Both memories are accessed by the single active processor in each system. ![]() For example, "expended" algorithms, such as the deployment sequence executed shortly after separation from the booster, need not be maintained 5. Full bit-for-bit redundancy is not maintained in the dual memories. Although both CCSs are always powered, rarely are both Flight Data Systems running, and both attitude control computers are never turned on at the same time. JPL's project staff believed that equipment would last longer if unpowered 4. One concept from the STAR computer proposed for the TOPS, applicable to Voyager, is dormancy. Attitude control and articulation of the scan platform are accomplished with the third computer system. ![]() Telemetry data formatting and transmission handled by the Flight Data System are done on Voyager with the help of a custom-built computer. The first, the CCS, is nearly identical to that flown on Viking, performing sequencing and spacecraft health functions along with new ones necessitated by the addition of the other computers. Voyager employs three dual-redundant computer systems per spacecraft. After visiting Jupiter and Saturn, Voyager 1 is to travel out of the plane of the planetary orbits and leave the solar system. However, favorable gravity assists and hardware longevity made it possible to plan for a Uranus flyby by the Voyager 2 spacecraft and, potentially, a Neptune encounter. Although TOPS' original mission was to conduct the Grand Tour of the four gas giant planets, Voyager was limited to flybys of the innermost two, Jupiter and Saturn. ![]() It was given the name Voyager in the mid-1970s. Chapter Six - Distributed Computing On Board Voyager and Galileo - Voyager - The flying computer center After the cancellation of the Thermoelectric Outer Planet Spacecraft (TOPS) project as such, JPL proposed, and NASA funded, a project called Mariner-Jupiter-Saturn 1977. Computers in Spaceflight: The NASA Experience
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