Explanation of LidarBoost Algorithm?
It sounds like $W_k$ is just a matrix of 1's and 0's.  When $W_k$ is a 1, then the corresponding range value in $D_k$ is used. If it's a 0, then that range value is not used.

Similarly, $T_k$ should be mostly 1, and 0 when the corresponding $D_k$ values are unreliable.

Does that tally with your understanding?  If not, can you elaborate on your question with more details of what you suspect?