The Relay spacecraft
Structure, power, communications, telemetry, tracking, and command for Relay I spacecraft
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Structure, power, communications, telemetry, tracking, and command for Relay I spacecraft
Geodetic satellite command, telemetry, clock, and memory subsystems reliability evaluation
Space flight operations plan for Mariner Mars flyby mission
Satellite operational reliability by assigning command functions to relay matrix positions of command subsystem
Radio, telemetry and command subsystems of Mariner Mars 1964 telecommunications system
A discription of the logic design for the digital control equipment is followed by further descriptions of items of particular interest. The means of applying off-sets to the demanded aerial position for over-coming possible inaccuracy of the predicted orbit; and to demand accuratly determined velocities manually; means of conversion from pure binary form to provide displays in terms of angles, and the derivation of analogue voltages for the for the servo-amplifiers are discussed in detail. A critical analysis of the equipment in the light of operational experience concludes the paper.
Design of command and data handling system for orbiting astronomical observatory, and scientific experiments for OAO spacecraft
Probability distribution of time to first loss of lock investigated by second order phase-locked loop - spacecraft telemetry and command
Diffusion of Freon and helium trace gases for detection of leaks in aerospace systems
Apollo reaction control systems, describing command module, service module, lunar module, engine qualifications, etc
Exhaust plume characteristics for R4D engine used by CSM reaction control system
Engineering drawing lists for solid state sequencer system in command module and service module jettison controller
Logic circuitry, and environmental and acceptance tests for solid state sequencer system in command module and service module jettison controller
Wiring lists for solid state sequencer system in command module and service module jettison controller
Design, development, and operation of communications system for command and control of unmanned spacecraft during exploration of deep space
The Agena space tug design was based on the requirements of representative reference missions, the use of existing hardware, and the experience gained from more than 300 Agena flights. To provide a convenient reference for understanding the Agena tug design selection or for evaluating alternative concepts, this catalog of existing flight equipment was prepared. Equipment descriptions are grouped by Agena subsystem, as follows: spaceframe; propulsion; electrical; guidance and flight controls; and telemetry, tracking, and command. These systems, most of which have been flight qualified on prior Agena programs, permit specialized mission requirements to be satisfied without sacrificing cost or reliability.
A comparison of the results from a fixed-base, six-degree-of -freedom simulator and a moving-base, three-degree-of-freedom simulator was made for a close-in, EVA-type maneuvering task in which visual cues of a target spacecraft were used for guidance. The maneuvering unit (the foot-controlled maneuvering unit of Skylab Experiment T020) employed an on-off acceleration command control system operated entirely by the feet. Maneuvers by two test subjects were made for the fixed-base simulator in six and three degrees of freedom and for the moving-base simulator in uncontrolled and controlled, EVA-type visual cue conditions. Comparisons of pilot ratings and 13 different quantitative parameters from the two simulators are made. Different results were obtained from the two simulators, and the effects of limited degrees of freedom and uncontrolled visual cues are discussed.
An overview of the NASA Sounding Rocket Program is presented. The program has launched a total of 1912 rockets representing 30 types of vehicle configurations. Payloads have been primarily directed to the disciplines of magnetodynamics, solar physics, stellar and planetary astronomy and meteorology. The vehicles, launching sites, and launching techniques used in the program are described, and the pointing control systems and command links developed in the course of the program are discussed.