Abstract
Growth in the applications of wireless devices and the need for seamless solutions to location-based services has motivated extensive research efforts to address wireless indoor localization networks. Existing works provide range-based localization using ultra-wideband technology, focusing on reducing the inaccuracy in range estimation due to clock offsets between different devices. This is generally achieved via signal message exchange between devices, which can lead to network congestion when the number of users is large. To address the problem of range estimation with limited signal messages, this paper proposes multiple simultaneous ranging methods based on a property of time difference of reception of two packets transmitted from different sources in impulse-radio ultra-wideband (IR-UWB) networks. The proposed method maintains similar robustness to the clock offsets while significantly reducing the air time occupancy when compared with the best existing ranging methods. Experimental evaluation of ranging in a line-of-sight environment shows that the proposed method enables accurate ranging with minimal air time occupancy.
Highlights
With an advancement in ubiquitous access to wireless technology and the large-scale proliferation of wireless devices with communication capabilities, the need for real-time localization of portable devices has enabled a wide range of context-aware applications and services in several industries, health sector, surveillance, disaster management, academia, and so on [1,2,3]
We address the problem of range estimation in impulse-radio ultra-wideband (IR-UWB) Real-time location systems (RTLSs), where the air time occupancy is minimized and the clock offset problem is properly handled
Note that AltDS-two-way ranging (TWR)&PR may be executed by the same steps of wireless transmission as MSR2, since they are different only about the equation of computing the time of flight (TOF)
Summary
With an advancement in ubiquitous access to wireless technology and the large-scale proliferation of wireless devices with communication capabilities, the need for real-time localization of portable devices has enabled a wide range of context-aware applications and services in several industries, health sector, surveillance, disaster management, academia, and so on [1,2,3]. Real-time location systems (RTLSs) for user-centric location-based services are gaining significant attention as both service providers and end users can benefit from them They may be used to monitor and navigate inventories in a warehouse, or provide context-aware services within proximity such as to assist patients with health-care facilities in hospitals or customers in shopping malls. Indoor RTLS applications must inherit stringent requirements such as high localization accuracy, robustness to noise, interference, and wireless multi-path effects, and so on [1,2,3] In this regard, the very short time-domain pulses of IR-UWB systems make them outstanding techniques commonly used by researchers and industry in various fields [3]
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