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  • 1
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    Digital Doppler measurement with spacecraft (1991)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Digital and analog phase-locked loop (PLL) receivers were operated in parallel, each tracking the residual carrier from a spacecraft. The PLL tracked the downlink carrier and measured its instantaneous phase. This information, combined with a knowledge of the uplink carrier and the transponder ratio, permitted the computation of a Doppler observable. In this way, two separate Doppler measurements were obtained for one observation window. The two receivers agreed on the magnitude of the Doppler effect to within 1 mHz. There was less jitter on the data from the digital receiver. This was due to its smaller noise bandwidth. The demonstration and its results are described.
    Keywords: SPACE COMMUNICATIONS, SPACECRAFT COMMUNICATIONS, COMMAND AND TRACKING
    Type: IEEE Transactions on Instrumentation and Measurement (ISSN 0018-9456); 40; 727-731
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    The advanced receiver 2: Telemetry test results in CTA 21 (1991)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Telemetry tests with the Advanced Receiver II (ARX II) in Compatibility Test Area 21 are described. The ARX II was operated in parallel with a Block-III Receiver/baseband processor assembly combination (BLK-III/BPA) and a Block III Receiver/subcarrier demodulation assembly/symbol synchronization assembly combination (BLK-III/SDA/SSA). The telemetry simulator assembly provided the test signal for all three configurations, and the symbol signal to noise ratio as well as the symbol error rates were measured and compared. Furthermore, bit error rates were also measured by the system performance test computer for all three systems. Results indicate that the ARX-II telemetry performance is comparable and sometimes superior to the BLK-III/BPA and BLK-III/SDA/SSA combinations.
    Keywords: SPACE COMMUNICATIONS, SPACECRAFT COMMUNICATIONS, COMMAND AND TRACKING
    Type: The Telecommunications and Data Acquisition Report; p 140-156
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Digital Doppler extraction demonstration with the advanced receiver (1990)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: A digital Doppler extraction demonstration with the Advanced Receiver 2 (ARX 2) tracking Pioneer 10 and Voyager 2 is described. The measured results are compared with those of the Block 4 receiver that was operating in parallel with the ARX 2. It is shown that the ARX 2 outperforms the Block 4 receiver in terms of Allan variance of the Doppler residuals, the amount of which depends on the scenario of interest.
    Keywords: COMMUNICATIONS AND RADAR
    Type: The Telecommunications and Data Acquisition Report; p 160-173
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Studies of an artificially shock-loaded H group chondrite (1984)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: SEM and TEM, together with thermoluminescence (TL), are used to study five samples of the naturally unshocked Kernouve (H6) meteorite that were shock-loaded to pressures of 70, 165, 270, and 390 kbar. Attention is given to olivine and orthopyroxene deformation mechanisms at these pressure levels. The microhardness of the kamacite in the samples increases with shock pressure, and it is noted that annealed kamacite displays incipient crystallinity, while alpha-martensite and taenite sometimes contain slip lines. At pressures over 200 kbar, there was a systematic decrease in both natural TL and TL sensitivity. Changes in the ratio of these two values for various regions of the TL glow curve suggest that two processes were effective during shock: thermal drainage of electron traps and a reduction in the effective trap density. Thermal effects with widespread annealing are noted in the case of a sample subjected to shock pulse.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Geochimica et Cosmochimica Acta (ISSN 0016-7037); 48; 343-360
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Sequence-of-events-driven automation of the deep space network (1996)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: In February 1995, sequence-of-events (SOE)-driven automation technology was demonstrated for a Voyager telemetry downlink track at DSS 13. This demonstration entailed automated generation of an operations procedure (in the form of a temporal dependency network) from project SOE information using artificial intelligence planning technology and automated execution of the temporal dependency network using the link monitor and control operator assistant system. This article describes the overall approach to SOE-driven automation that was demonstrated, identifies gaps in SOE definitions and project profiles that hamper automation, and provides detailed measurements of the knowledge engineering effort required for automation.
    Keywords: Communications and Radar
    Type: The Telecommunications and Data Acquisition Report; 153-173; NASA-CR-200264
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Sequence-of-Events-Driven Automation of the Deep Space Network (1996)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: In February 1995, sequence-of-events (SOE)-driven automation technology was demonstrated for a Voyager telemetry downlink track at DSS 13. This demonstration entailed automated generation of an operations procedure (in the form of a temporal dependency network) from project SOE information using artificial intelligence planning technology and automated execution of the temporal dependency network using the link monitor and control operator assistant system. This article describes the overall approach to SOE-driven automation that was demonstrated, identifies gaps in SOE definitions and project profiles that hamper automation, and provides detailed measurements of the knowledge engineering effort required for automation.
    Keywords: Communications and Radar
    Type: The Telecommunications and Data Acquisition Report; 153-173; NASA/CR-95-112584
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    The Advanced Receiver II telemetry test results at Goldstone (1991)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The telemetry performance of the Advanced Receiver II (ARX-II) in tracking and demodulating signals from various deep space missions is described. The tests were performed at Goldstone, and the spacecrafts tracked were Pioneer 10, Pioneer 11, Voyager 2, Magellan, and the International Cometary Explorer (ICE). These missions present a broad range of operating conditions to test the ARX-II in terms of signal-to-noise ratio (SNR) and the symbol rate of the received signal.
    Keywords: SPACE COMMUNICATIONS, SPACECRAFT COMMUNICATIONS, COMMAND AND TRACKING
    Type: The Telecommunications and Data Acquisition Report; p 119-131
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    Return to the red planet: The Mars Observer Mission (1993)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: An overview of the Mars Observer Mission is discussed. Highlights include: (1) the spacecraft; (2) the instrumentation and science experiments; (3) the countries involved; (4) the flight teams; and (5) the planet Mars itself (a brief history). Photographs and flow charts are included, along with diagrams of instrumentation and a brief historical narrative of space observation and exploration.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA-CR-197707 , JPL-400-504 , NAS 1.26:197707
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 9
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    Matching flow characteristics of standard shutoff valves eliminates need for custom fabricated valves (1966)
    In:  CASI
    Details
    Publication Date: 2019-05-29
    Description: Standard high pressure valves are used in low pressure fluid system testing when a substantial system pressure increase is required. The flow-vs-valve stroke is matched with that of the valves being replaced. Some correction to the plug contour may be necessary.
    Keywords: MECHANICS
    Type: MFS-1069
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 10
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    A survey of electric and hybrid vehicle simulation programs (1978)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Results of a survey conducted within the United States to determine the extent of development and capabilities of automotive performance simulation programs suitable for electric and hybrid vehicle studies are summarized. Altogether, 111 programs were identified as being in a usable state. The complexity of the existing programs spans a range from a page of simple desktop calculator instructions to 300,000 lines of a high-level programming language. The capability to simulate electric vehicles was most common, heat-engines second, and hybrid vehicles least common. Batch-operated programs are slightly more common than interactive ones, and one-third can be operated in either mode. The most commonly used language was FORTRAN, the language typically used by engineers. The higher-level simulation languages (e.g. SIMSCRIPT, GPSS, SIMULA) used by "model builders" were conspicuously lacking.
    Keywords: URBAN TECHNOLOGY AND TRANSPORTATION
    Type: NASA-CR-162457 , HCP/M1011-04
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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