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Although outdoor navigation systems are mostly dependent on GPS, indoorsystems have to rely upon different techniques for localizing the user, due tounavailability of GPS signals in indoor environments. Over the past decadevarious indoor navigation systems have been developed. In this paper anoverview of some existing indoor navigation systems for visually impairedpeople are presented and they are compared from different perspectives. Theevaluated techniques are ultrasonic systems, RFID-based solutions, computervision aided navigation systems, ans smartphone-based applications.

Enhanced navigation systems in GPS denied environments for visually impaired people: A Survey