Research And Implementation Of Shortwave Land-based Positioning System Simulation Platform

In modern society,whether it is daily life or military activities,it is necessary to keep information communication smooth at all times and be able to determine the geographic location where you are,that is,to obtain location information.Because short waves can propagate thousands of miles away through ionospheric reflection,and do not require relay stations,and the ionosphere is basically indestructible and always exists,so short wave positioning has other advantages that can not be compared with other positioning methods.Short-wave positioning has the characteristics of long positioning distance,strong anti-destructive ability,low cost,easy to carry,etc.It has good application prospects in civil and military.According to the needs of short-wave long-distance positioning technology,this paper analyzes the error problems in long-distance positioning,studies and simulates the plane projection algorithm,Mercator projection algorithm and spherical positioning algorithm,and develops an error correction algorithm based on the spherical positioning algorithm,and A set of short-wave land-based positioning system simulation platform is designed;the accuracy of the error correction algorithm is verified by carrying out field experiments to solve the error problem in long-distance positioning.This paper first analyzes short-wave positioning algorithms such as plane projection algorithm,Mercator projection algorithm,and spherical positioning algorithm,and gives the general scope of application of various algorithms.Due to the distance between the transceiver station and the earth's spherical characteristics,the arrival angle of the incoming wave at the receiving station is not equal to the emission angle of the radio wave at the transmitting station.If the two are directly replaced by the same angle,it will inevitably bring to the positioning result.For larger errors,an error correction algorithm based on the spherical positioning algorithm is proposed;and the realization of the algorithm and simulation experiments are completed.For different transmission and reception orientations,the positioning operation of the algorithm is completed and the error statistics of the positioning results are analyzed.Through comparative analysis,you can It is found that the error correction algorithm of the spherical positioning algorithm can complete the correction of the error,and the accuracy is greatly improved.Based on the short-wave positioning algorithm,the design and development of the short-wave land-based positioning system simulation platform is completed.The simulation platform considers the characteristics of short-wave propagation in the ionosphere.The introduction of the ionospheric error analysis module can obtain the trajectory of the radio wave propagation process.The ionosphere causes errors caused by the deflection of radio waves;it can also analyze the problems that radio signals are affected by the natural environment during propagation,causing radio wave loss and other factors that affect the reception results;and conduct field detection experiments and import the received radio wave data into the platform for analysis.Using this platform,the functional verification of theoretical algorithms can be achieved,positioning is completed and accuracy results are given.Finally,the short-wave land-based positioning system simulation platform was used to carry out field detection experiments based on non-cooperative source data and cooperation source data.The actual measurement function of the simulation platform and the error correction algorithm of the spherical positioning algorithm were tested and verified.Simulation platform function.According to the accuracy of the results of the two experimental methods,the receiving experiment based on the cooperation source data can obtain more accurate DOA information and obtain more accurate positioning results.In summary,this paper develops an error correction algorithm based on the spherical positioning algorithm,which solves the error problem in long-distance positioning.And through the corresponding simulation and data processing results,the accuracy of the algorithm is verified.At the same time,a short-wave land-based positioning system simulation platform was designed,and then field experiments were carried out on the basis of laboratory equipment to realize the functional verification and data analysis of the simulation platform.