Abstract：Zhang Siying participated in the three-year development of the Hongjian73 control system and made significant contributions. He has successively solved three key problems, among them, identified the key factors that the missile cannot be controled, proposed audacious suggestion for correcting the installation angle of gyroscopes and provided the direction and amount of gyroscope installation angle correction, designed a convenient and intuitive control law based on command waveforms and synthetic vectors to solve the decoupling problem of a type of two channel cross coupling in rotating aircraft. In 1978, he was awarded the "Science and Technology Worker Award for Outstanding Contributions" by the National Science Conference.
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