Collation of biaxial and triaxial passive optical target seeker gyroscopic stabilization systems

Due to passive method of target detection and built-in gyro stabilization system (which greatly increase the whole accuracy) passive optical target seeker (TS) is widely adopted in aircraft and anti-aircraft missiles.

For TS based on matrix IR-detector the triaxial stabilizer (with additional roll control channel) is hold much more promise than the traditional biaxial one.

Collation of bi- and triaxial stabilizers was realized with use of dynamic simulation. TS-s dynamic model includes ones: stabilization system (bi- or triaxial), servo drives based on torque electro motors, IR-detector channel, missile-s body oscillations and relative motion «missile-to-target».

TS-s stabilization system model is designed using Lagrange equations which allow to make a more detail research of how the missile body oscillations effect on TS accuracy.

According to dynamic simulation results missile body oscillations with only amplitude 1° and frequency 1 Hz cause critical image blurring and target-s signal decreasing in biaxial TS.

Moreover, in case nonzero missile observed bearing the biaxial TS measurement error is also increasing. For example, if missile ob-served bearing is equal to 2-3° the measurement error of line of sight angular velocity rises twice and detection range may reduce to 30-40%.

On another side, triaxial TS holds minimal stabilization derivations and measurement errors and successfully blocks image blurring in case different levels rolling oscillations.