Research On Ground-based Navigation System Layout Strategy And Guidance Precision Analysis Of GNSS

In modern warfare,precision-guided weapons can greatly enhance the efficiency of combat,which attracts many countries.China's precision-guided weapons using inertial guidance mode assisted by ground-based guidance and satellite guidance,its performance of damage relies on the size of the effectiveness and ability to complete the established task.In order to assist the commander in drafting the mission of missile attack and guarantee the combat,this paper aims to optimize the ground station layout strategy of ground-based guidance by using PDOP as a measure of missile guidance,and to analyze and study the navigation guidance precision of GNSS Methods,the main work of the paper is as follows:1.Based on the theory and evaluation method of ground-based navigation system,the traditional PDOP value calculation theory is deepened,and the mathematical model and calculation of PDOP value of missiles under ground-based navigation system and "inverted toad" system under practical effective communication conditions are studied Process.The distribution of the guidance precision distribution and the strong stability of the ground-based guidance in different base stations and the layout of the ground stations under different ground stations are analyzed.The rules of the distribution of the ground stations and the PDOP values are summarized,and a set of ground stations Method strategy to help guide the troops to establish networking,site selection and improved distribution.2.The navigation guidance accuracy of the three GNSS systems is analyzed,and the influence of guidance ability and guidance on the guidance ability in satellite health is studied.The GNSS guidance of the area of concern in Southeast China is analyzed and analyzed.Some satellites can observe the relationship between the number of satellites and the GNSS guidance ability,which can effectively guide the preparation and preparation of missile combat missions and assist in the development of missile guidance strategy.3.In order to optimize the GNSS guidance calculation,a star selection algorithm for multi-system is proposed,and an optimization strategy is developed for the situation of satellite fault.After verification,the method is validated.The algorithm can meet the requirement of guidance precision,and the calculated result is less than 1 with the optimal PDOP value.Can reduce the load on the computer load,with practical value.4.Using the GNSS ephemeris file,the GNSS system uses the least squares parameter fitting algorithm,the fourth order Runge-Kutta numerical integration and the Lagrangian polynomial interpolation method to predict the guidance precision after 7 days.The results show that the broadcast ephemeris And the results of precision ephemeris to meet the needs of the guidance accuracy,the forecast results are stable.Help to ensure the development of combat programs,and the calculation is simple and quick,easy access to data,there is a great practical value,suitable for military use.