Abstract: Recently, different countries made rapid developments in the field of hypersonic aircraft in near space. The successful flight tests of hypersonic aircraft X-51A and HTV-2 were representative.They adopted the way of nonballistic maneuver flight whose motion trajectory was characterized by “hopping”, which existed the problems of difficulties of nonballistic target acceleration estimation, trajectory tracking and prediction. Four typical nonballistic maneuver models of near space targets of tracking filter are introducedand then target ballistic equation and design of tracking filter are introduced. At last, an estimation of four tracking filter ways is maken towards target acceleration. The effect of particle filter algorithm is the best which compares four nonballistic maneuver models with Matlab simulation results. The algorithms guarantees the target tracking accuracy within the allowable range, validity of the algorithm is verified with Matlab simulation results. This is important to the research of tracking nonballistic near space targers.

Key words: nonballistic, near space, maneuver mode, tracking filter