  An international project is underway to design and build a radio telescope
with an effective collecting area two orders of magnitude greater than the
largest existing instruments. One of the many scientific goals of this
instrument will be the investigation of the extragalactic radio source
population at flux densities two to three orders of magnitude fainter than the
limits of existing observations. We present simulations of the radio sky at 1.4
GHz down to a flux density limit of 0.1 microJy using extrapolations of known
radio luminosity functions for two different population scenarios. The
resulting simulations confirm that a resolution of 0.1" is necessary to avoid
formal confusion, but source blending may still dominate if the intrinsic size
of such faint sources is larger than a few kiloparsecs.
