IMPLEMENTATION AND ANALYSIS OF TARGET TRACKER IN FIRE CONTROL SYSTEM

For a fire control system with a GPS sensor, an inertial measurement unit, and a range laser, two different nonlinear implementations of the target tracking filter, namely the Sigma Eta filter and the square root filter, have been investigated. The filter estimates the position and velocity of a moving target relative to the reticle platform, based on which the reticle commands to engage the target are determined. The Sigma Eta filter is computationally efficient, while the square root filter is inherently robust. The square root filter is proposed to compensate for the numerical instability of the Sigma Eta filter. The performance of these filters is compared through a simulation example.