TORQUE MODULATION AND MODULATION ERROR DETECTION CONCEPTS IN MODERN GUIDANCE INSTRUMENTS
Space science - torque modulation and instrument error detection concepts for gyroscopes and accelerometers
INSTRUMENT ERROR↗
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Results for “module”
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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Dynamic simulation of lunar module docking with Apollo command module in lunar orbit
Pilot controlled simulation of lunar model docking with Apollo command module in lunar orbit
APOLLO SPACECRAFT↗
Study of a Renovated Command Module Laboratory and Renovated Command Module. Volume 4 - Resources Requirements Analysis Final Report
Resources requirements and cost analysis for Renovated Command Module /RCM/ using Block 2 recovered Apollo vehicle and RCM laboratories using Block 1 or Block 2 Apollo vehicles
Dodds, J. I.↗
Detection, Estimation, and Modulation Theory. Part 1 - Detection, Estimation, and Linear Modulation Theory.
Detection, estimation and linear modulation theory, Part 1, covering random processes, signal detection in noise and continuous waveforms
Van Trees, H. L.↗
A delta modulation threshold extension technique for frequency modulation systems
Delta modulation threshold extension technique for phase lock loop FM demodulator
Arndt, G. D.↗
Space storable propellant module thermal control technology. Volume 1 - OF2/B2H6 propulsion module Summary report
Space storable oxygen fluoride/boron hydride tank module thermal control design for Jupiter mission
De Land, R. E.↗
Space storable propellant module thermal control technology. Volume 2 - F2/N2H4 propulsion module Summary report
Space storable fluorine/hydrazine tank module thermal control design for Jupiter mission
De Land, R. E.↗
Detection, estimation, and modulation theory. Part 2 - Nonlinear modulations theory
Book on nonlinear modulation based on optimum estimation theory covering phase synchronization, analog data transmission, digital and analog systems performance, Markov processes, etc
Van Trees, H. L.↗
Bioresearch module design definition and space shuttle vehicle integration. Volume 2: Preliminary bioresearch module development program plan
The planning, schedules, direction, and management necessary to effectively perform the design, development, evaluation, and flight of two type 1 and two type 2 bioresearch modules are described.
Source record↗
Impingement effect of service module reaction control system engine plumes. Results of service module reaction control system plume model force field application to an inflight Skylab mission proximity operation situation with the inflight Skylab response
Plume impingement effects of the service module reaction control system thruster firings were studied to determine if previous flight experience would support the current plume impingement model for the orbiter reaction control system engines. The orbiter reaction control system is used for rotational and translational maneuvers such as those required during rendezvous, braking, docking, and station keeping. Therefore, an understanding of the characteristics and effects of the plume force fields generated by the reaction control system thruster firings were examined to develop the procedures for orbiter/payload proximity operations.
Lobb, J. D., Jr.↗
The 25 kW power module evolution study. Part 3: Conceptual designs for power module evolution. Volume 2: Program plans
A plan is presented for the evolutionary development and deployment of the power module system with performance capabilities required to support the 1983 to 1990 user requirements. Aspects summarized include program functional, operational, and hardware elements; program work breakdown and specification items; development plans and schedules for developmental and technology milestones; test concepts and timeliness; and ground and orbit operations concepts.
Source record↗
The 25 kW power module evolution study. Part 3: Conceptual designs for power module evolution. Volume 4: Design analyses
Topics covered include growth options evaluation, mass properties, attitude control and structural dynamics, contamination evaluation, berthing concepts, orbit reboost options and growth kit concepts. Systems support elements and space support equipment are reviewed with emphasis on power module operations and technology planning.
Source record↗
The 25 kW power module evolution study. Part 3: Conceptual design for power module evolution. Volume 6: WBS and dictionary
Program elements of the power module (PM) system, are identified, structured, and defined according to the planned work breakdown structure. Efforts required to design, develop, manufacture, test, checkout, launch and operate a protoflight assembled 25 kW, 50 kW and 100 kW PM include the preparation and delivery of related software, government furnished equipment, space support equipment, ground support equipment, launch site verification software, orbital verification software, and all related data items.
Source record↗
Design, fabrication, test, qualification and price analysis of third generation design solar cell modules. Part 1: Intermediate load module
The updated program plan and narrative reflects the design and development work done and progress made in establishing a viable design for these modules. Design alterations from the preproduction plan are discussed based on experience gained during the preproduction phase of the program.
Bottenberg, W. R.↗
Solar modulation of galactic cosmic rays. V - Time-dependent modulation
A numerical technique is introduced for the solution of the time-dependent equation for the solar modulation of galactic cosmic rays, in which transport in heliographic latitude is ignored. We illustrate this method with a model for the solar cycle variation in cosmic ray intensity. The variation is assumed to result from changes in the number of enhanced cosmic ray scattering regions, which are produced by flare-generated shock waves in the solar wind. The model can account for the observed solar cycle variation in intensity at different energies as well as the observed spatial gradients. This model also provides a natural explanation for the cosmic ray hysteresis effect.
Perko, J. S.↗
Advanced modulation technology development for earth station demodulator applications. Coded modulation system development
A jointly optimized coded modulation system is described which was designed, built, and tested by COMSAT Laboratories for NASA LeRC which provides a bandwidth efficiency of 2 bits/s/Hz at an information rate of 160 Mbit/s. A high speed rate 8/9 encoder with a Viterbi decoder and an Octal PSK modem are used to achieve this. The BER performance is approximately 1 dB from the theoretically calculated value for this system at a BER of 5 E-7 under nominal conditions. The system operates in burst mode for downlink applications and tests have demonstrated very little degradation in performance with frequency and level offset. Unique word miss rate measurements were conducted which demonstrate reliable acquisition at low values of Eb/No. Codec self tests have verified the performance of this subsystem in a stand alone mode. The codec is capable of operation at a 200 Mbit/s information rate as demonstrated using a codec test set which introduces noise digitally. The measured performance is within 0.2 dB of the computer simulated predictions. A gate array implementation of the most time critical element of the high speed Viterbi decoder was completed. This gate array add-compare-select chip significantly reduces the power consumption and improves the manufacturability of the decoder. This chip has general application in the implementation of high speed Viterbi decoders.
Miller, Susan P.↗
Ultra-Wideband Optical Modulation Spectrometer (OMS) Development: Study of the Optical Setup of a Wide-Band Optical Modulation Spectrometer
The purpose of this study is to advance the design of the optical setup for a wide-band Optical Modulation Spectrometer (OMS) for use with astronomical heterodyne receiver systems. This report describes the progress of this investigation achieved from March until December 2001.
Tolls, Volker↗
The Joint CCSDS-SFCG Modulation Study--A Comparison of Modulation Schemes
This paper compares the various modulation schemes, namely, PCM/PSK/PM, PCM/PM and BPSK. The subcarrier wave form for PCM/PSK/PM can be either square wave or sine wave, and the data format for PCM/PM and BPSK can be wither NRZ or Bi-phase.
square waves↗