我国成功地参与阿尔法磁谱仪的研制

我国成功地参与阿尔法磁谱仪的研制中国运载火箭技术研究院总体设计部朱维增１９９５年１０月，美国国家能源部与美国航宇局正式批准了由美籍华裔著名物理学家丁肇中教授领导的阿尔法磁谱仪研究计划。阿尔法磁谱仪简称ＡＭＳ，用于探测宇宙中的反物质及暗物质。计划在１９...     

印将探月时间提前一年

由于其投资1亿美元的月球轨道探测器计划进展迅速,深受鼓舞的印度空间研究组织已把该无人探月器的发射时间提前一年,即从2008年提前到2007年,甚至有可能更早。称为“月船”1号的该探测器主要任务之一是寻找月球上的聚变燃料氦3。在为期两年的探测中,它将获取月面高分辨率的地质、矿物学和地形测量图。该项目一位负责人称,新的发射日期是切合实际的,因为火箭和探测器本体基本上都是现成的,有效载荷的制造工作也已启动。他说,该探测器将以印度2002年9月发射的“气象卫星”所用的平台为基础,设计配置将在3月底冻结,实验有效载荷也将在年底前冻…     

进近雷达管制中科学上升下降高度的探讨

随着中国经济的持续高速发展,中国由一个航空落后国家已经发展成为一个运输总量跃居世界前列的航空大国,并且正在为发展成为民航强国而努力奋斗,我们的硬件设备和人员都在快速的更新和壮大,很多地方甚至拥有了连发达国家都垂涎的先进设备,但我们的配套软件的更新发展速度却远远地落后于硬件的发展,使先进的设备没能发挥它应有的最大效能。     

METHOD FOR DETECTING AND REPAIRING CYCLE SLIPS IN GPS NAVIGATION

A new method is proposed for detecting and repairing cycle slips in GPS navigation based on the dual frequency observations. It can be implemented through the following three steps: (1) The integer ambiguities of the current epoch are substituted by that of the previous epoch, so the ambiguity parameters are removed from the observation equations. (2) The abnormal observations are detected using the quasi accurate detection (QUAD) method and the satellite pairs of these abnormal observations are determined. Then the coefficient matrix of these satellite pairs is recovered. (3) The cycle slips of these satellite pairs are calculated using the LAMBDA method and integer ambiguities of the current epoch can be determined by adding the cycle slips into the integer ambiguities of the previous epoch. The key of this method is that the abnormal observations must accurately he detected, i.e. , the satellites having cycle slips must correctly be judged. Finally, compared with other methods the feasibility of the method is verified.