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  • 1
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    Solar-electric geocentric transfer (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Time-optimal or nearly-time-optimal trajectory computer program developed for solar-electric geocentric transfer considers yaw motion only, yaw and roll only, and unconstrained motion configurations.
    Keywords: MECHANICS
    Type: LEW-12939 , NASA Tech Briefs (ISSN 0145-319X); 3; 3; P. 419
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Inversion of scattered radiance horizon profiles for gaseous concentrations and aerosol parameters (1977)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Techniques have been developed and used to invert limb scan measurements for vertical profiles of atmospheric state parameters. The parameters which can be found are concentrations of Rayleigh scatters, ozone, NO2, and aerosols, and aerosol physical properties including a Junge-size distribution parameter and real and imaginary parts of the index of refraction.
    Keywords: GEOPHYSICS
    Type: NASA. Langley Res. Center Inversion Methods in Atmospheric Remote Sounding; p 217-263
    Format: text
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  • 3
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    Aerosol physical properties from satellite horizon inversion (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The feasibility is investigated of determining the physical properties of aerosols globally in the altitude region of 10 to 100 km from a satellite horizon scanning experiment. The investigation utilizes a horizon inversion technique previously developed and extended. Aerosol physical properties such as number density, size distribution, and the real and imaginary components of the index of refraction are demonstrated to be invertible in the aerosol size ranges (0.01-0.1 microns), (0.1-1.0 microns), (1.0-10 microns). Extensions of previously developed radiative transfer models and recursive inversion algorithms are displayed.
    Keywords: GEOPHYSICS
    Type: NASA-CR-112311 , R-758 , AER-24-F
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    A users manual for a computer program which calculates time optical geocentric transfers using solar or nuclear electric and high thrust propulsion (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: This manual is a guide for using a computer program which calculates time optimal trajectories for high-and low-thrust geocentric transfers. Either SEP or NEP may be assumed and a one or two impulse, fixed total delta V, initial high thrust phase may be included. Also a single impulse of specified delta V may be included after the low thrust state. The low thrust phase utilizes equinoctial orbital elements to avoid the classical singularities and Kryloff-Boguliuboff averaging to help insure more rapid computation time. The program is written in FORTRAN 4 in double precision for use on an IBM 360 computer. The manual includes a description of the problem treated, input/output information, examples of runs, and source code listings.
    Keywords: SPACE SCIENCES
    Type: NASA-CR-139038 , R-827
    Format: application/pdf
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  • 5
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    Solar electric geocentric transfer with attitude constraints: Analysis (1975)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A time optimal or nearly time optimal trajectory program was developed for solar electric geocentric transfer with or without attitude constraints and with an optional initial high thrust stage. The method of averaging reduces computation time. A nonsingular set of orbital elements is used. The constraints, which are those of one of the SERT-C designs, introduce complexities into the analysis and the solution yields possible discontinuous changes in thrust direction. The power degradation due to VanAllen radiation is modeled analytically. A wide range of solar cell characteristics is assumed. Effects such as oblateness and shadowing are included. The analysis and the results of many example runs are included.
    Keywords: ASTRODYNAMICS
    Type: NASA-CR-134927 , CSDL-R-901
    Format: application/pdf
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  • 6
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    Ozone profiling from backscattered UV radiance measurements A new procedure (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: This paper presents a data analysis technique that has been developed to support a stratospheric ozone measurement and profiling program. The data consist of solar backscattered UV radiation monitored by a spacecraft. The output consists of ozone mixing ratio profiles complete with error bars throughout the atmosphere. The technique is based upon principles of nonlinear optimal estimation. It provides a number of desirable features that have not been available together in any previously constructed technique for the problem. Iteration on both radiation measurements and total ozone measurements is among these features.
    Keywords: GEOPHYSICS
    Type: Applied Optics; 20; Mar. 15
    Format: text
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  • 7
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    Onboard navigation instrument requirements for outer-planet flyby missions (1970)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Operational and environmental factors constraining onboard navigation system design for outer planet flyby missions
    Keywords: NAVIGATION
    Type: INST. OF NAVIGATION, NATIONAL SPACE MEETING ON SPACE NAVIGATION - THEORY AND PRACTICE IN THE POST APOLLO ERA, NASA AMES RESEARCH CENTER; Feb 17, 1970 - Feb 19, 1970; MOFFETT FIELD, CA
    Format: text
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  • 8
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    A procedure for estimating the information content of SBUV ozone profiles (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A description is presented of a new procedure for determining ozone mixing ratios in the upper stratosphere from satellite observations of backscattered ultraviolet (SBUV) radiance. The employed approach is based on a SBUV inversion procedure. The inversion algorithm can best be described as a series of sequentially performed operations, taking into account the determination of a first guess profile, the representation of the ozone profile by a polynomial, the extension of the profile outside the measurement region, error assessment, the optimal ozone profile, and the utilization of iteration. It is found that the described ozone profiling algorithm can be implemented with sufficient computational speed to be used operationally for the inversion of SBUV data.
    Keywords: GEOPHYSICS
    Type: In: Quadrennial International Ozone Symposium; Aug 04, 1980 - Aug 09, 1980; Boulder, CO
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  • 9
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    Comparison of two sensors for outer planet mission onboard navigation. (1972)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Onboard instruments have been shown to be an effective aid to navigation on missions to the outer planets. The relationship of two possible candidate navigation instruments, an image tube (television) and a scanning photometer, with other systems such as data processing and attitude control is discussed. Certain key problem areas relating to the design of each sensor are considered, and the scientific uses of each sensor are examined. The navigational efficacy of both instruments is illustrated by some selected results from a navigation and guidance simulation of outer planet missions. It is concluded that both devices are viable alternatives for onboard outer planet navigation.
    Keywords: NAVIGATION
    Type: The growth and maturity of navigation in space; National Space Meeting; Mar 15, 1972 - Mar 16, 1972; Orlando, FL
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  • 10
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    Optimal low thrust geocentric transfer (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A computer code which will rapidly calculate time-optimal low thrust transfers is being developed as a mission analysis tool. The final program will apply to NEP or SEP missions and will include a variety of environmental effects. The current program assumes constant acceleration. The oblateness effect and shadowing may be included. Detailed state and costate equations are given for the thrust effect, oblateness effect, and shadowing. A simple but adequate model yields analytical formulas for power degradation due to the Van Allen radiation belts for SEP missions. The program avoids the classical singularities by the use of equinoctial orbital elements. Kryloff-Bogoliuboff averaging is used to facilitate rapid calculation. Results for selected cases using the current program are given.
    Keywords: PROPULSION SYSTEMS
    Type: AIAA PAPER 73-1074 , Electric Propulsion Conference; Oct 31, 1973 - Nov 02, 1973; Lake Tahoe, NV
    Format: text
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