| 硬X射线调制望远镜直接解调成像方法快速实现 |
| |
| 引用本文： | 张慧滔,张朋,宋黎明.硬X射线调制望远镜直接解调成像方法快速实现[J].CT理论与应用研究,2005,14(1):17-23. |
| |
| 作者姓名： | 张慧滔 张朋 宋黎明 |
| |
| 作者单位： | 首都师范大学数学系,北京,100037;中国科学院高能物理研究所,北京,100049 |
| |
| 基金项目： | 国家重点基础研究计划（G20000776）资助. |
| |
| 摘 要： | 针对硬X射线巡天望远镜具有的18个探测器的设计，本文给出了直接解调成像方法快速实现的两个途径。一是根据点扩展函数值中有大量零元的事实，给出了基于点扩展函数值的非零元的Lucy迭代计算和存储方法：二是将直接解调成像方法中Lucy迭代改为观测数据按一定方式分组排序的Lucy迭代。数据实验表明，本文方法大幅度提高了直接解调成像的速度。
|
| 关 键 词： | 直接解调成像方法 硬X射线巡天望远镜 Lucy迭代 分组Lucy迭代 点扩展函数 |
| 文章编号： | 1004-4140（2005）01-0007-07 |
| 收稿时间： | 2005-01-15 |
| 修稿时间： | 2005年1月15日 |
Fast Implementation of Direct Demodulation Imaging Method for HXMT |
| |
| ZHANG Hui-tao,ZHANG Peng,SONG Li-ming.Fast Implementation of Direct Demodulation Imaging Method for HXMT[J].Computerized Tomography Theory and Applications,2005,14(1):17-23. |
| |
| Authors: | ZHANG Hui-tao ZHANG Peng SONG Li-ming |
| |
| Institution: | 1 Deparlment of Mathemalics, Capital Normal University, Beijing 100037,China;2. Institute of High Energy Physics Chinese Academy of Sciences, Beijing 100049,China |
| |
| Abstract: | According to the design in which there are 18 detectors in Hard X-ray Modulation Telescope system of astronomical satellite, the authors propose two ways to fast implementation of the direct demodulation imaging method. One is calculation and storage method for Lucy iteration based on nonzero elements of point spread function of detector collimator, according to the fact that there are a large number of zero elements in point spread function. The other is to substitute Lucy iteration on the ordered subsets of observed data for Lucy iteration on all data in the direct demodulation imaging method. The numerical experiment results show that the imaging convergent speed of the direct demodulation imaging method is accelerated dramatically using the ways proposed in the present paper. |
| |
| Keywords: | direct demodulation imaging method hard x-ray modulation telescope(HXMT) lucy iteration order subset Lucy iteration point spread function |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ |
