[Information provided by Gordon Farquaharson, Radar Engineer, Nov 2005.] Ka-band Ghost Echo Analysis --------------------------- Hypothesis ---------- Raw data for processing is stored in the Ka-band radar processor memory in a ring buffer structure. A bug in synchronizing the read and write pointers of the ring buffer causes previously acquired hits to be used to form the current beam. Two manifestations of this bug are possible in the data. If the read pointer is shifted backwards relative to the correct position, then data from the most recently acquired hits will be used to create the current beam. The result is that a beam is formed that does not point exactly towards the associated azimuth angle. However, since hits are recorded every 0.016 degrees, the error is not readily noticeable. Alternatively, if the read pointer is shifted forward relative to the correct position, then hits that was recorded 1024/500=2.048 seconds ago (16.384 degrees prior to the current azimuth angle) are used to form the current beam. In this case, if the current hits contain a small signal, and the hits 2.048 seconds prior contain a strong signal, the strong signal will dominate, and the current beam will contain an attenuated version of the features 2.048 observed seconds ago. These are the ghost echos that are observed in the RICO Ka-band data. The bug in synchronizing the read and write pointers stems from the logic in the radar processor that tries to add and subtract hits from the current beam so that beams are always synchronized with the GPS 1 pulse per second signal. Thus, ghost echos should only occur after a non-50 hit beam, and when the cumulative corrected hits for the current beam is greater than 0. This means that ghost echo can come and go, depending on the value of the cumulative corrected hits. Method ------ Verification of this hypothesis was conducted using data collected during from the end of December 2004 to January 2005. Non-50 hit beams are listed, and associated observations of ghost echos are used to determine whether ghosting is present. The last column in the data presented below is my guess of the cumulative corrected hits. It is calculated by accumulating the second last column which is the number of hits each corrected beam deviates from 50. I have tried to take into account radar processor reboots, but I think that the log is not complete. Where reasonable, I have guessed form the data that the processor was rebooted. Notes: 1. I only use the 1.3 and 1.5 degree sweeps to detect ghost echos. Mostly, I have only concentrated on the tower, but when the tower echo is obscured by weather, I try to use weather echos to detect ghosting. This means that I will not necessarily detect all ghost echo events. 2. The beam data below is grouped by volume number. Results ------- Observations of 1.5 degree elevation scans of a tower on Barbuda show that the ghost echo is located 16.05 degrees from the real echo in azimuth, as predicted above. 2004.12.28 ---------- No ghost echos observed throughout the day. S: 20041228 101511.10 2452354519 K:19700101 024639.00,Kh: 51 +1 +1 S: 20041228 102118.10 2452358189 K:19700101 024639.00,Kh: 51 +1 +2 S: 20041228 102123.10 2452358239 K:19700101 024639.00,Kh: 49 -1 +1 S: 20041228 102129.10 2452358299 K:19700101 024639.00,Kh: 49 -1 0 S: 20041228 102140.10 2452358409 K:19700101 024639.00,Kh: 49 -1 -1 S: 20041228 102145.10 2452358459 K:19700101 024639.00,Kh: 49 -1 -2 S: 20041228 102203.10 2452358639 K:19700101 024639.00,Kh: 49 -1 -3 S: 20041228 142057.10 2452501979 K:19700101 024639.00,Kh: 51 +1 -2 S: 20041228 142101.10 2452502019 K:19700101 024639.00,Kh: 49 -1 -3 S: 20041228 142112.10 2452502129 K:19700101 024639.00,Kh: 49 -1 -4 S: 20041228 142116.10 2452502169 K:19700101 024639.00,Kh: 52 +2 -2 S: 20041228 142121.10 2452502219 K:19700101 024639.00,Kh: 49 -1 -3 S: 20041228 142128.10 2452502289 K:19700101 024639.00,Kh: 49 -1 -4 S: 20041228 182008.10 2452645489 K:19700101 024639.00,Kh: 51 +1 -3 S: 20041228 182012.10 2452645529 K:19700101 024639.00,Kh: 51 +1 -2 S: 20041228 182016.10 2452645569 K:19700101 024639.00,Kh: 52 +2 0 S: 20041228 182032.10 2452645729 K:19700101 024639.00,Kh: 52 +2 +2 2004.12.29 ---------- No ghost echos observed at the start of the day. S: 20041229 095533.10 2453206739 K:19700101 024639.00,Kh: 51 +1 +1 S: 20041229 095537.10 2453206779 K:19700101 024639.00,Kh: 49 -1 0 S: 20041229 095541.10 2453206819 K:19700101 024639.00,Kh: 51 +1 +1 S: 20041229 095548.10 2453206889 K:19700101 024639.00,Kh: 49 -1 0 S: 20041229 095552.10 2453206929 K:19700101 024639.00,Kh: 49 -1 -1 S: 20041229 095556.10 2453206969 K:19700101 024639.00,Kh: 51 +1 0 S: 20041229 095601.10 2453207019 K:19700101 024639.00,Kh: 51 +1 +1 S: 20041229 095605.10 2453207059 K:19700101 024639.00,Kh: 48 -2 -1 S: 20041229 095614.10 2453207149 K:19700101 024639.00,Kh: 49 -1 -2 S: 20041229 095627.10 2453207279 K:19700101 024639.00,Kh: 49 -1 -3 S: 20041229 095638.10 2453207389 K:19700101 024639.00,Kh: 49 -1 -4 Ka-band shutdown at 13:04 according to log. Cumulative corrected hits reset to 0. S: 20041229 132512.10 2453332529 K:19700101 024639.00,Kh: 51 +1 +1 S: 20041229 132516.20 2453332570 K:19700101 024639.00,Kh: 48 -2 -1 S: 20041229 132526.10 2453332669 K:19700101 024639.00,Kh: 49 -1 -2 S: 20041229 132543.10 2453332839 K:19700101 024639.00,Kh: 49 -1 -3 S: 20041229 132551.10 2453332919 K:19700101 024639.00,Kh: 51 +1 -2 S: 20041229 133243.10 2453337039 K:19700101 024639.00,Kh: 51 +1 -1 S: 20041229 133247.10 2453337079 K:19700101 024639.00,Kh: 51 +1 0 S: 20041229 133303.10 2453337239 K:19700101 024639.00,Kh: 52 +2 +2 S: 20041229 133318.20 2453337390 K:19700101 024639.00,Kh: 52 +2 +4 Ghost echos observed in image 13:36:08. Solar offset calibration finished at 14:08 according to log (actually looks like 14:18 from the data). Was the system shutdown at this point ? I'm going to presume so, and reset the cumulative corrected hits to 0. S: 20041229 164149.10 2453450499 K:19700101 024639.00,Kh: 51 +1 +1 S: 20041229 164153.10 2453450539 K:19700101 024639.00,Kh: 49 -1 0 S: 20041229 164158.10 2453450589 K:19700101 024639.00,Kh: 49 -1 -1 S: 20041229 164202.10 2453450629 K:19700101 024639.00,Kh: 48 -2 -3 S: 20041229 164206.10 2453450669 K:19700101 024639.00,Kh: 49 -1 -4 S: 20041229 164210.10 2453450709 K:19700101 024639.00,Kh: 49 -1 -5 S: 20041229 164214.10 2453450749 K:19700101 024639.00,Kh: 52 +2 -3 S: 20041229 164218.10 2453450789 K:19700101 024639.00,Kh: 49 -1 -4 S: 20041229 164222.10 2453450829 K:19700101 024639.00,Kh: 49 -1 -5 S: 20041229 164229.10 2453450899 K:19700101 024639.00,Kh: 49 -1 -6 No ghost echos observed after system restart. S: 20041229 204355.10 2453595759 K:19700101 024639.00,Kh: 49 -1 -7 S: 20041229 204359.10 2453595799 K:19700101 024639.00,Kh: 52 +2 -5 S: 20041229 204407.10 2453595879 K:19700101 024639.00,Kh: 49 -1 -6 S: 20041229 204411.10 2453595919 K:19700101 024639.00,Kh: 52 +2 -4 S: 20041229 204416.10 2453595969 K:19700101 024639.00,Kh: 49 -1 -5 2004.12.30 ---------- S: 20041230 095817.10 2454072379 K:19700101 024639.00,Kh: 51 +1 +1 S: 20041230 095821.10 2454072419 K:19700101 024639.00,Kh: 52 +2 +3 S: 20041230 095825.10 2454072459 K:19700101 024639.00,Kh: 52 +2 +5 S: 20041230 095833.10 2454072539 K:19700101 024639.00,Kh: 49 -1 +4 S: 20041230 095846.10 2454072669 K:19700101 024639.00,Kh: 49 -1 +3 S: 20041230 095850.10 2454072709 K:19700101 024639.00,Kh: 49 -1 +2 S: 20041230 095854.10 2454072749 K:19700101 024639.00,Kh: 51 +1 +3 S: 20041230 095858.10 2454072789 K:19700101 024639.00,Kh: 49 -1 +2 S: 20041230 095903.10 2454072839 K:19700101 024639.00,Kh: 49 -1 +1 Ka-band stopped at 12:50 according to log. Resetting cumulative corrected hits to 0. S: 20041230 131833.10 2454192539 K:19700101 024639.00,Kh: 51 +1 +1 S: 20041230 131837.10 2454192579 K:19700101 024639.00,Kh: 48 -2 -1 S: 20041230 131841.10 2454192619 K:19700101 024639.00,Kh: 49 -1 -2 S: 20041230 131849.10 2454192699 K:19700101 024639.00,Kh: 49 -1 -3 S: 20041230 131853.10 2454192739 K:19700101 024639.00,Kh: 52 +2 -1 S: 20041230 131857.10 2454192779 K:19700101 024639.00,Kh: 49 -1 -2 S: 20041230 131918.10 2454192989 K:19700101 024639.00,Kh: 49 -1 -3 Sweepfiles jump from 12:49 to 13:30. Presuming the system was restarted. Resetting cumulative hits to 0. S: 20041230 132529.20 2454196700 K:19700101 024639.00,Kh: 51 +1 +1 S: 20041230 132537.10 2454196779 K:19700101 024639.00,Kh: 51 +1 +2 S: 20041230 132541.20 2454196820 K:19700101 024639.00,Kh: 51 +1 +3 S: 20041230 132550.10 2454196909 K:19700101 024639.00,Kh: 51 +1 +4 S: 20041230 132607.20 2454197080 K:19700101 024639.00,Kh: 49 -1 +3 S: 20041230 132615.10 2454197159 K:19700101 024639.00,Kh: 49 -1 +2 Ghosting appears in the 13:30:56 scan. No 1.3/1.5 degrees scans after 17:24:05. S: 20041230 172956.10 2454343369 K:19700101 024639.00,Kh: 51 +1 +1 S: 20041230 173003.10 2454343439 K:19700101 024639.00,Kh: 49 -1 0 S: 20041230 173007.10 2454343479 K:19700101 024639.00,Kh: 49 -1 -1 S: 20041230 173011.10 2454343519 K:19700101 024639.00,Kh: 49 -1 -2 S: 20041230 173015.10 2454343559 K:19700101 024639.00,Kh: 52 +2 0 2004.12.31 ---------- No ghost echos observed throughout the day. S: 20041231 115404.10 2455005849 K:19700101 024639.00,Kh: 51 +1 +1 S: 20041231 115410.10 2455005909 K:19700101 024639.00,Kh: 49 -1 0 S: 20041231 115416.10 2455005969 K:19700101 024639.00,Kh: 49 -1 -1 S: 20041231 115420.10 2455006009 K:19700101 024639.00,Kh: 49 -1 -2 S: 20041231 115432.10 2455006129 K:19700101 024639.00,Kh: 49 -1 -3 S: 20041231 155349.10 2455149699 K:19700101 024639.00,Kh: 51 +1 -2 S: 20041231 155353.10 2455149739 K:19700101 024639.00,Kh: 51 +1 -1 S: 20041231 155357.10 2455149779 K:19700101 024639.00,Kh: 52 +2 +1 S: 20041231 155401.10 2455149819 K:19700101 024639.00,Kh: 52 +2 +3 S: 20041231 155419.10 2455149999 K:19700101 024639.00,Kh: 49 -1 +2 S: 20041231 155423.10 2455150039 K:19700101 024639.00,Kh: 49 -1 +1 Ka-band system shutdown at 19:07 according to log. S: 20041231 191021.20 2455267620 K:19700101 024639.00,Kh: 51 +1 +1 S: 20041231 191033.10 2455267739 K:19700101 024639.00,Kh: 48 -2 -1 S: 20041231 191037.10 2455267779 K:19700101 024639.00,Kh: 51 +1 0 S: 20041231 191041.10 2455267819 K:19700101 024639.00,Kh: 49 -1 -1 S: 20041231 191045.10 2455267859 K:19700101 024639.00,Kh: 49 -1 -2 S: 20041231 191049.10 2455267899 K:19700101 024639.00,Kh: 48 -2 -4 Ka-band system shutdown at 19:44 according to log. S: 20041231 195006.20 2455291470 K:19700101 024639.00,Kh: 51 +1 +1 S: 20041231 195028.10 2455291689 K:19700101 024639.00,Kh: 49 -1 0 S: 20041231 195039.10 2455291799 K:19700101 024639.00,Kh: 49 -1 -1 2005.01.01 ---------- No sweepfiles available. S: 20040101 104422.10 2455828029 K:19700101 024639.00,Kh: 51 +1 +1 2005.01.02 ---------- No tower ghost echos observed throughout the day. S: 20050102 102357.10 2456679779 K:19700101 024639.00,Kh: 49 -1 -1 S: 20050102 141901.10 2456820819 K:19700101 024639.00,Kh: 51 +1 0 S: 20050102 141905.10 2456820859 K:19700101 024639.00,Kh: 51 +1 +1 S: 20050102 141909.10 2456820899 K:19700101 024639.00,Kh: 49 -1 0 S: 20050102 141913.10 2456820939 K:19700101 024639.00,Kh: 49 -1 -1 S: 20050102 141917.10 2456820979 K:19700101 024639.00,Kh: 49 -1 -2 S: 20050102 141923.10 2456821039 K:19700101 024639.00,Kh: 49 -1 -3 S: 20050102 141933.10 2456821139 K:19700101 024639.00,Kh: 49 -1 -4 S: 20050102 145100.10 2456840009 K:19700101 024639.00,Kh: 51 +1 -3 S: 20050102 145104.20 2456840050 K:19700101 024639.00,Kh: 51 +1 -2 S: 20050102 145116.10 2456840169 K:19700101 024639.00,Kh: 49 -1 -3 S: 20050102 145121.10 2456840219 K:19700101 024639.00,Kh: 49 -1 -4 S: 20050102 145125.10 2456840259 K:19700101 024639.00,Kh: 49 -1 -5 S: 20050102 145129.10 2456840299 K:19700101 024639.00,Kh: 49 -1 -6 2005.01.03 ---------- No tower ghost echos observed throughout the day. S: 20050103 110019.10 2457565599 K:19700101 024639.00,Kh: 49 -1 -1 S: 20050103 160507.10 2457748479 K:19700101 024639.00,Kh: 51 +1 0 S: 20050103 160511.10 2457748519 K:19700101 024639.00,Kh: 52 +2 +2 S: 20050103 160518.10 2457748589 K:19700101 024639.00,Kh: 49 -1 +1 S: 20050103 160522.10 2457748629 K:19700101 024639.00,Kh: 51 +1 +2 S: 20050103 160536.10 2457748769 K:19700101 024639.00,Kh: 49 -1 +1 S: 20050103 160550.10 2457748909 K:19700101 024639.00,Kh: 49 -1 0 2005.01.04 ---------- S: 20050104 101506.10 2458402469 K:19700101 024639.00,Kh: 51 +1 +1 S: 20050104 101510.10 2458402509 K:19700101 024639.00,Kh: 52 +2 +3 S: 20050104 101514.10 2458402549 K:19700101 024639.00,Kh: 52 +2 +5 S: 20050104 101519.10 2458402599 K:19700101 024639.00,Kh: 49 -1 +4 S: 20050104 101523.10 2458402639 K:19700101 024639.00,Kh: 51 +1 +5 S: 20050104 101527.10 2458402679 K:19700101 024639.00,Kh: 51 +1 +6 S: 20050104 101531.10 2458402719 K:19700101 024639.00,Kh: 48 -2 +4 S: 20050104 101535.10 2458402759 K:19700101 024639.00,Kh: 51 +1 +5 S: 20050104 101540.10 2458402809 K:19700101 024639.00,Kh: 49 -1 +4 S: 20050104 101544.10 2458402849 K:19700101 024639.00,Kh: 49 -1 +3 Ka-band system up at 10:20 according to log. Resetting cumulative corrected hits to 0. Data shows that the Ka-band transmitter is stabilized at 10:24. No tower ghost echos observed throughout the day. S: 20050104 140519.10 2458540599 K:19700101 024639.00,Kh: 51 +1 +1 S: 20050104 140523.10 2458540639 K:19700101 024639.00,Kh: 48 -2 -1 S: 20050104 140527.10 2458540679 K:19700101 024639.00,Kh: 48 -2 -3 S: 20050104 140538.10 2458540789 K:19700101 024639.00,Kh: 49 -1 -4 S: 20050104 140542.20 2458540830 K:19700101 024639.00,Kh: 49 -1 -5 S: 20050104 190844.10 2458722649 K:19700101 024639.00,Kh: 49 -1 -6 S: 20050104 190848.10 2458722689 K:19700101 024639.00,Kh: 52 +2 -4 S: 20050104 190854.10 2458722749 K:19700101 024639.00,Kh: 49 -1 -5 S: 20050104 190909.10 2458722899 K:19700101 024639.00,Kh: 49 -1 -6 S: 20050104 190920.10 2458723009 K:19700101 024639.00,Kh: 49 -1 -7 S: 20050104 190924.10 2458723049 K:19700101 024639.00,Kh: 49 -1 -8 2005.01.05 ---------- No tower ghost echos observed throughout the day. S: 20050105 102457.10 2459272379 K:19700101 024639.00,Kh: 51 +1 +1 S: 20050105 102501.10 2459272419 K:19700101 024639.00,Kh: 49 -1 0 S: 20050105 102505.10 2459272459 K:19700101 024639.00,Kh: 51 +1 +1 S: 20050105 102509.10 2459272499 K:19700101 024639.00,Kh: 48 -2 -1 S: 20050105 102513.10 2459272539 K:19700101 024639.00,Kh: 51 +1 0 S: 20050105 102517.10 2459272579 K:19700101 024639.00,Kh: 51 +1 +1 S: 20050105 102521.10 2459272619 K:19700101 024639.00,Kh: 49 -1 0 S: 20050105 102530.10 2459272709 K:19700101 024639.00,Kh: 49 -1 -1 S: 20050105 102534.10 2459272749 K:19700101 024639.00,Kh: 49 -1 -2 S: 20050105 102538.10 2459272789 K:19700101 024639.00,Kh: 49 -1 -3 S: 20050105 102545.10 2459272859 K:19700101 024639.00,Kh: 49 -1 -4 S: 20050105 102554.10 2459272949 K:19700101 024639.00,Kh: 49 -1 -5 S: 20050105 123341.10 2459349619 K:19700101 024639.00,Kh: 51 +1 -4 S: 20050105 123345.10 2459349659 K:19700101 024639.00,Kh: 48 -2 -6 S: 20050105 123352.10 2459349729 K:19700101 024639.00,Kh: 49 -1 -7 S: 20050105 123400.10 2459349809 K:19700101 024639.00,Kh: 49 -1 -8 S: 20050105 144116.20 2459426170 K:19700101 024639.00,Kh: 51 +1 -7 S: 20050105 164840.20 2459502610 K:19700101 024639.00,Kh: 51 +1 -6 S: 20050105 164844.20 2459502650 K:19700101 024639.00,Kh: 51 +1 -5 S: 20050105 164848.20 2459502690 K:19700101 024639.00,Kh: 49 -1 -6 S: 20050105 164856.10 2459502769 K:19700101 024639.00,Kh: 49 -1 -7 S: 20050105 185557.20 2459578980 K:19700101 024639.00,Kh: 51 +1 -6 S: 20050105 210237.20 2459654980 K:19700101 024639.00,Kh: 51 +1 -5 2005.01.06 ---------- S: 20050106 102657.10 2460137579 K:19700101 024639.00,Kh: 51 +1 +1 S: 20050106 102701.10 2460137619 K:19700101 024639.00,Kh: 52 +2 +3 S: 20050106 102707.10 2460137679 K:19700101 024639.00,Kh: 49 -1 +2 S: 20050106 102711.10 2460137719 K:19700101 024639.00,Kh: 49 -1 +1 S: 20050106 102716.10 2460137769 K:19700101 024639.00,Kh: 49 -1 0 S: 20050106 102720.10 2460137809 K:19700101 024639.00,Kh: 49 -1 -1 S: 20050106 102724.10 2460137849 K:19700101 024639.00,Kh: 51 +1 0 S: 20050106 102728.10 2460137889 K:19700101 024639.00,Kh: 49 -1 -1 S: 20050106 102732.10 2460137929 K:19700101 024639.00,Kh: 49 -1 -2 S: 20050106 102736.10 2460137969 K:19700101 024639.00,Kh: 52 +2 0 S: 20050106 102740.10 2460138009 K:19700101 024639.00,Kh: 49 -1 -1 Ka-band transmitter stabilized at 10:38:18. No tower ghost echos observed. S: 20050106 142326.10 2460279469 K:19700101 024639.00,Kh: 51 +1 0 S: 20050106 142331.10 2460279519 K:19700101 024639.00,Kh: 49 -1 -1 S: 20050106 142335.10 2460279559 K:19700101 024639.00,Kh: 49 -1 -2 S: 20050106 142339.10 2460279599 K:19700101 024639.00,Kh: 48 -2 -4 S: 20050106 142343.10 2460279639 K:19700101 024639.00,Kh: 49 -1 -5 S: 20050106 142347.10 2460279679 K:19700101 024639.00,Kh: 51 +1 -4 S: 20050106 142351.10 2460279719 K:19700101 024639.00,Kh: 49 -1 -5 2005.01.07 ---------- S: 20050107 100253.10 2460987139 K:19700101 024639.00,Kh: 49 -1 -1 S: 20050107 100305.10 2460987259 K:19700101 024639.00,Kh: 51 +1 0 S: 20050107 100309.10 2460987299 K:19700101 024639.00,Kh: 51 +1 +1 S: 20050107 100313.10 2460987339 K:19700101 024639.00,Kh: 49 -1 0 S: 20050107 100321.10 2460987419 K:19700101 024639.00,Kh: 49 -1 -1 Sweepfiles start at 10:13:28. No tower ghost echos at this time. RDAs rebooted at 13:04 according to the log. Does this mean that the Ka-band system was restarted ? Let's presume so, and set the cumulative corrected hits to 0. S: 20050107 135534.10 2461126749 K:19700101 024639.00,Kh: 51 +1 +1 S: 20050107 135546.10 2461126869 K:19700101 024639.00,Kh: 52 +2 +3 S: 20050107 135556.10 2461126969 K:19700101 024639.00,Kh: 49 -1 +2 Tower ghost echos appear in sweep 13:58:51 and remain for the rest of the day. S: 20050107 174541.10 2461264819 K:19700101 024639.00,Kh: 51 +1 +3 S: 20050107 174551.10 2461264919 K:19700101 024639.00,Kh: 49 -1 +2 S: 20050107 174555.10 2461264959 K:19700101 024639.00,Kh: 52 +2 +4 S: 20050107 174559.10 2461264999 K:19700101 024639.00,Kh: 52 +2 +6 S: 20050107 174603.10 2461265039 K:19700101 024639.00,Kh: 49 -1 +5 S: 20050107 174609.10 2461265099 K:19700101 024639.00,Kh: 49 -1 +4 2005.01.08 ---------- S: 20050108 101417.10 2461857979 K:19700101 024639.00,Kh: 51 +1 +1 S: 20050108 101433.10 2461858139 K:19700101 024639.00,Kh: 48 -2 -1 S: 20050108 101442.10 2461858229 K:19700101 024639.00,Kh: 49 -1 -2 S: 20050108 101502.10 2461858429 K:19700101 024639.00,Kh: 49 -1 -3 Ka-band transmitter stabilized at 10:24:42. No tower ghost echos observed. S: 20050108 140846.10 2461998669 K:19700101 024639.00,Kh: 51 +1 -2 S: 20050108 140850.10 2461998709 K:19700101 024639.00,Kh: 51 +1 -1 S: 20050108 140854.10 2461998749 K:19700101 024639.00,Kh: 49 -1 -2 S: 20050108 140858.10 2461998789 K:19700101 024639.00,Kh: 52 +2 0 S: 20050108 140902.10 2461998829 K:19700101 024639.00,Kh: 49 -1 -1 S: 20050108 140906.10 2461998869 K:19700101 024639.00,Kh: 52 +2 +1 2005.01.09 ---------- S: 20050109 101447.10 2462722279 K:19700101 024639.00,Kh: 51 +1 +1 S: 20050109 101451.10 2462722319 K:19700101 024639.00,Kh: 48 -2 -1 S: 20050109 101455.10 2462722359 K:19700101 024639.00,Kh: 49 -1 -2 S: 20050109 101459.10 2462722399 K:19700101 024639.00,Kh: 48 -2 -4 S: 20050109 101504.10 2462722449 K:19700101 024639.00,Kh: 49 -1 -5 S: 20050109 101508.10 2462722489 K:19700101 024639.00,Kh: 49 -1 -6 S: 20050109 101526.10 2462722669 K:19700101 024639.00,Kh: 48 -2 -8 Ka-band transmitter stabilized at 10:29:07. Weather echos obscure tower echos. (Good blockage map for Ka-band). There does not appear to be ghosting but it is hard to tell. S: 20050109 140739.10 2462861999 K:19700101 024639.00,Kh: 51 +1 -7 S: 20050109 140743.10 2462862039 K:19700101 024639.00,Kh: 52 +2 -5 S: 20050109 140747.10 2462862079 K:19700101 024639.00,Kh: 51 +1 -4 S: 20050109 140751.10 2462862119 K:19700101 024639.00,Kh: 51 +1 -3 S: 20050109 140755.10 2462862159 K:19700101 024639.00,Kh: 49 -1 -4 S: 20050109 140759.10 2462862199 K:19700101 024639.00,Kh: 49 -1 -5 S: 20050109 140803.10 2462862239 K:19700101 024639.00,Kh: 49 -1 -6 S: 20050109 140816.10 2462862369 K:19700101 024639.00,Kh: 49 -1 -7 S: 20050109 175859.10 2463000799 K:19700101 024639.00,Kh: 51 +1 -6 S: 20050109 175903.10 2463000839 K:19700101 024639.00,Kh: 52 +2 -4 S: 20050109 175907.10 2463000879 K:19700101 024639.00,Kh: 51 +1 -3 S: 20050109 175911.10 2463000919 K:19700101 024639.00,Kh: 52 +2 -1 S: 20050109 175915.10 2463000959 K:19700101 024639.00,Kh: 51 +1 0 S: 20050109 175919.10 2463000999 K:19700101 024639.00,Kh: 51 +1 +1 S: 20050109 175926.10 2463001069 K:19700101 024639.00,Kh: 49 -1 0 S: 20050109 175930.10 2463001109 K:19700101 024639.00,Kh: 49 -1 -1 S: 20050109 175934.10 2463001149 K:19700101 024639.00,Kh: 52 +2 +1 Ka-band transmitter shut-off at around 21:33, so I am unable to tell if the next period contains ghost echos. S: 20050109 214805.20 2463138260 K:19700101 024639.00,Kh: 51 +1 +2 S: 20050109 214809.20 2463138300 K:19700101 024639.00,Kh: 49 -1 +1 S: 20050109 214814.10 2463138349 K:19700101 024639.00,Kh: 49 -1 0 S: 20050109 214820.10 2463138409 K:19700101 024639.00,Kh: 49 -1 -1 S: 20050109 214824.20 2463138450 K:19700101 024639.00,Kh: 52 +2 +1 S: 20050109 214828.20 2463138490 K:19700101 024639.00,Kh: 52 +2 +3 S: 20050109 215916.10 2463144969 K:19700101 024639.00,Kh: 51 +1 +4 S: 20050109 215937.10 2463145179 K:19700101 024639.00,Kh: 49 -1 +3 S: 20050109 215942.10 2463145229 K:19700101 024639.00,Kh: 49 -1 +2 S: 20050109 215947.10 2463145279 K:19700101 024639.00,Kh: 49 -1 +1 S: 20050109 215951.10 2463145319 K:19700101 024639.00,Kh: 49 -1 0 S: 20050109 215955.10 2463145359 K:19700101 024639.00,Kh: 49 -1 -1 S: 20050109 215959.10 2463145399 K:19700101 024639.00,Kh: 49 -1 -2 S: 20050109 220509.10 2463148499 K:19700101 024639.00,Kh: 51 +1 -1 S: 20050109 220513.10 2463148539 K:19700101 024639.00,Kh: 48 -2 -3 S: 20050109 220526.10 2463148669 K:19700101 024639.00,Kh: 49 -1 -4 S: 20050109 220530.10 2463148709 K:19700101 024639.00,Kh: 51 +1 -3 Ka-band transmitter turned on again at around 22:19. 2005.01.10 ---------- No tower ghost echos observed throughout the day. S: 20050110 141529.10 2463730699 K:19700101 024639.00,Kh: 51 +1 +1 S: 20050110 141539.10 2463730799 K:19700101 024639.00,Kh: 51 +1 +2 S: 20050110 141548.10 2463730889 K:19700101 024639.00,Kh: 49 -1 +1 S: 20050110 141553.10 2463730939 K:19700101 024639.00,Kh: 49 -1 0 S: 20050110 181059.20 2463872000 K:19700101 024639.00,Kh: 51 +1 +1 S: 20050110 181103.10 2463872039 K:19700101 024639.00,Kh: 51 +1 +2 S: 20050110 181107.10 2463872079 K:19700101 024639.00,Kh: 52 +2 +4 S: 20050110 181111.10 2463872119 K:19700101 024639.00,Kh: 48 -2 +2 S: 20050110 181115.10 2463872159 K:19700101 024639.00,Kh: 51 +1 +3 S: 20050110 181119.10 2463872199 K:19700101 024639.00,Kh: 49 -1 +2 S: 20050110 181130.10 2463872309 K:19700101 024639.00,Kh: 49 -1 +1 S: 20050110 181134.10 2463872349 K:19700101 024639.00,Kh: 49 -1 0 2005.01.11 ---------- Tower ghost echos present at the start of the day. S: 20050111 105754.20 2464476150 K:19700101 024639.00,Kh: 51 +1 +1 S: 20050111 105758.10 2464476189 K:19700101 024639.00,Kh: 52 +2 +3 S: 20050111 105802.10 2464476229 K:19700101 024639.00,Kh: 48 -2 +1 S: 20050111 105806.10 2464476269 K:19700101 024639.00,Kh: 51 +1 +2 S: 20050111 105810.10 2464476309 K:19700101 024639.00,Kh: 49 -1 +1 S: 20050111 105814.10 2464476349 K:19700101 024639.00,Kh: 52 +2 +3 S: 20050111 105827.10 2464476479 K:19700101 024639.00,Kh: 49 -1 +2 S: 20050111 144907.10 2464614879 K:19700101 024639.00,Kh: 51 +1 +3 S: 20050111 144912.10 2464614929 K:19700101 024639.00,Kh: 51 +1 +4 S: 20050111 144916.10 2464614969 K:19700101 024639.00,Kh: 51 +1 +5 S: 20050111 144921.10 2464615019 K:19700101 024639.00,Kh: 49 -1 +4 S: 20050111 144927.10 2464615079 K:19700101 024639.00,Kh: 49 -1 +3 S: 20050111 144935.10 2464615159 K:19700101 024639.00,Kh: 49 -1 +2 S: 20050111 144940.10 2464615209 K:19700101 024639.00,Kh: 49 -1 +1 After this time (14:50), tower ghost echos disappear. Cumulative corrected hits at this point is +1. S: 20050111 183817.10 2464752379 K:19700101 024639.00,Kh: 51 +1 +2 S: 20050111 183821.10 2464752419 K:19700101 024639.00,Kh: 49 -1 +1 S: 20050111 183825.10 2464752459 K:19700101 024639.00,Kh: 52 +2 +3 S: 20050111 183829.10 2464752499 K:19700101 024639.00,Kh: 49 -1 +2 S: 20050111 183833.10 2464752539 K:19700101 024639.00,Kh: 49 -1 +1 S: 20050111 183837.10 2464752579 K:19700101 024639.00,Kh: 49 -1 0 S: 20050111 183841.10 2464752619 K:19700101 024639.00,Kh: 49 -1 -1 Tower ghost echos do not reappear after this burst of hit corrections. 2005.01.12 ---------- No ghost echos observed throughout the day. S: 20050112 141909.10 2465460899 K:19700101 024639.00,Kh: 51 +1 +1 S: 20050112 141913.10 2465460939 K:19700101 024639.00,Kh: 48 -2 -1 S: 20050112 141917.10 2465460979 K:19700101 024639.00,Kh: 52 +2 +1 S: 20050112 141923.10 2465461039 K:19700101 024639.00,Kh: 51 +1 +2 S: 20050112 141927.10 2465461079 K:19700101 024639.00,Kh: 48 -2 0 S: 20050112 141931.10 2465461119 K:19700101 024639.00,Kh: 49 -1 -1 S: 20050112 141935.10 2465461159 K:19700101 024639.00,Kh: 49 -1 -2 S: 20050112 141945.10 2465461259 K:19700101 024639.00,Kh: 49 -1 -3 2005.01.13 ---------- No non-50 hit beams recorded. 2005.01.14 ---------- No tower ghost echos observed throughout the day. It is also interesting that there are no hit corrections at the start of the day. S: 20050114 141058.10 2467183989 K:19700101 024639.00,Kh: 51 +1 +1 S: 20050114 141102.10 2467184029 K:19700101 024639.00,Kh: 52 +2 +3 S: 20050114 141106.10 2467184069 K:19700101 024639.00,Kh: 49 -1 +2 S: 20050114 141110.10 2467184109 K:19700101 024639.00,Kh: 49 -1 +1 S: 20050114 141114.10 2467184149 K:19700101 024639.00,Kh: 49 -1 0 S: 20050114 141120.10 2467184209 K:19700101 024639.00,Kh: 49 -1 -1 S: 20050114 141130.10 2467184309 K:19700101 024639.00,Kh: 49 -1 -2 S: 20050114 175158.10 2467316589 K:19700101 024639.00,Kh: 51 +1 +1 S: 20050114 175202.10 2467316629 K:19700101 024639.00,Kh: 51 +1 +2 S: 20050114 175207.10 2467316679 K:19700101 024639.00,Kh: 49 -1 +1 S: 20050114 175216.10 2467316769 K:19700101 024639.00,Kh: 49 -1 0 S: 20050114 175258.10 2467317189 K:19700101 024639.00,Kh: 49 -1 -1 S: 20050114 213031.20 2467447720 K:19700101 024639.00,Kh: 51 +1 0 S: 20050114 213035.20 2467447760 K:19700101 024639.00,Kh: 49 -1 -1 S: 20050114 213039.10 2467447799 K:19700101 024639.00,Kh: 48 -2 -3 S: 20050114 213047.10 2467447879 K:19700101 024639.00,Kh: 49 -1 -4 S: 20050114 213052.10 2467447929 K:19700101 024639.00,Kh: 49 -1 -5 S: 20050114 213056.10 2467447969 K:19700101 024639.00,Kh: 49 -1 -6 S: 20050114 213102.10 2467448029 K:19700101 024639.00,Kh: 49 -1 -7 2005.01.16 ---------- No ghost echos observed throughout the day. S: 20050116 101342.10 2468769629 K:19700101 024639.00,Kh: 48 -2 -2 S: 20050116 101346.20 2468769670 K:19700101 024639.00,Kh: 51 +1 -1 S: 20050116 101356.10 2468769769 K:19700101 024639.00,Kh: 49 -1 -2 S: 20050116 101409.10 2468769899 K:19700101 024639.00,Kh: 49 -1 -3 S: 20050116 101414.20 2468769950 K:19700101 024639.00,Kh: 49 -1 -4 S: 20050116 101422.10 2468770029 K:19700101 024639.00,Kh: 49 -1 -5 S: 20050116 135721.10 2468903819 K:19700101 024639.00,Kh: 51 +1 -4 S: 20050116 135725.10 2468903859 K:19700101 024639.00,Kh: 49 -1 -5 S: 20050116 135731.10 2468903919 K:19700101 024639.00,Kh: 49 -1 -6 S: 20050116 135735.10 2468903959 K:19700101 024639.00,Kh: 49 -1 -7 S: 20050116 135739.10 2468903999 K:19700101 024639.00,Kh: 52 +2 -5 S: 20050116 135745.10 2468904059 K:19700101 024639.00,Kh: 49 -1 -6 S: 20050116 135754.10 2468904149 K:19700101 024639.00,Kh: 49 -1 -7 S: 20050116 173925.10 2469037059 K:19700101 024639.00,Kh: 51 +1 -6 S: 20050116 173929.10 2469037099 K:19700101 024639.00,Kh: 51 +1 -5 S: 20050116 173933.10 2469037139 K:19700101 024639.00,Kh: 51 +1 -4 S: 20050116 173937.10 2469037179 K:19700101 024639.00,Kh: 51 +1 -3 S: 20050116 173943.10 2469037239 K:19700101 024639.00,Kh: 49 -1 -4 S: 20050116 173947.20 2469037280 K:19700101 024639.00,Kh: 51 +1 -3 S: 20050116 173951.10 2469037319 K:19700101 024639.00,Kh: 49 -1 -4 S: 20050116 211923.20 2469169040 K:19700101 024639.00,Kh: 51 +1 -3 S: 20050116 211931.10 2469169119 K:19700101 024639.00,Kh: 49 -1 -4 S: 20050116 211935.20 2469169160 K:19700101 024639.00,Kh: 52 +2 -2 S: 20050116 211939.10 2469169199 K:19700101 024639.00,Kh: 51 +1 -1 S: 20050116 211944.10 2469169249 K:19700101 024639.00,Kh: 49 -1 -2 2005.01.17 ---------- No ghost echos observed throughout the day. S: 20050117 135153.10 2469764539 K:19700101 024639.00,Kh: 51 +1 +1 S: 20050117 135157.10 2469764579 K:19700101 024639.00,Kh: 49 -1 0 S: 20050117 135201.10 2469764619 K:19700101 024639.00,Kh: 51 +1 +1 S: 20050117 135205.10 2469764659 K:19700101 024639.00,Kh: 52 +2 +3 S: 20050117 135209.10 2469764699 K:19700101 024639.00,Kh: 49 -1 +2 S: 20050117 135214.10 2469764749 K:19700101 024639.00,Kh: 49 -1 +1 S: 20050117 135218.10 2469764789 K:19700101 024639.00,Kh: 49 -1 0 S: 20050117 173126.20 2469896270 K:19700101 024639.00,Kh: 51 +1 +1 S: 20050117 173130.10 2469896309 K:19700101 024639.00,Kh: 48 -2 -1 S: 20050117 173134.10 2469896349 K:19700101 024639.00,Kh: 51 +1 0 S: 20050117 173139.10 2469896399 K:19700101 024639.00,Kh: 49 -1 -1 S: 20050117 173143.10 2469896439 K:19700101 024639.00,Kh: 48 -2 -3 S: 20050117 173238.10 2469896989 K:19700101 024639.00,Kh: 49 -1 -4 S: 20050117 210853.20 2470026740 K:19700101 024639.00,Kh: 51 +1 -3 S: 20050117 210857.20 2470026780 K:19700101 024639.00,Kh: 52 +2 -1 S: 20050117 210907.20 2470026880 K:19700101 024639.00,Kh: 52 +2 +1 S: 20050117 210911.10 2470026919 K:19700101 024639.00,Kh: 49 -1 0 S: 20050117 210915.10 2470026959 K:19700101 024639.00,Kh: 49 -1 -1 2005.01.18 ---------- No tower ghost echos observed throughout the day. S: 20050118 103704.10 2470511649 K:19700101 024639.00,Kh: 51 +1 +1 S: 20050118 103708.10 2470511689 K:19700101 024639.00,Kh: 48 -2 -1 S: 20050118 103713.10 2470511739 K:19700101 024639.00,Kh: 51 +1 0 S: 20050118 103717.10 2470511779 K:19700101 024639.00,Kh: 48 -2 -2 S: 20050118 103721.10 2470511819 K:19700101 024639.00,Kh: 49 -1 -3 S: 20050118 103725.10 2470511859 K:19700101 024639.00,Kh: 51 +1 -2 S: 20050118 103729.10 2470511899 K:19700101 024639.00,Kh: 49 -1 -3 S: 20050118 134738.10 2470625989 K:19700101 024639.00,Kh: 51 +1 -2 S: 20050118 134742.10 2470626029 K:19700101 024639.00,Kh: 49 -1 -3 S: 20050118 134746.10 2470626069 K:19700101 024639.00,Kh: 52 +2 -1 S: 20050118 134750.10 2470626109 K:19700101 024639.00,Kh: 51 +1 0 S: 20050118 134755.10 2470626159 K:19700101 024639.00,Kh: 49 -1 -1 S: 20050118 134759.10 2470626199 K:19700101 024639.00,Kh: 52 +2 +1 S: 20050118 165616.10 2470739169 K:19700101 024639.00,Kh: 51 +1 +2 S: 20050118 165620.10 2470739209 K:19700101 024639.00,Kh: 49 -1 +1 S: 20050118 165624.10 2470739249 K:19700101 024639.00,Kh: 48 -2 -1 S: 20050118 165631.10 2470739319 K:19700101 024639.00,Kh: 49 -1 -2 S: 20050118 165635.10 2470739359 K:19700101 024639.00,Kh: 48 -2 -3 S: 20050118 200311.20 2470851320 K:19700101 024639.00,Kh: 51 +1 -2 S: 20050118 200315.20 2470851360 K:19700101 024639.00,Kh: 49 -1 -3 S: 20050118 200319.20 2470851400 K:19700101 024639.00,Kh: 51 +1 -2 S: 20050118 200324.10 2470851449 K:19700101 024639.00,Kh: 49 -1 -3 S: 20050118 200328.10 2470851489 K:19700101 024639.00,Kh: 49 -1 -4 2005.01.19 ---------- No tower ghost echos observed throughout the day. S: 20050119 143556.10 2471518969 K:19700101 024639.00,Kh: 51 +1 +1 S: 20050119 143600.10 2471519009 K:19700101 024639.00,Kh: 51 +1 +2 S: 20050119 143604.10 2471519049 K:19700101 024639.00,Kh: 49 -1 +1 S: 20050119 143608.10 2471519089 K:19700101 024639.00,Kh: 51 +1 +2 S: 20050119 143617.10 2471519179 K:19700101 024639.00,Kh: 51 +1 +3 S: 20050119 143623.10 2471519239 K:19700101 024639.00,Kh: 49 -1 +2 S: 20050119 143627.10 2471519279 K:19700101 024639.00,Kh: 49 -1 +1 S: 20050119 180557.10 2471644979 K:19700101 024639.00,Kh: 51 +1 +2 S: 20050119 180601.10 2471645019 K:19700101 024639.00,Kh: 51 +1 +3 S: 20050119 180605.10 2471645059 K:19700101 024639.00,Kh: 52 +2 +5 S: 20050119 180609.10 2471645099 K:19700101 024639.00,Kh: 49 -1 -1 S: 20050119 213337.11 2471769579 K:19700101 024639.00,Kh: 49 -1 -1 2005.01.20 ---------- No tower ghost echos observed throughout the day. S: 20050120 103538.10 2472238789 K:19700101 024639.00,Kh: 49 -1 -1 S: 20050120 103542.10 2472238829 K:19700101 024639.00,Kh: 51 +1 0 S: 20050120 103550.10 2472238909 K:19700101 024639.00,Kh: 48 -2 -2 S: 20050120 135404.17 209925512 K:19700101 024639.00,Kh: 51 +1 -1 S: 20050120 135408.19 209925637 K:19700101 024639.00,Kh: 51 +1 0 S: 20050120 135412.16 209925762 K:19700101 024639.00,Kh: 49 -1 -1 S: 20050120 135418.18 209925950 K:19700101 024639.00,Kh: 49 -1 -2 S: 20050120 135423.15 209926105 K:19700101 024639.00,Kh: 51 +1 -1 S: 20050120 135427.17 209926231 K:19700101 024639.00,Kh: 51 +1 0 S: 20050120 135436.17 209926512 K:19700101 024639.00,Kh: 49 -1 -1 S: 20050120 135441.18 209926669 K:19700101 024639.00,Kh: 51 +1 0 S: 20050120 135445.16 209926793 K:19700101 024639.00,Kh: 49 -1 -1 S: 20050120 171805.10 2472480259 K:19700101 024639.00,Kh: 51 +1 0 S: 20050120 171809.10 2472480299 K:19700101 024639.00,Kh: 49 -1 -1 S: 20050120 171814.10 2472480349 K:19700101 024639.00,Kh: 49 -1 -2 S: 20050120 171838.10 2472480589 K:19700101 024639.00,Kh: 49 -1 -3 2005.01.21 ---------- S: 20050121 160658.10 2473301589 K:19700101 024639.00,Kh: 51 +1 +1 S: 20050121 160702.10 2473301629 K:19700101 024639.00,Kh: 49 -1 0 S: 20050121 160706.10 2473301669 K:19700101 024639.00,Kh: 49 -1 -1 S: 20050121 160710.10 2473301709 K:19700101 024639.00,Kh: 48 -2 -3 S: 20050121 160714.10 2473301749 K:19700101 024639.00,Kh: 51 +1 -2 S: 20050121 160722.10 2473301829 K:19700101 024639.00,Kh: 51 +1 -1 S: 20050121 160726.10 2473301869 K:19700101 024639.00,Kh: 51 +1 0 S: 20050121 160734.10 2473301949 K:19700101 024639.00,Kh: 52 +2 +2 Ghost echos observed in 16:15:17 image (first image after the Ka-band system stabilizes). Ka-band processor rebooted at 18:05 according to log. Ghost echos disappear in next image. 2005.01.22 ---------- No tower ghost echos observed throughout the day. S: 20050122 100151.10 2473946519 K:19700101 024639.00,Kh: 51 +1 +1 S: 20050122 100155.10 2473946559 K:19700101 024639.00,Kh: 49 -1 0 S: 20050122 100159.10 2473946599 K:19700101 024639.00,Kh: 52 +2 +2 S: 20050122 100203.10 2473946639 K:19700101 024639.00,Kh: 49 -1 +1 S: 20050122 100207.10 2473946679 K:19700101 024639.00,Kh: 52 +2 +3 S: 20050122 100211.10 2473946719 K:19700101 024639.00,Kh: 49 -1 +2 S: 20050122 100220.10 2473946809 K:19700101 024639.00,Kh: 49 -1 +1 S: 20050122 100224.10 2473946849 K:19700101 024639.00,Kh: 49 -1 0 S: 20050122 100228.10 2473946889 K:19700101 024639.00,Kh: 48 -2 -2 S: 20050122 100236.10 2473946969 K:19700101 024639.00,Kh: 49 -1 -3 S: 20050122 100330.10 2473947509 K:19700101 024639.00,Kh: 49 -1 -4 S: 20050122 131437.10 2474062179 K:19700101 024639.00,Kh: 51 +1 -3 S: 20050122 131441.10 2474062219 K:19700101 024639.00,Kh: 49 -1 -4 S: 20050122 131446.10 2474062269 K:19700101 024639.00,Kh: 49 -1 -5 S: 20050122 131450.10 2474062309 K:19700101 024639.00,Kh: 49 -1 -6 S: 20050122 131454.10 2474062349 K:19700101 024639.00,Kh: 49 -1 -7 S: 20050122 162545.10 2474176859 K:19700101 024639.00,Kh: 51 +1 -6 S: 20050122 162549.10 2474176899 K:19700101 024639.00,Kh: 49 -1 -7 S: 20050122 162553.10 2474176939 K:19700101 024639.00,Kh: 52 +2 -5 S: 20050122 162557.10 2474176979 K:19700101 024639.00,Kh: 49 -1 -6 S: 20050122 162601.10 2474177019 K:19700101 024639.00,Kh: 49 -1 -7 S: 20050122 162606.10 2474177069 K:19700101 024639.00,Kh: 49 -1 -8 S: 20050122 162616.10 2474177169 K:19700101 024639.00,Kh: 49 -1 -9 2005.01.23 ---------- Tower ghost echos present at the start of the day. S: 20050123 103057.10 2474827979 K:19700101 024639.00,Kh: 51 +1 +1 S: 20050123 103101.10 2474828019 K:19700101 024639.00,Kh: 49 -1 0 S: 20050123 103109.10 2474828099 K:19700101 024639.00,Kh: 51 +1 +1 S: 20050123 103118.10 2474828189 K:19700101 024639.00,Kh: 52 +2 +3 S: 20050123 103122.10 2474828229 K:19700101 024639.00,Kh: 51 +1 +4 S: 20050123 103126.10 2474828269 K:19700101 024639.00,Kh: 49 -1 +3 S: 20050123 103130.10 2474828309 K:19700101 024639.00,Kh: 51 +1 +4 S: 20050123 103150.10 2474828509 K:19700101 024639.00,Kh: 49 -1 +3 S: 20050123 133150.10 2474936509 K:19700101 024639.00,Kh: 51 +1 +4 S: 20050123 133202.20 2474936630 K:19700101 024639.00,Kh: 51 +1 +5 S: 20050123 133206.20 2474936670 K:19700101 024639.00,Kh: 52 +2 +7 S: 20050123 163144.10 2475044449 K:19700101 024639.00,Kh: 51 +1 +8 S: 20050123 163148.10 2475044489 K:19700101 024639.00,Kh: 48 -2 +6 S: 20050123 163152.10 2475044529 K:19700101 024639.00,Kh: 49 -1 +5 S: 20050123 163156.10 2475044569 K:19700101 024639.00,Kh: 49 -1 +4 S: 20050123 163200.10 2475044609 K:19700101 024639.00,Kh: 49 -1 +3 S: 20050123 163204.20 2475044650 K:19700101 024639.00,Kh: 49 -1 +2 After this time (16:32), tower ghost echos disappear. Cumulative corrected hits at this point is +2. S: 20050123 193017.40 2475151582 K:19700101 024639.00,Kh: 52 +2 +4 S: 20050123 193021.10 2475151619 K:19700101 024639.00,Kh: 51 +1 +5 S: 20050123 193025.10 2475151659 K:19700101 024639.00,Kh: 51 +1 +6 S: 20050123 193036.10 2475151769 K:19700101 024639.00,Kh: 49 -1 +5 S: 20050123 193040.20 2475151810 K:19700101 024639.00,Kh: 52 +2 +7 Tower ghost echos reappear after this time (19:30), and remain throughout the rest of the day. 2005.01.24 ---------- No ghost echos observed throughout the day. S: 20050124 103047.10 2475691879 K:19700101 024639.00,Kh: 51 +1 +1 S: 20050124 103051.10 2475691919 K:19700101 024639.00,Kh: 48 -2 -1 S: 20050124 103055.10 2475691959 K:19700101 024639.00,Kh: 51 +1 0 S: 20050124 103059.10 2475691999 K:19700101 024639.00,Kh: 48 -2 -2 S: 20050124 103103.10 2475692039 K:19700101 024639.00,Kh: 49 -1 -3 S: 20050124 103107.10 2475692079 K:19700101 024639.00,Kh: 49 -1 -4 S: 20050124 103111.10 2475692119 K:19700101 024639.00,Kh: 49 -1 -5 S: 20050124 103115.10 2475692159 K:19700101 024639.00,Kh: 49 -1 -6 S: 20050124 103119.10 2475692199 K:19700101 024639.00,Kh: 52 +2 -4 S: 20050124 103123.10 2475692239 K:19700101 024639.00,Kh: 52 +2 -2 S: 20050124 103130.10 2475692309 K:19700101 024639.00,Kh: 49 -1 -3 S: 20050124 103139.10 2475692399 K:19700101 024639.00,Kh: 49 -1 -4 S: 20050124 134404.10 2475807849 K:19700101 024639.00,Kh: 51 +1 -3 S: 20050124 134408.10 2475807889 K:19700101 024639.00,Kh: 51 +1 -2 S: 20050124 134412.10 2475807929 K:19700101 024639.00,Kh: 49 -1 -3 S: 20050124 134416.10 2475807969 K:19700101 024639.00,Kh: 49 -1 -4 S: 20050124 134420.20 2475808010 K:19700101 024639.00,Kh: 49 -1 -5 S: 20050124 134427.10 2475808079 K:19700101 024639.00,Kh: 49 -1 -6 S: 20050124 134431.10 2475808119 K:19700101 024639.00,Kh: 49 -1 -7 S: 20050124 165534.10 2475922749 K:19700101 024639.00,Kh: 51 +1 -6 S: 20050124 165538.10 2475922789 K:19700101 024639.00,Kh: 48 -2 -8 S: 20050124 165543.10 2475922839 K:19700101 024639.00,Kh: 51 +1 -7 S: 20050124 165547.10 2475922879 K:19700101 024639.00,Kh: 49 -1 -8 S: 20050124 165551.10 2475922919 K:19700101 024639.00,Kh: 49 -1 -9 S: 20050124 165555.10 2475922959 K:19700101 024639.00,Kh: 49 -1 -10 S: 20050124 185617.10 2475995179 K:19700101 024639.00,Kh: 51 +1 -9 S: 20050124 185621.10 2475995219 K:19700101 024639.00,Kh: 51 +1 -8 S: 20050124 185626.10 2475995269 K:19700101 024639.00,Kh: 49 -1 -9 S: 20050124 185630.10 2475995309 K:19700101 024639.00,Kh: 51 +1 -8 S: 20050124 185634.10 2475995349 K:19700101 024639.00,Kh: 51 +1 -7 S: 20050124 185638.10 2475995389 K:19700101 024639.00,Kh: 49 -1 -8 S: 20050124 195217.10 2476028779 K:19700101 024639.00,Kh: 51 +1 -7 S: 20050124 195221.10 2476028819 K:19700101 024639.00,Kh: 52 +2 -6 S: 20050124 195225.10 2476028859 K:19700101 024639.00,Kh: 49 -1 -7 S: 20050124 195229.10 2476028899 K:19700101 024639.00,Kh: 52 +2 -5 S: 20050124 195233.10 2476028939 K:19700101 024639.00,Kh: 49 -1 -6 S: 20050124 195237.10 2476028979 K:19700101 024639.00,Kh: 49 -1 -7 S: 20050124 195242.10 2476029029 K:19700101 024639.00,Kh: 49 -1 -8 S: 20050124 195255.10 2476029159 K:19700101 024639.00,Kh: 49 -1 -9 S: 20050124 195301.10 2476029219 K:19700101 024639.00,Kh: 49 -1 -10 S: 20050124 195316.10 2476029369 K:19700101 024639.00,Kh: 49 -1 -11 S: 20050124 200742.10 2476038029 K:19700101 024639.00,Kh: 51 +1 -10 S: 20050124 200746.10 2476038069 K:19700101 024639.00,Kh: 48 -2 -12 S: 20050124 200750.10 2476038109 K:19700101 024639.00,Kh: 49 -1 -13 S: 20050124 200756.10 2476038169 K:19700101 024639.00,Kh: 49 -1 -14 S: 20050124 200800.10 2476038209 K:19700101 024639.00,Kh: 52 +2 -12 S: 20050124 200806.10 2476038269 K:19700101 024639.00,Kh: 51 +1 -11 S: 20050124 200814.10 2476038349 K:19700101 024639.00,Kh: 49 -1 -12 S: 20050124 200818.10 2476038389 K:19700101 024639.00,Kh: 48 -2 -14 S: 20050124 210303.10 2476071239 K:19700101 024639.00,Kh: 51 +1 -13 S: 20050124 210308.10 2476071289 K:19700101 024639.00,Kh: 49 -1 -14 S: 20050124 210312.10 2476071329 K:19700101 024639.00,Kh: 52 +2 -12 S: 20050124 210318.10 2476071389 K:19700101 024639.00,Kh: 49 -1 -13 S: 20050124 210324.10 2476071449 K:19700101 024639.00,Kh: 49 -1 -14 S: 20050124 210328.10 2476071489 K:19700101 024639.00,Kh: 51 +1 -13 S: 20050124 210332.10 2476071529 K:19700101 024639.00,Kh: 51 +1 -12 S: 20050124 210336.10 2476071569 K:19700101 024639.00,Kh: 49 -1 -11 S: 20050124 210340.10 2476071609 K:19700101 024639.00,Kh: 48 -2 -13 S: 20050124 214750.10 2476098109 K:19700101 024639.00,Kh: 51 +1 -12 S: 20050124 214800.10 2476098209 K:19700101 024639.00,Kh: 51 +1 -11 S: 20050124 214810.10 2476098309 K:19700101 024639.00,Kh: 49 -1 -12 S: 20050124 214818.20 2476098390 K:19700101 024639.00,Kh: 49 -1 -13 S: 20050124 214822.10 2476098429 K:19700101 024639.00,Kh: 49 -1 -14 S: 20050124 214826.10 2476098469 K:19700101 024639.00,Kh: 49 -1 -15 S: 20050124 214834.10 2476098549 K:19700101 024639.00,Kh: 52 +2 -13 S: 20050124 214849.10 2476098699 K:19700101 024639.00,Kh: 49 -1 -14 Conclusions ----------- During January, the only periods of ghost echos observed are 12/30/2004 13:30:56 - 17:24:05 01/07/2005 13:58:51 - end of day 01/11/2005 start of day - 14:50 01/21/2005 16:15:17 - 18:05 The cumulative corrected hits should be a reliable way of determining when ghost echos occur. However, this value is not recorded in the data files and is therefore not known. The values presented here are guesses, since the actual value depends on processor reboots which may or may not have been recorded in the log. However, for the most part, according to this analysis, ghost echos appear when the cumulative corrected hit count is greater than +2, and disappear when it is < +2.