FPGA Design And Algorithm Research Of Interference Detection And Location Equipment For Power Wireless Private Network

The construction of a power wireless private network with a variety of wireless access technologies can greatly promote the development of smart distribution grids,and LTE-based broadband wireless access technology can provide security for the access of various service information for smart distribution.Stable and reliable communication channel guarantee.However,in recent years,due to the fact that the authorized frequency points of 230 digital radio stations and the LTE230 power wireless private network are frequently occupied by unauthorized users,the electromagnetic environment in the 230 MHz frequency band is complicated,there are many types of interference sources,and the frequency band resource utilization rate is low.Restrict the development of LTE230 power wireless private network construction.Compared with the traditional method of relying on experienced staff on-site interference investigation and analysis of interference sources,combined with signal detection and direction finding positioning technology in electronic reconnaissance technology,it can effectively improve the accuracy and response speed of interference detection and positioning,saving human resources..Therefore,there is an urgent need to carry out research on key technologies for interference detection and location of power wireless private networks.This article discusses and analyzes in detail the use of LTE230 frequency band resources and related signal detection and positioning algorithms in electronic reconnaissance.For the interference sources occupying the authorized frequency points of the power wireless private network in the 230 MHz frequency band,FPGAs related to interference detection and positioning are completed And algorithm design.First,the sub-channel division method is used to achieve a 229 MHz ± 8.192 MHz bandwidth frequency sweep analysis,and the interference detection of the occupied power wireless private network authorized frequency point is completed according to the energy detection algorithm;then,the scope of the interference search range is modeled,and The model based on the 230 MHz base station coverage distance divides the scene evenly with a grid.Carry out drive test simulation on each grid node and on the planned path between nodes.Extract the parameters of the drive test acquisition signal at each node: the center frequency point of the interference signal,bandwidth,received signal strength,incoming signal azimuth,etc.And select the four with the same center frequency point and bandwidth and larger received signal strength The node calculates the triangular positioning of the Brownian least squares based on the azimuth measurement value;while on the planned path,the observation platform keeps moving at a constant speed,and uses the phase difference change rate positioning algorithm to measure the estimated position of the interference source in real time.Finally,take the result of triangular positioning as the initial value of the average drift shift,and take the area circle of a certain radius,find the densest area circle among all the estimated positioning points of the phase difference change rate,and then take the average of the positioning points measured in the circle.Estimation of interference source location.By analyzing project requirements,the work completed in this paper includes interference detection and positioning equipment scheme design and hardware platform construction,bandwidth sweep frequency Simulink simulation design and FPGA channelization program simulation design,FPGA data cache and transmission logic control program design,frequency sweep Function module and data cache,function verification and performance test of transmission module,and simulation of positioning algorithm discussed and analyzed in the article.A positioning algorithm combining Brownian least squares and phase difference rate is proposed to ensure the accuracy of the final interference positioning.The FPGA program and positioning algorithm of the power wireless communication interference detection and positioning device designed in this paper are simulated and analyzed.The results show that the interference source that occupies the authorized frequency point in the 230 MHz frequency band can be correctly detected and has high positioning accuracy.Provide technical support for the detection,investigation and location of interference in the power wireless private network.