Interferometric Observations of Geosynchronous Satellites
  In recent years, a large number of geosynchronous satellites are being planned to provide augmentation services for enhancing the precision to global positioning systems, e.g., GPS, in applications such as aircraft landing. In this paper, we present a scheme for co-locating passive satellite observational facilities with a radio astronomy facility to open a new possibility of providing valuable data for radio astronomical imaging, ionospheric studies and satellite orbit estimation. 
C.R. Subrahmanya, Peeyush Prasad, R. Somashekar
physics.space-ph