A novel multi-class classification method named the voting-cross support vector machine (SVM) method was proposed in this study, for classifying vehicle targets in wireless sensor networks. The advantages and disadvantages of available methods were summarized, after a comparative analysis of commonly used multi-objective classification algorithms. To improve the classification accuracy of multi-class classification and ensure the low complexity of the algorithm for engineering implementation on wireless sensor network (WSN) nodes, a framework was proposed for cross-matching and voting on the category to which the vehicle belongs after combining the advantages of the directed acyclic graph SVM (DAGSVM) method and binary-tree SVM method. The SVM classifier was selected as the basis two-class classifier in the framework, after comparing the classification performance of several commonly used methods. We utilized datasets acquired from a real-world experiment to validate the proposed method. The calculated results demonstrated that the cross-voting SVM method could effectively increase the classification accuracy for the classification of multiple vehicle targets, with a limited increase in the algorithm complexity. The application of the cross-voting SVM method effectively improved the target classification accuracy (by approximately 7%), compared with the DAGSVM method and the binary-tree SVM method, whereas time consumption decreased by approximately 70% compared to the DAGSVM method.

Pulsed power technology plays a crucial role in the frontier fields. Its systems are evolving towards modularization and distribution, and high-precision synchronous triggering is required for the cooperation of multiple modules. Traditional centralized triggering systems can hardly meet the requirement of nanosecond-level global synchronization in complex scenarios. Moreover, the existing low-jitter triggering technologies also have many limitations, which have restricted the development of pulsed power systems towards higher energy levels. This article analyzes the mechanism of jitter generation in a distributed synchronous triggering system and constructs a mathematical model. The experiment conducted a significance test, with a normal distribution of 0.5 and an average distribution of 0.1457. So we verify the model through experimental analysis.