CN101277508B - Method for seeking GSM-R interference source - Google Patents
Method for seeking GSM-R interference source Download PDFInfo
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- CN101277508B CN101277508B CN200810106456A CN200810106456A CN101277508B CN 101277508 B CN101277508 B CN 101277508B CN 200810106456 A CN200810106456 A CN 200810106456A CN 200810106456 A CN200810106456 A CN 200810106456A CN 101277508 B CN101277508 B CN 101277508B
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Abstract
The present invention provides a searching method of GSM-R interference source, belonging to the technical field of digital mobile communication special for tdma, since the interference source of GSM-R mainly includes frequencies of uplink 885-889MHz and downlink 930-934MHz used for China mobile, aiming at the characteristics, an Okumura-hata model structure mathematical model widely used for radio wave propagation is used to process search of the interference source. The invention has advantages of simple operation, convenient operation, quick location to the interference source, overcoming the fault of slow search speed of present interference source search; fit for multiple topographic conditions, searching the interference sources of six topographic conditions such as urban districts of small and medium-sized cities, outskirts of small and medium-sized cities, opening environment of small and medium-sized cities, urban districts of big cities, outskirts of big cities and opening environment of big cities.
Description
Technical field
The present invention relates to a kind of GSM-R (Railway Special GSM) interference source lookup method; More particularly; Relate to a kind of based on Okumura-hata (radio waves propagation model of village difficult to understand-Ha Ta) be used for GSM-R communication system interference source lookup method, belong to time division multiple access special digital mobile communication technology field.
Background technology
GSM can be divided into frequency division multiple access, time division multiple access and CDMA mobile telecommunication by multi-access mode; Come branch can be divided into specialized mobile radio and public mobile communication by service range; Can be divided into analog-and digital-mobile communication by signal form.
The Railway Special mobile communication is in the high speed development stage.China has built up Qinghai-Tibet Railway, three GSM-R circuits of Qun Dynasty's line and Jiao Ji Railway Line of representing plateau, heavy duty and busy trunk lines respectively now, the implementation phase that the construction of Line for Passenger Transportation also having got into.Though GSM-R has characteristics such as perfect in shape and function, transmission is reliable, exchange is flexible, capacity is big; Obtained good development in global various countries; And in the railway development of various countries, playing the part of more and more important role; Guiding global railway cause to develop towards the direction of digitlization, intellectuality, networking and synthesization, but also having many problem demanding prompt solutions in China, wherein the interference assessment before the networking is exactly a problem that wherein need solve.Because the frequency range that China GSM-R uses is: 885-889MHz (up), 930-934MHz (descending) be the 4M bandwidth altogether; This frequency range and public mobile communication system of China Mobile are shared by the region; Its common range is: the city in municipality directly under the Central Government, provincial capital and cities specifically designated in the state plan, and the coverage of GSM-R system coordination should be less than each 2km of railway both sides; Coverage in that coordinate other regions should be less than each 6km of railroad track both sides.Therefore the GSM-R system is more complicated than the interference of public mobile communication system, except system's self-characteristic, also may receive the interference of gsm system and cdma system base station.The interference of GSM is to influence one of key factor of the quality of wireless network and transmission reliability; In order to guarantee that mobile radio communication can turn round effectively; All users can be communicated by letter without interfering with each other; The assessment that must disturb and coordination, this is one of most important task in the wireless communication network design, also is that network is just built, reconstruction, dilatation, optimizes one of problem that each stage need pay close attention to.In the GSM-R system, interference will cause that error code increases, speech quality descends, data transmission error increases.During serious interference, wireless channel is blocked owing to interference level reaches threshold value, cause the waste of frequency spectrum resource.The GSM-R GSM is as the Railway Special GSM, and different with the public mobile communication system is, and it requires system to have the safe operation that higher reliability and QoS ensure train.Therefore, in the construction of GSM-R mobile communications network, should be specifically noted that the solution interference problem, so that the GSM-R network plays a role better.Interference Position Research for public mobile communication net GSM mainly concentrates on following several class methods:
1 utilizes test data to carry out interference source identification; If outer interference of net utilizes spectrum analysis to position, if interference judges whether to be co-channel interference if then utilize the BSIC (base station identity code) of decoding to carry out corresponding ELIMINATION OF ITS INTERFERENCE measure in conjunction with the network layout data again in the net;
2 utilize network management system data, cellular cell layout data and drive test data to search interference source, and modify is carried out in the former network planning, eliminate and disturb;
3 find that through test interference signal is arranged, and the mode that when interference signal is positioned, adopts directional antenna progressively to approach is searched;
Analyze for above several kinds of interference positioning methods; Our discover method 1 needs the BSIC data of network or receives the signal spectrum data; For the study subject of this paper mainly be interference assessment and location before the networking so there is not relevant BSIC information, the method is inapplicable; Though need the relevant layout data of network equally and the clear frequency of GSM-R before networking is primarily aimed at the shared band interference of China Mobile GSM for method 2; But can't take the network planning data of China Mobile; Have only through test and search, so this method is also inapplicable for us.Method 3 is progressively located interference signal through utilizing directional antenna test, and this method efficient that wastes time and energy is low, does not make full use of the propagation characteristic of electric wave.
Summary of the invention:
The objective of the invention is to overcome the shortcoming and defect of prior art, utilize the data of dynamic test in early stage, (village difficult to understand-Ha Ta) radio waves propagation model is searched interference source fast through utilizing the Okumura-hata that uses always to set up a Mathematical Modeling of searching interference source.A kind of lookup method of suitable GSM-R interference source characteristics is provided.
The objective of the invention is to realize through following technical scheme:
A kind of GSM-R interference source lookup method comprises the steps:
Set up the Mathematical Modeling that an interference source is searched;
Mathematical Modeling is: very high if test obtains the interference level in a certain highway section under the situation of single interference source; Get the wherein electric field strength of two points (unit is dBm); Be made as X, Y 2 points; Distance between two points is A, then according to corresponding landform radio waves propagation model, and supposes that base station height and transmitting power are exemplary height and the typical transmit power that China Mobile uses in corresponding landform.Can calculate corresponding launch point is two circles, if be single interference source situation then two circles have two intersection points to be made as A point and B point.And can calculate the coordinate of two intersection points.Just can confirm two possible places of interference source according to the corresponding digital map.Change to confirm it is which point in the test of the above and below of two intersection points based on corresponding level again.See that Fig. 1 and deduce mathematical are following:
(1) confirm 2 A points and B point, the distance that requires point-to-point transmission is greater than a km; To be fit to the Okumura-hata (scope of application of radio waves propagation model of village difficult to understand-Ha Ta);
(2) relevant parameter of the Chosen Point input MATLAB program that programming obtains according to Mathematical Modeling is drawn the horizontal ordinate of noise spot.
Program principle and operating procedure are following:
Step 1: the step that urban district, small and medium-sized cities interference source is searched MATLAB is:
1, based on early stage test data find out two some X points and Y point, require distance between two points greater than 1 km;
2, input X point and Y point incoming level, the height of the frequency test antenna of the interference source that base station transmitting power will be investigated and the height of base station testing antenna;
3, bring data into village difficult to understand and breathe out in urban district, the small and medium-sized cities model formation of tower model, can obtain that interference source ground that X point and Y order requests a song is a circle;
4, if two circles have intersection point output intersecting point coordinate, if two no intersection points of circle, this method is inapplicable.
Step 2: the step that suburb, small and medium-sized cities interference source is searched MATLAB is:
1, based on early stage test data find out two some X points and Y point, require distance between two points greater than 1 km;
2, input X point and Y point incoming level, the height of the frequency test antenna of the interference source that base station transmitting power will be investigated and the height of base station testing antenna;
3, bring data into village difficult to understand and breathe out in suburb, the small and medium-sized cities model formation of tower model, can obtain the interference source place that X point and Y order respectively is a circle;
4, if two circles have intersection point output intersecting point coordinate, if two no intersection points of circle, this method is inapplicable.
Step 3: the step that small and medium-sized cities open environment interference source is searched MATLAB is:
1, based on early stage test data find out two some X points and Y point, require distance between two points greater than 1 km;
2, input X point and Y point incoming level, the height of the frequency test antenna of the interference source that base station transmitting power will be investigated and the height of base station testing antenna;
3, bring data into village difficult to understand and breathe out in the small and medium-sized cities open environment model formation of tower model, can obtain the interference source place that X point and Y order respectively is a circle;
4, if two circles have intersection point output intersecting point coordinate, if two no intersection points of circle, this method is inapplicable.
Step 4: the step that urban district, big city interference source is searched MATLAB is:
1, based on early stage test data find out two some X points and Y point, require distance between two points greater than 1 km;
2, input X point and Y point incoming level, the height of the frequency test antenna of the interference source that base station transmitting power will be investigated and the height of base station testing antenna;
3, bring data into village difficult to understand and breathe out in urban district, the big city model formation of tower model, can obtain the interference source place that X point and Y order respectively is a circle;
4, if two circles have intersection point output intersecting point coordinate, if two no intersection points of circle, this method is inapplicable.
Step 5: the step that suburb, big city interference source is searched MATLAB is:
1, based on early stage test data find out two some X points and Y point, require distance between two points greater than 1 km;
2, input X point and Y point incoming level, the height of the frequency test antenna of the interference source that base station transmitting power will be investigated and the height of base station testing antenna;
3, bring data into village difficult to understand and breathe out in suburb, the big city model formation of tower model, can obtain the interference source place that X point and Y order respectively is a circle;
4, if two circles have intersection point output intersecting point coordinate, if two no intersection points of circle, this method is inapplicable.
Step 6: the step that big city open environment interference source is searched MATLAB is:
1, based on early stage test data find out two some X points and Y point, require distance between two points greater than 1 km;
2, input X point and Y point incoming level, the height of the frequency test antenna of the interference source that base station transmitting power will be investigated and the height of base station testing antenna;
3, bring data into village difficult to understand and breathe out in the big city open environment model formation of tower model, can obtain the interference source place that X point and Y order respectively is a circle;
4, if two circles have intersection point output intersecting point coordinate, if two no intersection points of circle, this method is inapplicable.
Program flow diagram is seen Fig. 3;
(radio waves propagation model of village difficult to understand-Ha Ta) is set up Mathematical Modeling and is searched interference source to utilize Okumura-hata; Be to use different frequencies, different antennas height in the Tokyo, select different distances to carry out a series of tests by people such as villages difficult to understand; Plotting the median of field strength in experience district at last, is that the basis is revised with the city median of field strength.Also provided corresponding modifying factor for " irregular terrain profiles ".Because the modifying factor that this model provides is more, can under the situation of grasping detailed landform, atural object, obtain predicting the outcome more accurately.China relevant department also advises adopting this model to carry out field intensity prediction in the mobile communication engineering design.
The Okumura-hata model prediction goes out three kinds of path losses under the environment, and model formation can be expressed as:
L
p=A+Blgr city (1)
L
p=A+Blgr-C suburb (2)
L
p=A+Blgr-D open environment (3)
Here L is to be the intermediate value path loss of unit with dB, and r is to be the coverage of unit with the km.The parameter of these formulas depends on operating frequency f
c, transmitting station height h
bThe height h that makes with receiver
m, available empirical equation is expressed as:
A＝69.55+26.16lg?f
c-13.82lgh
b-a(h
m) (4)
B＝44.9-6.55lg?h
b (5)
C＝5.4+2[lg(f
c/28)]
2 (6)
D＝40.94+4.78(lg?f
c)
2-18.33lg?f
c (7)
F wherein
cRepresent h with MHz
bAnd h
mRepresent a (h with rice
m) be the correlation factor that will define below.This model is applicable to the parameter value of following scope:
150MHz＜f
c＜1000MHz
30m＜h
b＜200m
1m＜h
m＜10m
1km＜r＜20km
Wherein parameter A is represented a fixed loss, and he depends on signal frequency, base station height and receiver antenna.A (h
m) be one based on the correlation factor of portable antenna height and be the function of environment.For the big city, a (h
m) be:
a(h
m)＝8.29(lg1.54h
m)
2-1.1dB f
c≤300MHz (8)
a(h
m)＝3.2(lg11.75h
m)
2-4.97dB?f
c＞300MHz (9)
For small and medium-sized cities, in all frequency ranges, a (h
m) be:
a(h
m)＝(1.11lg?f
c-0.7)h
m-(1.56lg?f
c-0.8)dB (10)
The present invention has following advantage:
1, the present invention is easy and simple to handle, safeguards simple;
2, it is fast to search interference source speed, directly the coordinate in location interference source;
3, exercisable landform is many, can apply to comprise urban district, big city, suburb, big city, big city open environment, urban district, small and medium-sized cities, suburb, small and medium-sized cities and six kinds of landform of small and medium-sized cities open environment.
Description of drawings
Fig. 1 Mathematical Modeling figure of the present invention.
Fig. 2 method flow diagram of the present invention.
Fig. 3 method program flow chart of the present invention.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is described further.
Very high if test obtains the interference level in a certain highway section under the situation of single interference source; Get the wherein electric field strength of two points (unit is dBm); Be made as X, Y 2 points; Distance between two points is A, then according to corresponding landform radio waves propagation model, and supposes that base station height and transmitting power are exemplary height and the typical transmit power that China Mobile uses in corresponding landform.Can calculate corresponding launch point is two circles, if be single interference source situation then two circles have two intersection points to be made as A point and B point.And can calculate the coordinate of two intersection points.Just can confirm two possible places of interference source according to the corresponding digital map.Change to confirm it is which point in the test of the above and below of two intersection points based on corresponding level again.Sketch map and deduce mathematical are following:
Based on as figure the rectangular coordinate system modeling:
At the X point, launch point is that a radius is R, and the center of circle is (O, circle O); The equation of this circle is:
x
2+y
2＝R
2 (1)
At the Y point, launch point is that a radius is r, and the center of circle is (A, circle O); The equation of this circle is:
(x-A)
2+y
2＝r
2 (2)
It is that A point and B point calculate this coordinate of 2 and be that these two circles have two intersection points:
Can confirm the coordinate of two points that interference source is possible, respectively test a point in the above and below that A point and B are ordered then and then confirm based on the variation of data which some interference source is positioned at.
Realization in order to demonstrate the invention; Above-mentioned specific embodiment has been described; But other variation of the present invention and modification; It will be apparent to those skilled in the art that, in essence and the people and the modification in the basic principle scope of the disclosed content of the present invention or imitate conversion, all belong to rights protection scope of the present invention.
Claims (8)
1. a GSM-R interference source lookup method is characterized in that comprising the steps:
Set up the Mathematical Modeling that an interference source is searched;
Mathematical Modeling is: very high if test obtains the interference level in a certain highway section under the situation of single interference source; Get the wherein electric field strength of two points; Be made as X, Y 2 points; Distance between two points is LA, then according to corresponding landform radio waves propagation model, and supposes that base station height and transmitting power are exemplary height and the typical transmit power that China Mobile uses in corresponding landform; Can calculate corresponding launch point is two circles, if be single interference source situation then two circles have two intersection points to be made as AA point and BB point; And can calculate the coordinate of two intersection points; Just can confirm two possible places of interference source according to the corresponding digital map; In the test of the above and below of two intersection points, change to confirm it is which point again according to corresponding level; Deduce mathematical is following:
(1) confirm 2 X points and Y point, the distance that requires point-to-point transmission is greater than a km; To be fit to the scope of application of Okumura-hata village difficult to understand-Ha Ta radio waves propagation model;
(2) the relevant parameter input MATLAB program that programming obtains according to Mathematical Modeling with Chosen Point draws the intersection point of two circles and exports intersecting point coordinate.
2. a kind of GSM-R interference source lookup method according to claim 1 is characterized in that: Okumura-hata village difficult to understand-Ha Ta radio waves propagation model dopes three kinds of path losses under the environment, and model formation can be expressed as:
L
p=A+Blgr city;
L
p=A+Blgr-C suburb;
L
p=A+Blgr-D open environment;
Here L
pBe to be the intermediate value path loss of unit with dB, r is to be the coverage of unit with the km, and the parameter of these formulas depends on operating frequency f
c, transmitting station height h
bThe height h that makes with receiver
m, available empirical equation is expressed as:
A＝69.55+26.16lgf
c-13.82lgh
b-a(h
m)；
B＝44.9-6.55lgh
b；
C＝5.4+2[lg(f
c/28)]
2；
D＝40.94+4.78(lgf
c)
2-18.33lgf
c；
F wherein
cRepresent h with MHz
bAnd h
mRepresent a (h with rice
m) be the correlation factor that will define below, this model is applicable to the parameter value of following scope:
150MHz＜f
c＜1000MHz；
30m＜h
b＜200m；
1m＜h
m＜10m；
1km＜r＜20km；
Wherein parameter A is represented a fixed loss, and he depends on signal frequency, base station height and receiver antenna, a (h
m) be one based on the correlation factor of portable antenna height and for the function of environment, for the big city, a (h
m) be:
a(h
m)＝8.29(lg1.54h
m)
2-1.1dB f
c≤300MHz；
a(h
m)＝3.2(lg11.75h
m)
2-4.97dB?f
c＞300MHz；
For small and medium-sized cities, in all frequency ranges, a (h
m) be:
a(h
m)＝(1.11lgf
c-0.7)h
m-(1.56lgf
c-0.8)dB。
3. a kind of GSM-R interference source lookup method according to claim 1 is characterized in that urban district, small and medium-sized cities interference source searches the step of MATLAB and be:
1) based on early stage test data find out two some X points and Y point, require distance between two points greater than 1 km;
2) input X point and Y point incoming level, the height of the frequency of the interference source that base station transmitting power will be investigated, the height of test antenna and base station testing antenna;
3) data are brought in urban district, the small and medium-sized cities model formation of Okumura-hata village difficult to understand-Ha Ta radio waves propagation model, can obtain the interference source place that X point and Y order respectively is a circle;
4) if two circles have intersection point output intersecting point coordinate.
4. a kind of GSM-R interference source lookup method according to claim 1 is characterized in that suburb, small and medium-sized cities interference source searches the step of MATLAB and be:
1) based on early stage test data find out two some X points and Y point, require distance between two points greater than 1 km;
2) input X point and Y point incoming level, the height of the frequency of the interference source that base station transmitting power will be investigated, the height of test antenna and base station testing antenna;
3) data are brought in suburb, the small and medium-sized cities model formation of Okumura-hata village difficult to understand-Ha Ta radio waves propagation model, can obtain the interference source place that X point and Y order respectively is a circle;
4) if two circles have intersection point output intersecting point coordinate.
5. a kind of GSM-R interference source lookup method according to claim 1 is characterized in that small and medium-sized cities open environment interference source searches the step of MATLAB and be:
1) based on early stage test data find out two some X points and Y point, require distance between two points greater than 1 km;
2) input X point and Y point incoming level, the height of the frequency of the interference source that base station transmitting power will be investigated, the height of test antenna and base station testing antenna;
3) data are brought in the small and medium-sized cities open environment model formation of Okumura-hata village difficult to understand-Ha Ta radio waves propagation model, can obtain the interference source place that X point and Y order respectively is a circle;
4) if two circles have intersection point output intersecting point coordinate.
6. a kind of GSM-R interference source lookup method according to claim 1 is characterized in that urban district, big city interference source searches the step of MATLAB and be:
1) based on early stage test data find out two some X points and Y point, require distance between two points greater than 1 km;
2) input X point and Y point incoming level, the height of the frequency of the interference source that base station transmitting power will be investigated, the height of test antenna and base station testing antenna;
3) data are brought in urban district, the big city model formation of Okumura-hata village difficult to understand-Ha Ta radio waves propagation model, can obtain the interference source place that X point and Y order respectively is a circle;
4) if two circles have intersection point output intersecting point coordinate.
7. a kind of GSM-R interference source lookup method according to claim 1 is characterized in that suburb, big city interference source searches the step of MATLAB and be:
1) based on early stage test data find out two some X points and Y point, require distance between two points greater than 1 km;
2) input X point and Y point incoming level, the height of the frequency of the interference source that base station transmitting power will be investigated, the height of test antenna and base station testing antenna;
3) data are brought in suburb, the big city model formation of Okumura-hata village difficult to understand-Ha Ta radio waves propagation model, can obtain the interference source place that X point and Y order respectively is a circle;
4) if two circles have intersection point output intersecting point coordinate.
8. a kind of GSM-R interference source lookup method according to claim 1 is characterized in that big city open environment interference source searches the step of MATLAB and be:
1) based on early stage test data find out two some X points and Y point, require distance between two points greater than 1 km;
2) input X point and Y point incoming level, the height of the frequency of the interference source that base station transmitting power will be investigated, the height of test antenna and base station testing antenna;
3) data are brought in the big city open environment model formation of Okumura-hata village difficult to understand-Ha Ta radio waves propagation model, can obtain the interference source place that X point and Y order respectively is a circle;
4) if two circles have intersection point output intersecting point coordinate.
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| CN101986742B (en) * | 2010-09-26 | 2013-04-24 | 北京交通大学 | Railway marshalling stations and GSM-R network planning method |
| CN103926494B (en) * | 2014-04-30 | 2016-09-07 | 国家电网公司 | A kind of determination method and device of interference source |
| CN106332115B (en) * | 2015-06-23 | 2019-07-02 | 中国移动通信集团山东有限公司 | A kind of Intermodulation Interference localization method, device and system |
| CN109660935B (en) * | 2018-11-27 | 2020-12-18 | 南通先进通信技术研究院有限公司 | Interference positioning method for base station side array antenna system |
| CN111541986B (en) * | 2019-01-22 | 2022-09-09 | 博彦科技股份有限公司 | Positioning method, positioning device, storage medium and processor |
| WO2023012859A1 (en) * | 2021-08-02 | 2023-02-09 | 三菱電機株式会社 | Data processing device, data processing method, and data processing program |
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| CN1618247A (en) * | 2002-01-25 | 2005-05-18 | 艾利森电话股份有限公司 | Method for interference source identification |
| CN1794690A (en) * | 2006-01-12 | 2006-06-28 | 北京交通大学 | Method of realizing locomotive signal principalization using radio locomotive signal |
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| CN1618247A (en) * | 2002-01-25 | 2005-05-18 | 艾利森电话股份有限公司 | Method for interference source identification |
| CN1794690A (en) * | 2006-01-12 | 2006-06-28 | 北京交通大学 | Method of realizing locomotive signal principalization using radio locomotive signal |
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| Title |
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| 高晨亮,朱刚,钟章队,周贤伟.GSM_R电磁干扰及测试问题研究.《铁道通信信号》.2007,第43卷(第10期), * |
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