北京航空航天大学学报 ›› 2011, Vol. 37 ›› Issue (8): 1026-1029.

• 论文 • 上一篇    下一篇

软件雷达基于改进CORDIC算法的坐标变换

夏栋1, 察豪1, 周沫1, 黄瑛2   

  1. 1. 海军工程大学 海洋电磁环境研究所,武汉 430033;
    2. 解放军理工大学 工程兵工程学院,南京 210007
  • 收稿日期:2010-07-14 出版日期:2011-08-30 发布日期:2011-09-03
  • 作者简介:夏 栋(1983-),男,山东临朐人,博士生,xcdo@163.com.

Coordinates conversion of software radar based on improved CORDIC algorithm

Xia Dong1, Cha Hao1, Zhou Mo1, Huang Ying2   

  1. 1. Institute of Ocean Electromagnetic Environment, Naval University of Engineering, Wuhan 430033, China;
    2. Engineering Institute of Engineer Corps, PLA University of Science and Technology, Nanjing 210007, China
  • Received:2010-07-14 Online:2011-08-30 Published:2011-09-03

摘要: 利用通用计算机软件化实现雷达数据处理和终端显示已成为一种趋势,而从极坐标到直角坐标的快速变换是保证雷达实时显示的前提.在雷达显示过程中角度数据随时间均匀变化,每增加同一个微小的值可得到下一个角度.通过合理选择角度增量使其在满足雷达显示的前提下同时符合CORDIC(Coordinate Rotation Digital Computer)算法的要求,并据此对CORDIC算法进行了改进.改进后的CORDIC算法只需1次偏转就可计算出需要的三角函数值,提高了从极坐标变换到直角坐标的速度.经过分析,改进后的算法使得坐标变换的速度比原来提高了15倍.

Abstract: Radar data processing and terminal display realized by software on general-purpose computer becomes a trend now. And fast conversion from polar coordinates to orthogonal coordinates is required in real-time radar-s display. The value of azimuth angle increases evenly in radar display processing, and the next azimuth angle value can be got by the same tiny increment added to the current value. An appropriate increment was selected to satisfy the coordinate rotation digital computer(CORDIC) algorithm-s demand as well as meet the need of radar display. And based on above, the CORDIC algorithm was improved. The improved CORDIC algorithm can calculate the trigonometric function only by one rotation, which accelerates the speed of conversion from polar coordinates to orthogonal coordinates. Though analysis, the improved algorithm is 15 times faster than the original algorithm.

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