A method for selecting the location of an exploration radio station based on a GIS system

Abstract

The present invention discloses a method for selecting a location for an exploration radio station based on a GIS system, comprising the following steps: Step 1, construct a GIS system and import DEM, DSM and all radio wave receiving point data; Step 2, place a simulated radio station; Step 3, calculate the path loss value during the propagation of radio waves from a certain simulated radio station to a certain radio wave receiving point; Step 4, repeat Step 3 to calculate the path loss values during the propagation of radio waves from a certain simulated radio station to all radio wave receiving points, and calculate the signal coverage rate of this simulated radio station; Step 5, repeat Steps 3 and 4 to calculate the signal coverage rates of all simulated radio stations. By importing the location information of several radio wave receiving points into the GIS system and introducing two parameters N and Q based on the Egli model formula to improve the algorithm accuracy, the present invention finally obtains more accurate location information of the exploration radio station, meets the application requirements, and greatly improves the success rate and efficiency of the exploration radio station location selection.

Description

Technical Field

[0001] The present invention relates to a method for selecting a location for an exploration radio station, and more particularly to a method for selecting a location for an exploration radio station based on a GIS system. Background Art

[0002] In seismic exploration, a radio station is required to trigger the seismic source. However, due to the severe blocking and attenuation of the radio station signal in mountainous construction areas, a large amount of time and labor costs are usually required to select the radio station location.

[0003] Currently, the selection of the exploration radio station location either relies on the experience of technical personnel or uses the traditional location selection method of mobile base stations. The former lacks a scientific basis and will be gradually phased out, while the latter is the main current method for selecting the exploration radio station location.

[0004] The traditional location selection methods of mobile base stations mainly include two types. One is to use Global Mapper (GlobalMapper is a mapping software that can not only display data as raster maps, elevation maps, vector maps, but also edit, convert, print, record GPS and utilize the GIS functions of data) for base station location selection. The other is a new type of mobile base station location selection based on GIS (i.e., Geographic Information System) technology.

[0005] Among them, using Global Mapper for base station location selection is mainly used for base station location selection in early hilly and mountainous terrains and is also a commonly used method for selecting the exploration radio station location at present. However, it has the following defects: The main method is the line-of-sight method, that is, to judge whether there is a mountain block between the base station and the location. If there is a mountain block, it is judged that the signal cannot be covered. This method has great limitations, has very limited reference significance, low scalability, cannot be applied to various terrains, and requires finding the high point by the naked eye. When selecting the location, the SPS data of the receiving point cannot be imported, and the target is not strong.

[0006] The new mobile base station site selection based on GIS technology is a relatively new method for base station site selection. For example, in the invention patent with the publication number "CN111669764A" and the name "New Mobile Base Station Site Selection Method, System and Computer Equipment Based on GIS Technology", GIS spatial database technology is adopted to construct a working database for mobile base station site selection; comprehensively considering electromagnetic communication characteristics and urban planning conditions for mobile base station site selection and layout, starting from the site selection method, effectively solving the problem that it is difficult to implement the previous base station site after layout; at the same time, using GIS spatial analysis methods and GIS random point space creation algorithms to realize the delimitation of the site selection range of new mobile base stations and the automatic layout of new mobile base stations, greatly saving the manpower and material resources invested in mobile base station site selection and layout, and improving the efficiency of the site selection work for building stations. However, this patent also has the following defects: only considering the range characteristics of the base station, not considering from the aspect of the target result. However, in the seismic exploration industry, the required receiving points are irregular and large in number, and this system cannot import the antenna height and actual position of the receiving points and cannot directly refer to the reference; at the same time, its functionality is limited and the operation is relatively complex. Summary of the Invention

[0007] The purpose of the present invention is to provide a GIS system-based exploration radio station site selection method for importing a large amount of receiving point data to solve the above problems.

[0008] The present invention achieves the above purpose through the following technical solutions:

[0009] An exploration radio station site selection method based on a GIS system includes the following steps:

[0010] Step 1: Construct a GIS system using PostgreSql and PostGis databases and import basic data into the system: First, import DEM and DSM, and then import all radio wave receiving point data in the SPS file format.

[0011] Step 2: Place simulated radio stations at multiple visually estimated high points or multiple points recommended by the system in the GIS system, and import or input the position information of each simulated radio station.

[0012] Step 3: Calculate the path loss value L during the propagation of radio waves from a certain simulated radio station to a certain radio wave receiving point according to the following formula b :

[0013]

[0014] where d is the distance between a certain simulated radio station and a certain radio wave receiving point, in km, f is the frequency of the radio wave, in MHz, h b is the height of the antenna of this simulated radio station from the ground, in m, h m$h_a$ is the height of the antenna at the radio wave receiving point from the ground, with the unit of m; $h_{aver}$ is the average height of hills and mountains, with the unit of m; $N$ is the number of radio wave receiving points in the mountains on the path from the simulated radio station to the radio wave receiving point; $Q$ is a fine-tuning coefficient, specifically the influence weight of the number of radio wave receiving points through which the radio wave passes through the mountain.

[0015] Step 4: Repeat Step 3 to calculate the path loss value $L$ during the propagation of radio waves from a certain simulated radio station to all radio wave receiving points. b , obtain the number of radio wave receiving points that can effectively receive the radio wave signal of the simulated radio station according to the preset loss value standard, divide the obtained value by the number of all radio wave receiving points, convert the obtained value into a percentage, and obtain the signal coverage rate of the simulated radio station.

[0016] Step 5: Repeat Step 3 and Step 4 to calculate the signal coverage rates of all simulated radio stations, sort them in descending order, and display them on the user interface. Based on this, the user combines other factors to comprehensively make a decision to select one or more simulated radio stations as exploration radio stations, and export the location information of the exploration radio stations to complete the selection of exploration radio stations.

[0017] Preferably, the accuracy of the DEM and DSM is 12.5 m.

[0018] In the above content, PostgreSql is a feature-complete object-relational database management system (ORDBMS) of free software, which is an object-relational database management system based on POSTGRES, version 4.2 developed by the Computer Department of the University of California; PostGis is an open-source program, which is an extension of the object-relational database PostgreSql, providing support for storing spatial data, making PostgreSql a spatial database capable of spatial data management, quantity measurement, and topological analysis; DEM is the abbreviation of Digital Elevation Model, that is, Digital Elevation Model. It realizes the digital simulation of the ground terrain through limited terrain elevation data (that is, the digital expression of the terrain surface form). It is a kind of solid ground model representing the ground elevation in the form of an ordered numerical array and is a branch of the digital terrain model DTM (Digital Terrain Model); DSM is the abbreviation of Digital Surface Model, that is, Digital Surface Model. It refers to a ground elevation model that includes the heights of surface buildings, bridges, trees, etc. Compared with DEM, DEM only contains the elevation information of the terrain and does not contain other surface information. DSM further covers the elevation of other surface information except the ground on the basis of DEM; SPS is the abbreviation of Shell Processing Support, which is the standard format for the position data and geographic information data of physical points in the seismic exploration industry formulated by the SEG Technical Standards Committee. The SPS file can reflect the longitude and latitude positions of the signal receiving points (physical points) and the map projection conversion parameters. The data items include the line number, point number, longitude, latitude, elevation, shot point type, etc. of the physical points.

[0019] The beneficial effects of the present invention are as follows:

[0020] By importing the position information of several radio wave receiving points into the GIS system in the present invention, the number of radio wave receiving points can be as many as tens of thousands or even more than one hundred thousand. On this basis, the calculation formula of the Egli model (i.e., the Egli model) is used for reference, and two parameters N and Q are introduced into the formula to improve the algorithm accuracy. Finally, more accurate exploration radio station position information is obtained. After field tests, the accuracy rate can reach more than 90% in the specified project, which is simple and easy to use, meets the application requirements, enables operators to efficiently select references, and greatly improves the success rate and efficiency of the exploration radio station site selection. In addition, the site selection experience of the present invention can be replicated. The present invention provides an algorithm fine-tuning slider on the user interface to adjust the Q value. After long-term application accumulation, the algorithm correction values under different terrains can be recorded, so as to accumulate the algorithm correction experience under different mountain undulation degrees; at the same time, the site selection locations can be recorded in the project management of this system, and the point positions can be reused during the secondary exploration. Brief Description of the Drawings

[0021] Figure 1 is the system architecture diagram adopted by the exploration radio station site selection method based on the GIS system of the present invention;

[0022] Figure 2 is the user interface diagram related to parameter setting and algorithm fine-tuning slider adopted by the exploration radio station site selection method based on the GIS system of the present invention;

[0023] Figure 3 is the user interface diagram of the point recommendation sorting list adopted by the exploration radio station site selection method based on the GIS system of the present invention, where the points are the positions of the simulated radio stations. Detailed Implementation Manner

[0024] The present invention will be further described below with reference to the accompanying drawings:

[0025] The exploration radio station site selection method based on the GIS system of the present invention includes the following steps:

[0026] Step 1: Construct a GIS system using PostgreSql and PostGis databases, and its system architecture is as Figure 1 shown. Import basic data into the system: First, import DEM and DSM, and then import all radio wave receiving point data in SPS file format; elevation data is the basis for algorithm calculation. Only with elevation data can the heights corresponding to mountains and depressions at each point in the target area be reflected. After research and testing, the balance point between calculation efficiency and accuracy is taken, and the accuracy of DEM and DSM is selected as 12.5m; the SPS file format is the standard format for the position data and geographic information data of physical points in the seismic exploration industry formulated by the SEG Technical Standards Committee. The SPS file can reflect the longitude and latitude positions of signal receiving points (physical points) and map projection conversion parameters. The data items include the line number, point number, longitude, latitude, elevation, shot point type, etc. of the physical points. The SPS file is also the calculation basis of this system. Combining the characteristics of the seismic exploration industry, this system imports hundreds of thousands of radio wave receiving points into the GIS system at one time, so that the propagation path from the simulated radio station to each radio wave receiving point can be established, making the calculation more refined and the targeting stronger;

[0027] Step 2: Place simulation radios at multiple visually estimated high points of the GIS system or multiple points recommended by the system, and import or input the location information of each simulation radio, including manually inputting longitude and latitude, importing KML (a file used to exchange geographical data in the GOOGLE Maps browser. The KML file is based on XML and defines some TAGs for specifying the display method of geographical data. Geographical features that can be defined by KML include locations, descriptions, overlays, paths, and polygons, etc.); at the same time, complete the selection of basic parameters as needed, such as the radio coverage range, antenna height, target area range, etc.;

[0028] Step 3: Calculate the path loss value L during the propagation of radio waves from a certain simulation radio to a certain radio wave receiving point according to the following formula b :

[0029]

[0030] where d is the distance between a certain simulation radio and a certain radio wave receiving point, with the unit of km, f is the frequency of the radio wave, with the unit of MHz, h b is the height of the antenna of this simulation radio from the ground, with the unit of m, h m is the height of the antenna of this radio wave receiving point from the ground, with the unit of m, haver is the average height of hills and mountains, with the unit of m, N is the number of radio wave receiving points in the mountains on the path from this simulation radio to this radio wave receiving point, Q is a fine-tuning coefficient, specifically the influence weight of the number of radio wave receiving points through which the radio wave passes through the mountain; the user interface related to parameter settings and algorithm fine-tuning sliders is as Figure 2 shown, and the user can directly operate on this interface;

[0031] The above algorithm is the mountain ultra-short wave propagation algorithm. This algorithm is the core of the calculation task. This algorithm is based on the Egli model and is generally applicable to the ultra-short wave propagation calculation with a propagation distance d of 0 - 64 km, a frequency f of 40 - 400 MHz, and a mountain height fluctuation of 0 - 120 m. By establishing a straight line path from the location of the simulation radio to the radio wave receiving point, and calculating the number N of radio wave receiving points through which this straight line path passes through the mountain, multiplying N by the fine-tuning coefficient Q as a correction factor and adding it to the algorithm to make the algorithm more accurate; through cloud server calculation, it can achieve the measurement of 30,000 radio wave receiving points in 10 seconds;

[0032] Step 4: Repeat Step 3 to calculate the path loss value L during the propagation of radio waves from a certain simulation radio to all radio wave receiving points b, obtain the number of radio wave receiving points that can effectively receive the radio wave signal of the analog radio according to the preset loss value standard, divide this number by the number of all radio wave receiving points, convert the obtained value into a percentage to get the signal coverage rate of the analog radio. The radio wave receiving points that cannot effectively receive the radio wave signal of the analog radio are generally called blind spots;

[0033] Step 5: Repeat Step 3 and Step 4, calculate the signal coverage rates of all analog radios, sort them in descending order, and display them on the user interface. As Figure 3 shown. At the same time, the results can also be displayed on a 3D map. The radio wave receiving points that can effectively receive the radio wave signal of the analog radio, that is, the radio wave receiving points covered by the signal, can be displayed in blue, and the radio wave receiving points that cannot effectively receive the radio wave signal of the analog radio, that is, the signal blind spots, can be displayed in red. Users can clearly observe whether the coverage meets the construction requirements at a glance. On this basis, users can comprehensively consider other factors (such as road conditions, construction conditions, etc.) and make a decision to select one or more analog radios as exploration radios, and export the location information of the exploration radios, preferably export KML data, to complete the site selection of the exploration radios.

[0034] Note: Figures 1 - 3 The specific content in [] is determined according to actual needs, as long as it can meet the above functional requirements, and no specific description is made here.

[0035] The above embodiments are only preferred embodiments of the present invention and do not limit the technical solutions of the present invention. Any technical solutions that can be achieved on the basis of the above embodiments without creative labor shall be regarded as falling within the scope of the patent rights of the present invention.

Claims

1. A method for locating exploration radio stations based on a GIS system, characterized in that: Including the following steps: Step 1: Construct a GIS system using PostgreSql and PostGis databases, and import basic data into the system: First, import DEM and DSM, and then import all radio wave receiving point data in SPS file format; Step 2: Place simulation radios at multiple visually observed high points in the GIS system or multiple points recommended by the system respectively, and import or input the location information of each simulation radio; Step 3, calculate the path loss value during the propagation of radio waves from a certain analog radio station to a certain radio wave receiving point according to the following formula L b : ； Among them, d is the distance between a certain analog radio station and a certain radio wave receiving point, with the unit of km, f is the frequency of the radio wave, with the unit of MHz, h b is the height of the antenna of the analog radio station from the ground, with the unit of m, h m is the height of the antenna of the radio wave receiving point from the ground, with the unit of m, haver is the average height of hills and mountains, with the unit of m, N is the number of radio wave receiving points in the mountain body on the path from the analog radio station to the radio wave receiving point, Q is the influence weight of the number of radio wave receiving points where the radio wave passes through the mountain body; Step 4: Repeat Step 3 to calculate the path loss value during the propagation of radio waves from a certain analog radio station to all radio wave receiving points. L b , obtain the number of radio wave receiving points that can effectively receive the radio wave signal of the analog radio station according to the preset loss value standard, divide the obtained value by the number of all radio wave receiving points, convert the obtained value into a percentage, and obtain the signal coverage rate of the analog radio station. Step 5: Repeat Step 3 and Step 4, calculate the signal coverage rates of all simulation radios, sort them in descending order, and display them on the user interface. The user selects one or more simulation radios as exploration radios, exports the location information of the exploration radios, and completes the site selection of the exploration radios.

2. The exploration radio station site selection method based on the GIS system according to claim 1, characterized in that: In Step 1, the accuracy of the DEM and DSM is 12.5m.

Images