Abstract
In recent years, applications such as marine search and rescue, border patrol, etc. require electro-optical equipment to have both high resolution and precise geographic positioning abilities. The step and stare working based on a composite control system is a preferred solution. This paper proposed a step and stare system composed of two single-axis fast steering mirrors and a two-axis gimbal. The fast steering mirrors (FSMs) realize image motion compensation and the gimbal completes pointing control. The working principle and the working mode of the system are described first. According to the imaging optical path, the algorithm and control flow of the line of sight (LOS) and image motion compensation are developed. The proposed method is verified through ground imaging and flight tests. Under the condition of flight, the pointing accuracy of the target can be controlled within 15 m. The proposed algorithm can achieve effective motion compensation and get high-resolution images. This achieves high resolution and accurate LOS simultaneously.
Highlights
Electro-optic/infrared imaging systems with high resolution, wide area, and accurate geo-positioning characteristics are required for search and rescue, border and coastal patrol, and other applications
The way of using two-axis or multi-axis gimbals to achieve stabilization of the line of sight (LOS) is described in many early documents [4,5,6,7,8,9].With the emergence and development of fast steering mirrors, the literature began to use the fast steering mirrors(FSMs) with two-axis gimbals to realize the composite systems to achieve more accurate and fast stabilization of LOS
The gimbal subsystem keeps the LOS stable, and FSMs compensate according to the real-time velocities
Summary
Electro-optic/infrared imaging systems with high resolution, wide area, and accurate geo-positioning characteristics are required for search and rescue, border and coastal patrol, and other applications. The way of using two-axis or multi-axis gimbals to achieve stabilization of the LOS is described in many early documents [4,5,6,7,8,9].With the emergence and development of fast steering mirrors, the literature began to use the fast steering mirrors(FSMs) with two-axis gimbals to realize the composite systems to achieve more accurate and fast stabilization of LOS Most of these systems focus on the tracking system and pay more attention to the stabilization accuracy of the LOS of the system rather than the imaging resolution [10,11,12,13]. We will focus this paper on LOS and image motion compensation for step and stare imaging system which uses two-axis gimbal with two single-axis steering mirrors.
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