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    Earth-Space Link Attenuation Estimation via Ground Radar Kdp (2003)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: A method of predicting attenuation on microwave Earth/spacecraft communication links, over wide areas and under various atmospheric conditions, has been developed. In the area around the ground station locations, a nearly horizontally aimed polarimetric S-band ground radar measures the specific differential phase (Kdp) along the Earth-space path. The specific attenuation along a path of interest is then computed by use of a theoretical model of the relationship between the measured S-band specific differential phase and the specific attenuation at the frequency to be used on the communication link. The model includes effects of rain, wet ice, and other forms of precipitation. The attenuation on the path of interest is then computed by integrating the specific attenuation over the length of the path. This method can be used to determine statistics of signal degradation on Earth/spacecraft communication links. It can also be used to obtain real-time estimates of attenuation along multiple Earth/spacecraft links that are parts of a communication network operating within the radar coverage area, thereby enabling better management of the network through appropriate dynamic routing along the best combination of links.
    Keywords: Space Communications, Spacecraft Communications, Command and Tracking
    Type: MSC-23340 , NASA Tech Briefs, November 2003; 21-22
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Analyzing Radio-Frequency Coverage for the ISS (2007)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: The Interactive Coverage Analysis Tool (iCAT) is an interactive desktop computer program serving to (1) support planning of coverage, and management of usage of frequencies, of current and proposed radio communication systems on and near the International Space Station (ISS) and (2) enable definition of requirements for development of future such systems. The iCAT can also be used in design trade studies for other (both outer-space and terrestrial) communication systems. A user can enter the parameters of a communication-system link budget in a table in a worksheet. The nominal (onaxis) link values for the bit-to-noise-energy ratio, received isotropic power (RIP), carrier-to-noise ratio (C/N), power flux density (PFD), and link margin of the system are calculated and displayed in the table. Plots of field gradients for the RIP, C/N, PFD, and link margin are constructed in an ISS coordinate system, at a specified link range, for both the forward and return link parameters, and are displayed in worksheets. The forward and reverse link antenna gain patterns are also constructed and displayed. Line-of-sight (LOS) obstructions can be both incorporated into the gradient plots and displayed on separate plots.
    Keywords: Man/System Technology and Life Support
    Type: MSC-23536 , NASA Tech Briefs, September 2007; 22
    Format: application/pdf
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
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