The work principle of data link based on mid-and-long range compound guidance air-to-air missile in midcourse guidance is analyzed,and missile moving model,target maneuvering model,midcourse guidance law model and midcourse and terminal guidance handing-off model are established too.

A mathematical model for the probability of successful handover(PSH) was established to solve the handover problem of INS/passive radar/SAR multi-mode seeker;a solution of handover parameters was also put forward.

Successful handover from midcourse guidance phase to terminal guidance phase is one of the most important key issues of multi-mode seekers.

The class collective with high organization and good function benefits the actualisation of the educational goals at college and brings about the high efficiency in teaching and management.

A college tutor should build up the human-oriented idea,respect and care for students,and especially pay more attention to the organization and cultivation of the class collective.

A class collective in the tertiary college is the starting-point and the end-result of students ideological education and administrative management.

With the development of market economy in our country, and the carrying out of credit system of colleges and universities, the idea of class collectivity gradually desalinates in colleges and universities, its’ cohesire force is gradually becoming weak, which has effected the training of the students’ team spirit.

A newly-built class is not bound to be a class collectivity.

Research on systematics-based college students class construction rules;

On How to Develop the Self-educatian Ability of Middle Students at Class;

Good class is not formed naturally,but the result of class teacher s long-term,deep,careful and diligent work.