Mitigating propagation errors forindoor positioning inwireless sensor networks.

hardware isneeded, suchas inTOA andAOA.RSS measurements arealso afavourable technology asthey Implementing positioning systemsfor indoor canbemadeasabackground taskonanydatatransfer environments isnotoriously difficult. Thevast array of andevenoncommunications notdirectly involving the interacting parameters suchasfurniture, roomshape listening node. Inaddition heterogeneous sensor types andmaterials meanthatthesimulation ofsuchan arenotdetrimental toRSSbasedpositioning systems environment isoflimited value. Wepresent inthis solong asthetransmit powerisknown. Thisprovides a paperresults fromanempirical investigation astothe method forextending network coverage atlowcost. attainable accuracy ofa RadioFrequency (RF) Various localization algorithms exist that exploit RSS, positioning system basedonreceived signal strength[1],[2],[3],[4]. A commonway tosetupa RSS (RSS). Methodstoimproveconfidence, suchas positioning system istoarrange asetoffixed reference frequency averaging andbi-directional ranging, are nodesandrecord their positions. A numberofunexplored. Finally wepresent andevaluate a novel localised nodesthenrange tothereference nodesand methodforcalibrating thechannel propagationsolve their position through apositioning algorithm. exponent withnopriorknowledge ofthesensor Multi-lateration isoneexample ofsuchatechnique. By network layout orroomshape. solving position locally asopposedtocentrally communication overheads arekepttoaminimum. In