A new location technique for the active office

Ward, Andy; Jones, A.E.; Hopper, Andy

doi:10.1109/98.626982

Cited by 1,059 publications

(526 citation statements)

References 16 publications

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“…Network localization is an active research field, e.g., [1], [5], [9]- [11], [16], [19], [22], [23], [27], [32], [39], [40], [42], [44], [45], [47], [49], [50], [52]. The previous approaches can be classified into two types: coarse-grained and fine-grained.…”

Section: Related Workmentioning

confidence: 99%

A Theory of Network Localization

Aspnes

Eren

Goldenberg

et al. 2006

IEEE Trans. on Mobile Comput.

563

396

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In this paper we provide a theoretical foundation for the problem of network localization in which some nodes know their locations and other nodes determine their locations by measuring the distances to their neighbors. We construct grounded graphs to model network localization and apply graph rigidity theory to test the conditions for unique localizability and to construct uniquely localizable networks.We further study the computational complexity of network localization and investigate a subclass of grounded graphs where localization can be computed efficiently. We conclude with a discussion of localization in sensor networks where the sensors are placed randomly.

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Section: Related Workmentioning

confidence: 99%

A Theory of Network Localization

Aspnes

Eren

Goldenberg

et al. 2006

IEEE Trans. on Mobile Comput.

563

396

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“…Franklin & Flaschbart [14] see it as the situation of the user. Ward et al [27] view context as the state of the application's surroundings and Rodden et al [20] define it to be the application's setting. Hull et al [15] included the entire environment by defining context to be aspects of the current situation.…”

Section: Previous Definitions Of Contextmentioning

confidence: 99%

“…Many researchers [25,27,16,3,7,10,1] define context-aware applications to be applications that dynamically change or adapt their behavior based on the context of the application and the user. More specifically, Ryan [21] defines context-aware applications to be applications that monitor input from environmental sensors and allow users to select from a range of physical and logical contexts according to their current interests or activities.…”

Section: Previous Definitions Of Context-awarementioning

confidence: 99%

Towards a Better Understanding of Context and Context-Awareness

Abowd¹,

Dey²,

Brown

et al. 1999

Lecture Notes in Computer Science

1,832

914

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Abstract. The use of context is important in interactive applications. It is particularly important for applications where the user's context is changing rapidly, such as in both handheld and ubiquitous computing. In order to better understand how we can use context and facilitate the building of context-aware applications, we need to more fully understand what constitutes a contextaware application and what context is. Towards this goal, we have surveyed existing work in context-aware computing. In this paper, we provide an overview of the results of this survey and, in particular, definitions and categories of context and context-aware. We conclude with recommendations for how this better understanding of context inform a framework for the development of context-aware applications.

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“…TDoA technique is normally used to measure distance from a transmitter to receivers or vice versa and then, target position is determined by using these distances and applying lateration methods. Active Bat of Andy Ward and his colleagues ( [8] and [9]), Cricket Indoor Localization of Priyantha and his team at MIT ( [36] and [37]) are good completed systems which pioneer this technique. Ultrasound-based positioning systems provide an accuracy up to centimeter range but require a stationary structure and line of sight (LoS) condition, it means user has to ensure that there is no obstacle between transmitter and receiver.…”

Section: Introductionmentioning

confidence: 99%

Improvement of Ultrasound-based System Using Sine Wave Detector and CAN Network

Tan¹

2017

Preprint

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This paper presents an improved indoor localization system based on RF and ultrasonic signal which we named SNSH system. This system composes of a transmitter mounted in a mobile target, and a series of receiver nodes which are managed by a coordinator. By measuring Time Delay of Arrival (TDoA) of RF and ultrasonic signal from the transmitter, distance from target to receiver node is calculated and sent to the coordinator through CAN network, and all the information are gathered in PC to estimate 3D position of the target. Sine wave detector and dynamic threshold filter are applied to provide excellent accuracy of range measurement from TDoA result, and multilateration algorithms is realized to optimize coordinate determination accuracy. Specifically, Linear Least Square and Non-linear Least Square techniques are implemented to contrast their performances in target coordinate estimation. RF signal encoding/decoding time, time delay in CAN network and math calculating are carefully considered to ensure optimal system performance and get ready for field application. Experiments show that sine wave detector algorithm has greatly improved range measurement accuracy, with mean error at 2.2mm and maximum error at 6.7 mm, for distance below 5m. In addition, 3D position accuracy is greatly enhanced by multilateration methods, with mean error in position stay under 15mm, and 90% confident error values at 23mm for LLS, 20mm for NLS. Overall system update period has been verified in real system operation, with maximum rate at 25ms, and compared with other existing researches.

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A new location technique for the active office

Cited by 1,059 publications

References 16 publications

A Theory of Network Localization

A Theory of Network Localization

Towards a Better Understanding of Context and Context-Awareness

Improvement of Ultrasound-based System Using Sine Wave Detector and CAN Network

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