The interest to deeply analyze the possible application of satellite navigation in lunar transfer is obvious. As in the case of HEO and GEO orbits, receiving antennas will be basically working in a look-down configuration, as no sources are presently located above a MEO altitude of about 20000 km. The signal is represented by the spill-over all around the Earth figure of the main lobe (beamwidth amplitude for GPS is about 28°) irradiated by satellites servicing the opposite hemisphere of the Earth. Additional signal is provided by secondary lobes of the GNSS satellites servicing the same Earth hemisphere the spacecraft is flying over. Low signal level due to the dependency on the square of the distance of this available signal, if any, makes the acquisition quite difficult and spaced out by frequent outage periods. Even if the acquisition is successful, the quite poor geometric dilution of precision factor leads to a coarse solution in terms of accuracy.
GNSS Navigation during Lunar Transfers / Palmerini, Giovanni Battista; Sabatini, Marco; Perrotta, G.. - ELETTRONICO. - (2009), pp. 1-10. (Intervento presentato al convegno European Conference on GNSS 2009 tenutosi a Napoli nel 4-6 maggio 2009).
GNSS Navigation during Lunar Transfers
PALMERINI, Giovanni Battista;SABATINI, MARCO;
2009
Abstract
The interest to deeply analyze the possible application of satellite navigation in lunar transfer is obvious. As in the case of HEO and GEO orbits, receiving antennas will be basically working in a look-down configuration, as no sources are presently located above a MEO altitude of about 20000 km. The signal is represented by the spill-over all around the Earth figure of the main lobe (beamwidth amplitude for GPS is about 28°) irradiated by satellites servicing the opposite hemisphere of the Earth. Additional signal is provided by secondary lobes of the GNSS satellites servicing the same Earth hemisphere the spacecraft is flying over. Low signal level due to the dependency on the square of the distance of this available signal, if any, makes the acquisition quite difficult and spaced out by frequent outage periods. Even if the acquisition is successful, the quite poor geometric dilution of precision factor leads to a coarse solution in terms of accuracy.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
