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February 1998


 
Table 17.1: GBES Tracking Pass Summary for February 1998
      no % lost Attended Unattended      
pass % good op. total hardware software % recovered % recoverable exp notes
9802011505 99.93 X                     
9802021846 92.06 X   7 7             TWT module put in system late
9802031004 95.21 X   4          4?    UNKNOWN CAUSE
9802032122 99.18                        
9802041123 0.00 X 100          100?    Snow - op not inform not here
9802051311 99.18 X                     
9802061539 99.90                        
9802071957 99.28                     V140b3   
9802081020 0.00 X 100                HALCA IN SAFEHOLD-no call-out
9802091140 0.00    100                HALCA IN SAFEHOLD
9802101331 0.00    100                HALCA IN SAFEHOLD
9802151515 98.93    1                SRT off 5-15 min from SAFEHOLD
9802181051 0.00 X 100                HALCA in SAFEHOLD
9802201437 93.03 X 3 3             'bad' orb pred; TWT glitches
9802211946 19.19    80             VS11f 'bad' srt times
9802241617 97.17      2                snow, pointing
9802251502 98.45 X                   HALCA Ku antenna unwrap
9802281329 98.76 * 1       100   GIL, ant. in 2nd limit (Az>90)

There was a total of 17 tracking passes in February of 1998 with 10 of these being unattended tracking passes. Of the 7 attended tracking passes 7 collected the maximum amount of valid data possible. Of the unattended tracking passes 5 of 10 obtained the maximum amount of valid data. The presence of an operator at the ``bad'' unattended tracking passes would have increased the amount of good data in 1-3 of 5 passes. There were 4 tracking passes where there were problems with HALCA and 3 tracking passes where there were problems with the SRT files or orbit prediction files.

Inclement weather caused the complete loss of one tracking pass. The observatory was on emergency shutdown and the operator did not notify GIL or AHM that he was not attending the tracking pass. The tracking pass could have been performed due to the low elevation of HALCA during the whole tracking pass without any danger to the safety of the NRAO OVLBI earth station.

Of the 2 recording passes, 2 collected the maximum amount of good data. One recording pass was affected by the SRT file not reflecting the current orbital parameters after HALCA came out of a safehold mode.



$\bullet$ 7 of 7 attended passes had max good data.

$\bullet$ Operators helped increase amount of good data in 0 of 0 ``bad'' attended passes.

$\bullet$ 5 of 10 unattended passes had max good data.

$\bullet$ Operators would have increased amount of good data in 1-3 of 5 ``bad'' unattended passes.

$\bullet$ A total of 0.03 tracking passes lost data due to software problems.

$\bullet$ A total of 0.07 tracking passes lost data due to hardware problems.

$\bullet$ A total of 4.00 tracking passes lost data due to problems with HALCA.

$\bullet$ SRT and orbit prediction file problems resulted in the loss of 0.84 tracking passes.

$\bullet$ 2 of 2 recording passes were completely successful.

$\bullet$ A total of 0.00 recording passes lost data.


next up previous
Next: March 1998 Up: No Title Previous: January 1998
Toney Minter
2000-04-09