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aiming at the existence of target tracking in a large number of trigonometric function calculations, puts forward to establish trigonometric functions in the fire control computer calculating unit, trigonometric function is realized by using hardware decoding. And trigonometric function calculating unit is a kind of can complete sine function calculating function function of the chip. Its core design is based on Angle value address, through hardware look-up table, Value of 0 to 90 degrees of sine function, look-up table. Table look up precision can design to 0.001 °, maximum look-up table of time is the function of calculating time. Look-up table of time is the biggest function value calculation of time. Cosine look-up table calculation is to use sine the same chip, can look up table according to the relationship between phase difference of 90 degrees. Practice shows that trigonometric function of hardware decoding speed fast, high precision, the common method can replace the function of calculating. So, if in the fire control system, design an address decoder circuit, can create multiple trigonometric function calculating unit chip, Through computer data, instructions, the realization of parallel computing for multiple trigonometric function value, thus improve the system of multiple target fast track processing capacity.