Accession Number : ADA267279


Title :   The Method of Ratios


Descriptive Note : Journal article,


Corporate Author : AIR FORCE ACADEMY COLORADO SPRINGS CO


Personal Author(s) : Negron, David, Jr ; Alfano, Salvatore ; Wright, Daniel D , III


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a267279.pdf


Report Date : Jun 1992


Pagination or Media Count : 14


Abstract : This paper presents a detailed algorithm to compute a mean visibility report between a range-restricted ground station and a space object, generated by the method of ratios. This method is based upon the limiting orbital characteristics of a space object versus a ground station, which are used to generate a visibility report from an analytical model. For this study, the visibility report is defined as the mean minutes-per-day the space object is above the site's horizon and within sensor range. The computer simulation models orbital motion using first order secular perturbations caused by mass anomalies. The method of ratios reduces computation time by over 97% when the results are compared to a visibility truth table created using the satellite rise-set algorithm developed by Alfano et al. This method can also be used to evaluate all objects in a space catalogue against a network of range-restricted ground stations. Operations personnel can then use this master visibility report to maintain a current database of all space objects visible to a particular ground station, which is central for space surveillance radar sensors to perform efficient tracking.... Mathematical models, Numerical methods and procedures, Models, Visual surveillance, Tracking, Visibility, Air-to-space, Earth (planet) observation.


Descriptors :   *ALGORITHMS , *RATIOS , *SPACE SURVEILLANCE , *GROUND STATIONS , *SPACE OBJECTS , *VISIBILITY , *VISUAL SURVEILLANCE , *SATELLITE TRACKING SYSTEMS , DATA BASES , COMPUTERIZED SIMULATION , ANOMALIES , MASS , RADAR TRACKING , RADAR , HORIZON , SEARCH RADAR , SURVEILLANCE , EARTH(PLANET) , NUMERICAL METHODS AND PROCEDURES , MEAN , PERTURBATIONS , ARTIFICIAL SATELLITES , TIME , AIR TO SPACE , PLANETS , MOTION , OBSERVATION , COMPUTERS , COMPUTATIONS , REPRINTS , SIMULATION , MATHEMATICAL MODELS


Subject Categories : Active & Passive Radar Detection & Equipment
      Unmanned Spacecraft


Distribution Statement : APPROVED FOR PUBLIC RELEASE