我国北斗卫星导航系统正处于建设阶段,由区域性服务向全球服务发展.卫星导航系统主要依托地面运控支持,一旦地面运控系统因自然灾害或人为因素而遭到破坏,卫星导航系统将会陷入瘫痪,PNT服务质量将无法保证.另一方面,我国卫星导航系统无法实现全球布站,一旦卫星出境,将无法更新导航电文,而PNT服务质量变差.因此,为了增强卫星导航系统的抗打击、抗摧毁能力以及实现我国卫星导航系统全球PNT服务,卫星导航系统需具
较之大卫星,立方体卫星因其低成本和快速交付的特点促使其近些年呈指数增长态势,低轨道、快速回访、易于组网编队等优势在通信、遥感、科学和深空探测等主流应用领域逐渐崭露头角.在立方体卫星入轨初期存在姿态不稳、为获得能源对日飞行及执行任务时主动旋转等特殊飞行模式下,测控通信建立存在风险,姿态轨道控制建立需要获取初轨信息,因此依赖于GPS卫星导航系统进行导航定位.本文依托STK(System Tool Ki
The current GPS clock products are based on P1-P2 ionosphere-free (IF) observation combinations.Upon conducting single point positioning (SPP) by C1 and P2 observations,C1-P1 instrumental biases shoul
Data from previous observation have shown that the BeiDou satellite navigation system (BDS) has been suffering from satellite-induced elevation-dependent code pseudorange bias,which can be as much as
With the development of high-frequency GNSS receivers and precision positioning technology,GNSS has been one of the main observation means to obtain high precision crustal deformation information in s
In order to study the characteristics of zenith tropospheric delay (ZTD) at sea,the Precise Point Positioning (PPP) was used to process the data from 7 International GNSS Service (IGS) reference stati
Since Real-time precise point positioning (PPP) has been evolved as a powerful technique to achieve globally homogenous decimeter or even centimeter positioning accuracy,which is widely used for marit
The gyroscope based on atomic technology has the potential to provide the end user a high-performance device in a small package with low-power.Generally,the atomic gyroscope detects the rotation or an
In dynamic scenarios,the loop bandwidth of BeiDou receiver must be sufficiently wide and the integration time should be short to ensure stable tracking.
Because of the increase of water vapor content in the atmosphere or precipitation,the satellite signal prones to multipath effect,which leads to the changes of signal-to-noise ratio(SNR).