File swan_sheet3.txt -- Last modified Fri Aug 25 10:40:25 1995


                   COMMISSIONING PHASE BLOCK SHEET

1. INSTRUMENT AND BLOCK NUMBER: SWAN, Block 3

2. BLOCK IDENTIFICATION: SWAN Calibrations

3. PURPOSE: Measure SWAN Performance

4. SUB-BLOCKS: (see Note 1)
   NR.   IDENTIFICATION
   3.1   First Sky Map
   3.2   Star Calibration
   3.3   Mechanical Offset Measurement
   3.4   Measurement of Mirror Polarizaion
   3.5   H-Cell Measurement +/- Z direction
   3.6   H-Cell Measurement Antisolar Direction
   3.7   H-Cell Measurement on Sun illuminated S/C
   3.8   Test of Sunshade Efficiency 

5. SUB-BLOCKS TABLE: (see Note 2)
   NR. - DURATION - PREVIOUS - COMMANDING - TELEMETRY - POINTING
   3.1    1:00 (1)   Nom.      NRT-d, D (2)    M         Nom. 
   3.2    6:00       Nom.      NRT-d/s         M         Nom.
   3.3    1:00       Nom.      NRT-d           M         Nom.
   3.4    1:00       Nom.      NRT-d           M         Nom.
   3.5    1:00       Nom.      NRT-d           M         Nom.
   3.6    1:00       Nom.      NRT-d           M         Nom.
   3.7    1:00       Nom.      NRT-d           M         Nom.
   3.8    1:00       Nom.      NRT-d           M         Nom.

   (1) Continuation for 12:00 after initial 1:00 verification. 
       To be continued during non-contact time (? Check if allowed
       this early in mission)
    2) Commands loaded through delayed command channel during
       FOT reserved time; can also be sent as NRT commands from IWS

6. SCHEDULING REQUIREMENTS: (see Note 3)
   Start Block 3 after SVM checkout. Subblocks at least at
   subsequent days (more spacing allowed)

7. SPECIAL REQUIREMENTS: (see Note 4)
   3.8:  Pointing stability of S/C better than 0.5 deg towards 
         center of sun

8. SUCCESS CRITERIA AND/OR EXPECTED OUTPUT:
   SWAN Performance within Specifications

9. RELEVANT PROCEDURES
   None

10. CROSS-REFERENCE TO TEST SHEETS: (list identifiers for test sheets)
    SWAN 3 - 10, to be modified compared to issue 1/1 from 21/09/94

11. RELEVANT SECTION OF TIMELINE (backpage)

BLOCK 3: SWAN CALIBRATIONS

Block 3.1: First Sky Map (50%)
a. 5 & 00:00
b. 4 & 12:00
c. no limit
d. 12:00	(automatic after initial verification)
e. N/A
f. Initial NRT-commanding only, 6 OBDH block TCs with about 10 words each
g. Block 1.3 was successful, no thruster activation planned for 12 hours,
	at least 15 min RT-contact available
h. 1

Block 3.2: Star Calibration
a. 6 & 00:00
b. 5 & 00:00	(earliest 12 hours after completion of block 3.1)
c. no limit
d. 06:00
e. not until all initial TCs are sent
f. Initial NRT-commanding: 16 OBDH block TCs with about 10 words each
	possibly additional TCs during the calibration
g. Block 1.3 was successful, no thruster activation planned for 6 hours,
	at least 6 hours RT-contact available
h. 1
Note: the command parameters (mainly star positions) have to be calculated
	from the telemetry results of block 3.1 and uplinked to the instrument
	at least 15 minutes before the calibration should start.
	During the calibration, directional parameters may have to be
	corrected on-line via NRT commanding in case the selected stars are
	not found in the instrument coordinate range as expected.
	The commanding activity also in this case would be less then
	10 TCs per hour with about 10 words each.

Block 3.3: Mechanical Offset Measurement
a. 7 & 00:00
b. 5 & 12:00	(earliest 12 hours after completion of block 3.2)
c. no limit
d. 01:00
e. any time
f. Initial NRT-commanding: 6 OBDH block TCs with about 10 words each
	possibly additional TCs during the measurement
g. Block 3.1 was successful, no thruster activation planned for 1 hour,
	at least 1 hour RT-contact available
h. 1

----------------------------------------------------------------------------
COORDINATED MEASUREMENT: SEE MDI PLAN

Block ??: Measurement of SWAN Induced Jitter
a. 8 & 00:00
b. 5 & 12:00
c. 19 & 00:00
d. 01:00	(time depends on other instruments, too. See strawman plan)
e. any time
f. Initial NRT-commanding: 6 OBDH block TCs with about 10 words each
	possibly additional TCs during the measurement
g. None
h. 3
-----------------------------------------------------------------------------

Block 3.4: Measurement of Mirror Polarization
a. Time of S/C roll
b. 5 & 12:00
c. no limit
d. 01:00
e. any time
f. Initial NRT-commanding: 6 OBDH block TCs with about 10 words each
	possibly additional TCs during the measurement
g. None
h. 2

Block 3.5: H-Cell Measurement +/- Z direction
a. 10 & 00:00
b.  6 & 00:00
c. no limit
d. 01:00
e. any time
f. Initial NRT-commanding: 6 OBDH block TCs with about 10 words each
	possibly additional TCs during the measurement
g. None
h. 2

Block 3.6: H-Cell Measurement Antisolar Direction
a. 11 & 00:00
b.  6 & 00:00
c. no limit
d. 01:00
e. any time
f. Initial NRT-commanding: 6 OBDH block TCs with about 10 words each
	possibly additional TCs during the measurement
g. None
h. 2

Block 3.7: H-Cell Measurement on Sun illuminated S/C
a. 12 & 00:00
b. 12 & 00:00
c. no limit
d. 01:00
e. any time
f. Initial NRT-commanding: 6 OBDH block TCs with about 10 words each
	possibly additional TCs during the measurement
	RT-contact during this measurement
g. None
h. 3

Block 3.8: Test of Sunshade Efficiency
a. 13 & 00:00
b. 12 & 00:00
c. no limit
d. 01:00
e. any time
f. Initial NRT-commanding: 6 OBDH block TCs with about 10 words each
	possibly additional TCs during the measurement
	RT-contact during this measurement is very important
g. Pointing stability of S/C better than 0.5 deg towards center of sun
h. 1