  We reconsidered the anomalies or extra disturbances in gravitational
reference sensors (GRS), that would possibly take place in the science
operations of the LISA and the LISA-like Taiji missions. The set of time delay
interferometer channels $P^{(N)}_i$ are suggested in this work to sufficiently
suppress such GRS position noises of the $ith$ spacecraft. Given the optimal
orbits, we proved that the suppression factor could reach $10^{-5}\sim 10^{-3}$
in the sensitive band $0.1\ mHz \sim 0.05\ Hz$ for the LISA and Taiji missions.
Even for the extreme cases that the GRS noises of one S/C$_i$ have grown to
$4\sim 5$ orders of magnitude larger than the designed level, the channel
$P^{(N)}_i$ could still successfully wipe out the extra noises and retain the
expected sensitivity level. With this approach, the feasibility of the LISA and
Taiji missions could be improved, and the risks relate to GRS systems could be
significantly reduced.
