项目名称: 射电干涉测量中高精度VLBI时延改正和DOR时延模型研究
项目编号: No.11303077
项目类型: 青年科学基金项目
立项/批准年度: 2014
项目学科: 数理科学和化学
项目作者: 黄逸丹
作者单位: 中国科学院上海天文台
项目金额: 30万元
中文摘要: 我国深空探测战略按月球探测、行星际探测两大主线来开展探测活动。国内甚长基线干涉测量(VLBI)在月球探测中为航天器的关键飞行段导航提供了高精度的定轨定位支持。但嫦娥项目中的VLBI时延模型精度仅为1ns量级,不能满足未来深空探测的要求,本项目将研究VLBI时延模型精度提高到0.01ns量级的方法,包括测站固体潮改正;适用于我国近海测站的海潮负荷改正;高精度的大气时延改正;适用于球面波的航天器时延改正。 为了面对将来深空探测应用的需要,对较差单程差分测距(Delta-DOR)新技术的理论时延研究也是本项目的重点之一。该技术在国外的深空探测项目中已得到有效应用,目前对此技术国内还处在探索和研究阶段。本项目将开展对DOR理论时延模型的系统研究,包括DOR时延模型的算法、仿真及验证,以及与VLBI时延的联系及相互转换。 成果可用于未来月球、火星、金星等深空探测器的射电干涉测量。
中文关键词: DOR;VLBI;时延模型;深空探测;本地相关技术
英文摘要: Lunar exploration and interplanetary exploration are the two main lines of Chinese deep space exploration strategy. Radio interferometry technology(Very long baseline interferometry, VLBI) has played an important role in critical flight navigation of Chang'E missions. However,the accuracy of VLBI time delay model currently used in the Chang'E missions is just at the level of 1 nannosecond(ns), which cannot satisfy the requirment of the following deep space exploraions. The goal of this project is to improve the accuracy of VLBI time delay up to the level of 0.01 ns.The methods include modeling more precise corrections of station position,atmospheric delay and time delay caused by spherical wave . Delta Differential One-way Range(Delta-DOR) is a new technique in deep-space radio interferometry derived from VLBI. This research work in the project contains the definition, algorithm, simulation and verification of the DOR time delay model. The difference and transformation between the DOR delay and the VLBI delay will also be analysed and discussed. This research will be beneficial for the Lunar, Mars and Venus deep-space exploration in the future.
英文关键词: DOR;VLBI;time delay model;deep space exploration;local correlation technology