  We perform a detailed analysis and simulations on the transient detection
capability in the near-ultraviolet (NUV) band by focusing on some major local
transient events. These events include the tidal disruption event due to a
supermassive blackhole, the shock breakout of a core-collapse supernova and the
flare of a late-type star. Our simulations show that a set of small wide-angle
NUV cameras can allow us to detect and study numerous galactic and
extra-galactic transient events. Based on the analysis and simulations, here we
propose a space-based NUV sky patrol mission by updating the proposal that was
originally submitted to the Chinese Space Station mission in 2011. The mission
proposed here is composed of a set of eight small wide-field NUV cameras each
with a diameter of 20cm. The total sky area simultaneously covered by the NUV
cameras is as large as 3000$\mathrm{deg^2}$. The survey cadence ranges from 30
to 300s. The transient events are required to be detected by a dedicated
on-board software in real time.
