VLBI?????????????????? ??????????

1
VLBI????????????????????????????

• ?????????????(NiCT)
• ???(JAXA)?????(???)
• ???????VLBI??????
• (JAXA,NICT,NAO,GSI,????????????)

2
?????????????
VLBI

R02
R01
3
Observable of VLBI Phase Delay Group delay
2p n ambiguity
tgGroup Delay
Dtp 1/RF 1 pico second
Phase
Phase Delay
Dtg 1/BW 1 nano second
(Spacecraft)
Band width
0
Frequency
4
??????(Post-fit ????)
5
?????
6
?????????????????(?????)? ??(6?4????)
Tobs Nstn Nbase
6/4 26 h 7 21
???RRR ???????
7
????VLBI????????????????

• ???
• ?????????(????????)
• ????????(???)
• 1ns/6000km10mas(50nrad)
• ????(Challenging)
• ???????
• 10ps/600km1mas(5nrad)
• ???????
• (????)?????

8
????????(??VLBI )
??? ???
????? ??? ?????????????????????

• ???????????
• ??????????????

???
???
????
????
???
??
9
?????

• ???????(???????)???
• (??????????)
• ?????????

10
Nozomi???????????????????????
????????????????????????(24????)?????????? (June
4th Nozomi??)
11
??????????? ?2????(fit)?? ??
????????? ??ps?
12
???????
Long BaselineOK,OH,UH,TK,TH,YH Very Long
Baseline Oc.Tc,Uc,cK,cH,cY
Short Baseline OU,OT,UT,UY Middle BaselineUK,KY
13
???????X????
8.4GHz 1 Cycle
Long BaselineOK,OH,UH,TK,TH,YH Very Long
Baseline Oc.Tc,Uc,cK,cH,cY
Short Baseline OU,OT,UT,UY Middle BaselineUK,KY
14
???

• ??????
• ???????????????????
• ???????????????????????
• ??VLBI(????????)
• ?????????????????????
• ???
• ????
• NOZOMI????????????????1?????????????(?)