With the widely use of raster display , pixel - level algorithm becomes a research hotspot of basic algorithms of computer graphics now 随着光栅显示器的广泛使用，逐点算法成为当前图形学基础算法中的一个研究热点。
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With the widely use of raster display , pixel - level algorithm becomes a research hotspot of fundamental algorithms of computer graphics now 随着光栅显示器的广泛使用，逐点算法已成为目前图形学基础算法中的一个研究热点。
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Targets in the radar ppi have the main property of the little area , a few targets and irregular change of grey . so it is difficulty to detect and track the target . the study of the radar ppi is very few inland and abroad . with the development and implement of high resolution radar and high resolution raster display , target _ tracking and detecitng based on the radar ppi will be feasible . it ' s great excellence is to increase time accumulation compare with the detecting techenicial of the traditional radar 雷达ppi中目标的特点是面积小，目标或可能的目标多，灰度、形状变化无明显规律，所以检测和跟踪目标比较困难。基于雷达ppi的研究国内外甚少，随着高分辨率雷达和高分辨光栅显示器的发展，基于ppi的雷达目标检测和跟踪成为可能。与传统的雷达目标检测技术相比，其潜在的优势在于大大增加了信号的时间积累，因此有可能提高检测性能。
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