Gemini/apollo real-time telemetry system.
Gemini and Apollo data transmission procedures and equipment for linking worldwide tracking sites and Cape Kennedy with Houston mission control center
MANNED SPACE FLIGHT↗
SEARCH · Engineering Papers
Results for “timing system”
Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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Predictor Aided Tracking in a System with Time Delay - Performance Involving Flat Surface, Roll, and Pitch Conditions
Predictor aided human tracking performance with time delay control under flat surface, roll, pitch, and roll and pitch conditions
REMOTE CONTROL↗
Stability of feedback systems involving time delays and a time varying nonlinearity
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Walker, J. A.↗
A world-wide lunar radar time synchronization system
Synchronizing clocks at remote locations with master clock by radar reflected from moon for Deep Space Network
Baumgartner, W. S.↗
A world-wide lunar radar time synchronization system
Clock synchronization system using lunar radar reflections for Deep Space Network needs, discussing remote clock receiver and antenna
Baumgartner, W. S.↗
Design of finite settling time discrete systems
Finite settling response for single input/output feedback control system obtained by dual rate sampled data control algorithm
Gatlin, J. A.↗
Empirical Bayes state estimation in discrete time linear systems
Linear dynamic systems state estimation, using empirical Bayes decision theory to develop filter set
Kamat, S. J.↗
Spectral factorization in time-varying systems having periodic coefficients and its application to navigation of solar electric interplanetary missions
Low thrust interplanetary spacecraft tracking, using spectral factorization for Kalman filtering equations steady state solution
Nishimura, T.↗
Compensator design for low-sensitivity linear time-invariant systems (COMPDES)
Digital computer program written in FORTRAN 4 has capability of synthesizing low order compensators to stabilize dynamical system in presence of parameter variations. Design scheme is accomplished by means of sensitivity function which is minimized with respect to eigenvalues.
Willner, L.↗
Recent results concerning a graphical test for checking the stability of a linear time-invariant system.
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Callier, F. M.↗
A contribution to the controllability of time-lag systems.
Consideration of a property of 'complete controllability' which is a particular case of complete controllability with respect to an arbitrary function. The latter concept has been studied by Popov (1970), who gave a necessary and sufficient condition of controllability in algebraic form. It is shown that the necessary condition of complete controllability with respect to an arbitrary function is also a necessary condition of the particular property of complete controllability under certain given conditions.
Choudhury, A. K.↗
Signal processing in a randomly time varying system.
Stochastic operators are applied to an analysis of some deterministic systems of signal transformation. The distribution of a random process at the output of a system is given through its distribution at the input and through a stochastic Green's function. A two-point correlation function is derived to obtain a solution to differential equations which contain coefficients, boundary conditions, or right-hand terms representing random processes.
Adomian, G.↗
Software techniques for a distributed real-time processing system
The paper describes software techniques developed for the Unified Data System (UDS), a distributed processor network for control and data handling onboard a planetary spacecraft. These techniques include a structured language for specifying the programs contained in each module, and a small executive program in each module which performs scheduling and implements the module task.
Lesh, F.↗
Logos-2: A large scale, real-time computer system for multiple-instrument mass spectrometry, including low and high resolution, GC-MS, and spectrum management applications
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Burlingame, A. L.↗
An algorithm for obtaining the minimal realization of a linear time-invariant system and determining if a system is stabilizable-detectable
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Davison, E. J.↗
An algorithm for obtaining the minimal realization of a linear time-invariant system and determining if a system is stabilizable-detectable
A definition of centralized fixed modes of a system, which is an adoption of the definition of fixed modes for a decentralized system is made. It is shown that the centralized fixed modes of a system can be easily and efficiently calculated in terms of the eigenvalues of the system, and that the calculation of such fixed modes enables one to determine, in a numerically efficient way, whether a system is controllable, observable, stabilizable, or detectable. An efficient algorithm for reducing a system to minimal realization form is then given. The algorithms have been effectively used on systems of order up to 100.
Davison, E. J.↗
Real-time operating system for selected Intel processors
The rationale for system development is given along with reasons for not using vendor supplied operating systems. Although many system design and performance goals were dictated by problems with vendor supplied systems, other goals surfaced as a result of a design for a custom system able to span multiple projects. System development and management problems and areas that required redesign or major code changes for system implementation are examined as well as the relative successes of the initial projects. A generic description of the actual project is provided and the ongoing support requirements and future plans are discussed.
Pool, W. R.↗
Comparison of analytical predictions of longitudinal short period pilot-induced oscillations with results from a simulation study of the space shuttle orbiter
An analytical analysis of conditions producing pilot induced oscillations (PIO's) was made for the space shuttle orbiter in a landing approach configuration for the task of milling the elevation angle of the line of sight to a target vehicle. The analysis yielded a value of PIO frequency and a value for the amount of total system time delay (pilot + control system) that can be tolerated before instability results. Calculations were performed showing the effect of varying the range to the target and of varying the handling qualities of the orbiter vehicle. Analytical predictions were compared with simulation results obtained using a visual motion simulator.
Riley, D. R.↗