Research On The Location Method Of Base Station Based On Communication Visibility Area

Terrain visible domain refers to the terrain area seen or visible around a certain viewpoint,and it is widely used in landscape analysis,ancient village layout,site selection and path planning and other fields.The communication visual field is a special case of the terrain visual field,which refers to the area where a transmitting antenna is set up at a certain point on the terrain,and the receiving antenna can receive the signal at the peripheral point of the transmitting antenna.The visual field of communication is based on the propagation of wireless electromagnetic signals,and it is judged whether it is visible based on obstacles on the transmission path based on the line of sight of the transmitting end and the receiving end.The visual field of communication can be used to judge applications such as relay communication path planning,transmission tower location planning,etc.It is of great significance to the optimization modeling and calculation methods involved in the planning.This thesis carries out research work such as communication visual field calculation,location planning and the content mainly includes the following three aspects.1.Research on calculation method of communication visual field.The purpose of the communication visual domain analysis algorithm is to solve the communication reachability,and to provide a method for calculating the communication visual domain on the terrain based on the line of sight,and to transfer the terrain from the transmitting point antenna to the receiving antenna on the receiving point of other terrain points.The method of sight and signal reflection or diffraction mechanism performs signal intensity calculation to determine whether the signal is reachable.According to the electromagnetic field propagation mechanism,a first Fresnel zone is constructed between the transmitting antenna and the receiving antenna,and the communication signal attenuation value on each grid unit on the line of sight path connecting the transmitting point and the receiving point is gradually calculated,and the total signal attenuation is calculated The cumulative value is used to determine whether communication is possible,and finally the signal accessibility of a grid with a given range on the terrain centered on the transmitting point is completed to obtain the communication visual field of the transmitting point.Experiments have shown that it has a good communication visibility field at a suitable height of antenna and wavelength.2.Research on the selection algorithm of candidate observation points based on the communication visual domain.The site selection goal of the communication visual field is to cover the largest possible area after retaining a given number of observation points.The candidate observation point screening algorithm based on the communication visual field first takes the terrain feature points as candidate observation points,then performs K-medoids clustering on them,sorts the points in the cluster according to the communication visual field quality,and finally uses the filtering algorithm to filter out For points with low communication horizon quality,a given number of candidate observation points are reserved.The algorithm in this paper not only considers the problem of repetition of the communication horizons between points,but also considers the problem that some areas cannot be assigned to candidate observation points.Experiments show that this algorithm is better than the comparison experiment algorithm in terms of total communication view coverage,running time and repetition rate.3.Using a variety of terrain data sets to verify the effectiveness of the communication visual field analysis algorithm and the candidate observation point screening algorithm based on the communication visual field,and compare the coverage of different visual field algorithms with other similar algorithms.The overlap rate actually verifies the practicability of the communication visual domain analysis algorithm and the efficiency of the candidate observation point screening algorithm based on the communication visual domain.