Abstract:

Considering the earth’s oblateness effect of  J₂ perturbation, the optimal initial guidance of long-range intercept problem is researched. With the characteristic of long flight time, a disturbed modifying method of fixedtime interception is analyzed and improved, and the impulsive strategy of optimal long-range interception is put forward. The initial guidance algorithm of finite-thrust optimal interception is also studied via an optimal control method Legendre pseudospectral method (LPM). The precision and efficiency of this initial guidance method are demonstrated by applying it to a high eccentric orbit （HEO）vehicle with small inclination.