Performance Analysis On UWB Wirless Positioning Algorithm

UWB (Ultra-Wideband) is one of the hottest technologies in the communicationarea. It does not need signal carrier but pulse with time interval less than ananosecond to run communication. It has wide frequency spectrum, calledzero-signal-carrier communication or wireless pulse communication. The technologyapplies to short-distance communication and has high transmission speed, largesystem capacity, low power loss. The communication is difficult to be intercepted,with high process gain and multi-pass resolving power. Therefore, UWB is a goodoption in indoor positioning..Wireless positioning is a kind of technology to locate mobile stations bycalculating the signal parameters between mobile stations and base stations with somepositioning algorithm within the internet receiver or mobile receivers. There are twokey steps in wireless positioning. The first step is the estimation of positioningparameters. By this way, the signal’s TOA and AOA from receivers can be obtained.The second step is the realization of positioning algorithm. The mobile stations can belocated by putting measuring parameter into the positioning algorithm. Given that theincreasing demands on various industries, strongly pushing the research into mobilestation positioning, this technology has became one of the hottest topic recently.Thus, the wireless positioning technology based on UWB is highly practical andresearch-worthy. This paper systematically examines the technology on the basis ofnew findings on UWB and wireless positioning. Two schemes of improvement areproposed.Firstly, the traditional positioning technology and the two dimensional model ofposition algorithm should be changed into three dimensional model. It is due to thefact that the traditional positioning technology is used for the positioning in the openair, especially in the military area, such as radar navigation and tracking. Today thetechnology is mainly used for non-military purpose. The demand for short-distancepositioning in the room is increasing, such as logistics and transportation industry. Therefore, The model and positioning algorithm in the paper are all produced andcalculated in three dimensional space, within which there is detailed calculation forTOA, TDOA and AOA together with Chan Algorithm and Taylor Algorithm.. In thefollowing simulation experiment, the accuracy of three-dimensional-modeledpositioning and algorithm is not undermined.Secondly, the study tries to improve Chan Algorithm and TDOA/AOAcombination positioning and find out a combined positioning algorithm applied tothree dimensional space based on Chan with few increased calculation complexity. Inthe environment of LOS, the technology is simulated in the information channel ofAWGN and UWB provided by IEEE802.15.4a standard. It is found that thepositioning based on combined algorithm works better than that based on simply onChan algorithm in any information channel.In addition, the paper conducts simulation for the new algorithm in NLOSenvironment. However, the positioning performance seriously decreased, given thatthe NLOS signal wasn’t optimized during the estimation of positioning parameters. Itled to the long delay for receiver to collect TOA. Therefore, the wireless positioningtechnology covers many things. We can not only optimize the methods of positioningand algorithm, but also the methods of parameter estimation. Then we can resolve theNLOS’ influence on positioning and increase the accuracy of positioning. More workshould be done on this area.