Multi-precision Indoor Location System Based on Ultrasonic and ZigBee
Propose a multi-precision indoor location system which is constituted by a new receiver network. The system integrates advantages of ZigBee and Ultrasonic location system, using TOA and RSSI algorithm to complete the location. There are multi-precision, l
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Abstract. Propose a multi-precision indoor location system which is constituted by a new receiver network. The system integrates advantages of ZigBee and Ultrasonic location system, using TOA and RSSI algorithm to complete the location. There are multi-precision, low-cost, low-power, flexible installation and maintenance features. Experimental results show that the location precision of the location system can be changed by arranging the receiver network flexible. Keywords: ZigBee, Ultrasonic, Indoor Location, multi-precision.
1 Introduction With the development of location technology, there have been a variety of indoor location technologies, such as RF (Radio Frequency) location, infrared location, ultrasonic location and optical location. RF location subdivided into WLAN (Wireless Local Area Network) location, RFID (Radio Frequency Identification) location, Bluetooth location, UWB (Ultra Wide Band) location and ZigBee location. Because of the location technologies have its own shortcomings which cannot overcome, it is difficult to use in a large area independently. As shown in table 1. In addition to the features described in Table 1, the range of precision of location technology is limited, so different location technologies suit for different circumstances. If only using the high-precision location technology, it will be wasteful for the location equipment in low-precision location area and then increase the total cost. If only using the low-precision location technology, it cannot satisfy the requirements of the location precision in high-precision location area. To develop a multi-precision location system will solve the problems. The system can satisfy the requirement of location precision by flexibly changing the layout which depended on the features of environment and the requirement of location precision. This paper proposes a multi-precision indoor location system which is constituted by multi-precision location receiver group. This system integrates the advantages of ZigBee and Ultrasonic location system and TOA and RSSI algorithm to achieve the multi-precision, low-cost, low-power, flexible installation and maintenance indoor location function. H. Tan (Ed.): Knowledge Discovery and Data Mining, AISC 135, pp. 193–199. springerlink.com © Springer-Verlag Berlin Heidelberg 2012
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L. Zhang, Y. Tian, and X. Yu Table 1. Technical Features of the Location
Technology RF
Infrared
Ultrasonic Optical UWB
Feature Wide scope, NLOS relation constraint; Cheap; Cheap, Low power; Low location precision; Susceptible to the sun interference; NLOS relation constraint; High location precision; Sending and receiving angle constraint; Inconvenience to cable installation inconvenience; Uncertain location precision; Expensive; NLOS relation constraint; Expensive; High location precision; NLOS relation constraint;
Example RADAR System[1]
Active Badge[2]
Active Bat[3] Cricket System[4] EasyLiving[5] Trip System[6] Ubisense[7]
2 System Structure and Hardware This system includes many MTs (mobile terminals), control
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