| Sumario: | This study addresses the critical unmet need for abscondment detection systems to enhance community access and safety for children with autism. We present the development of a proof-of-concept device that identifies user needs, establishes testing methodologies, and explores the technical challenges in creating a practical solution. Through a structured approach, user requirements and device specifications were established, leading to the creation of a phase-based 2.4 GHz distance-ranging prototype. A series of laboratory-based verification experiments demonstrated significant performance improvements using filtering and alert-triggering mechanisms to mitigate the limitations of phase-based ranging. Although body obstruction remains a challenge, this can potentially be addressed through further co-design with end users. The user-centered design process and experimental framework outlined in this work provide a valuable foundation for researchers seeking to advance abscondment detection technologies for children with autism. IMPLICATIONS FOR REHABILITATION: Enhancing Safety for Children with Autism: This research highlights the potential of reliable abscondment detection systems to mitigate safety risks, addressing a critical challenge faced by children with autism and their families. Framework for Future Innovations: The study establishes a robust foundation for advancing practical, technology-driven safety solutions, incorporating both technical feasibility and user-centered design principles. Advancements in Phase-Based Ranging: Despite inherent limitations, the novel methods introduced improve the practicality of phase-based ranging, offering a pathway toward more effective tracking technologies.
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