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Extended Risley scanning system with 30 × 360 coverage.

We propose a beam scanning system based on an extended Risley prism structure. This system uses a rotating mirror structure and expands the original construction of the balanced and stable Risley prism. There is much research on extended Risley prism structures, but the scanned angle of their extended systems is less than 180°. The proposed system in this paper can expand scanned angle to 360°, showing practical significance and application value in the field of beam scanning. This is achieved by using reflectors and multiple transmitter and receiver structures with optimized positions and transmission directions. Simulation results show that the scanning range is 360° and ±14∘ in the horizontal and vertical directions, respectively, at 110 m while the angular resolution is 0.2∘×2∘.