CN114157348B - Optical cable fault point positioning method - Google Patents

Abstract

The invention relates to the technical field of electric power communication, and discloses a method for locating a fault point of an optical cable. The length of the optical cable between the second reference point and the access end of the target optical cable, and the length of the optical cable between the fault point and the access end of the target optical cable are drawn on the map to include the target geographical range of the fault point. By narrowing the search range of the fault point to the target geographical range, the difficulty of searching for the fault point is greatly reduced, the time for searching for the fault point is reduced, and it is beneficial to quickly repair the optical cable.

Description

Optical cable fault location method

technical field

The invention relates to the technical field of electric power communication, in particular to a method for locating an optical cable fault point.

Background technique

Optical cables are widely used in power communication systems, and maintenance of communication optical cables is an important task in power system maintenance. Communication optical cables are often damaged due to construction, natural disasters and other reasons. After the communication optical cable is damaged, it needs to be repaired as soon as possible, otherwise it may affect the operation of the power system.

After the communication optical cable is damaged, an optical time domain reflectometer can be connected to the access end of the optical cable, and the length of the optical cable between the fault point and the access end of the optical cable can be detected by the optical time domain reflectometer. However, due to the bending and turning of the optical cable, it is difficult to determine the specific geographical location of each location of the optical cable. That is to say, it is difficult to accurately obtain the specific geographical location of the fault point only based on the length of the optical cable between the fault point and the access end of the optical cable. In some cases, the linear error between the location of the fault point and the actual position of the fault point It can even reach 2 kilometers. This greatly reduces the speed of repairing optical cables.

Contents of the invention

The purpose of the present invention is to overcome the deficiencies of the prior art and provide a method for locating fault points of optical cables.

Another object of the present invention is to provide one.

Embodiments of the invention are achieved through the following technical solutions:

Optical cable fault location method, including:

Step 1, select a plurality of reference points on the target optical cable, record the geographic coordinates of the reference points, and record the length of the optical cable between the reference point and the access end of the target optical cable;

Step 2, obtaining the length of the optical cable between the fault point of the target optical cable and the access end of the target optical cable through an optical time domain reflectometer;

Step 3: Select two reference points located on both sides of the fault point according to the length of the optical cable between the access end of the target optical cable, and call the two reference points located on both sides of the fault point the first reference point and the second reference point respectively. datum point;

Step 4, according to the geographic coordinates of the first reference point, the geographic coordinates of the second reference point, the length of the optical cable between the first reference point and the access end of the target optical cable, the second reference point and the access end of the target optical cable Draw the target geographical range including the fault point on the map;

Step 5, find fault points according to the target geographical range.

Further, step 4 specifically includes:

Step 4.1, according to the geographic coordinates of the first reference point, the geographic coordinates of the second reference point, the length of the optical cable between the first reference point and the access end of the target optical cable, and the second reference point and the access end of the target optical cable Draw the range covered by all possible extension trajectories of the optical cable between the first reference point and the second reference point on the map, and this range is the trajectory coverage;

Step 4.2, according to the geographical coordinates of the first reference point, the length of the optical cable between the first reference point and the access end of the target optical cable, and the length of the optical cable between the fault point and the access end of the target optical cable, draw the first point on the map - Coverage;

Step 4.3, according to the geographical coordinates of the second reference point, the length of the optical cable between the second reference point and the access end of the target optical cable, and the length of the optical cable between the fault point and the access end of the target optical cable, the second reference point is drawn on the map. 2. coverage;

In step 4.4, the overlap of the track coverage area, the first coverage area and the second coverage area is selected as the target geographical area.

Further, step 4.1 specifically includes:

Taking the geographic coordinates of the first reference point and the geographic coordinates of the second reference point as the focus, according to the length of the optical cable between the first reference point and the access end of the target optical cable and the second reference point and the access end of the target optical cable The cable length between draws an ellipse on the map, and the area enclosed by the ellipse is the track coverage area.

Further, in step 4.1, draw an ellipse in the following manner:

Establish an X0Y rectangular coordinate system on the map; the geographic coordinates of the first reference point and the second reference point are located on the X axis of the X0Y rectangular coordinate system and are symmetrical to the Y axis;

Draw an ellipse according to the equation (X ² ÷ A ² )+(Y ² ÷ B ² )=1;

Among them, X represents the coordinate value of any point on the ellipse on the X-axis in the X0Y rectangular coordinate system, Y represents the coordinate value of any point on the ellipse on the Y-axis in the X0Y rectangular coordinate system, L ₁ represents the first reference point and the target optical cable The length of the optical cable between the access ends of the target optical cable, L ₂ indicates the length of the optical cable between the second reference point and the access end of the target optical cable, and L ₀ indicates the straight-line distance between the first reference point and the second reference point.

Further, step 4.2 specifically includes:

Draw a circle on the map with the geographic coordinates of the first reference point as the center and _R1 as the radius, and the area enclosed by the circle is the first coverage area;

Among them, R ₁ =|L ₁ -L ₃ |, L ₁ represents the length of the optical cable between the first reference point and the access end of the target optical cable, L ₃ represents the distance between the fault point and the access end of the target optical cable Cable length.

Further, step 4.3 specifically includes:

Draw a circle on the map with the geographic coordinates of the second reference point as the center and _R2 as the radius, and the area enclosed by the circle is the second coverage area;

Among them, R ₂ =|L ₂ -L ₃ |, L ₂ represents the length of the optical cable between the second reference point and the access end of the target optical cable, L ₃ represents the distance between the fault point and the access end of the target optical cable Cable length.

Further, step 1 is performed when laying the optical cable.

Further, in step 1, reference points are selected at equal intervals on the target optical cable according to the length of the optical cable.

Further, the distance between the reference points is 300-600 meters.

The technical solution of the present invention has at least the following advantages and beneficial effects:

The method for locating the fault point of the optical cable provided by the embodiment of the present invention can narrow the search range of the fault point to the target geographical range, thereby greatly reducing the difficulty of searching for the fault point and the time for searching for the fault point, which is conducive to rapid repair of the optical cable.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present invention more clearly, the drawings that need to be used in the embodiments are briefly introduced below. It should be understood that the following drawings only illustrate some embodiments of the present invention, and should not be considered as limiting the scope of the present invention. Those skilled in the art can obtain other drawings based on these drawings without creative effort.

FIG. 1 is a schematic diagram of a method for locating an optical cable fault point provided by an embodiment of the present application;

FIG. 2 is a schematic diagram of drawing an ellipse in the method for locating an optical cable fault point provided by an embodiment of the present application.

In the figure: 011-first coverage; 012-second coverage; 013-trajectory coverage; 014-target geographical range; 100-target optical cable; 110-access terminal; 210-first reference point; 220- No. 2 reference point; 230-No. 3 reference point; 300-fault point; 400-optical time domain reflectometer.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are some, not all, embodiments of the present invention.

Therefore, the following detailed description of the embodiments of the present invention is not intended to limit the scope of the claimed invention, but merely represents some embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

It should be noted that, in the case of no conflict, the embodiments of the present invention and the features and technical solutions in the embodiments can be combined with each other.

It should be noted that like numerals and letters denote similar items in the following figures, therefore, once an item is defined in one figure, it does not require further definition and explanation in subsequent figures.

In the description of the present invention, it should be noted that the terms "first", "second" and so on are only used for distinguishing descriptions, and should not be understood as indicating or implying relative importance.

Example:

This embodiment provides a method for locating an optical cable fault point, and FIG. 1 is a schematic diagram of the method for locating an optical cable fault point provided by this embodiment. Referring to Fig. 1, the method for locating an optical cable fault point includes the following steps.

Step 1: Select multiple reference points on the target optical cable 100 , record the geographic coordinates of the reference points, and record the cable length between the reference points and the access end 110 of the target optical cable 100 .

In order to improve efficiency, this step is performed when laying optical cables. It can be understood that, in other implementation manners, step 1 may also be performed after the laying of the optical cable is completed.

For the convenience of description, in this embodiment, three reference points are selected on the target optical cable 100 , namely the first reference point 210 , the second reference point 220 and the third reference point 230 . Record the geographic coordinates of each datum point. The length of the optical cable between adjacent reference points is 500 meters, and the length of the optical cable between the first reference point 210 and the access terminal 110 is also 500 meters. It can be understood that in other implementation manners, the length of the optical cable between adjacent reference points may adopt other values. The smaller the length of the optical cable between adjacent reference points, the more accurate the location of the fault point 300 is. The greater the length of the optical cable between adjacent reference points, the lower the cost of performing step 1. In order to balance the execution cost of step 1 and the positioning accuracy of the fault point 300, the length of the optical cable between adjacent reference points can be set to 300-600 meters. In other implementation manners, the lengths of optical cables between adjacent reference points may also be different.

It should be noted that, for the convenience of illustration, the extension track of the target optical cable 100 is drawn in FIG. 1 . The method for locating the fault point of the optical cable provided in this embodiment does not know the specific extension track of the target optical cable 100 during actual implementation, but only knows the geographic coordinates of the access terminal 110 and each reference point.

Step 2: Obtain the optical cable length between the fault point 300 of the target optical cable 100 and the access end 110 of the target optical cable 100 through the optical time domain reflectometer 400 .

The optical time domain reflectometer 400 is connected to the access terminal 110 , and the optical cable length between the fault point 300 and the access terminal 110 of the target optical cable 100 can be obtained through the optical time domain reflectometer 400 . In this embodiment, the length of the optical cable between the fault point 300 and the access end 110 of the target optical cable 100 detected by the optical time domain reflectometer 400 is 720 meters.

It should be noted that, for the convenience of description, the specific location of the fault point 300 is marked in FIG. 1 . The method for locating an optical cable fault point provided by this embodiment does not know the specific location of the fault point 300 during actual implementation, but only the length of the optical cable between the fault point 300 and the access terminal 110 of the target optical cable 100 .

Step 3: Select two reference points located on both sides of the fault point 300 according to the cable length between the access terminal 110 of the target optical cable 100, and call the two reference points located on both sides of the fault point 300 respectively the first reference point point and the second reference point.

In this embodiment, the length of the optical cable between the first reference point 210 and the access terminal 110 is 500 meters, and the length of the optical cable between the second reference point 220 and the access terminal 110 is 1000 meters. Therefore, the first reference point 210 is called a first reference point, and the second reference point 220 is called a second reference point.

Step 4: According to the geographic coordinates of the first reference point (No. 1 reference point 210), the geographic coordinates of the second reference point (No. 2 reference point 220), the first reference point (No. 1 reference point 210) and the target optical cable 100 The length of the optical cable between the access terminals 110, the length of the optical cable between the second reference point (No. 2 reference point 220) and the access terminal 110 of the target optical cable 100, and the access terminal of the fault point 300 and the target optical cable 100 The length of fiber optic cable between 110 plots on the map the target geographic range 014 containing the point of failure 300 .

Specifically, step 4 also includes the following steps.

Step 4.1, according to the geographic coordinates of the first reference point (No. 1 reference point 210), the geographic coordinates of the second reference point (No. 2 reference point 220), the first reference point (No. 1 reference point 210) and the target optical cable 100 The cable length between the access terminals 110 and the cable length between the second reference point (No. 2 reference point 220) and the access terminal 110 of the target optical cable 100 draw the first reference point (No. 1 reference point) on the map 210) and the second reference point (No. 2 reference point 220), the range covered by all possible extension trajectories of the optical cable is the trajectory coverage range 013.

Specifically, with the geographic coordinates of the first reference point (No. 1 reference point 210) and the geographic coordinates of the second reference point (No. 2 reference point 220) as the focus, according to the first reference point (No. 1 reference point 210) and the target The cable length between the access end 110 of the optical cable 100 and the cable length between the second reference point (No. 2 reference point 220) and the access end 110 of the target optical cable 100 draw an ellipse on the map, and the ellipse encloses The scope is Track Coverage 013.

FIG. 2 is a schematic diagram of drawing an ellipse in the method for locating an optical cable fault point provided in this embodiment. Please refer to Figure 2 to draw an ellipse as follows:

Set up the X0Y rectangular coordinate system on the map; The geographic coordinates of the first reference point (No. 1 reference point 210) and the geographic coordinates of the second reference point (No. 2 reference point 220) are all located on the X axis of the X0Y rectangular coordinate system, and Symmetrical with respect to the Y axis;

Draw an ellipse according to the equation (X ² ÷ A ² )+(Y ² ÷ B ² )=1;

Among them, X represents the coordinate value of any point on the ellipse on the X-axis in the X0Y rectangular coordinate system, Y represents the coordinate value of any point on the ellipse on the Y-axis in the X0Y rectangular coordinate system, and _L1 represents the first reference point (No. The length of the cable between the reference point 210) and the access terminal 110 of the target optical cable 100, _L represents the cable length between the second reference point (No. 2 reference point 220) and the access terminal 110 of the target cable 100, L ₀ represents the linear distance between the first reference point (No. 1 reference point 210 ) and the second reference point (No. 2 reference point 220 ). In this embodiment, the linear distance between the first reference point (No. 1 reference point 210 ) and the second reference point (No. 2 reference point 220 ) is 400 meters.

In this embodiment, L ₁ =500, L ₂ =1000, and L ₀ =400. Calculated to get:

That is, an ellipse is drawn according to the equation (X ² ÷ 250 ² )+(Y ² ÷150 ² )=1.

Step 4.2: According to the geographic coordinates of the first reference point (No. 1 reference point 210), the length of the optical cable between the first reference point (No. 1 reference point 210) and the access terminal 110 of the target optical cable 100, and the fault point 300 and The length of the cable between the entry ends 110 of the target cable 100 plots a first coverage area 011 on the map.

Specifically, draw a circle with the geographic coordinates of the first reference point (No. 1 reference point 210) on the map as the center and _R1 as the radius, and the range enclosed by the circle is the first coverage area 011;

Wherein, R ₁ =|L ₁ -L ₃ |, L ₁ represents the length of the optical cable between the first reference point (No. 1 reference point 210) and the access end 110 of the target optical cable 100, and L ₃ represents the distance between the fault point 300 and The length of the fiber optic cable between the entry ends 110 of the target fiber optic cable 100 .

In this embodiment, L ₁ =500, L ₃ =720. R ₁ =220 is calculated.

Step 4.3, according to the geographic coordinates of the second reference point (No. 2 reference point 220), the length of the optical cable between the second reference point (No. 2 reference point 220) and the access terminal 110 of the target optical cable 100, and the fault point 300 and The length of the cable between the entry ends 110 of the target cable 100 plots a second coverage area 012 on the map.

Specifically, on the map, take the geographic coordinates _of the second reference point (No. 2 reference point 220) as the center of the circle, and draw a circle with R as the radius, and the range enclosed by the circle is the second coverage area 012;

Wherein, R ₂ =|L ₂ -L ₃ |, L ₂ represents the length of the optical cable between the second reference point (No. 2 reference point 220) and the access end 110 of the target optical cable 100, and L ₃ represents the distance between the fault point 300 and The length of the fiber optic cable between the entry ends 110 of the target fiber optic cable 100 .

In this embodiment, L ₂ =1000, L ₃ =720. R ₂ =280 was calculated.

In step 4.4, the overlap of the trajectory coverage area 013, the first coverage area 011 and the second coverage area 012 is selected as the target geographic area 014.

Step 5: Find the fault point 300 according to the target geographical range 014 .

By the optical cable fault location method provided in this embodiment, the search range of the fault point 300 can be narrowed to the target geographic range 014, thereby greatly reducing the difficulty of searching for the fault point 300 and reducing the time for searching for the fault point 300, which is beneficial Quickly repair fiber optic cables.

The above descriptions are only some embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (7)

1. The method for positioning the fault point of the optical cable is characterized by comprising the following steps:

step 1, selecting a plurality of reference points on a target optical cable, recording geographic coordinates of the reference points, and recording the length of the optical cable between the reference points and an access end of the target optical cable;

step 2, obtaining the optical cable length between the fault point of the target optical cable and the access end of the target optical cable through an optical time domain reflectometer;

step 3, selecting two reference points positioned at two sides of the fault point according to the length of the optical cable between the optical cable and the access end of the target optical cable, and respectively calling the two reference points positioned at two sides of the fault point as a first reference point and a second reference point;

step 4, drawing a target geographical range containing the fault point on a map according to the geographical coordinates of the first reference point, the geographical coordinates of the second reference point, the optical cable length between the first reference point and the access end of the target optical cable, the optical cable length between the second reference point and the access end of the target optical cable and the optical cable length between the fault point and the access end of the target optical cable;

step 5, searching the fault point according to the target geographic range;

the step 4 specifically includes:

step 4.1, drawing a range covered by all possible extending tracks of the optical cable between the first reference point and the second reference point on a map according to the geographic coordinate of the first reference point, the geographic coordinate of the second reference point, the optical cable length between the first reference point and the access end of the target optical cable and the optical cable length between the second reference point and the access end of the target optical cable, wherein the range is a track coverage range;

step 4.2, drawing a first coverage range on a map according to the geographic coordinate of the first reference point, the optical cable length between the first reference point and the access end of the target optical cable and the optical cable length between the fault point and the access end of the target optical cable;

step 4.3, drawing a second coverage area on a map according to the geographic coordinates of the second reference point, the optical cable length between the second reference point and the access end of the target optical cable and the optical cable length between the fault point and the access end of the target optical cable;

step 4.4, selecting the coincidence position of the track coverage range, the first coverage range and the second coverage range as the target geographic range;

the step 4.1 specifically comprises:

and drawing an ellipse on a map according to the optical cable length between the first datum point and the access end of the target optical cable and the optical cable length between the second datum point and the access end of the target optical cable by taking the geographic coordinate of the first datum point and the geographic coordinate of the second datum point as focuses, wherein the range surrounded by the ellipse is the track coverage range.

2. The method for locating a fault point of an optical cable according to claim 1, wherein in the step 4.1, an ellipse is drawn by:

establishing an X0Y rectangular coordinate system on a map; the geographic coordinates of the first reference point and the geographic coordinates of the second reference point are both positioned on the X axis of the X0Y rectangular coordinate system and are symmetrical relative to the Y axis;

according to equation (X) ² ÷A ² )+(Y ² ÷B ² ) =1 drawing an ellipse;

wherein X represents the coordinate value of any point on the ellipse on the X axis in the X0Y rectangular coordinate system, Y represents the coordinate value of any point on the ellipse on the Y axis in the X0Y rectangular coordinate system, L ₁ Representing a cable length, L, between the first reference point and the access tip of the target cable ₂ Representing a cable length, L, between the second reference point and the access tip of the target cable ₀ Represents a straight-line distance between the first reference point and the second reference point.

3. The optical cable fault point positioning method according to claim 1, wherein the step 4.2 specifically includes:

taking the geographic coordinates of the first reference point as the center of a circle and taking R as the center of a circle on a map ₁ Drawing a circle for the radius, wherein the range enclosed by the circle is the first coverage range;

wherein R is ₁ ＝|L ₁ -L ₃ |，L ₁ Representing a cable length, L, between the first reference point and the access tip of the target cable ₃ Representing a cable length between the fault point and the access tip of the target cable.

4. The optical cable fault point positioning method according to claim 1, wherein the step 4.3 specifically includes:

taking the geographic coordinate of the second reference point as the center of a circle and taking R as the center of a circle on the map ₂ Draw a circle for the radius of theThe range surrounded by the circles is the second coverage range;

wherein R is ₂ ＝|L ₂ -L ₃ |，L ₂ Representing a cable length, L, between the second reference point and the access tip of the target cable ₃ Representing a cable length between the fault point and the access tip of the target cable.

5. The optical cable fault point positioning method as claimed in claim 1, wherein:

the step 1 is performed when the optical cable is laid.

6. The optical cable fault point positioning method as claimed in claim 1, wherein:

in the step 1, the reference points are selected at equal intervals on the target optical cable according to the length of the optical cable.

7. The optical cable fault point positioning method as claimed in claim 6, wherein: the distance between the reference points is 300-600 meters.

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