Modified attitude pursuit guidance law for low-cost missiles using strap-down seekers

Attitude pursuit guidance law is suitable for low cost missiles. A strap-down seeker is used to achieve this guidance law. The additional angles of attack or sideslip caused by wind and by control system are considered as two disturbing factors which make attitude pursuit law impossible. Therefore, general attitude pursuit guidance law did not account for this two disturbing factors, because with those disturbing factors, it is difficult to apply. To solve the problem, the principle of strap-down seeker detecting target is investigated, the mathematical control model is established, then a modified attitude pursuit guidance law which employs the angular correction for those two disturbing factors is presented. It is proved that the modified attitude pursuit guidance law is appropriated to both in the presence of the additional angle of attack or sideslip via the simulations with the mathematical control model and Monte-Carlo method.