Former DPA(Dynamic Programming Algorithm) has problems of low efficiency in energy accumulation with single point and could not detect entrance target in time. Focus on the problems we improved the DPA in three aspects and applied it in space small target detection. First

the recursive equation was improved to avoid information loss

which caused by manual defocus in the project

by multi-point accumulation. Second

the calculation of multi-velocity plane was simplified as velocity update to reduce the computational complexity. Third

special process was used to solve the problem of entrance targets. The contrastive experiment with real space images proved the validity of our improvements.