SOHO Transfer Trajectory Phase - SVM

SVM EARLY CHECKOUT

1. System level checkout

   The following system level checkout activities will take place in the very early TTP (test sheet numbers are shown in brackets):

   • Power Budget Verification (S1) and
   • RF Budget with HGA, for MR only (S3)

2. Subsystem level checkout

   The early orbit checkout activities at subsystem level are the following:

   • AOCS health check (SSA11)
   • Dump of the programmable part of the S/W packet (SSD1)
   • Macro command function test (SSD4) (TBC)
   • Command list test (SSD5) (TBC)
   • DHSS health check (SSD9)
   • SSR health check (SSD9bis)
   • ANTS health check (SSR3)
   • Uplink performance verification (SSR5)
   • EPSS health check (SSE1)
   • PTCS thermal check (SSP1)
   • Thermal prediction check (SSS1)

SVM COMMISSIONING

System level commissioning

• Power budget verification, after wheels offloading (S1)
• RF budget with LGA (S2)
• RF budget with HGA (S3)
• Fuel budget verification (S4)
• External disturbing torques calibration
• Verification of absolute pointing req. (S6)
• Verification of medium term pointing req. (S7)
• Verification of pointing stab. outside exp. motion (S8)
• Verification of pointing stab. during exp. motion (S9)

Subsystem level commissioning

• Verification of AOCS telemetry types 3.1 and 3.3 (SSA1)
• Drift and scale factor of gyros (SSA2)
• SSU background calib. and star mag accuracy check (SSA3)
• Correlation of SSU and FPSS data along pitch axis (SSA4)
• Calibration of SAS 1 w.r.t. FPSS (SSA5)
• FPSS offsetting (SSA6)
• Comparison between FPSS A and B (SSA7)
• Comparison between SSU A and SSU B (SSA8)
• RW4 functional test (SSA9)
• Individual thruster efficiency calibration (SSA10)
• AOCS health check (SSA11)

• Dump of the programmable part of the S/W packet (SSD1)
• Min/Max monitoring function test (SSD2)
• Standard monitoring function test (SSD3)
• Macro-command function test (SSD4)
• Command list test (SSD5)
• Test of telemetry submodes 1 to 4 (SSD6)
• Transition from SSR to TR1 (SSD7)
• Use of ASW2 for TC coding (SSD8)
• DHSS health check (SSD9)
• OBT stability (SSD10)
• Bit error rate of SSR and TR (SSD11)
• Single event upset monitoring (SSD12)

• HGA pointing (SSR1)
• HGA depointing degradation (SSR2)
• ANTS health check (SSR3)
• Modulation index optimization (SSR4)
• Uplink performance check (SSR5)

• EPSS health check (SSE1)

• PTCS thermal check (SSP1)
• PTCS calibration (fine tuned areas) (SSP2)
• PTCS calibration (upper panels) (SSP3)

• Thermal prediction check (SSS1)
• Thermal transient on tape recorder (SSS2)
• Thermal transient at momentum dumping (SSS3)
• Thermal transient due to APM (SSS4)