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  • Other Sources  (2)
  • 2005-2009  (2)
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  • 1
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    Computing for Aiming a Spaceborne Bistatic-Radar Transmitter (2006)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: BISTAT is a computer program for use in aiming a spaceborne bistatic-radar transmitting antenna at a remote planet that has an atmosphere, such that after refraction by the atmosphere and reflection from the surface of the planet, the radar signal travels toward a receiver on Earth. BISTAT includes an algorithm that neglects atmospheric refraction and calculates a specular-reflection point for a spacecraft at a given location. The specular-reflection point is then used as an initial guess for a modified limb-track algorithm that takes atmospheric refraction into account. The output of BISTAT for all spacecraft positions of interest constitutes a pointing profile; the output data are in the form of an inertial-vector file and a Doppler-residual file. The inertial-vector file is used to command the attitude of the spacecraft; the Doppler-residual file is used to determine a downlink frequency file for the receiver.
    Keywords: Man/System Technology and Life Support
    Type: NPO-41518 , NASA Tech Briefs, September 2006; 20
    Format: application/pdf
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
  • 2
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    Computing Spacecraft-Pointing Vectors for Limb Tracking (2007)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: LMBTRK is a computer program that is used together with two software libraries known as ERHAND and HYBRRD to generate spacecraft-pointing vectors for limb-tracking maneuvers needed for experiments on propa gation of radio signals through planetary atmospheres. LMBTRK determi nes, as a function of time, the direction in which one must point a ray (representing a radio beam) emitted by a spacecraft in order to make the ray pass through a planetary atmosphere on its way to a receiving station at a known location.
    Keywords: Computer Programming and Software
    Type: NPO-40542 , NASA Tech Briefs, May 2007; 19
    Format: application/pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
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