NP Release Flag Conflict

Toshimichi Otsubo

Kashima Space Research CenterNational Institute of Information and Communications Technology

ILRS Fall 2005 Workshop, 4 Oct 2005

Everyone makes mistakes, so...

ILRS Normal Point: Data Record, Column 48A flag to indicate the data release

0: first release of data1: first replacement release of the data,2: second replacement release, etc.

It helps to keep the data set consistent at all ACs/AACs.

999997603901052508834100153200013583700000500907411200920001261382714349048949913575000009009422289207300160000078262054722460048297702910000009509422289207300400000055263139735422047369036380000009309422289107300190000065275684381884049423608823000008909424290407000270000080276827395595050684305837000009609424290407000360000082

Recent conflict passes [1]

YY DAY HR SITE WLEN SAT

05 181 14 7810 4230 980070105 183 22 8834 5320 920520105 185 23 7941 5320 760390105 186 22 8834 5320 760390105 187 04 7501 5320 750100105 187 14 7110 5320 650320105 188 05 7110 5320 020090105 190 12 8834 5320 920700205 192 17 7810 4230 920520105 192 17 7810 8460 920520105 193 09 7810 4230 650320105 194 03 7832 5320 860610105 196 19 7810 4230 920520105 196 19 7810 8460 920520105 196 23 7810 4230 010550105 196 23 7810 8460 0105501

05 197 01 8834 5320 010550105 197 01 8834 5320 920520105 197 03 8834 5320 860610105 197 03 8834 5320 890390305 197 04 8834 5320 650320105 197 04 8834 5320 930610205 197 05 8834 5320 860610105 197 06 8834 5320 650320105 198 18 7810 4230 010550105 205 00 1873 5320 650320105 207 17 7355 5321 760390105 218 18 7832 5320 030420605 219 03 7832 5320 980070105 219 17 1864 5320 650320105 220 21 7839 5320 030020105 223 04 7810 4230 000630205 223 04 7810 8460 0006302

Recent conflict passes [2]

05 228 00 7110 5320 650320105 228 00 7110 5320 930610205 228 20 7810 4230 860610105 228 20 7810 8460 860610105 230 05 7110 5320 750100105 230 05 7110 5320 860610105 230 05 7110 5320 950210105 230 07 7810 4230 890010305 230 07 7810 8460 890010305 230 09 7810 4230 020090105 230 13 8834 5320 920700205 234 01 7832 5320 930610205 234 17 1893 5320 650320105 234 19 1893 5320 750100105 239 00 8834 5320 020600105 240 05 7832 5320 920520105 240 22 8834 5320 7603901

05 241 01 7810 8460 000630205 241 02 7810 4230 000630205 241 04 8834 5320 920700205 241 21 8834 5320 760390105 242 03 8834 5320 010530205 242 06 8834 5320 920700205 242 10 8834 5320 920700205 242 20 8834 5320 760390105 243 01 8834 5320 010530205 243 04 8834 5320 920700205 243 06 8834 5320 760390105 243 08 8834 5320 920700205 244 06 7810 4230 920520105 244 06 7810 8460 920520105 244 07 8834 5320 920700205 244 10 8834 5320 920700205 244 20 7941 5320 7603901

Recent conflict passes [3]

05 245 00 7810 4230 760390105 245 04 8834 5320 920700205 247 04 8834 5320 760390105 248 11 8834 5320 920700205 248 18 8834 5320 760390105 249 05 7832 5320 760390105 249 17 8834 5320 760390105 250 07 8834 5320 760390105 250 07 8834 5320 920700205 251 05 8834 5320 760390105 251 13 7839 5320 920520105 252 11 7841 5320 920520105 255 17 7110 5320 650320105 257 02 7080 5320 890390305 259 02 7810 8460 0105501

05 263 22 7832 5320 020600105 264 23 8834 5320 920700205 265 03 8834 5320 920700205 265 23 8834 5320 760390105 266 00 8834 5320 010530205 266 01 8834 5320 920700205 266 05 8834 5320 920700205 266 06 8834 5320 760390105 267 06 8834 5320 040530205 269 07 8834 5320 9207002

Wettzell case: acceptable for all ACs?

(Block A)

(Block B)

Shouldn’t be 1 NP block = 1 pass?We have modified the data collecting software to adapt this at NICT,

but not sure for other analysis centres.

Flag = “0”

Flag = “0”

passNP bin

Legal or otherwise, this is confusing e.g. with:

Flag = “0”

Flag should be “1”, but sometimes “0”

Various SLR Outliers Detected in Daily Multi-Satellite

Analysis

Toshimichi Otsubo

Kashima Space Research CenterNational Institute of Information and Communications Technology

ILRS Fall 2005 Workshop, 4 Oct 2005

Upgraded QC analysis at NICT

• More frequent!– Daily analysis (used to be weekly) – Daily webpage updates, email AIUB; weekly SLReport.

• More satellites!– 16 Sats at maximum. Typ. 11 to 14.

• More accurate!– ‘concerto v4’ – IERS Conventions 2003 compatible

Various SLR Outliers Seen in Post-fit Residuals

(Type a) Spikes

(Type b) Constant RB or TB

(Type c) Wrong Satellites, Wrong Year/Day or LeapSec

(Type d) Unexplainable

(a) Spikes - Pattern 1 : Tail

(a) Spikes - Pattern 1 : Tail

(a) Spikes - Pattern 1 : Tail

(a) Spikes - Pattern 1 : Tail

(a) Spikes - Pattern 2 : Head

(a) Spikes - Pattern 3 : Middle

(a) Spikes - Pattern 3 : Middle

(a) Spikes - Pattern 3 : Middle

(a) Spikes - Pattern 3 : Middle

(b) Constant - Pattern 1 : Range Bias

## 1893 = KATZIVELY# sat site date time dur rb mm error tb us error prec bad total AJI1 1893 2005/08/17 19:42 1 -30 ( 51 ) -------.- ( ----.- ) 47 0 / 5 AJI1 1893 2005/08/18 18:42 2 -3809 ( 18 ) -------.- ( ----.- ) 4 1 / 6 STRL 1893 2005/08/19 19:56 1 35 ( 38 ) -------.- ( ----.- ) 37 0 / 4 AJI1 1893 2005/08/21 18:03 6 -3800 ( 102 ) -4.7 ( 47.6 ) 38 0 / 14 STRL 1893 2005/08/22 19:08 3 267 ( 227 ) -44.8 ( 45.1 ) 18 2 / 7 STRL 1893 2005/08/22 20:53 4 -14 ( 32 ) 1.8 ( 14.9 ) 6 4 / 8

(b) Constant - Pattern 1 : Range Bias

## 7941 = MATERA# sat site date time dur rb mm error tb us error prec bad total AJI1 7941 2005/09/17 05:43 9 2 ( 5 ) 6.1 ( 1.4 ) 2 0 / 16 LAG2 7941 2005/09/18 06:46 2 5 ( 7 ) -------.- ( ----.- ) 4 0 / 2 AJI1 7941 2005/09/18 07:03 0 2 ( 6 ) -------.- ( ----.- ) 1 0 / 3 AJI1 7941 2005/09/18 08:55 10 6 ( 4 ) -1.2 ( 1.3 ) 2 0 / 23 STRL 7941 2005/09/19 17:09 5 1872 ( 8 ) 1.7 ( 2.4 ) 2 0 / 13 LAG1 7941 2005/09/19 20:36 39 1866 ( 5 ) 3.1 ( 2.5 ) 2 0 / 13 LAG2 7941 2005/09/19 23:09 3 -14 ( 6 ) -------.- ( ----.- ) 8 0 / 3 LAG1 7941 2005/09/20 00:13 12 -4 ( 3 ) 6.0 ( 4.6 ) 2 0 / 8

(b) Constant - Pattern 2 : Time Bias

## 8834 = WETTZELL# sat site date time dur rb mm error tb us error prec bad total STRL 8834 2005/07/30 05:28 4 2 ( 6 ) 0.1 ( 1.4 ) 8 0 / 9 STRL 8834 2005/07/30 07:16 3 30 ( 13 ) 4.8 ( 3.0 ) 4 0 / 9 AJI1 8834 2005/07/31 22:43 5 16 ( 4 ) 202.8 ( 1.7 ) 1 0 / 11 AJI1 8834 2005/08/01 00:43 12 -1 ( 21 ) 198.4 ( 6.3 ) 10 0 / 26 ETA2 8834 2005/08/01 01:09 161 -16 ( 44 ) 205.9 ( 66.9 ) 7 0 / 9 STRL 8834 2005/08/01 02:28 7 -17 ( 27 ) 198.9 ( 6.1 ) 5 0 / 6 AJI1 8834 2005/08/01 02:45 6 -28 ( 10 ) 196.9 ( 7.4 ) 3 0 / 12 STEL 8834 2005/08/01 04:10 6 46 ( 10 ) 204.6 ( 2.2 ) 3 0 / 14 STRL 8834 2005/08/01 04:18 5 2 ( 8 ) 229.2 ( 1.8 ) 3 0 / 11 STRL 8834 2005/08/01 06:05 5 4 ( 12 ) 273.2 ( 2.5 ) 3 0 / 10 STRL 8834 2005/08/01 07:56 7 8 ( 11 ) 267.1 ( 2.4 ) 4 0 / 16 LAG2 8834 2005/08/01 09:17 26 7 ( 8 ) 273.9 ( 5.9 ) 2 0 / 13 ERS2 8834 2005/08/01 10:18 3 -47 ( 46 ) 287.5 ( 11.6 ) 9 0 / 6 LAG2 8834 2005/08/01 13:19 20 7 ( 9 ) 4.0 ( 5.2 ) 6 0 / 11 STEL 8834 2005/08/01 15:31 7 -7 ( 6 ) 2.7 ( 1.3 ) 4 0 / 13

(b) Constant - Pattern 2 : Time Bias

## 7811 = BOROWIEC# sat site date time dur rb mm error tb us error prec bad total LAG1 7811 2005/08/30 23:11 24 20 ( 8 ) 1.2 ( 6.1 ) 8 0 / 14 LAG1 7811 2005/08/31 02:39 21 34 ( 8 ) -3.4 ( 7.0 ) 4 0 / 12 LAG1 7811 2005/08/31 21:47 33 29 ( 16 ) -35998.4 ( 10.5 ) 6 1 / 15 LAG1 7811 2005/09/01 20:35 22 25 ( 9 ) 4.7 ( 6.3 ) 5 0 / 13 STRL 7811 2005/09/01 22:13 5 1 ( 5 ) 0.5 ( 2.0 ) 6 0 / 12

(c) Wrong sat? Wrong date?

(d) Unexplainable

Discussions(a) Spikes

1-return NP: Handle with care (how did NASA overcame this?) Don’t jump to a conclusion that all 1-return NPs should be rejected.Reconsider the fitting function?

(b) Constant RB/TBSome stations tend to repeat this. Needs self QC?

(c) Wrong Sat, Wrong Date/Time and LeapSecWrong year: seen in January. Leap Second on 1 Jan 2006!

(d) Unexplainable???

Much improvement, compared to 90’s.Little harm to analysts, for densely tracked satellites. Hidden 3 cm error is more guilty than 3 m error.