January 1999

 

Table 39.1: GBES Tracking Pass Summary for January 1999

		no	% lost			Attended	Unattended
pass	% good	op.	total	hardware	software	% recovered	% recoverable	exp	notes
9901012113	94.73	X*	5						HALCA signal 8 minutes late, Unscheduled HALCA Ku-antenna wire wrap? Phase glitch
9901030058	99.85
9901031712	81.43		18						HALCA signal 4 minutes late
9901040203	99.79								phase glitch
9901041838	47.66		52						HALCA signal 12 minutes late
9901052034	99.87
9901062233	99.82								phase glitch
9901080112	99.85
9901090233	93.70		6			94			major snow storm; intial pointing error
9901102205	99.37	X
9901112115	99.49							V071b2	HALCA Ku antenna wire wrap
9901130124	99.71								phase glitch
9901131726	5.42		94		94				frequency predictions not updated properly
9901141855	99.58
9901152150	99.67
9901162241	99.81								phase glitch
9901172241	99.90								HALCA Ku antenna wire wrap
9901181731	92.05								HALCA Ku antenna wire wrap
9901191846	91.00								HALCA Ku antenna wire wrap
9901201959	99.87
9901212125	99.48							W015b1	phase glitches
9901221610	93.86		6						HALCA signal 1 minute late
9901230103	99.75
9901240455	98.85	X							phase glitches?
9901241907	99.43
9901252053	99.82								phase glitches
9901262314	99.83								phase glitche
9901271619	93.32								HALCA Ku antenna wire wrap
9901280204	99.85
9901281745	99.64
9901290445	92.67		7					W012l	low power levels on link last 5 min of pass
9901291954	99.62
9901302020	99.17								phase glitch
9901312325	99.90

There was a total of 34 tracking passes in January of 1999 with 3 of these being unattended tracking passes. Of the 31 attended tracking passes 28 collected the maximum amount of valid data possible. Of the 3 unattended tracking passes 3 collected the maximum amount of good data. There were 4 tracking passes that lost data due to problems on HALCA pointing to the GBES late.

Of the 3 recording passes, all 3 collected the maximum amount of good data. One recording pass did lose 7% due to orbit prediction problems.

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

$\bullet$ 28 of 31 attended passes had max good data.

$\bullet$ Operators helped increase amount of good data in 1 of 3 ``bad'' attended passes.

$\bullet$ 3 of 3 unattended passes had max good data.

$\bullet$ A total of 0.86 tracking passes lost data due to problems with SRT and orbit predictions.

$\bullet$ A total of 0.94 tracking passes lost data due to software problems.

$\bullet$ A total of 0.06 tracking passes lost data due to incliment weather.

$\bullet$ 3 of 3 recording passes were completely successful.