bstract—Polar coordinates-orthogonal coordinates quantization value is decided according to the radar
conversion needs to be solved in radar PPI signal　displaying. Traditional coordinate conversion needs a large　deal of calculation and high standard of computer main　frequency and memory, and can not meet requirement of　real-time processing of system. In this paper we propose a　new look-up table increment method, to create a twodimensional　array whose indexes are azimuth and distance　in polar coordinates and whose content is composed of　corresponding rectangular coordinate points , which has　not only high-speed calculation but also high display　accuracy.