Airborne synthetic aperture radar (SAR) imaging requires high speed data rate to measure the instantaneous motion information of the antenna in order to make the SAR motion compensation.High precision
利用光纤进行时间传递的方法以其结构简单,所需成本低及在抗干扰能力等方面的优势,引起了多个国家及其研究机构的重视.国家授时中心作为授时,守时的研究机构,于2003年开始对光纤时间传递进行了大量的研究.本文将介绍国家授时中心的112Km光纤时间项目的实际工程进展,该工程利用自主研制的工程样机,在临潼—西安—临潼之间实地埋设112Km光纤上,进行工程化的实验和研究.该工程在环回法的基础上,利用时分复用和
The bottleneck of Precise Point Positioning(PPP)is the long convergence time for achieving the centimeter accuracy.Some researchers put forward to improve the diversity of available satellitesgeometri
The integrated wide-area differential system of BDS broadcasts differential corrections to compensate broadcast ephemeris errors and enhance user positioning accuracy.
The demand for lower priced precise positioning is growing rapidly,as evident in the areas of intelligent transportation systems,precise agriculture and unmanned aerial vehicle(UAV)guidance.
Significant initialization or convergence time of PPP is a limiting factor for many applications.Recent studies have indicated that external ionospheric information can be applied to provide a tight c
Aiming at the problem that that pedestrian can only get low accuracy and plane coordinate of current indoor localization from intelligent terminal,a layered indoor 3D positioning technology based on W
Improving the dynamic performance and signal acquisition performance of BDS receiver aided by INS is the hot spot of the current navigation research.Through the comparison between fundamentals of trad
Although the LBS applications benefit the public,there are lawless users trying to make profit from LBS deception.A deception identification method for smart phone based on the speed consistency of se
Ambiguity resolution is the key to achieve rapid and accurate positioning,which is always the focus of GNSS research.The Beidou navigation system provides triple-frequency signals,which can be combine