Informes Técnicos
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Browsing Informes Técnicos by Subject "Artificial satellites"
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Item Open Access A new phase measuring technique for the minitrack satellite tracking system(Instituto Geofísico del Perú, 1960) Woodman Pollitt, Ronald FranciscoA New Phase Measuring Technique has been developed as a solution to some of the present limitation of Minitrack Satellite Tracking System. Two main problems are solved, one concerned with the processing of the information and the other, with the sensitivity of the system. The present Minitrack is not a real time system. The output information has to be solved from ambiguity, smoothed, and corrected at a centralized computer location with a resultant time delay. The output of the mew system is real time, free from ambiguity, and fully corrected. It will be used to plot the satellite position in X and Y coordinates and could be used to drive telemetry, antennas or optical cameras. Its digital output is a five decimal digit directional cosine number ready for transmission to the centralized computer for orbital computation. The present Minitrack sensitivity is determined by a passive 10 cps bandwidth filter. The bandwidth is the narrowest bandwidth with linear phase vs frequency characteristics for a maximun differential doppler shift of 2 cps (approximately 2 ° per second angular rate).Item Open Access A phase-locked phase filter for the minitrack system(National Aeronautics and Space Administration, 1962-09) Woodman Pollitt, Ronald FranciscoA variable-bandwidth filter has been designed and built to narrow the postdetection bandwidth of the Minitrack satellite tracking system. It is based on phase-lock techniques. Al its narrowest bandwidth, 0.03 cps, the phase peak-topeak noise deviations are reduced to ± 1.5 percent of a wavelength for a signal strength of -140 dbm coming into the receiver "front ends". The filter introduces no phase shift or time delay regardless of the signal phase rate.Item Open Access A progress report on scintillation observations at Ancón And Jicamarca observatories(Goddard Space Flight Center, GSFC, 1970-10) Pomalaza, José; Woodman Pollitt, Ronald Francisco; Tisnado, Gilberto; Sandoval, Jaime; Guillén, AlbertoThe purpose of this report is to present a preliminary analysis of the data collected in connection with NASA contract work with ESSA (ESSA contract No. E22-9-70(N)). Under this contract a study of equatorial ionospheric irregularities using satellite transmissions is being performed.