Design of instantaneous field of view of the rosette scanning infrared seeker and dynamic simulation

摘要

A rosette scanning IR seeker is the device mounted on the IR guided missile. It offers the positions and images of target to missiles' servo system by scanning a total field of view (TFOV) in a rosette pattern with a single detector. An instantaneous field of view (IFOV) is a diameter of the detector moving along the path of the rosette pattern. The IFOV has the property that its smaller size provides the less interference of background signals and detector noise. If its size is too small to cover the TFOV, however, it produces the invisible regions in the TFOV and decreases the performance of the seeker. For full scan coverage, it is necessary to design the small IFOV without the invisible regions as possible. In this paper, we propose a new method to design the smaller IFOV than the conventional one. The IFOV of the proposed method is defined as a distance between two points, which are selected among the intersected points between any petal and its neighbors. By comparing a noise equivalent flux density of the proposed method with that of the conventional, we confirm that the former is better than the latter in terms of performance. To evaluate the designed IFOV dynamically, we simulate the rosette scanning IR seeker using MATLAB-SIMULINK.