1. NP Release Flag Conflict Toshimichi Otsubo Kashima Space Research Center National Institute of Information and Communications Technology ILRS Fall 2005 Workshop, 4 Oct 2005

2. Everyone makes mistakes, so... ILRS Normal Point: Data Record, Column 48 A flag to indicate the data release 0: first release of data 1: first replacement release of the data, 2: second replacement release, etc. It helps to keep the data set consistent at all ACs/AACs. 99999 7603901052508834100153200013583700000500907411200920001 261382714349048949913575000009009422289207300160000078 262054722460048297702910000009509422289207300400000055 263139735422047369036380000009309422289107300190000065 275684381884049423608823000008909424290407000270000080 276827395595050684305837000009609424290407000360000082

3. Recent conflict passes [1] YY DAY HR SITE WLEN SAT 05 181 14 7810 4230 9800701 05 183 22 8834 5320 9205201 05 185 23 7941 5320 7603901 05 186 22 8834 5320 7603901 05 187 04 7501 5320 7501001 05 187 14 7110 5320 6503201 05 188 05 7110 5320 0200901 05 190 12 8834 5320 9207002 05 192 17 7810 4230 9205201 05 192 17 7810 8460 9205201 05 193 09 7810 4230 6503201 05 194 03 7832 5320 8606101 05 196 19 7810 4230 9205201 05 196 19 7810 8460 9205201 05 196 23 7810 4230 0105501 05 196 23 7810 8460 0105501 05 197 01 8834 5320 0105501 05 197 01 8834 5320 9205201 05 197 03 8834 5320 8606101 05 197 03 8834 5320 8903903 05 197 04 8834 5320 6503201 05 197 04 8834 5320 9306102 05 197 05 8834 5320 8606101 05 197 06 8834 5320 6503201 05 198 18 7810 4230 0105501 05 205 00 1873 5320 6503201 05 207 17 7355 5321 7603901 05 218 18 7832 5320 0304206 05 219 03 7832 5320 9800701 05 219 17 1864 5320 6503201 05 220 21 7839 5320 0300201 05 223 04 7810 4230 0006302 05 223 04 7810 8460 0006302

4. Recent conflict passes [2] 05 228 00 7110 5320 6503201 05 228 00 7110 5320 9306102 05 228 20 7810 4230 8606101 05 228 20 7810 8460 8606101 05 230 05 7110 5320 7501001 05 230 05 7110 5320 8606101 05 230 05 7110 5320 9502101 05 230 07 7810 4230 8900103 05 230 07 7810 8460 8900103 05 230 09 7810 4230 0200901 05 230 13 8834 5320 9207002 05 234 01 7832 5320 9306102 05 234 17 1893 5320 6503201 05 234 19 1893 5320 7501001 05 239 00 8834 5320 0206001 05 240 05 7832 5320 9205201 05 240 22 8834 5320 7603901 05 241 01 7810 8460 0006302 05 241 02 7810 4230 0006302 05 241 04 8834 5320 9207002 05 241 21 8834 5320 7603901 05 242 03 8834 5320 0105302 05 242 06 8834 5320 9207002 05 242 10 8834 5320 9207002 05 242 20 8834 5320 7603901 05 243 01 8834 5320 0105302 05 243 04 8834 5320 9207002 05 243 06 8834 5320 7603901 05 243 08 8834 5320 9207002 05 244 06 7810 4230 9205201 05 244 06 7810 8460 9205201 05 244 07 8834 5320 9207002 05 244 10 8834 5320 9207002 05 244 20 7941 5320 7603901

5. Recent conflict passes [3] 05 245 00 7810 4230 7603901 05 245 04 8834 5320 9207002 05 247 04 8834 5320 7603901 05 248 11 8834 5320 9207002 05 248 18 8834 5320 7603901 05 249 05 7832 5320 7603901 05 249 17 8834 5320 7603901 05 250 07 8834 5320 7603901 05 250 07 8834 5320 9207002 05 251 05 8834 5320 7603901 05 251 13 7839 5320 9205201 05 252 11 7841 5320 9205201 05 255 17 7110 5320 6503201 05 257 02 7080 5320 8903903 05 259 02 7810 8460 0105501 05 263 22 7832 5320 0206001 05 264 23 8834 5320 9207002 05 265 03 8834 5320 9207002 05 265 23 8834 5320 7603901 05 266 00 8834 5320 0105302 05 266 01 8834 5320 9207002 05 266 05 8834 5320 9207002 05 266 06 8834 5320 7603901 05 267 06 8834 5320 0405302 05 269 07 8834 5320 9207002

6. 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” pass NP bin Legal or otherwise, this is confusing e.g. with: Flag = “0” Flag should be “1”, but sometimes “0”

7. Various SLR Outliers Detected in Daily Multi-Satellite Analysis Toshimichi Otsubo Kashima Space Research Center National Institute of Information and Communications Technology ILRS Fall 2005 Workshop, 4 Oct 2005

8. 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

10. 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

11. (a) Spikes - Pattern 1 : Tail

15. (a) Spikes - Pattern 2 : Head

16. (a) Spikes - Pattern 3 : Middle

20. (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

21. (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

22. (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

23. (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

24. (c) Wrong sat? Wrong date?

25. (d) Unexplainable

26. 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/TB Some stations tend to repeat this. Needs self QC? (c) Wrong Sat, Wrong Date/Time and LeapSec Wrong 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.