Research On Embedded Geomagnetic Field Vector Query Technology

In modern warfare,intelligentization is the development trend of ammunition in the future.Two-dimensional ballistic fuze is an important direction for the intelligent development of conventional ammunition.Because of its stability,the geomagnetic field is suitable as a benchmark for various applications.The attitude angle of the two-dimensional ballistic fuze is adjusted on the condition of geomagnetic information,so it is necessary to study the geomagnetic field query technique.According to the requirements of a certain type of vehicle-borne anti-aircraft missiles,the geomagnetic query system with geomagnetic query and signal control functions and an onboard analytical prototype with analytical storage is designed.First,based on the model values and measured values,the differences between the IGRF and WMM models are studied.The results show that the WMM model performs better than the IGRF model.The influence of parameters such as latitude and longitude change,time and height on the geomagnetic field is analyzed.Under the 50 km range and 10 km height,the geomagnetic field changes less than 1%.Secondly,according to the attitude angle calculation formula,the direct contrast and the derivative comparison are used to analyze the initial geomagnetic component to the attitude angle error,and the calculation formula of the influence error is derived.The error result indicates that the initial geomagnetic component has an integrated error of 0.5° under the 500 nT error.The software calculation of model method and interpolation method of calculating geomagnetic component are realized.The research shows that the model method has good universality for global calculation,and there may be large errors in local;the interpolation method is excellent for local processing.Finally,the prototype is designed and verified by the positioning and solving experiments.The results show that the geomagnetic component calculated by the embedded MCU meets the requirements.