??????????????,???????? - PowerPoint PPT Presentation

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??????????????,????????

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Title: Author: Yenchih Last modified by: phinie Created Date: 10/14/2003 2:07:22 PM Document presentation format: – PowerPoint PPT presentation

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Title: ??????????????,????????


1
????????
  • ????????
  • ????

2
?4? ?????
  • 4-1 ?????????????
  • 4-2 ????????
  • 4-3 ???
  • 4-4 ????????????

3
4.4 ???? ??
  • ??????
  • ??????????
  • ??????

4
??????
  • ??????????????????
  • ??????????????,??????????
  • ?????????????????? ???
  • ??????????????

5
?? RADAR
  • ????????????????
  • RADAR ? RAdio Detection And Ranging
    ???,??????,?????????
  • Radio???????????,???? 1 300??,???? 1300 GHz
    ?????
  • ???????? 10-6 ? 107 ?(??)
  • ?????????????

6
?? RADAR
  • Detection ??????????????????,????????
  • Ranging ???????????????,????????????? R
    c?t/2?
  • ??,????,??????????

7
?????????
????????????,?????
????????? ???0.0002???? R c?t/2 ????????
?,???!
31080.0002/2?? ??? ??,30???!
??????
?????
8
????
  • ?? pulse wave
  • ??????
  • ??????

9
?? pulse wave
  • ??????
  • ???(??)??,???1??,?5?????
  • ?5????????????????
  • ?????????,????????
  • ?????????????????
  • ????????????????????
  • ???????????????

10
??????
  • PRT (?????) ?????????????
  • PRF (?????) ???????,????????????,PRF 1/PRT
  • PW (? ? ? ?) ????,???????
  • RT (? ? ? ?) ????,???????
  • RF (? ? ? ?) ??????

11
??????
  • ????(PW)???
  • ????? RRES c PW/2
  • ????? RMIN c PW/2
  • ?????(PRT)??
  • ??????, RUNAMB c PRT/2 c/(2PRF).
  • ??Rotation Rate ???

12
????? Maximum Range???? Unambiguous Range
13
?????????
  • ??????????
  • PW 10??(?10-3 ?10-6 ?10-9 )
  • RT 1??
  • ??
  • ???PRF???
  • ?????????
  • ??????????????

14
? ? ? ? ? ? ? ?
???
???
?????
?? ???
??
???
???
15
??????????
  • ??
  • ???????

16
??
  • ?????
  • ?? ? ?? ???
  • ?????
  • ??????????(dipole)??,???
  • ??????????????????
  • ?????,?????,1/4l

17
?????
  • ??(Lobe)???????????
  • ??????,?????
  • ???????(??????)
  • ??????
  • ?????????,???????
  • ?????????????
  • ??????????,?????????????

18
????? ????????????
??? Main Lobe
??q
??F
??? Side Lobe
min overall coverage beam number 360 / q
19
?????????
?x
??????
?
20
?????????(??????,PAR)
D
21
??? Transmitter
  • ??
  • ??????????????
  • ???????????????,?????????????
  • ????
  • ??? (magnetron)??????????(oscillator)
  • ??? (amplifiers)????

22
??? Receiver
  • ??
  • ?? (Sense) ??
  • ??????,????????
  • ????
  • ??????????????????
  • ?????????/???? signal-to-noise ratio S/N
  • Miss and FAR

23
??? Power Supply
  • ????????????????
  • ??? (transmitter) ???????????????
  • ?????????????
  • ????????,?????? (peak power)? ???????????????????

24
?????????
  • ??? (Synchronizer)
  • ????????????????????
  • ????? (Duplexer)
  • ???????????????????

????? ???????????????????
????? ???????????????????
25
4.4 ???? ??
  • ?????
  • ??????
  • ????
  • ????
  • ???????

26
(No Transcript)
27
?????
  • ???,??????????
  • ?????????
  • ???Leonardo da Vinci(1452-1519)???1490????????,??
    ??????????,??????????
  • ??????????
  • ??????????
  • ???,????????????,??????

28
?? Sonar ????
  • ????,??? SONAR ????
  • SONAR? SOund Navigation And Ranging ???,?????????
  • ?????????,????????????????????????,???????????????
    ?

29
?? Sonar ????
  • ?????????,?????(????? ????)?????
  • ?????????????????
  • ??/??
  • ????????????
  • ???????????????????,??????,??????
  • ??????????10?

30
???????
  • ?????????????????,?????????
  • ?????????
  • ??????,???????
  • ???????????
  • ?????????
  • ???????????,??????????
  • ????????????????????

31
?????????
???????
?????
?????
?????
??
????
????
32
????????Broadband Bearing Time History
????
??
? ?
??? ???
33
?????????
????
??
??????????
??????????
????
34
?????????
???????
?????
???
???
?????
??
????
???
???
?????
35
???? Beamforming
  • ????? Transducer Array
  • ????? Beamforming Processor

36
???
A-scan
PPI
37
????
  • ???????
  • ????
  • ????
  • ????
  • ???????
  • ??
  • ???
  • ??
  • ??????????????????

38
???????
  • ????????????????
  • ???????(T)???(p)???(S)??????,???? f? c(T,p,S)
    ?????
  • T?? Temperature,??? 10 C ? ?? 3 m/s
  • p?? Pressure,??100?? ? ?? 1.7 m/s
  • S?? Salinity,??? 1 ppt (part per thousand) ? ??
    1.3 m/s
  • ??
  • ???????

39
  • ?????,?????????,?????????????,????????????

?????
?????????????
???
????
???
40
??????????????
???
??????
???
??????
??????
41
??????????
???
????
42
4.4 ???? ??
  • ??
  • ???
  • ???

43
????? Electromagnetic Spectrum
44
???
  • ??
  • ??????????
  • 1 ???770??
  • ??????
  • ????????
  • ????????
  • ?????
  • ??????
  • ??????

45
??? LASER
46
??? LASER
?? http//www.hk-phy.org/articles/laser/laser.html
  • ??????,???????????
  • Light Amplification by Stimulated Emission of
    Radiation ???
  • ????????

47
??? LASER
  • ??
  • ??????? (coherence)
  • ???????
  • ??????
  • ???-??????????
  • ??????
  • ????????
  • ??????

48
??? LASER
  • ??????????????
  • ??????
  • ??????,????
  • ??????,?????????
  • ??????,????

49
????
  • ??????????????,???????? (Class)

?? ?? ?? ??? ??
??? Class 1 ? ? ?
??? Class 2 ? ????? ??
??? Class 3 ? ?????? ?
??? Class 4 ? ??????????(????)?????? ?
50
???? ????? Electromagnetic Spectrum
51
  • abcdefghijklmnopqrstuvwxyz abcdefghijklmnopqrstuvw
    xyz
  • ABCDEFGHIJKLMNOPQRSTUVWXYZ ABCDEFGHIJKLMNOPQRSTUVW
    XYZ
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