WiZiLoc: ZigBee Node Self-Positioning Thechnology Based On Cross-Technology Communicatin

Zig Bee wireless sensor positioning system is widely used in the positioning of portable wearable devices.Due to the limitation of the distance of signal transmission,the wearable devices,positioning relies on a large number of Anchor Nodes(AN).A lot of work needs to deploy AN early on and maintain AN later on.Wi-Fi positioning system does not need to deploy Anchor Nodes,but the high power consumption of Wi-Fi AP makes it unsuitable as a portable wearable device.Cross-technology Communication(CTC)makes it possible to locate Zig Bee nodes using Wi-Fi AP.At the begin,this paper designs a Uznknown Zig Bee Node self-positioning system--Wi Zi Loc,which does not need to arrange AN in advance.Wi Zi Loc is the first location system to use an existing Wi-Fi AP to locate UZN,without modifying hardware,with wide coverage,no dead corner,and anti-interference features.Secondly,in view of the asymmetry of signal coverage between Wi-Fi AP and Zig Bee nodes,this paper proposes an algorithm for progressively estimating UZN coordinates by using the Sink Node coordinator--ONION algorithm.According to the coordinates of the one-hop node that can communicate directly with Sink Node,the position of the multi-hop node that can communicate with SN through forwarding can be calculated.This hierarchical structure of estimation feels like an onion,with layers of positioning from the inside out.Then,in order to avoid CTC signals interfering with normal Zig Bee network communication,this paper designs a CTC signal broadcast cycle management method.That is to ensure that each UZN can receive CTC signal,but also for Zig Bee network communication reserved enough time.In addition,RSSI linear logarithmic attenuation model is used to improve the positioning accuracy of the system.Finally,the prototype system of Wi Zi Loc is implemented on Software-Define Radio platform USRP N210 and commercial Zig Bee device CC2530.Perform performance tests in different environments.The experimental results show that the positioning accuracy of system can reach decimeter level,and it has strong anti-jamming ability.In addition,this paper also uses software to simulate system to test its performance when 100 nodes are densely deployed on a site of 10,000 square meters.The experimental results show that Wi Zi Loc can complete the positioning work with wide coverage and no dead corner..