•Likely to be dominated by satellites at many frequencies, both GSO and non-GSO.
•Problem of the GSO belt. For several days, twice a year, the sun may be unobservable at certain frequencies as it passes behind the GSO belt, and strong GSO satellite signals come into the main beam of the FASR antennas.
•RFI excision: before or after correlation?
•Does RFI drive the digitization precision?