Indoor-localization system for smart phones

Höflinger, Fabian; Bordoy, Joan; Simon, Nikolas; Wendeberg, Johannes; Reindl, L.; Schindelhauer, Christian

doi:10.1109/iwmn.2015.7322974

Cited by 7 publications

(2 citation statements)

References 17 publications

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“…The third example case is an indoor ultrasound localization system (Bordoy et al 2020) (Ens et al 2015) (Hoeflinger et al 2015), which offers high localization accuracy when compared to alternative technologies, e.g., Wi-Fi-based fingerprinting approaches (Tiku et al 2020), Bluetooth, ZigBee, Ultra Wide Band (UWB), vision and acoustic-based (Zafari et al 2019). It localizes ultrasound transmitters on objects (e.g., goods, transport systems, robots) using receivers on the ceiling by application of time difference of arrival algorithms (TDOA) for the case of known receiver positions.…”

Section: Data Sources and Selection Criteria For Application Casesmentioning

confidence: 99%

A performance-based tabular approach for joint systematic improvement of risk control and resilience applied to telecommunication grid, gas network, and ultrasound localization system

et al. 2021

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Organizational and technical approaches have proven successful in increasing the performance and preventing risks at socio-technical systems at all scales. Nevertheless, damaging events are often unavoidable due to a wide and dynamic threat landscape and enabled by the increasing complexity of modern systems. For overall performance and risk control at the system level, resilience can be a versatile option, in particular for reducing resources needed for system development, maintenance, reuse, or disposal. This paper presents a framework for a resilience assessment and management process that builds on existing risk management practice before, during, and after potential and real events. It leverages tabular and matrix correlation methods similar as standardized in the field of risk analysis to fulfill the step-wise resilience assessment and management for critical functions of complex systems. We present data needs for the method implementation and output generation, in particular regarding the assessment of threats and the effects of counter measures. Also included is a discussion of how the results contribute to the advancement of functional risk control and resilience enhancement at system level as well as related practical implications for its efficient implementation. The approach is applied in the domains telecommunication, gas networks, and indoor localization systems. Results and implications are further discussed.

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Section: Data Sources and Selection Criteria For Application Casesmentioning

confidence: 99%

A performance-based tabular approach for joint systematic improvement of risk control and resilience applied to telecommunication grid, gas network, and ultrasound localization system

et al. 2021

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“…In audio-based indoor positioning systems, code-division multiple access (CDMA) [12,13,14] and linear chirp are the two common audio coding methods [9,10,11,15,16]. Fernando J. Álvarez et al realized an audio-based indoor positioning system that utilized CDMA signals [12].…”

Section: Introductionmentioning

confidence: 99%

Acoustic Indoor Localization System Integrating TDMA+FDMA Transmission Scheme and Positioning Correction Technique

Chen

Cao

et al. 2019

Sensors

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This paper presents a novel audio indoor localization system. In the proposed system, four speakers placed at known positions transmit chirp signals according to the time-division multiple access (TDMA) plus frequency-division multiple access (FDMA) transmission scheme. A smartphone receives the signal via a built-in microphone and calculates the time differences of arrival (TDOAs). Using TDOA measurements, the position is estimated by the shrinking-circle method. In particular, to reduce the positioning error in moving conditions, a TDOA correction method based on Doppler shifts is proposed. The performance of the proposed system was evaluated in real-world experiments using a 10.971 m × 5.684 m positioning area. The results of the static-target positioning experiment showed that the TDMA+FDMA transmission scheme has more advantages in improving the update rate of the positioning system than the TDMA-only transmission scheme. The results of the moving-target positioning experiment under three different speeds demonstrated that the positioning errors were reduced by about 10 cm when the Doppler-shift-based TDOA correction method was adopted. This research provides a possible framework for the realization of a TDOA-chirp-based acoustic indoor positioning system with high positioning accuracy and update rate.

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