Abstract With the rapid development of technologies such as the Internet of Things and artificial intelligence, indoor spatial navigation has gradually become a research hotspot. In the field of indoor navigation, geomagnetic navigation, as an emerging technology with high positioning accuracy and stability, is widely used in fields such as smart homes and robots. In order to better leverage the advantages... With the rapid development of technologies such as the Internet of Things and artificial intelligence, indoor spatial navigation has gradually become a research hotspot. In the field of indoor navigation, geomagnetic navigation, as an emerging technology with high positioning accuracy and stability, is widely used in fields such as smart homes and robots. In order to better leverage the advantages of geomagnetic navigation, this article studies the application of indoor geomagnetic digital maps and Vitby algorithm in spatial navigation path analysis. This article studies the application of indoor geomagnetic digital maps and Vitby algorithm in spatial navigation path analysis. By constructing an indoor geomagnetic digital map and utilizing the Vitby algorithm for path planning, precise navigation of indoor spaces has been achieved. This method can provide important technical support for indoor navigation, smart home, robotics and other fields. Read More Read Less

Abstract We have addressed the practical time-frequency analysis of large dynamic range signals with improvement. We have used the PULSE 12 data acquisition hardware to study the acoustic signals from unique bells. We have discussed these objects’ mechanical and acoustic properties and extensively studied their features. Finally, we have advocated the specific techniques of visualization.... We have addressed the practical time-frequency analysis of large dynamic range signals with improvement. We have used the PULSE 12 data acquisition hardware to study the acoustic signals from unique bells. We have discussed these objects’ mechanical and acoustic properties and extensively studied their features. Finally, we have advocated the specific techniques of visualization. Read More Read Less

Abstract To ensure better access to the VoIP service to all end-users, we need a better performance of cognitive radio networks for dynamic spectrum. In this paper, we presented a new cognitive network paradigm, where some licensed channels are available to unlicensed users by cognitive functionality. We have presented the extensive results and further highlighted the meaningful inferences.... To ensure better access to the VoIP service to all end-users, we need a better performance of cognitive radio networks for dynamic spectrum. In this paper, we presented a new cognitive network paradigm, where some licensed channels are available to unlicensed users by cognitive functionality. We have presented the extensive results and further highlighted the meaningful inferences. Read More Read Less