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In order to improve the accuracy of laser seeker goniometry and intercepting the target shooting. Aiming at the effects of noise on the laser guidance system, on the principle of laser guidance, adopted a new DSP real-time control system based on software to deal with noise. First, the control circuit for high- low noise measured in real-time dynamic control threshold. Secondly, based on MATLAB simulation platform to get its noise multiple tables. Finally, the real-time control software on the DSP noise cancellation algorithm look-up table approach. The results show that this method greatly improves the signal to noise ratio, thereby enhancing the Terminal Guidance System heading and pitch angle measurement accuracy, and ultimately improve the missile hits the target . Through simulation laboratory data and field simulation test, two approaches:never add the noise process and add a handler to compare simulation and analysis of the results of two aspects, the validity of this method is reasonable and feasible.