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  • 1
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    Explosion seismological study for velocity distribution and structure of the crust and upper mantle from Damxung to Yadong of the Xizang plateau (1981)
    Science Press
    In:  Professional Paper, Open-File Rept., Geological and Ecological Studies of Qinghai-Xizang Plateau, Proceedings of the Symposium on Qinghai-Xizang (Tibet) Plateau, Beijing, China, Science Press, vol. I, Geology, Geological History and Origin of the Qinghai-Xizang Plateau, no. 16, pp. 691-709, (ISBN 1-86239-165-3, vi + 330 pp.)
    Details
    Publication Date: 1981
    Keywords: Deep seismic sounding (espec. cont. crust) ; CRUST ; Tibet ; earth mantle ; BIBTEX?
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    BIBLIOGRAPHY SEISMOLOGY
  • 2
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    ROCSAT-1 telecommunication experiments (1993)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: This paper addresses a telecommunication payload project approved by the R.O.C. NSPO's ROCSAT-1 space program. This project will enable several innovative experiments via the low-earth-orbit satellite ROCSAT-1, including multipath fading channel characterization, ionospheric scintillation measurement, real-time voice communications, and CDMA data communications. A unified L/S-band transponder payload is proposed for conducting these experiments in an efficient way. The results of these experiments would provide the evolving mobile communication communities with fruitful information.
    Keywords: COMMUNICATIONS AND RADAR
    Type: JPL, Proceedings of the Third International Mobile Satellite Conference (IMSC 1993); p 199-204
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Space Shuttle/TDRSS communication and tracking systems analysis (1986)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: In order to evaluate the technical and operational problem areas and provide a recommendation, the enhancements to the Tracking and Data Delay Satellite System (TDRSS) and Shuttle must be evaluated through simulation and analysis. These enhancement techniques must first be characterized, then modeled mathematically, and finally updated into LinCsim (analytical simulation package). The LinCsim package can then be used as an evaluation tool. Three areas of potential enhancements were identified: shuttle payload accommodations, TDRSS SSA and KSA services, and shuttle tracking system and navigation sensors. Recommendations for each area were discussed.
    Keywords: COMMUNICATIONS AND RADAR
    Type: NASA-CR-171948 , NAS 1.26:171948 , TR-8514-02
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Noncoherent sampling technique for communications parameter estimations (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: This paper presents a method of noncoherent demodulation of the PSK signal for signal distortion analysis at the RF interface. The received RF signal is downconverted and noncoherently sampled for further off-line processing. Any mismatch in phase and frequency is then compensated for by the software using the estimation techniques to extract the baseband waveform, which is needed in measuring various signal parameters. In this way, various kinds of modulated signals can be treated uniformly, independent of modulation format, and additional distortions introduced by the receiver or the hardware measurement instruments can thus be eliminated. Quantization errors incurred by digital sampling and ensuing software manipulations are analyzed and related numerical results are presented also.
    Keywords: COMMUNICATIONS AND RADAR
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Autonomous Integrated Receive System (AIRS) requirements definition. Volume 3: Performance and simulation (1984)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The autonomous and integrated aspects of the operation of the AIRS (Autonomous Integrated Receive System) are discussed from a system operation point of view. The advantages of AIRS compared to the existing SSA receive chain equipment are highlighted. The three modes of AIRS operation are addressed in detail. The configurations of the AIRS are defined as a function of the operating modes and the user signal characteristics. Each AIRS configuration selection is made up of three components: the hardware, the software algorithms and the parameters used by these algorithms. A comparison between AIRS and the wide dynamics demodulation (WDD) is provided. The organization of the AIRS analytical/simulation software is described. The modeling and analysis is for simulating the performance of the PN subsystem is documented. The frequence acquisition technique using a frequency-locked loop is also documented. Doppler compensation implementation is described. The technological aspects of employing CCD's for PN acquisition are addressed.
    Keywords: COMMUNICATIONS AND RADAR
    Type: NASA-CR-175263 , NAS 1.26:175263 , TR-0884-8211-VOL-3
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    User manual of the CATSS system (version 1.0) communication analysis tool for space station (1983)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The Communication Analysis Tool for the Space Station (CATSS) is a FORTRAN language software package capable of predicting the communications links performance for the Space Station (SS) communication and tracking (C & T) system. An interactive software package was currently developed to run on the DEC/VAX computers. The CATSS models and evaluates the various C & T links of the SS, which includes the modulation schemes such as Binary-Phase-Shift-Keying (BPSK), BPSK with Direct Sequence Spread Spectrum (PN/BPSK), and M-ary Frequency-Shift-Keying with Frequency Hopping (FH/MFSK). Optical Space Communication link is also included. CATSS is a C & T system engineering tool used to predict and analyze the system performance for different link environment. Identification of system weaknesses is achieved through evaluation of performance with varying system parameters. System tradeoff for different values of system parameters are made based on the performance prediction.
    Keywords: COMMUNICATIONS AND RADAR
    Type: NASA-CR-171728 , NAS 1.26:171728 , TR-1183-8314
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    Shuttle Communications and Tracking Systems Modeling and TDRSS Link Simulations Studies (1985)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: An analytical simulation package (LinCsim) which allows the analytical verification of data transmission performance through TDRSS satellites was modified. The work involved the modeling of the user transponder, TDRS, TDRS ground terminal, and link dynamics for forward and return links based on the TDRSS performance specifications (4) and the critical design reviews. The scope of this effort has recently been expanded to include the effects of radio frequency interference (RFI) on the bit error rate (BER) performance of the S-band return links. The RFI environment and the modified TDRSS satellite and ground station hardware are being modeled in accordance with their description in the applicable documents.
    Keywords: SPACE TRANSPORTATION
    Type: NASA-CR-171861 , NAS 1.26:171861 , TR-8411-1
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 8
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    UCMS - A new signal parameter measurement system using digital signal processing techniques (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The User Constraint Measurement System (UCMS) is a hardware/software package developed by NASA Goddard to measure the signal parameter constraints of the user transponder in the TDRSS environment by means of an all-digital signal sampling technique. An account is presently given of the features of UCMS design and of its performance capabilities and applications; attention is given to such important aspects of the system as RF interface parameter definitions, hardware minimization, the emphasis on offline software signal processing, and end-to-end link performance. Applications to the measurement of other signal parameters are also discussed.
    Keywords: COMMUNICATIONS AND RADAR
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    NASA TECHNICAL REPORTS
  • 9
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    POLAR/TIDE Perigee Observations of Thermal O(+) Characteristics in the Polar Cap Region (1998)
    In:  Other Sources
    Details
    Publication Date: 2019-07-17
    Description: We analyze in situ moment measurements of thermal O(+) from the Thermal Ion Dynamics Experiment (TIDE) on POLAR for April - May, 1996. These measurements were obtained near 5000 km altitude within the polar cap ionosphere - magnetosphere interface region. Su explored certain aspects of O(+) parameters in this region. In this report, we hope to expand our knowledge of the O(+) behavior by examining relationships of densities, parallel velocities, and temperatures to the convection velocities, IMF By and Bz components. Preliminary studies with the convection velocities currently require further analysis. In doing so, we are guided in part by the Cleft Ion Fountain paradigm and model developed by which involves downward O(+) flows in the polar magnetosphere. Initial results tend to indicate that in the extreme antisunward region of the polar cap, the density decreases with increasing convection velocity.
    Keywords: Geophysics
    Type: Modeling; Oct 26, 1998; Guntersville, AL; United States
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    NASA TECHNICAL REPORTS
  • 10
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    Near-Simultaneous POLAR and DMSP Measurements of Topside Ionospheric Up and Down Flows at High Latitudes (2000)
    In:  Other Sources
    Details
    Publication Date: 2019-07-17
    Description: We will present what we believe to be the first reported observations of up- and downflows of topside ionospheric thermal plasmas from multiple near-simultaneous tracks through the high-latitude topside ionosphere. From several Southern polar passes, it has been possible to construct plots of field-aligned flows of 0+ observed by the Thermal Ion Dynamics Experiment(TIDE) on the POLAR spacecraft near 5000 km altitude together with vertical ion flow observations from one or more DMSP spacecraft near 800 km altitude. These observations provide a glimpse of the wide-spread upward and downward ionospheric ion flows over the broad polar region along multiple distinct satellite tracks. For the instances where DMSP and POLAR cross nearly the same field lines at the 800 and 5000 kin altitudes, we will show ion parameter measurements at these to altitudes in comparison to Dynamic Fluid-Kinetic(DyFK) transport simulations of anticipated altitude profiles of these parameters.
    Keywords: Geophysics
    Type: Jun 01, 2000; Washington, DC; United States
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    NASA TECHNICAL REPORTS
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