介绍了目前人们对非晶硅表面钝化本质的认识在半导体物理方面多限于钝化后硅片少子寿命的提高以及由此推算所得表面复合速率的大小,认为这还不能清晰解答钝化作用的本质,因为钝化薄膜的作用包括对悬挂键的减少以及表面固定电荷的变化等多种机制.
针对航天器内部多障碍物阻隔,复杂无线电干扰的定位环境,以及精确定位的需求,以Cricket技术为基础设计一套结构简洁、测量精度高、信息保密性好、以及抗干扰力强的超声波定位方案.本定位方案在航天器内部放置空间位置已知的参考点与空间位置未知的待定点构成参考平面,在参考平面的基础上建立相应的三维空间坐标系,驱动参考点同时向待定点发出红外和超声波定位信号,采取时间差(TDOA)算法测量待定点与参考点的相对
The trade-off among individual privacy,data utility and data feature of service has been a great concern when designing and evaluating privacy preserv-ing schemes in trajectories publishing.The trajec
作为定位与导航领域最具研究前途的方向之一,协同定位正在引起越来越多的关注,而用户间相互测距是协同定位得以实现的关键因素之一.本文研究了单边往返测距(SS-TWR)和双边往返测距(DS-TWR)的测量偏差,理论分析表明,在两用户相对静止或者处于低速相对运动状态时,由上述两种方法得出的测距偏差可以忽略不计,当两者存在高速相对运动时,由运动引入的偏差不能忽略,并且速度不同,两种方法得出的偏差亦不相同.基
With the development of national marine strategic plan,the demand of underwater high-precision positioning is increasing greatly.Acoustic wave,as an information carrier,plays an important role in unde
Geomagnetism-based attitude determination is a popular method for modern small/macro satellites for availability of small form factor,low power magnetometers and their accuracy in meeting the attitude
This paper addresses the problem of building the X-ray pulsar timing model that is an essential work for X-ray pulsar navigation(XNAV).We propose a theoretical discussion of the differences between th
With the development of underwater passive navigation in recent years,gravity or gravity gradient matching navigation are utilized to correct the accumulated navigation errors of inertial navigation s
X-Ray pulsar navigation is a new technology for astronavigation.Its an effective supplement to the satellite navigation which is widely used at present.It can provide autonomous navigation services fo
A spoofer localization algorithm using information fusion based on the particle filter(PF)is proposed.There are many researches about the jammer localization,but less researches about the spoofer loca