In view of the complexity, high dynamic, network harshness, resource limitation, strong antagonism and high damage in the environment of edge information service nodes, and the resources and capabilities of nodes are different greatly, this paper proposes a continuous support oriented edge service random access technology. Firstly, the security authentication architecture model for edge nodes is constructed, and the cross node access authentication technology in mobile environment is adopted to realize the random access capability of mobile users between cloud edges and edge edges. Secondly, the service / data continuous guarantee mechanism for edge nodes is established. By designing the mobile edge computing architecture and combining with the data migration strategy for network transmission, the edge node's random encounter, cross node access and service / data continuity guarantee capability in mobile environment are improved. Finally, an experimental environment covering network simulation environment, cloud center environment and edge information service environment is built. The experimental results verify the effectiveness and feasibility of the edge service casual access technology for continuous support.
Based on the study of earth infrared radiation and further requirement of anticloud interference ability for a spinning projectile’s infrared attitude measurement, a compensation method of cloud infrared radiation interference is proposed. First, the theoretical model of infrared radiation interference is established by analyzing the generation mechanism and interference characteristics of cloud infrared radiation. Then, the influence of cloud infrared radiation on attitude angle is calculated in the following two situations. The first situation is the projectile in cloud, and the maximum of roll angle error can reach ± 20 deg. The second situation is the projectile outside of cloud, and it results in the inability to measure the projectile’s attitude angle. Finally, a multisensor weighted fusion algorithm is proposed based on trust function method to reduce the influence of cloud infrared radiation. The results of semiphysical experiments show that the error of roll angle with a weighted fusion algorithm can be kept within ± 0.5 deg in the presence of cloud infrared radiation interference. This proposed method improves the accuracy of roll angle by nearly four times in attitude measurement and also solves the problem of low accuracy of infrared radiation attitude measurement in navigation and guidance field.
Microinertial sensors currently cannot provide long-term stability attitude information for a spinning projectile because of drift error. An attitude measuring method of a spinning projectile based on the background magnetic field (BMF) compensation is presented. The effect of the BMF is discussed, with particular attention to its implications for magnetometer-based attitude measuring. First, a compensation model of the BMF is established. Then, the error in measuring attitude caused by the BMF is analyzed using a theoretical model and numerical simulation. An attitude measuring algorithm for the spinning projectile based on the intersection ratio of magnetic sensors is proposed. Finally, semiphysical experiments are carried out to prove the effectiveness of this attitude measurement method. The experiment results indicate that the error of attitude angles is within ±1 deg and the attitude angle error of the combined magnetic sensors is not cumulated. Compared with the traditional geomagnetic attitude measurement method, the accuracy of our method is improved, which can be used for the trajectory correction of simple guided ammunition.
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