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  • 1
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    The goldstone real-time connected element interferometer (1992)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Connected element interferometry (CEI) is a technique of observing a celestial radio source at two spatially separated antennas and then interfering the received signals to extract the relative phase of the signal at the two antennas. The high precision of the resulting phase delay data type can provide an accurate determination of the angular position of the radio source relative to the baseline vector between the two stations. This article describes a recently developed connected element interferometer on a 21-km baseline between two antennas at the Deep Space Network's Goldstone, California, tracking complex. Fiber-optic links are used to transmit the data to a common site for processing. The system incorporates a real-time correlator to process these data in real time. The architecture of the system is described, and observational data are presented to characterize the potential performance of such a system. The real-time processing capability offers potential advantages in terms of increased reliability and improved delivery of navigational data for time-critical operations. Angular accuracies of 50-100 nrad are achievable on this baseline.
    Keywords: COMMUNICATIONS AND RADAR
    Type: The Telecommunications and Data Acquisition; p 52-62
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Applications of satellite technology to broadband ISDN networks (1992)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Two satellite architectures for delivering broadband integrated services digital network (B-ISDN) service are evaluated. The first is assumed integral to an existing terrestrial network, and provides complementary services such as interconnects to remote nodes as well as high-rate multicast and broadcast service. The interconnects are at a 155 Mbs rate and are shown as being met with a nonregenerative multibeam satellite having 10-1.5 degree spots. The second satellite architecture focuses on providing private B-ISDN networks as well as acting as a gateway to the public network. This is conceived as being provided by a regenerative multibeam satellite with on-board ATM (asynchronous transfer mode) processing payload. With up to 800 Mbs offered, higher satellite EIRP is required. This is accomplished with 12-0.4 degree hopping beams, covering a total of 110 dwell positions. It is estimated the space segment capital cost for architecture one would be about $190M whereas the second architecture would be about $250M. The net user cost is given for a variety of scenarios, but the cost for 155 Mbs services is shown to be about $15-22/minute for 25 percent system utilization.
    Keywords: COMMUNICATIONS AND RADAR
    Type: NASA-CR-189199 , NAS 1.26:189199 , LORAL-SS/L-TR00823
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Technical and economic feasibility of integrated video service by satellite (1992)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The trends and roles of satellite based video services in the year 2010 time frame are examined based on an overall network and service model for that period. Emphasis is placed on point to point and multipoint service, but broadcast could also be accommodated. An estimate of the video traffic is made and the service and general network requirements are identified. User charges are then estimated based on several usage scenarios. In order to accommodate these traffic needs, a 28 spot beam satellite architecture with on-board processing and signal mixing is suggested.
    Keywords: COMMUNICATIONS AND RADAR
    Type: NASA-CR-189210 , NAS 1.26:189210
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Satellite delivery of B-ISDN services (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: This paper will address the role of technology in the satellite delivery of B-ISDN services. Satellites excel in serving remote users and in providing multicast and broadcast services. Benefits to potential users employing these satellite broadband services will be examined together with their respective network architecture. Two application requirements are then proposed. The critical technologies needed in the realization of these architectures will be identified.
    Keywords: COMMUNICATIONS AND RADAR
    Type: AIAA PAPER 92-1831 , AIAA International Communication Satellite Systems Conference and Exhibit; Mar 22, 1992 - Mar 26, 1992; Washington, DC; United States
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Technical and economic feasibility of integrated video service by satellite (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A feasibility study is presented of utilizing modern satellite technology, or more advanced technology, to create a cost-effective, user-friendly, integrated video service, which can provide videophone, video conference, or other equivalent wideband service on demand. A system is described that permits a user to select a desired audience and establish the required links similar to arranging a teleconference by phone. Attention is given to video standards, video traffic scenarios, satellite system architecture, and user costs.
    Keywords: COMMUNICATIONS AND RADAR
    Type: AIAA PAPER 92-2054 , AIAA International Communication Satellite Systems Conference and Exhibit; Mar 22, 1992 - Mar 26, 1992; Washington, DC; United States
    Format: text
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
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