Research On Digital Strapdown Servo Stable Algorithm For Missile

Radar seeker is a kind of radar equipment which could achieve in detecting target, tracking target, and guiding the missile flying to target by providing the target's location and motion parameters for the missile control system, strapdown inertial guidance strategy is the essential way to simplify the missile seeker's structure and cut the missile seeker's size. During the processing of tracking target, the missile body's pitch, roll and yaw which caused by the harsh flight environment and the missile's inner mechanical movement could couple with the radar seeker antenna in many ways, which result in the aggravation of tracking target and acquiring information of target. The digital strapdown stabilization algorithm for seeker is the core technology which could ensure missile tracking target, attacking target reliably and precisely.The gimbal kinematic relations of strapdown radar seeker antenna platform are discussed firstly, that antenna beam's stabilization could be affected by missile-body perturbation and cross-coupling is analyzed according to researching the kinematic relations between the gimbals of strapdown radar seeker antenna platform, then the essentiality to study the strapdown decoupling algorithm for radar seeker is explained. The digital strapdown stabilization algorithm for missile which achieved with multi-coordinate transformation is put forward by comparing and analyzing the domestic strapdown seeker decoupling technologies. At last, on the basic of researching the digital strapdown stabilization algorithm, the target line-of-sight rate which is used for partial navigation is estimated with the information of angle Kalman filtering and velocity Kalman filtering, the system error is diminished effectively by reestimating the tracking object's error angle with the information of angle Kalman filtering. The simulation results indicate that: comparing with the traditional angular speed stabilization algorithm and angular position stabilization algorithm, the antenna stabilization of strapdown radar seeker could be kept better with the digital strapdown stabilization algorithm for missile which achieved with multi-coordinate transformation, and the system random error is also diminished evidently by estimating the target line-of-sight rate with the information of angle Kalman filtering and velocity Kalman filtering.The strapdown stabilization algorithm for radar seeker is studied in the paper, which also providing some reference and practical value in further strapdown decoupling technology study.