  In this paper we demonstrate improved techniques to extend coherent
processing intervals for passive radar processing, with the Murchison Widefield
Array. Specifically, we apply a two stage linear range and Doppler migration
compensation by utilising Keystone Formatting and a recent dechirping method.
These methods are used to further demonstrate the potential for the
surveillance of space with the Murchison Widefield Array using passive radar,
by detecting objects orders of magnitude smaller than previous work. This paper
also demonstrates how the linear Doppler migration methods can be extended to
higher order compensation to further increase potential processing intervals.
