Abstract
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.
