雷达作为舰船的导航和定位设备已有近半个世纪的历史。随着电子技术的发展,雷达的技术性能和使用性能有很大提高。但是,传统的PPI显示方式的致命缺点是其显示图像的亮度太低,特别在低量程时更为明显,这一直是使生产厂和用户都感到棘手的问题。我们知道,PPI雷达的图像是通过距离径向扫描和方位(圆周)扫描来形成的。距离扫描的速率随量程 Radar as navigational and positioning equipment for ships has been nearly half a century of history. With the development of electronic technology, the technical performance and use performance of radar have been greatly improved. However, the fatal disadvantage of the traditional PPI display method is that the brightness of the displayed image is too low, especially at low ranges, which has always been a problem for manufacturers and users. We know that the PPI radar image is formed by scanning radially and azimuthally (circularly). The distance from the scan to the range