A Review of Friis Equation Based Indoor Positioning

Transcription

1 dvancd Scnc and chnolog Ltts Vol.30 ICC 03 pp Rvw of Fs Equaton asd Indoo Postonng Changong Han Jagol m Goung L Dpt. of Comput Engnng Dongguk Unvst at Gongju Gongju Gongbuk Koa {chan m lk}@dongguk.ac.k bstact. Wlss Local a twok WL basd Indoo postonng dos not qu an spcal qupmnts ddcatd fo postonng onl and t s conomcal. WL basd ndoo postonng tchnqus can b classfd nto fngpntng mthods o fs quaton basd mthods. Fngpntng mthods a ptt accuat but collctng fngpnts taks a long tm. Fs quaton basd mthods qu act coodnats of accss ponts P and as to mplmnt. hfo ths pap vws fs quaton basd ndoo postonng tchnqus. Kwods: Indoo Postonng; lataton; WL; ccss Pont; RSSI. Intoducton Locaton basd svcs LS a nfomaton svcs accssbl wth mobl dvcs though th mobl ntwok and utlzng th ablt to mak us of th locaton of th mobl dvc []. LS svcs nclud dntfng a locaton of a pson o objct pacl tackng vhcl tackng mobl commc wath svc gam taffc advsos and so on. Snc ths LS svcs a so hlpful to popl's dal lf so man scntsts and ngns a dvlopng nw tchnologs and applcatons of LS v da. Snc LS cannot b alzd unlss th locaton of th mobl dvc s dntfd postonng s on of th ssntal tchnqus n LS dvlopmnt. Fo outdoo LS Global Postonng Sstm GPS povds gnal soluton fo postonng. Howv GPS sgnal s so wak ndoo o undgound that w cannot dtmn us's locaton wth GPS alon. Consquntl tchnqus fo ndoo postonng hav bn studd b man sachs. ctv adg ctv at and Cckt a pons of ndoo postonng. hs sstms a hghl accuat. ut th qu spcal qupmnts ddcatd fo postonng []. Man ndoo postonng sstms whch do not qu spcal qupmnts hav also bn dvlopd. Most of thm utlz WL Wlss Local a twok qupmnts. owadas WL s bng svcd vwh ncludng collg campuss apots hotls and vn homs []. h a man altnatv tchnqus w can choos n mplmntng WL basd ndoo postonng. mong thm th tlataton s on of th most conomc and asst on to b nstalld. h tlataton stmats th dstanc btwn an accss pont P and a mobl dvc wth th ado fqunc RF popagaton loss modl whch s a smpl ISS: SL Copght 03 SERSC

2 dvancd Scnc and chnolog Ltts Vol.30 ICC 03 mathmatcal psson psntng th latonshp btwn th cvd sgnal stngth RSS and th dstanc btwn th snd and th cv. hn t stmats th locaton of th mobl dvc wth th stmatd dstancs and th coodnats of th Ps. hat s n od fo th tlataton to b appld th coodnats of th Ps must b avalabl. hfo on of th man puposs of ths pap s to popos a posto of floo maps and coodnats of ponts of ntst POI ncludng Ps so that an softwa dvlop can us thm aft gttng authozaton. RSS s nfluncd b so man nvonmntal paamts and stablshng an appopat RF popagaton loss modl s v dffcult. s th sult on of th dawbacks of th tlataton s that t s lss accuat than oth mthods and t somtms tuns an nodnatl wong answ. hfo w nvstgat th pos and cons of vaous modfd vsons of tlataton and popos ou own soluton fo ndoo postonng. lataton If w masu angs fom bas statons n n to a mobl tmnal m z as shown n Fgu thn w can stmat th coodnats of m b usng tlataton. squang w can obtan th followng psson fo : Fg.. dagam to llustat tlataton. z fo subtactng fom w hav b wh z 0 Copght 03 SERSC

3 Whn th coodnats a 3 dmnsonal w nd to hav at last 4 bas statons. pplng th MMSE Mnmum Man Squa Eo mthod w can stmat th locaton of m ˆ wth th followng poston stmats [3]: b ˆ 3 Kalman flt h autho of [4] poposd a nw algothm whch s v smla to th Kalman flt pocss. It s dscbd as follows: wh and wh s P 's coodnats and s th cunt locaton of th mobl dvc. W can ntalz wth an valu. Wth w updat th mobl us's poston as follows: F b d d F dvancd Scnc and chnolog Ltts Vol.30 ICC 03 Copght 03 SERSC 03

4 dvancd Scnc and chnolog Ltts Vol.30 ICC 03 4 Wghtd Cntod Localzaton In [5] Wghtd Cntod Localzaton WCL s dscbd. WCL blongs to th catgo of coas gand appoachs. Consdng Fgu WCL stmats th coodnats of m as follows: ˆ ˆ 5 Concluson h fs quaton basd ndoo postonng n WL nvonmnt s on of th most conomc and asst to mplmnt ndoo postonng mthods. hfo w vwd stng fs quaton basd ndoo postonng tchnqus. h tlataton suffs fom th nos snstvnss of RF sgnal and latvl naccuat. Somtms th coodnats tund b th tlataton a nodnatl wong. ft dscussng th pos and cons of vaous vsons of tlataton w can popos ou own ndoo postonng pocss basd on thm. Wth th nw ndoo postonng mthod w a plannng to buld up a pactcal ndoo locaton basd svc n th na futu. cknowldgmnts. hs sach was suppotd b asc Scnc Rsach Pogam though th atonal Rsach Foundaton of KoaRF fundd b th Mnst of Educaton RF and b Dvlopmnt of Global Cultu and ousm IPV oadcastng Staton Pojct though th Industal Infastuctu Pogam fo Fundamntal chnologs fundd b th Mnst of Knowldg Econom Rfncs. Khaullah Md. Rahman H. anna H.: lud: Locaton basd Svc usng lutooth. Intnatonal Jounal of Comput pplcatons pp m J. and Jong S.: Impovmnt of Kalman Flts fo WL asd Indoo ackng. Ept Sstms Wth pplcatons 37 pp m J. Pak C. Joo J. Jong S.: Etndd Kalman Flt fo Wlss L asd Indoo Postonng. Dcson Suppot Sstms 45 pp Vma.: Dtmnng th lgothm fo Locaton asd Svcs Usng Indoo Postonng chnqus. Intnatonal Jounal of dvancd Rsach n Comput Scnc and Softwa Engnng 7 pp Copght 03 SERSC

5 dvancd Scnc and chnolog Ltts Vol.30 ICC Lwandowsk. Mchals S. Wtfld C. Klau J. Kubsch M.: In-cabn localzaton soluton fo optmzng manufactung and mantnanc pocsss fo cvl acafts. In: Poston Locaton and avgaton Smposum PLS 0 IEEE/IO pp Copght 03 SERSC 05