Date | SB # | Ptg. band | Obs. band | Notes | TelCal version | CBE version | Plots |
---|---|---|---|---|---|---|---|
July 04, 2010 | 1446040 | C-OSRO; C-RSRO | None | First testing script, to check if applying OSRO vs. RSRO C-band pnt results worked. Concluded that pointing algorithm was wrong since we were recovering only 60% of introduced offset. | Results | ||
Feb 10, 2011 | 3197779 | Ku-OSRO; X-OSRO |
Ku/X | Series of observations of 3C48 to compare reference pointing using Ku and X bands. Flux densities tested using Ku blind pointing, Ku reference pointing, and X reference pointing; all values within a few percent. Magnitudes of pointing solutions are comparable in X and in Ku. Further tests are planned to compareKu and X pointing solutions using deliberate offsets (day and night), as well as compring flux desnities in higher frequency bands when using Ku reference pointing. |
THIG0002.feb8.pdf | ||
July 09, 2010 | 1653099 | C-OSRO; X-OSRO | None | The target is observed with a 0", 20", and 40" offset from the phase center, and the pointing solutions should be able to recover these offsets regardless of the observing frequency. With this test we found that there is a 20-25% difference between C and X band, and none of them | Results | ||
July 09, 2010 | 1653099 | C-OSRO; X-OSRO | None | The target is observed with a 0", 20", and 40" offset from the phase center, and the pointing solutions should be able to recover these offsets regardless of the observing frequency. With this test we found that there is a 20-25% difference between C and X band, and none of them recover the offset introduced. | Results | ||
July 08, 2010 | 1646494 | C-OSRO; C-RSRO | None | C-band ptg using OSRO, RSRO 1GHz and RSRO 2GHz. The target is observed with a 0", 20", and 40" offset from the phase center, and the pointing solutions should be able to recover these offsets. Offset recovered was 30-40% lower than expected, only one set of solutions of RSRO C-band pointing. | Results | ||
July 04, 2010 | 1446040 | C-OSRO; C-RSRO | None | Script to check if applying OSRO vs. RSRO C-band pnt results worked. Too few pnt solutions to proceed with analysis (No RSRO pnt solutions). | None | ||
July 15, 2010 | 1653099 | C-OSRO; X-OSRO | None | The target is observed with a 0", 20", and 40" offset from the phase center, and the pointing solutions should be able to recover these offsets regardless of the observing frequency. Unfortunately no pointing results for X band were present in this test, so no comparison is available. But at least C-band now returns the right value for the pointing offset that we introduced. | 1.5.17 | Results | |
July 25, 2010 | 1669463 | C-OSRO; C-RSRO | C-RSRO | Script to check that OSRO and RSRO pnt give the same solutions. In between ptgs we have two standard observing scans (C-RSRO) to check for missing scans and such problems. Also, since we've had some instances with RSRO ptg not finding a solution in a 3min scan, we added an extra loop with 5min scans during RSRO ptg. Too few pnt solutions to proceed with analysis (Only one RSRO pnt solutions for when target is on phase center, but the solutions when target is offset are not present). | 1.5.18 | No results | |
July 31, 2010 | 1725585, 1725931 | C-OSRO; X-OSRO | Q/K/Ka-RSRO | On this two trials: About half the reference pointing scans failed, in the sense that they had missing data and did not find a pointing solution. Also, standard scans get dropped right after pointing. Comparing the C and Xband solutions it seems that ea12 and ea16 have a collimation error. | 1.5.20 | Results | |
July 31, 2010 | 1669463 | C-OSRO; C-RSRO | C-RSRO | Script to check that OSRO and RSRO pnt give the same solutions. This trial hosed the CBE when doing ref ptg in RSRO mode, only one valid pointing solution was found in OSRO mode, so no results are available. | 1.5.20 | None | |
July 30, 2010 | 1711833 | C-OSRO; C-RSRO | C-RSRO | same setup as SB#1669463 but observing frequency is shifted by 0.3GHz to avoid some RFI that appeared in previous test. On this two trials: the first trial has no data between the cycle of RSRO-3min-ptg and the cycle of OSRO ptg. The second time it ran there is no more data after the first cycle of RSRO pointing was completed. The OSRO ptg solutions in the attached plot come from the first run, while the RSRO ptg solutions come from the second time the SB ran. The results indicate that both OSRO and RSRO give the same solutions. | 1.5.20 | Results | |
July 28, 2010 | 1669463 | C-OSRO; C-RSRO | C-RSRO | Script to check that OSRO and RSRO pnt give the same solutions. In between ptgs we have two standard observing scans (C-RSRO) to check for missing scans and such problems. Also, since we've had some instances with RSRO ptg not finding a solution in a 3min scan, we added an extra loop with 5min scans during RSRO ptg. Results indicate that both OSRO and RSRO give the same solutions. | 1.5.20 | Results | |
Aug 08, 2010 | 1725931 | X-OSRO | Q/K/Ka-RSRO | Test designed as standard observing SB, to quantify the number of dropped scans before/after pointing. For this dataset: (1) Scans after a pointing scan are always affected. (2) Scans before a pointing scan were never affected. (3) There only one symptom: for the scans affected a fraction of the data could is present and the rest flagged (and zeroes). (4) Between 1/2 and 1/3 of the scan length is flagged and zeroed. | 1.5.22 | July 2nd | No plots, just observing strategy |
Aug 08, 2010 | 1725585 | C-OSRO | Q/K/Ka-RSRO | Test designed as standard observing SB, to quantify the number of dropped scans before/after pointing. For this dataset:(1) Scans after a pointing scan are always affected. (2) Scans before a pointing scan were never affected. (3) There only one symptom: for the scans affected a fraction of the data could is present and the rest flagged (and zeroes). (4) Between 1/2 and 1/3 of the scan length is flagged and zeroed. | 1.5.22 | July 2nd | No plots, just observing strategy |
Aug 08, 2010 | 1714472 | C-OSRO & RSRO; | K-RSRO | Test designed as standard observing SB to find a strategy for reference pointing when switching between bands during regular science observations, and to check that both RSRO and OSRO pointing give the same ptg solutions. | 1.5.22 | July 2nd | Results |
Aug 08, 2010 | 1747238 | C-OSRO | K-RSRO | Test designed as standard observing SB, to quantify the number of dropped scans before/after pointing. There is one C-band pnt scan and 4 RSRO K-band standard scans per loop, and there are a total of 10 loops. The K-band scans are 50, 43 and 30 sec long. At least for this dataset: (1) Scans after a pointing scan are always affected. (2) Scans before a pointing scan were only affected once. (3) There are three different symptoms: a scan could be completely missing (not even listed on 'listobs'), or it could be entirely flagged (and the flagged data is mostly zeroes), or a fraction of the data could be present and the rest flagged (again mostly zeroes). (4) There seems to be a dependence in the number of dropped scans after pointing and the length of the scan. For scans of 50 and 43 sec duration only the first scan after pointing is affected, but the 30 sec scans the two scans after pointing are affected. | 1.5.22 | No plots, just observing strategy | |
Aug 08, 2010 | 1747112 | C-OSRO; X-OSRO | None | On-source and off-source (offset by 40 arcseconds) test. There are no missing scans, and pointing solutions for all pointing scans were obtained. The average offset recovered by the pointing solutions is 39.5" for Cband and 35.3" for Xband. The X-band ptg results are consistently below the C-band ptg results for most antennas. Antennas 4, 20 and 26 have a quite large (and wrong) offset measured in one of the ptg sessions. In the case of ea04 the zero-point offset is too large compared to the other measurements, and for ea20 and ea26 is the 40"-offset that is too large compared to the other measurements. | 1.5.22 | July 2nd | Results |
Aug 07, 2010 | 1714472 | C-OSRO; C-RSRO | K-RSRO | Test designed as standard observing SB to find a strategy for reference pointing when switching between bands during regular science observations. No wideband data was obtained for this trial. | 1.5.22 | Aug 6 | None |
Aug 07, 2010 | 1747238 | C-OSRO | K-RSRO | Test designed as standard observing SB, to quantify the number of dropped scans before/after pointing. There is one C-band pnt scan and 4 RSRO K-band standard scans per loop, and there are a total of 10 loops. This 10 loops are split into 3 different loops, where the K-band scans are 50, 43 and 30 sec long on each loop. No wideband data was obtained for this trial. | 1.5.22 | Aug 6 | None |
Aug 07, 2010 | 1747112 | C-OSRO; X-OSRO | None | On-source and off-source test (offset by 40"). No missing scans, pointing solutions for all pointing scans were obtained. The average offset recovered by the pointing solutions is 37" for Cband and 34" for Xband. The X-band ptg results are consistently below the C-band ptg results for most antennas. | 1.5.22 | Aug 6 | Results |
Aug 11, 2010 | 1758717 | C-OSRO; X-OSRO; K-OSRO; | None | Target is observed with a 0" and 40" offset from the phase center, pointing solutions should be able to recover this offset regardless of observing frequency. C-OSRO recovers 41.9", X-OSRO 40.4" and K-OSRO 38.5". Only a few antennas get K-band ptg solutions on every loop, maybe a 40" offset is too large for K-band, need to repeat this test with 20" instead. Also, ea12 and ea16 still present a large difference between the ptg solutions for C and X,K-band, maybe due to a collimation problem (see Results #2). | 1.5.23 | July 2nd | Results Results #2 |
Aug 11, 2010 | 1766026 | C-OSRO; C-RSRO | None | Target is observed with a 0" and 40" offset from the phase center, pointing solutions should be able to recover this offset regardless of mode (either OSRO or RSRO). Test was also performed to check the previous result where scatter in C-OSRO ptg solutions was larger than for C-RSRO. Both modes recover a 42" offset, and their scatter is comparable. | 1.5.23 | July 2nd | Results |
Aug 10, 2010 | 1748981 | C-OSRO; C-RSRO; X-OSRO; | None | The target is observed with a 0" and 40" offset from the phase center, pointing solutions should be able to recover this offset regardless of the observing frequency. C-OSRO recovers 36.4", C-RSRO 37.5" and X-OSRO 36.0", but the scatter on the C-OSRO solutions seems large compared with previous tests. | 1.5.23 | July 2nd | Results |