Atmospheric waveguide interference source positioning method and system

Abstract

The invention relates to the technical field of electronics and communication, and particularly provides a method and a system for positioning an atmospheric waveguide interference source, comprising the following steps: (1) judging an interference direction; the method comprises the following steps of: firstly, through network management interference monitoring, judging a regional cell interfered by the atmospheric waveguide through a cell interference bottom noise slope waveform, and then determining a station influenced by the same atmospheric waveguide interference according to an interference time period; (2) calculating an interference distance; and according to the incident angle and the refractive index of the waveguide layer and the attenuation or subtraction of the signal, the linear distance of the waveguide is calculated by using a trigonometric function, so that the interference source is judged, and the distance from the interference source to the interference base station is the interference distance. Compared with the prior art, the direction and distance of the interference source can be determined by using the characteristics of atmospheric waveguide interference and the transmission characteristics of radio waves, so that the specific location of the atmospheric waveguide interference source is judged.

Description

Technical Field

[0001] The present invention relates to the field of electronics and communication technology, and specifically provides a method and system for locating an atmospheric duct interference source. Background Art

[0002] Under certain meteorological conditions, electromagnetic waves propagating in the atmospheric boundary layer, especially in the near-ground layer, are affected by atmospheric refraction, and their propagation trajectory bends toward the ground. When the curvature exceeds the curvature of the earth's surface, the electromagnetic waves will be partially trapped in a thin layer of atmosphere of a certain thickness, just like electromagnetic waves propagating in a metal waveguide. This phenomenon is called atmospheric duct propagation of electromagnetic waves. The atmospheric duct phenomenon makes it possible for radar to observe targets at several times the normal detection distance. Similarly, for the TD-LTE system of the communication system, it will cause long-distance co-frequency interference. Atmospheric ducts are generally divided into three categories: surface ducts, lift ducts, and evaporation ducts. Evaporation ducts generally occur in marine atmospheric environments, while surface ducts and lift ducts exist in both land and marine environments.

[0003] (1) Surface waveguides generally appear in clear and sunny weather with a relatively stable atmosphere. At this time, the lower atmosphere often has a relatively stable inversion layer, and the humidity generally decreases with altitude.

[0004] (2) A lift waveguide is an atmospheric waveguide with a suspended lower boundary. It usually occurs in the lower troposphere below 3000m. It is usually composed of a suspended trapped layer superimposed on a suspended base layer. The lower boundary of the lift waveguide is usually tens or hundreds of meters above the ground, and a layer of inversion stratification usually appears above this height.

[0005] (3) Evaporation duct is a special surface duct that often appears in the marine atmosphere. It is formed by the evaporation of water vapor from the sea surface, which causes the atmospheric humidity in a small altitude range above the sea surface to decrease sharply with altitude. Evaporation duct generally occurs in the near-sea atmosphere below 40m in the marine atmosphere, and it consists of a thin trapping layer.

[0006] Currently, atmospheric waveguides can only be judged by waveforms, and the specific location of the interference source cannot be accurately located, which brings certain difficulties to the remediation of atmospheric waveguides. Summary of the invention

[0007] The present invention aims at solving the above-mentioned deficiencies of the prior art and provides a method for locating an atmospheric waveguide interference source with strong practicability.

[0008] A further technical task of the present invention is to provide a positioning system for atmospheric waveguide interference sources that is rationally designed, safe and applicable.

[0009] The technical solution adopted by the present invention to solve its technical problem is:

[0010] A method for locating an atmospheric duct interference source comprises the following steps:

[0011] (1) Determination of interference direction;

[0012] First, through network management interference monitoring, the regional cells affected by atmospheric waveguide interference are determined by the cell interference floor slope waveform, and then the sites affected by the same atmospheric waveguide interference are determined according to the interference period;

[0013] (2) Calculation of interference distance;

[0014] According to the incident angle, refractive index and signal attenuation of the waveguide layer, the straight-line distance of the waveguide is calculated using trigonometric functions to determine the interference source. The distance from the interference source to the interfering base station is the interference distance.

[0015] Furthermore, in step (1) interference direction determination, after the interference area cell is determined, the interference noise floor of each base station and cell is analyzed, and the azimuth angle of the cell with the higher interference noise floor of the three cells of the same base station is used as the initial azimuth of the interference source;

[0016] Similarly, the locations of all cells in the same area that are most affected by interference are analyzed and obtained. Then, the locations of all cells with strong interference are used to accurately locate the interference source. The directions of the interference sources pointed by multiple base stations are focused on and the direction of the interference can be obtained through the KNN algorithm.

[0017] Furthermore, in the interference distance calculation of step (2), the atmospheric duct interference has the characteristic of changing with time and tends to occur during the period from early morning to early morning;

[0018] According to the following formula, the modified refractive index M will have a negative gradient in the range, leading to the generation of an atmospheric ducting layer;

[0019]

[0020] N is the dimensionless refractive index, T is the absolute temperature in K, p is the air pressure in hPa, and e is the water vapor pressure in hPa.

[0021] Furthermore, considering the influence of the earth's curvature, the corrected refractive index M is:

[0022]

[0023] z is the height from the ground surface and is the radius of the earth. Under normal circumstances, M increases with increasing altitude. When M has a negative gradient, an atmospheric waveguide will be generated at the corresponding altitude, and the electromagnetic signal will be captured in this altitude.

[0024] Furthermore, the ground distance of the target in the lower atmosphere along the horizontal direction is defined as follows:

[0025]

[0026] According to the incident angle, refractive index and signal attenuation of the waveguide layer, the straight-line distance of the waveguide is calculated using trigonometric functions to determine the interference source. The distance from the interference source to the interfering base station is the interference distance.

[0027] A positioning system for atmospheric waveguide interference sources first determines the interference direction, monitors the interference through network management, and determines the regional cells affected by atmospheric waveguide interference through the cell interference bottom noise slope waveform, and then determines the sites affected by the same atmospheric waveguide interference according to the interference period;

[0028] Finally, according to the incident angle, refractive index and signal attenuation of the waveguide layer, the straight-line distance of the waveguide is calculated using trigonometric functions to determine the interference source. The distance from the interference source to the interfering base station is the interference distance.

[0029] Furthermore, in the interference direction judgment, after the interference area cell is determined, by analyzing the interference noise floor of each base station and cell, the azimuth of the cell with higher interference noise floor of the three cells of the same base station is used as the initial azimuth of the interference source;

[0030] Similarly, the locations of all cells in the same area that are most affected by interference are analyzed and obtained. Then, the locations of all cells with strong interference are used to accurately locate the interference source. The directions of the interference sources pointed by multiple base stations are focused on and the direction of the interference can be obtained through the KNN algorithm.

[0031] Furthermore, in the interference distance calculation, atmospheric duct interference has the characteristic of changing with time and tends to occur during the early morning to early morning period;

[0032] According to the following formula, the modified refractive index M will have a negative gradient in the range, leading to the generation of an atmospheric ducting layer;

[0033]

[0034] N is the dimensionless refractive index, T is the absolute temperature in K, p is the air pressure in hPa, and e is the water vapor pressure in hPa.

[0035] Furthermore, considering the influence of the earth's curvature, the corrected refractive index M is:

[0036]

[0037] z is the height from the ground surface and is the radius of the earth. Under normal circumstances, M increases with increasing altitude. When M has a negative gradient, an atmospheric waveguide will be generated at the corresponding altitude, and the electromagnetic signal will be captured in this altitude.

[0038] Furthermore, the ground distance of the target in the lower atmosphere along the horizontal direction is defined as follows:

[0039]

[0040] According to the incident angle, refractive index and signal attenuation of the waveguide layer, the straight-line distance of the waveguide is calculated using trigonometric functions to determine the interference source. The distance from the interference source to the interfering base station is the interference distance.

[0041] Compared with the prior art, the method and system for locating an atmospheric duct interference source of the present invention have the following outstanding beneficial effects:

[0042] The present invention can utilize the characteristics of atmospheric waveguide interference and the characteristics of radio wave transmission to determine the direction and distance of the interference source, thereby determining the specific location of the atmospheric waveguide interference source. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0044] Attached Figure 1 It is a schematic diagram of a method for locating atmospheric duct interference sources. DETAILED DESCRIPTION

[0045] In order to enable those skilled in the art to better understand the solution of the present invention, the present invention is further described in detail below in conjunction with specific implementation methods. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0046] A best embodiment is given below:

[0047] like Figure 1 As shown, a method for locating an atmospheric duct interference source in this embodiment has the following steps:

[0048] (1) Determination of interference direction;

[0049] First, through network management interference monitoring, the regional cells affected by atmospheric waveguide interference are determined by the cell interference floor slope waveform, and then the sites affected by the same atmospheric waveguide interference are determined according to the interference period;

[0050] Secondly, after determining the cells in the interference area, by analyzing the interference noise floor of each base station and cell, the azimuth of the cell with the highest interference noise floor of the three cells of the same base station is used as the initial azimuth of the interference source. Similarly, the azimuth of all cells in this area that are strongly affected by interference with the same base station is analyzed. Then the azimuth of all cells with strong interference is used to accurately locate the azimuth of the interference source. Focusing on the direction of the interference source pointed by multiple base stations, the direction of the interference can be obtained through the KNN algorithm.

[0051] The azimuths of the cells with the strongest base station interference in the table below are as follows:

[0052]

[0053]

[0054] (2) Calculation of interference distance;

[0055] During the period from midnight to early morning, the ground temperature drops rapidly, and the lower atmosphere on the surface is prone to produce an inversion layer, that is, the atmospheric temperature rises with increasing altitude.

[0056] According to the following formula:

[0057]

[0058] Here N is the dimensionless refractive index, T is the absolute temperature in K, p is the air pressure in hPa, and e is the water vapor pressure in hPa.

[0059] The modified refractive index M will have a negative gradient in this range, leading to the generation of an atmospheric ducting layer.

[0060] In addition Figure 1 The interference intensity in the central and northern parts of Liaocheng will be greater than that in the southern part. Considering the actual geographical situation of Liaocheng City, there are more rural areas in the west, and the terrain is open and flat, which is conducive to the expansion of the waveguide layer; while in the city, there are more high-rise buildings, and the interference signal is easily blocked, so the interference level will be reduced. From this we can conclude that atmospheric waveguide interference has the characteristics of changing with time, and it is easy to occur from early morning to early morning; rural areas are usually more likely to be affected by atmospheric waveguide interference.

[0061] Taking into account the influence of the earth's curvature, the corrected refractive coefficient M is:

[0062]

[0063] z is the height from the surface of the earth and is the radius of the earth. Under normal circumstances, M increases with increasing altitude. When M has a negative gradient, an atmospheric waveguide will be generated at the corresponding altitude, and the electromagnetic signal will be captured in this altitude.

[0064] Through the function, the ground distance of the target in the lower atmosphere along the horizontal direction is defined as follows:

[0065]

[0066] According to the waveguide layer height of 48 meters, when the waveguide layer is 40 meters, the incident angle is 15 degrees, the refractive index is 1.1, when the waveguide layer height is 50 meters, the incident angle is 10 degrees, the refractive index is 1.05, etc.), the incident angle (10-15 degrees), and the signal attenuation, the trigonometric function is used to calculate the straight-line distance of the waveguide, thereby determining the interference source.

[0067] By calculation, the distance between the interference source and the interfering base station is 114km.

[0068] Based on the above method, a positioning system for an atmospheric waveguide interference source in this embodiment first determines the interference direction, monitors the interference through network management, and determines the regional cells affected by the atmospheric waveguide interference through the cell interference bottom noise slope waveform, and then determines the sites affected by the same atmospheric waveguide interference according to the interference period;

[0069] Finally, according to the incident angle, refractive index and signal attenuation of the waveguide layer, the straight-line distance of the waveguide is calculated using trigonometric functions to determine the interference source. The distance from the interference source to the interfering base station is the interference distance.

[0070] Among them, in the interference direction judgment, after the interference area cell is determined, by analyzing the interference noise floor of each base station and cell, the azimuth of the cell with higher interference noise floor of the three cells of the same base station is used as the initial azimuth of the interference source;

[0071] Similarly, the locations of all cells in the same area that are most affected by interference are analyzed and obtained. Then, the locations of all cells with strong interference are used to accurately locate the interference source. The directions of the interference sources pointed by multiple base stations are focused on and the direction of the interference can be obtained through the KNN algorithm.

[0072] In interference distance calculation, atmospheric waveguide interference has the characteristics of changing with time and tends to occur during the early morning to early morning period;

[0073] According to the following formula, the modified refractive index M will have a negative gradient in the range, leading to the generation of an atmospheric ducting layer;

[0074]

[0075] N is the dimensionless refractive index, T is the absolute temperature in K, p is the air pressure in hPa, and e is the water vapor pressure in hPa.

[0076] Taking into account the influence of the earth's curvature, the corrected refractive coefficient M is:

[0077]

[0078] z is the height from the ground surface and is the radius of the earth. Under normal circumstances, M increases with increasing altitude. When M has a negative gradient, an atmospheric waveguide will be generated at the corresponding altitude, and the electromagnetic signal will be captured in this altitude.

[0079] The ground distance of the target in the lower atmosphere along the horizontal direction is defined as follows:

[0080]

[0081] According to the incident angle, refractive index and signal attenuation of the waveguide layer, the straight-line distance of the waveguide is calculated using trigonometric functions to determine the interference source. The distance from the interference source to the interfering base station is the interference distance.

[0082] The above-mentioned specific implementations are only specific cases of the present invention. The patent protection scope of the present invention includes but is not limited to the above-mentioned specific implementations. Any technical solutions that comply with the claims of the present invention and any appropriate changes or substitutions made by ordinary technicians in the relevant technical field shall fall within the patent protection scope of the present invention.

[0083] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for locating atmospheric duct interference sources, It is characterized in that The steps are as follows: (1) Determination of interference direction; First, through network management interference monitoring, the regional cells affected by atmospheric waveguide interference are determined by the cell interference floor slope waveform, and then the sites affected by the same atmospheric waveguide interference are determined according to the interference period; (2) Calculation of interference distance; According to the incident angle, refractive index and signal attenuation of the waveguide layer, the straight-line distance of the waveguide is calculated using trigonometric functions to determine the interference source. The distance from the interference source to the interfering base station is the interference distance.

2. A method for locating an atmospheric duct interference source according to claim 1, It is characterized in that In step (1) interference direction determination, after the interference area cell is determined, the interference noise floor of each base station and cell is analyzed, and the azimuth of the cell with the highest interference noise floor of the three cells of the same base station is taken as the initial azimuth of the interference source; Similarly, the locations of all cells in the same area that are most affected by interference are analyzed and obtained. Then, the locations of all cells with strong interference are used to accurately locate the interference source. The directions of the interference sources pointed by multiple base stations are focused on and the direction of the interference can be obtained through the KNN algorithm.

3. A method for locating an atmospheric duct interference source according to claim 2, It is characterized in that In step (2) of interference distance calculation, atmospheric duct interference has the characteristic of changing with time and tends to occur during the early morning to morning period; According to the following formula, the modified refractive index M will have a negative gradient in the range, leading to the generation of an atmospheric ducting layer; N is the dimensionless refractive index, T is the absolute temperature in K, p is the air pressure in hPa, and e is the water vapor pressure in hPa.

4. A method for locating an atmospheric duct interference source according to claim 3, It is characterized in that Taking into account the influence of the earth's curvature, the corrected refractive coefficient M is: z is the height from the ground surface and is the radius of the earth. Under normal circumstances, M increases with increasing altitude. When M has a negative gradient, an atmospheric waveguide will be generated at the corresponding altitude, and the electromagnetic signal will be captured in this altitude.

5. A method for locating an atmospheric duct interference source according to claim 3, It is characterized in that The ground distance of the target in the lower atmosphere along the horizontal direction is defined as follows: According to the incident angle, refractive index and signal attenuation of the waveguide layer, the straight-line distance of the waveguide is calculated using trigonometric functions to determine the interference source. The distance from the interference source to the interfering base station is the interference distance.

6. A system for locating atmospheric duct interference sources, It is characterized in that First, the interference direction is determined by monitoring the interference of the network management system and judging the regional cells affected by the atmospheric waveguide interference through the slope waveform of the cell interference floor. Then, the sites affected by the same atmospheric waveguide interference are determined according to the interference period. Finally, according to the incident angle, refractive index and signal attenuation of the waveguide layer, the straight-line distance of the waveguide is calculated using trigonometric functions to determine the interference source. The distance from the interference source to the interfering base station is the interference distance.

7. A system for locating atmospheric duct interference sources according to claim 6, It is characterized in that In the interference direction judgment, after the interference area cell is determined, the interference noise floor of each base station and cell is analyzed, and the azimuth of the cell with higher interference noise floor of the three cells of the same base station is used as the initial azimuth of the interference source; Similarly, the locations of all cells in the same area that are most affected by interference are analyzed and obtained. Then, the locations of all cells with strong interference are used to accurately locate the interference source. The directions of the interference sources pointed by multiple base stations are focused on and the direction of the interference can be obtained through the KNN algorithm.

8. A system for locating atmospheric duct interference sources according to claim 7, It is characterized in that In interference distance calculation, atmospheric waveguide interference has the characteristics of changing with time and tends to occur during the early morning to early morning period; According to the following formula, the modified refractive index M will have a negative gradient in the range, leading to the generation of an atmospheric ducting layer; N is the dimensionless refractive index, T is the absolute temperature in K, p is the air pressure in hPa, and e is the water vapor pressure in hPa.

9. A system for locating atmospheric duct interference sources according to claim 8, It is characterized in that Taking into account the influence of the earth's curvature, the corrected refractive coefficient M is: z is the height from the ground surface and is the radius of the earth. Under normal circumstances, M increases with increasing altitude. When M has a negative gradient, an atmospheric waveguide will be generated at the corresponding altitude, and the electromagnetic signal will be captured in this altitude.

10. A system for locating atmospheric duct interference sources according to claim 9, It is characterized in that The ground distance of the target in the lower atmosphere along the horizontal direction is defined as follows: According to the incident angle, refractive index and signal attenuation of the waveguide layer, the straight-line distance of the waveguide is calculated using trigonometric functions to determine the interference source. The distance from the interference source to the interfering base station is the interference distance.

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