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WPA????????

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wpa cell-id tdoa rssi ... – PowerPoint PPT presentation

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Title: WPA????????


1
??????
  • ???????? ?

2
??
  • WPA????????
  • ??????
  • Cell-ID??
  • TDOA??
  • RSSI??
  • ?? ????
  • ???

3
WPA????????
?????
??
AP
  1. ???????AP????????????????(?????????????????????
    ???????)
  2. ?????????????AP??????????
  3. AP?????????????(RADIUS)?????
  4. ??????AP???????ID/??????????
  5. ???AP??????????ID/??????????
  6. ??????AP??????????
  7. AP??????????(????????IP?????????)

?????
???????
?????
?ID/???????
?ID/???????
?????
?????
4
?????? 1/3
  • ???????????3???????
  • Cell-ID??
  • ???????????AP????????(??)??????????????????
  • ??AP??????????????
  • ???????????
  • ??????PHS

??2
??1
??4
??3
5
?????? 2/3
  • ???????(TDOA Time Difference of Arrival)??
  • ??????????????????AP?????AP?????????????????????AP
    ?????????????????????????????
  • ??AP?????????????????????
  • ???AP???????????????? x??y??z????????????4??A
    P???
  • ???GPS???CDMA????????WiFi??????

P-P2 - P-P1c(T2 - T1) P-Pn -
P-P1c(Tn - T1)
Tn
Pn
T2
P
T1
???????????????TOA????????????????AP??????????????
??????????
P2
P1
6
?????? 3/3
  • ????(RSSI Received Signal Strength Indicator)??
  • ????????????????????????????????????????????
  • RADARAP??????????????????????????
  • WiPS?????LAN??????????
  • (??????Pr(d)P0 20log(4pd /?)) P0??0????
  • Ekahau??????????????????????
  • ?????????????????
  • ??????????????????????????????? ??????(Network
    Stumbler ?)???????????? ?????????????????????????
    ????????????
  • ???PHS?Bluetooth??????

7
?? ????
  • AP????????????????????????????
  • ????????????2??AP???????

P-P1d1P-P2d2P-P3d3
P3
d3
d2
P
d1
P1
P2
???????
8
???? (??ID??)
  • ???????
  • ???????????????AP???????
  • ??????????????????????????????AP?????
  • ????AP?????????????AP??????

AP1
AP2
AP3
AP5
AP4
AP6
AP7
AP8
AP9
????????AP ????????AP
AP1?? AP1
AP1??AP3 AP2
AP3?? AP3
AP1??AP7 AP4
3????AP AP5
AP3??AP9 AP6
AP7?? AP7
AP7??AP9 AP8
AP9?? AP9
  • ??
  • ? AP???????????(AP1,3,7,9?????)
  • ?????AP?????50m??70m??
  • ??????????????
  • ?AP?????????2m

9
?? (??ID??)
  • ??
  • ????????????
  • ?????????????????????????(AP????????)????????
  • AP??????????
  • ??
  • ????????????
  • ?????????????????????

??100m
2m
??99.98m
??70.7m
99.98m
10
???? (TDOA??)
  • ???????
  • ???????????????AP???????
  • ????????????????????????????3??AP?????
  • 3??AP???????????????????????
  • ??????????????????????AP??????

AP1
AP2
AP3
AP5
AP4
AP6
AP7
AP8
AP9
?? ? AP???????????(AP1,3,7,9?????) ?????AP?????50
m?? ?????????????? ?AP?????????2m
11
?? (TDOA??)
  • ??
  • ?????????????????????
  • ????????????????????????
  • RSSI???????????????????????(AP?????????????????)
  • ??
  • ?????????????????????????????
  • ????????????3?(????????4?)?AP?????????????

12
??
  • ?????????????????????????WiPS??????LAN???????????
  • ?? ?????????????????? LAN ??????????????????
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