  Quantum metrology with entangled states in realistic noisy environments
always suffers from decoherence. Therefore, the measurement precision is
greatly reduced. Here we applied the dynamical decoupling method to protect the
$N$-qubit quantum metrology protocol and successfully revived the scaling of
the measurement precision as ${N^{-k}}$ with $k\in \left[{5/6,11/12}\right]$.
The degree of the precision revival, as determined by the noise spectrum
distribution, indicates that the performance of the protected protocol can be
further improved by controlling the noise spectrum. Such a protected protocol
is proved to be universal for entanglement-based quantum metrology in the pure
dephasing and relaxation noise, which should stimulate the development of
practical quantum metrology for weak signal detection of microscopic physics.
