Special Issue on Global Positioning System

Enge, Per; Misra, P.

doi:10.1109/jproc.1999.736338

Cited by 364 publications

(185 citation statements)

References 2 publications

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“…We set the training vector t as follows: t 1 , t 2 and t 3 indicate the floor number that is expressed by the 1-of-K coding scheme; for example, in the case that the measurement point is the second floor, {t 1 , t 2 , t 3 } = {0, 1, 0}. t 4 indicates the displacement of the moving carriage d M , and we set t 4 …”

Section: Experimental Settingmentioning

confidence: 99%

“…We focus on the wireless LAN for localization in indoor environments since no special device is required for locating mobile personal devices. Currently, the global positioning system (GPS) is used for the outdoor localization of a mobile client carried by humans or mobile robots [4]; however, it is difficult to estimate the global position of the mobile client in multistory buildings since the GPS is not suitable for indoor localization. In indoor localization systems, radio frequency identification (RFID) tags are used [5,6]; these systems require the persons or robots to have an RFID reader.…”

Section: Introductionmentioning

confidence: 99%

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Localization of Mobile Client in Multistory Building using Public Wireless LAN System

Umetani

Yamashita

Tamura

2011

Stochastic Systems Theory and its Applications (SSS)

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This paper describes a method for the localization of wireless mobile clients in multistory buildings using a public wireless LAN system. The global positioning system (GPS) is used for the outdoor localization of a mobile client carried by humans or mobile robots; however, it is difficult to estimate the global position of the mobile client in multistory buildings since the GPS is not suitable for indoor localization. The proposed method uses public wireless LAN access points which are settled three-dimensionally in a building. The application of the method involves the assumption that the humans or robots carrying the mobile client move horizontally on each floor in the building. The method simultaneously estimates the position of the mobile client and its floor number. Experimental results indicate that the proposed method is feasible.

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Section: Experimental Settingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Localization of Mobile Client in Multistory Building using Public Wireless LAN System

Umetani

Yamashita

Tamura

2011

Stochastic Systems Theory and its Applications (SSS)

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“…TOA measurement is being employed both outdoors for GPS-positioning [7] and indoors to find things and people marked by a tag [8]. In the latter paper, the author gives an appraisal of the achievable accuracy when measuring the round trip TOA within the 2.44 GHz and 5.78 GHz bands.…”

Section: Related Workmentioning

confidence: 99%

“…If two clocks interfere, their phases are equal every beat period, which is the reciprocal of the beat frequency. The beat frequency is the difference of both frequencies of both interfering waves (7).Thus, the impact of quantization errors causes a similar effect as the two interfering waves -namely a beat frequency.…”

Section: Approachmentioning

confidence: 99%

Measuring Round Trip Times to Determine the Distance Between WLAN Nodes

Gunther

Hoene

2005

NETWORKING 2005. Networking Technologies, Services, and Protocols; Performance of Computer and Communication Networks; Mobile A

133

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Abstract. This publication explores the degree of accuracy to which the propagation delay of WLAN packets can be measured using today's commercial, inexpensive equipment. The aim is to determine the distance between two wireless nodes for location sensing applications. We conducted experiments in which we measured the time difference between sending a data packet and receiving the corresponding immediate acknowledgement. We found the propagation delays correlate closely with distance, having only a measurement error of a few meters. Furthermore, they are more precise than received signal strength indications.To overcome the low time resolution of the given hardware timers, various statistical methods are applied, developed and analyzed. For example, we take advantage of drifting clocks to determine propagation delays that are forty times smaller than the clocks' quantization resolution. Our approach also determines the frequency offset between remote and local crystal clocks.

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“…Recent advances in positioning techniques such as GPS [7,8] and other ad hoc localization [9][10][11][12] has motivated researchers to pursue better routing schemes that take into account the physical location of the node (location is usually represented as a tuple consisting of latitude, longitude and altitude or as a point in space using cartesian coordinates). Many schemes have been proposed for position based routing in static ad hoc networks that guarantee loop free routes from a source to a destination [13][14][15].…”

Section: Introductionmentioning

confidence: 99%