Design and Analysis of Control Laws for the Vertical Seeking Seat and the MICRAD (Microwave Radiometric) Attitude Reference System
SYSTEMS ANALYSIS AND CONTROL RIDGECREST CA
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The Maximum Performance Ejection Seat MPES or Vertical Seeking Seat VSS escape system requires a vertical reference to provide commands for the control system. Previous tests of the MPESVSS system performed using a strap- down vertical reference system which was initialized at the planned launch attitude. Although this attitude hand-off is satisfactory for initial tests, the operational system should use an autonomous reference system such as the Microwave Radiometric MICRAD Attitude Reference System MARS. One problem with using MARS to provide error signals to the VSS control system is that the MARS outputs vary significantly depending on whether the local earths surface is land or water. This variation changes the control system gain resulting in degraded performance. As a result, efforts were initiated to develop alternatives andor improvements to control laws studied previously at the Naval Weapons Center. An alternate control law was developed and evaluated using a digital simulation. Results indicated that this control law provided good performance and adequately compensated for variations in the MARS outputs.