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MIT Lincoln Laboratory is carrying out a program to upgrade the existing Haystack radar by adding a W-band (96 GHz) radar capability. The existing X-band radar (10 GHz) will remain intact and the resulting radar will be capable of either simultaneous dual-band or single-band operation. This document describes the performance requirements of the control system for the HUSIR antenna. A new higher precision antenna is being installed, allowing the antenna to be used efficiently at W-Band. At W-Band, the system will have a very narrow beam that needs to be accurately pointed by a new control system while operating at higher velocities than the old hydraulic system. This document describes the design of the control system as it is to be implemented, but this document alone isn't enough to completely define the control system design. A large number of drawings go along with this document (and will be referenced throughout this document), as well as several Interface Control Documents (ICDs). These ICDs will define the data that is transferred between the radar or astronomy computer and the antenna control unit (ACU), between the ACU and the maintenance computers, and between the ACU and the Programmable Logic Controller (PLC) system. The ICDs will be referenced, where appropriate., Prepared in cooperation with Maglathlin Consulting Services, LLC.