CN102944205A - Static calibration method of continuous linear measurement system - Google Patents
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Abstract
本发明提出了一种连续线形测量系统的静态校正方法。该方法在被测路段放置静态标定桥，利用长度测量工具测得桥高；采用连续线形测量系统对含有标定桥的路段进行检测，通过线形计算得到含有标定桥的线形曲线，从线形曲线中得到标定桥的计算桥高，将此计算桥高与实际测得的桥高对比，得到纵轴坐标修正系数，利用该系数修正整体测量线形曲线，进而提高线形测量精度。本发明适用于道路交通领域中各类公路、桥梁和隧道的连续线形检测。
The invention proposes a static correction method for a continuous line shape measurement system. In this method, a static calibration bridge is placed on the measured road section, and the bridge height is measured by a length measurement tool; the continuous linear measurement system is used to detect the road section containing the calibration bridge, and the linear curve containing the calibration bridge is obtained through linear calculation. Calibrate the calculated bridge height of the bridge, compare the calculated bridge height with the actual measured bridge height, and obtain the vertical axis coordinate correction coefficient, and use this coefficient to correct the overall measurement linear curve, thereby improving the linear measurement accuracy. The invention is suitable for continuous alignment detection of various roads, bridges and tunnels in the field of road traffic.
Description
Technical field
The present invention relates to the bearing calibration of the structural linetype detection system in all kinds of highways, bridge and tunnel in the road traffic field.
Background technology
The deformation monitoring bridge of highway subgrade and the deformation monitoring in tunnel are most important for the structural safety that guarantees traffic engineering.Weak soil ground roadbed is easy to occur the problem on deformation such as sedimentation, mismatch in the highway.Common detection means can't satisfy high-precision length apart from pilot measurement.Bridge structure can produce distortion under external force, and various disease such as crack, loss of prestress etc. finally also cause bridge linear to change, and linear displacement is to judge the most important of bridge security and reference index intuitively.The tunnel is in long-term operation and use procedure, and the safety problem of being concerned about most prevents that exactly the tunnel from caving in, and timely fast assurance tunnel is the important process of guaranteeing the tunnel operation security along the circumferential deformation in journey trend and the relatively poor zone of wall rock condition.
The deformation monitoring in road traffic field must meet corresponding national evaluation criteria to accuracy requirement.For example in the at present common stayed-cable bridge, if main span is respectively steel tank tower stiff girder, prestressed concrete beam and Steel Truss Stiffening Girder, mid-span deflection maximum allow to be deformed into strides 1/400,1/500 and 1/800 of footpath.Be 500m if stride the footpath, then above-mentioned bridge mid-span deflection maximum permissible value is respectively 1.25m, 1m and 0.625m.Yet annual observation data shows to only have the 2-3 millimeter every year for the large bridge main span span centre downwarp that lower flexure strain trend is arranged, downwarp even only have the 1-2 millimeter in the middle-size and small-size bridge span.Accordingly, to the accuracy requirement of linear measurement system in the millimeter magnitude.
The linear detection conventional method in highway, bridge and tunnel mainly adopts optical instrument to measure by setting up level-control net, and long term monitoring mainly adopts the novel test methods such as communicating pipe test macro, laser measurement system, photoelectric image formula measuring system and GPS method.
Level-control net set up the engineering complexity, length consuming time, affected by environment larger.Communicating pipe, test macro obtained the deflection value of each measuring point by the liquid level pressure differential of measuring each measuring point and reference point.Not only need to overlay water pipe, and it is slow in use to exist the response time, the shortcomings such as construction and maintenance cost height.Laser measurement system and photoelectric image formula measuring system mainly are the relative position variations that draws light source by the change in location of optical system seizure hot spot or imaging.It is as a reference point that these two kinds of measuring systems all must be installed fixed equipment at bridge, can't obtain initial measuring basis state behind equipment moving, can't satisfy long-term measurement requirement, and the Different climate condition is influential to measuring.
The GPS technology receives the three-dimensional coordinate of the carrier phase differential data the real time measure website of Navsat, is a kind of novel Real-time Measuring Technique.It is little that GPS is affected by ambient atmosphere, can monitor in storm, can realize the automatic monitoring of three-dimensional coordinate.Yet this technology exists the shortcoming that vertical vertical accuracy is relatively poor, can't reach millimeter precision, and cost is high, can't carry out on a large scale application.When carrying out the accurate metering system of multiple spot in addition, require every static test duration longer, test is slow.
Also owing to coming the amount of deflection of match detected object linear by measuring point few in number, therefore all there is linear discontinuous problem in above-mentioned technology except having different separately application limitations.
Adopt angular-rate sensor can carry out continuous measurement of angle, obtain continuous linear coordinate data by conversion continuous angle velocity amplitude, effectively overcome the defective of above each technology.That the method has is quick and convenient, simple to operate, continuity is good, and the real-time advantages of higher.Can carry out regular or non-regular various road surfaces, the linear fast detecting in tunnel in the situation that do not block traffic.
Angular-rate sensor generally adopts the higher fibre optic gyroscope of precision at present.Fibre optic gyroscope has highly reliable, the long-life, start soon, and the high advantage of the little precision of the light volume of quality is widely used at inertial navigation and engineering survey field.The basic parameter of optical fibre gyro determines its stability and accuracy, and these basic parameters comprise zero inclined to one side, zero partially stability, random walk coefficient, constant multiplier, scale factory non-linearity, asymmetry and repeatability.Yet because the stability of each parts of optical fibre gyro and drift of light source etc. factor, error inevitably appears in the output of optical fibre gyro.100 p optical fiber gyro output error comprises zero partial correlation error and scale factor error.Zero inclined to one side (repeatability) random drift, environmental sensitivity drift and output quantization noise cause the error of zero inclined to one side value, the accuracy of the non-linear repeatability of the asymmetry of constant multiplier and temperature control etc. influence scale factor.Along with time drift and temperature variation, gyro error will increase thereupon.
In the bridge linear measuring process, optical fibre gyro is pulled in bridge floor by carrier and advance in the road surface, obtains the increment of alignment curve coordinate by the integral operation to angular velocity and mileage gauge signal, and further integration is all measured sampled point with respect to the coordinate of starting point.Because the intrinsic error of integral and calculating forms mechanism, causes the error of coordinate Calculation value to increase along with the increase of Measuring Time.When therefore adopting this continuous coverage technology to measure, along with the carrying out of the process of measurement, error is the trend of dispersing gradually expansion.Therefore be necessary to adopt scaling method that measurement data is demarcated, reduce the systematic error in the linear measurement process.
Existing patent (application number: 201010574097.9 and 200910073154.2), for optical fibre gyro system itself a kind of attitude algorithm and filtering method in conjunction with gps data are proposed, above-mentioned two parts of patents are only carried out the algorithm of real time correction for the fiber-optic gyroscope strapdown inertial navigation system gps data of giving chapter and verse, and do not relate to the timely correction of trajectory measurement error.
Existing patent (application number: CN201210116750.6), the method of the linear and rigidity curve of employing optical fibre gyro linear measurement systematic survey bridge has been proposed, and mentioned the multiple method that reduces error, but this patent only adopts the analysis to data to reach the purpose that reduces error, does not have external demarcation bearing calibration.
Summary of the invention
The present invention relates to a kind of method to proofreading and correct based on the continuous linear measurement of angular-rate sensor.Continuous linear measuring system comprises range sensor and angular velocity measurement unit, and its Computing Principle is as follows:
X in the formula
m, Y
mBe respectively horizontal ordinate and ordinate, L is two distances between the sampled point, ω
iThe instantaneous angular velocity that records for the angular velocity measurement unit.t
iIt is the time interval between two sampled points.Because the calculating of this linear coordinate is based on the dual-integration computing, therefore the error of any intermediate data all can be added to net result.From formula as seen, range sensor, angular-rate sensor and time measured value all error might occur.Therefore need to take effective method that the result of calculation of alignment curve is calibrated.
The present invention proposes a kind of static shift correction method of continuous linear measuring system, and technical scheme of the present invention is:
Place the static demarcating bridge in tested highway section, utilize dimensional measuring instrument to record bridge high.Adopt continuous linear measuring system to detect containing the highway section of demarcating bridge, contain the alignment curve of demarcating bridge by linear calculating.The calculating bridge that can obtain demarcating bridge from alignment curve is high, and this is calculated the high contrast of the high and actual bridge that records of bridge, obtains the ordinate of orthogonal axes correction factor, utilizes the whole alignment curve of measuring of this coefficient correction.
The concrete grammar step:
1), adopt continuous linear system quantity to survey the linear of tested highway section;
2), the static demarcating bridge is positioned on the tested highway section, measure realistic bridges high;
3), carry out linear measurement to containing the tested highway section of demarcating bridge, contain the alignment curve of demarcating bridge by linear calculating, the calculating bridge that obtains demarcating bridge from alignment curve is high;
4), will utilizing calculating bridge that linear data obtain, high bridge is high compares with actual measurement, utilize the high correcting measuring bridge of actual measurement bridge high, and then the linear data in all tested highway sections proofreaied and correct.
In the static shift correction method of the present invention, described demarcation bridge is put in the optional position in tested highway section.
In the static shift correction method of the present invention, the high measured precision of the bridge of described demarcation bridge is 0.01 millimeter.
Description of drawings
Fig. 1 is the static shift correction method flow diagram of continuous linear measuring system of the present invention;
Fig. 2 measures the high schematic diagram of static demarcating bridge;
Fig. 3 is the linear schematic diagram in tested highway section without the static demarcating bridge that is of the present invention;
Fig. 4 is the linear schematic diagram in tested highway section that static demarcating bridge 1 is arranged of the present invention;
Among the figure: 1 is the static demarcating bridge, and 2 is linear without the tested highway section of static demarcating bridge, and 3 for there to be the tested highway section of static demarcating bridge 1 linear.
Embodiment
The static shift correction method flow of a kind of continuous linear measuring system of the present invention as shown in Figure 1, its canonical process is:
1. measure and demarcate the high h of bridge
m, measured precision is 0.01 millimeter, as shown in Figure 2;
2. measure that not contain the tested highway section of demarcating bridge linear, as shown in Figure 3;
3. measure the tested highway section that is placed with the demarcation bridge linear, as shown in Figure 4;
4. analyze relatively two kinds of measurement results, obtain calculating the high h of bridge through resolving alignment curve
c, calculate h
mAnd h
cRatio obtain ordinate of orthogonal axes correction factor λ, utilize the ordinate of this coefficient correction integral linear curve.
The calculation method of alignment curve is with reference to instructions formula (1).
Can predict, for a person skilled in the art, can be based on the multiple application example of the present invention's spirit exploitation, every modification that does not break away from the spirit or scope of the present invention all should belong to protection scope of the present invention.
Claims (4)
1. the static shift correction method of a continuous linear measuring system is characterized in that, the method is:
Place the static demarcating bridge in tested highway section, utilize dimensional measuring instrument to record bridge high; Adopt continuous linear measuring system to detect containing the highway section of demarcating bridge, contain the alignment curve of demarcating bridge by linear calculating; The calculating bridge that obtains demarcating bridge from alignment curve is high, and this is calculated the high contrast of the high and actual bridge that records of bridge, obtains the ordinate of orthogonal axes correction factor, utilizes the whole alignment curve of measuring of this coefficient correction.
2. the static shift correction method of a kind of continuous linear measuring system according to claim 1 is characterized in that, method step is:
1), adopt continuous linear system quantity to survey the linear of tested highway section;
2), the static demarcating bridge is positioned on the tested highway section, measure realistic bridges high;
3), carry out linear measurement to containing the tested highway section of demarcating bridge, contain the alignment curve of demarcating bridge by linear calculating, the calculating bridge that obtains demarcating bridge from alignment curve is high;
4), will utilizing calculating bridge that linear data obtain, high bridge is high compares with actual measurement, utilize the high correcting measuring bridge of actual measurement bridge high, and then the linear data in all tested highway sections proofreaied and correct.
3. the static shift correction method of a kind of continuous linear measuring system according to claim 1 and 2 is characterized in that, described demarcation bridge is put in the optional position in tested highway section.
4. the static shift correction method of a kind of continuous linear measuring system according to claim 1 and 2 is characterized in that, the high measured precision of the bridge of described demarcation bridge is 0.01 millimeter.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1997044737A1 (en) * | 1996-05-22 | 1997-11-27 | Geovector Corporation | Mehtod and apparatus for controlling electrical devices in response to sensed conditions |
| US7859678B2 (en) * | 2008-12-09 | 2010-12-28 | Northrop Grumman Guidance And Electronic Co., Inc. | Automatic gain control for fiber optic gyroscope deterministic control loops |
| CN102661716A (en) * | 2012-04-20 | 2012-09-12 | 武汉理工大学 | Method and system for detecting linearity and rigidity of bridges and tunnels on basis of fiber-optic gyroscope technology |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1997044737A1 (en) * | 1996-05-22 | 1997-11-27 | Geovector Corporation | Mehtod and apparatus for controlling electrical devices in response to sensed conditions |
| US7859678B2 (en) * | 2008-12-09 | 2010-12-28 | Northrop Grumman Guidance And Electronic Co., Inc. | Automatic gain control for fiber optic gyroscope deterministic control loops |
| CN102661716A (en) * | 2012-04-20 | 2012-09-12 | 武汉理工大学 | Method and system for detecting linearity and rigidity of bridges and tunnels on basis of fiber-optic gyroscope technology |
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