Investigation On Design Of Homing Missile Strapdown Guidance System

As a new type of guidance technology, the strapdown homing guidance technology,which helps improve the system reliability and reduce costs efficiently, has been paidgreat attention to and developed quickly since the 1960s. But it also has disadvantages,in that the system observed value is equal to the angle error between the target sight andthe vertical axis of the missile body. In this thesis we designed a matched filter and a lowpass filter using an additional rate of compensation to improve the system stability, andanalyzed the applicability of the direct guidance law and the proportional guidance law.To get a better understanding of the homing strapdown guidance system, this the-sis firstly analyzed theoretically the property of the guidance trajectory of missiles of thedirect guidance law and the proportional guidance law. Also the advantages and disadvan-tages of the direct guidance law and the proportional guidance law was fully discussed.When qualitative analysis was done, we gave further simulation verification of the char-acteristic of the guidance trajectory of missiles.Secondly, this paper presented the algorithm of the target sight angle velocity ex-traction, and illustrated the principle of the whole theory strap guidance system. Then wegave a full analysis of the whole system using the proportional guidance law, designed amatched filter and a low pass filter to improve the system stability, and analyzed its effecton the system stability.Thirdly, this thesis presented the basic task of the ?ight guidance system, analyzedseveral typical ?ight control systems, and gave the advantages and disadvantages. Com-bined with the simulation, the thesis built an equivalent mode of the ?ight control system.In the end, a mathematical model of the guidance system was established in consid-eration of the Ballistic properties of the missile and the dynamic response of the controlsystem. Through simulation, the performance of two kinds of guidance law in a differentheight difference, guidance gain, scale factor and speed was analyzed.