Without considering the coplanarity or nearly coplanarity of space targets

there exist an intersection line on the orbital planes of two space targets

and the possible intersection of two space targets occurs near the orbital intersection line. In addition

the orbit of space targets is affected by various perturbation forces

and the distance between two space targets has certain fluctuations

but the overall approach distance has a gradual trend when time changes. Therefore

a spatial target approach analysis method with additional time windows is proposed. The results show that this method can quickly and accurately analyze the approach between space targets

and obtain the parameters such as the closet approach time and approach distance between two space targets

especially for the global collision warning

which will effectively reduce the calculation time and improve computation efficiency by more than 10%.