February 1999

 

Table 41.1: GBES Tracking Pass Summary for February 1999

		no	% lost			Attended	Unattended
pass	% good	op.	total	hardware	software	% recovered	% recoverable	exp	notes
9902020227	99.86
9902021759	95.28		4						HALCA signal 1m15s late
9902031924	99.81
9902042037	90.10		9		9	90		V008b	Pointing task stopped; no recording data lost
9902052349	78.31		21	21		5			ACU didn't function properly at end of pass
9902070203	99.89							V080i
9902071813	95.35	X	4						HALCA signal 1 minute late
9902081931	98.78		1						HALCA not cmd to point at GB until 2 min into pass
9902092049	99.30								HALCA not cmd to point at GB until 3 min into pass
9902102324	99.01								phase glitch, dropout
9902110121	99.84
9902121824	93.88		4						HALCA not cmd to point at GB until 3 min into pass, dropout
9902131942	97.32		2						HALCA not cmd to point at GB until 3 min into pass
9902142257	99.86							V003c	phase glitch
9902152257	99.87							V085c2	phase glitches
9902181950	98.23		1						HALCA not cmd to point at GB until 3 min into pass
9902192309	45.37		54		54	45			pointing task stopped
9902210103	99.82							VT741	phase glitch
9902231957	0.00		100						HALCA DHU failure
9902232249	0.00		100						HALCA DHU failure
9902242141	0.00		100						HALCA DHU failure
9902260018	0.00		100						HALCA DHU failure

There was a total of 22 tracking passes in February of 1999 with 1 of these being an unattended tracking pass. Of the 21 attended tracking passes 18 collected the maximum amount of valid data possible. The unattended tracking pass collected the maximum amount of good data. There were 7 tracking passes that lost data due to problems on HALCA pointing to the GBES late. Four tracking passes failed completely due to problems with HALCA.

Of the 5 recording passes, all 4 collected the maximum amount of good data and no recording data was lost.

A communications problem between the station computer and the TWT module firmware resulted in most of the data from one tracking pass being corrupted.

$\bullet$ 18 of 21 attended passes had max good data.

$\bullet$ Operators helped increase amount of good data in 3 of 3 ``bad'' attended passes.

$\bullet$ 1 of 1 unattended passes had max good data.

$\bullet$ A total of 0.16 tracking passes lost data due to problems with SRT and orbit predictions.

$\bullet$ A total of 0.63 tracking passes lost data due to software problems.

$\bullet$ A total of 0.21 tracking passes lost data due to hardware problems.

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

$\bullet$ 5 of 5 recording passes were completely successful (all recording data collected successfully).