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Communications and Tracking System (1032 words) |
 | The Motorola built digital command subsystem consists of a receiver-decoder and associated relay units which permit spacecraft utilization of ground commands. |
| The digital command system receives and decodes command transmissions from the global network of ground stations and transforms them into a digital format. |
| Digital commands are categorized as either "real-time commands" or "stored program commands." Real-time commands operate DCS relays that control equipment input power or energize relays in the spacecraft electrical system to control equipment usage. |
| Gemini Inertial Guidance System (1214 words) |
| The major change in the flight control system from Titan II missile to Gemini launch vehicle was substitution of the General Electric Mod IIIG radio guidance system (RGS) and Titan I three-axis reference system for the Titan II inertial guidance system. |
| Commands were of two types: real-time commands to control various spacecraft functions and stored program commands to provide data updating the time reference system and the digital computer. |
| The digital computer was the heart of the spacecraft's guidance and control system; supplementary equipment consisted of the incremental velocity indicator (which visually displayed changes in spacecraft velocity), the manual data insertion unit (for inserting data into, and displaying readouts from, the computer), and the auxiliary computer power unit (to maintain stable computer input voltages). |
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