is arranged at the bottom of the communication steel tower 1 and is defined as a measuring point one, and a differential satellite positioning mobile station is arranged, and the coordinates defined in an earth coordinate system are (X1, Y1, Z1); a second differential satellite positioning measuring point 3 is arranged at the top of the communication steel tower 1, is defined as a measuring point two, is used for placing a differential satellite positioning mobile station, and is defined as coordinates (X2, Y2 and Z2) in a geodetic coordinate system; the wind speed and direction sensor 4 is arranged at the top of the communication steel tower 1; the differential satellite positioning RTK base station 6 is disposed on top of the RTK base station base 5, and has coordinates defined within the geodetic coordinate system as (X0, Y0, Z0).
As shown in fig. 4, algorithm 1 for horizontal shift is:
the newly-built steel tower is understood to be completely vertical to the ground after adjustment is completed, and the horizontal components of the Beidou differential position sensors at the tower bottom and the tower top are A1(X1, Y1) and B1(X2, Y2); the coordinates of the horizontal direction components of the Beidou differential position sensors at the tower bottom and the tower top are respectively A1 '(X1', Y1 '), B1' (X2 ', Y2'); the horizontal displacement is a vector
Modulus of vectorDefined as the displacement value in the horizontal direction. The direction of the vector is defined as the deflection direction of the iron tower.
The height H of the steel tower is Z2-Z1, the verticality is the displacement value/H in the horizontal direction, and the basic settlement is the amount that the Z1 value becomes smaller along with the change of time.
As shown in fig. 5, algorithm 2 for horizontal shift is:
after the newly-built steel tower is adjusted, the newly-built steel tower is understood to be completely vertical to the ground, the horizontal component of the tower top Beidou differential position sensor is B1(X2, Y2), and the horizontal component of the tower top Beidou differential position sensor becomes B1 ' (X2 ', Y2 ') along with the time; the horizontal displacement is a vectorModulus of vectorDefined as the displacement value in the horizontal direction. The direction of the vector is defined as the deflection direction of the iron tower.
The height H of the steel tower is Z2-Z1, the verticality is the displacement value/H in the horizontal direction, and the basic settlement is the amount that the Z1 value becomes smaller along with the change of time.
The specific implementation process is shown in FIG. 6, measurement of a measuring point I, a measuring point II, an RTK base station and wind speed and direction is started at the same time, transverse displacement (perpendicularity) and wind speed data are obtained at high speed through a Beidou/GPS/GNSS RTK centimeter-level high-precision differential positioning technology, time/wind speed/displacement data are obtained through calculation of a lower computer and are uploaded to a cloud platform, big data analysis is carried out on the cloud platform, and threshold curves of different steel tower wind speeds/transverse displacement (perpendicularity) in different levels are obtained; in actual use, the measured values of the wind speed/the transverse displacement (verticality) of the steel tower at different positions are collected, the obtained threshold curves are compared, different alarm levels are given, and false alarms are reduced.
The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.

Claims (4)

1. The high-precision deformation monitoring and comprehensive utilization algorithm for the communication steel tower is characterized by comprising the following steps of:
firstly, establishing models of different steel tower types with lateral displacement influenced by wind speed according to different steel tower design drawings;
secondly, configuring the type or the installation point of the steel tower according to the actual field installation condition;
thirdly, real data related to horizontal displacement, verticality and foundation settlement of the communication steel tower are obtained in real time;
fourthly, uploading the data to a cloud platform, and carrying out big data analysis on the cloud platform to obtain different threshold curves of different steel tower wind speeds, transverse displacement and verticality in different levels;
and fifthly, according to the threshold curves of different grades, different alarm grades are given, and false alarms are reduced.
2. The algorithm for monitoring high-precision deformation and comprehensively utilizing the communication steel tower as claimed in claim 1, wherein the obtaining of the real data related to the horizontal displacement, the verticality and the foundation settlement of the communication steel tower is realized by the following steps:
firstly, arranging a differential satellite positioning measuring point at the bottom of a communication steel tower, arranging a differential satellite positioning measuring point at the top of the communication steel tower, arranging a wind speed and direction sensor at the top of the communication steel tower, and arranging a differential satellite positioning measuring point on the basis of an RTK base station;
secondly, respectively obtaining longitude and latitude and altitude data of a steel tower monitoring point and a steel tower foundation monitoring point through a differential RTK and a positioning service/or a base station;
thirdly, calculating to obtain a horizontal displacement value, a horizontal displacement direction and a vertical settlement value of the communication steel tower;
fourthly, acquiring the direction of the rail through a map;
and fifthly, judging whether the state of the steel tower and the threshold value are effective at the time through data obtained by the wind speed and direction sensor and an included angle between the rail direction and the horizontal displacement direction.
3. The algorithm for monitoring high-precision deformation and comprehensively utilizing communication steel towers according to claim 1, wherein the giving of different alarm levels and the reduction of false alarms are realized by the following steps:
firstly, acquiring wind speeds, transverse displacements and transverse displacement directions of different monitoring points and different types of steel towers in real time;
secondly, a control threshold curve is called;
thirdly, looking up a table and interpolating to obtain the current transverse displacement of each monitoring point and the included angle relative to the rail direction and the like to obtain the safety level: safety/warning/dangerous/very dangerous;
fourthly, carrying out corresponding processing according to the current security level: sending short messages, giving alarm prompts and marking different safety levels on the map by different colors/sizes.
4. The algorithm for monitoring high-precision deformation and comprehensively utilizing the communication steel tower as claimed in claim 1, wherein the obtaining of the real horizontal displacement of the communication steel tower can be realized only by arranging a differential satellite positioning measuring point at the top of the communication steel tower.
CN201911384920.7A 2019-12-28 2019-12-28 High-precision deformation monitoring and comprehensive utilization algorithm for communication steel tower Pending CN111060065A (en)

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Citations (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102852166A (en) * 2012-04-25 2013-01-02 青海省电力公司检修公司 On-line monitoring system and method for high-altitude frozen soil layer power transmission line iron tower foundation
CN103063255A (en) * 2012-12-28 2013-04-24 北京世纪东方国铁科技股份有限公司 Monitoring method and system of communication tower
CN203148460U (en) * 2012-12-24 2013-08-21 上海辉格科技发展有限公司 Iron tower monitoring system
CN203364874U (en) * 2013-05-22 2013-12-25 上海辉顿导航技术有限公司 Iron tower monitoring system based on combination of multi sensors
CN103809537A (en) * 2012-11-09 2014-05-21 石家庄市世纪电通通信技术有限公司 Method, device and system for railway tower safety monitoring
CN104268791A (en) * 2014-08-21 2015-01-07 国家电网公司华中分部 Health assessment method for 500 kV high-voltage power transmission line in mountain land occurrence environment
CN104915534A (en) * 2014-11-25 2015-09-16 国家电网公司 Deformation analysis and decision-making method of electric power tower based on sequence learning
CN104913743A (en) * 2014-11-25 2015-09-16 国家电网公司 Electric power iron tower deformation monitoring method based on inertia measurement
CN105091857A (en) * 2015-07-16 2015-11-25 通号通信信息集团有限公司 Iron tower state detection method and system
CN105468876A (en) * 2015-12-28 2016-04-06 国网山东省电力公司经济技术研究院 Real-time online evaluation method and system for safety state of power transmission tower
CN105510065A (en) * 2015-11-26 2016-04-20 青岛中天斯壮科技有限公司 Structure safety monitoring technology for steel-structure radio and television transmitting tower
CN105843151A (en) * 2016-06-16 2016-08-10 国网江苏省电力公司电力科学研究院 Remote safety monitoring system for power transmission tower
CN205540176U (en) * 2016-04-01 2016-08-31 北京梅泰诺通信技术股份有限公司 Communication tower remote monitering system
CN106679625A (en) * 2016-12-05 2017-05-17 安徽继远软件有限公司 High-precision deformation monitoring method of wide-area electric iron tower based on Beidou system
WO2019152234A2 (en) * 2018-01-30 2019-08-08 Valmont Industries, Inc. System and method for gps alignment using real-time kinetics
CN110132121A (en) * 2019-05-10 2019-08-16 国网浙江省电力有限公司信息通信分公司 The transmission tower deformation monitoring method of the non-combined RTK positioning of No. three double frequencies of Beidou
CN110298101A (en) * 2019-06-24 2019-10-01 国网浙江省电力有限公司电力科学研究院 A kind of transmission line of electricity wind-excited responese finite element method coupling wind system

Patent Citations (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102852166A (en) * 2012-04-25 2013-01-02 青海省电力公司检修公司 On-line monitoring system and method for high-altitude frozen soil layer power transmission line iron tower foundation
CN103809537A (en) * 2012-11-09 2014-05-21 石家庄市世纪电通通信技术有限公司 Method, device and system for railway tower safety monitoring
CN203148460U (en) * 2012-12-24 2013-08-21 上海辉格科技发展有限公司 Iron tower monitoring system
CN103063255A (en) * 2012-12-28 2013-04-24 北京世纪东方国铁科技股份有限公司 Monitoring method and system of communication tower
CN203364874U (en) * 2013-05-22 2013-12-25 上海辉顿导航技术有限公司 Iron tower monitoring system based on combination of multi sensors
CN104268791A (en) * 2014-08-21 2015-01-07 国家电网公司华中分部 Health assessment method for 500 kV high-voltage power transmission line in mountain land occurrence environment
CN104915534A (en) * 2014-11-25 2015-09-16 国家电网公司 Deformation analysis and decision-making method of electric power tower based on sequence learning
CN104913743A (en) * 2014-11-25 2015-09-16 国家电网公司 Electric power iron tower deformation monitoring method based on inertia measurement
CN105091857A (en) * 2015-07-16 2015-11-25 通号通信信息集团有限公司 Iron tower state detection method and system
CN105510065A (en) * 2015-11-26 2016-04-20 青岛中天斯壮科技有限公司 Structure safety monitoring technology for steel-structure radio and television transmitting tower
CN105468876A (en) * 2015-12-28 2016-04-06 国网山东省电力公司经济技术研究院 Real-time online evaluation method and system for safety state of power transmission tower
CN205540176U (en) * 2016-04-01 2016-08-31 北京梅泰诺通信技术股份有限公司 Communication tower remote monitering system
CN105843151A (en) * 2016-06-16 2016-08-10 国网江苏省电力公司电力科学研究院 Remote safety monitoring system for power transmission tower
CN106679625A (en) * 2016-12-05 2017-05-17 安徽继远软件有限公司 High-precision deformation monitoring method of wide-area electric iron tower based on Beidou system
WO2019152234A2 (en) * 2018-01-30 2019-08-08 Valmont Industries, Inc. System and method for gps alignment using real-time kinetics
CN110132121A (en) * 2019-05-10 2019-08-16 国网浙江省电力有限公司信息通信分公司 The transmission tower deformation monitoring method of the non-combined RTK positioning of No. three double frequencies of Beidou
CN110298101A (en) * 2019-06-24 2019-10-01 国网浙江省电力有限公司电力科学研究院 A kind of transmission line of electricity wind-excited responese finite element method coupling wind system

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
赵东丽、李冠: "基于高精度北斗定位在铁路通信基塔的应用研究", 《科技展望》 *

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