Spectrum analysis of various modulation schemes to determine the most desirable modulation method for use in tracking of high-altitude satellites.
Grady, Noel A., Jr.
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The existence of the space age has put strenuous demands on the communication techniques used in obtaining high-accuracy range, range - rate, angle and angle-rate data to be used in tracking of high-altitude satellites and other space vehicles. The tremendous distances involved require that sophisticated modulation techniques be used to help obtain reliable signals as free from noise as possible. The important factors which must be considered in picking a modulation method are discussed and a spectrum analysis and a signal-tonoise ratio comparison of two of the more promising methods of modulation (amplitude modulation -single side band- and phase modulation) are made. Through the use of a detail spectrum analysis of different modulation techniques one can see certain advantages and disadvantages of the techniques proposed. The writer would like to thank Professor George M. Hahn of the U. S. Naval Postgraduate School for the assistance and advice given by him during the preparation of this analysis.
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