搜索结果: 1-11 共查到“航天器结构与设计 GNSS”相关记录11条 . 查询时间(0.132 秒)
Satellite Based Augmentation Systems (SBAS) are now being implemented around the world in order to improve the accuracy and integrity of Global Navigation Satellite Systems (GNSS). One of these is the...
Worldwide Trends in GNSS Development and their Implications for Civil User Performance and Safety
Worldwide Trends GNSS Development Civil User Performance Safety
2015/6/25
This paper examines the trends that are apparent in the worldwide development of Global Navigation Satellite Systems (GNSS) and how they will affect the growing population of civil users of satellite-...
Testing of Adaptive Beamsteering for Interference Rejection in GNSS Receivers
Adaptive Beamsteering Interference Rejection GNSS Receivers
2015/6/25
In this work space-time adaptive processing algorithms for interference rejection in a GNSS receiver are tested under experimental conditions with recorded signals generated by a powerful hardware sig...
Using Loran for Broadcast of Integrity Information for Modernized Global Navigation Satellite Systems (GNSS)
Using Loran Broadcast Integrity Information Modernized Global Navigation Satellite Systems (GNSS)
2015/6/25
The United States (US) Federal Aviation Administration (FAA) has been examining the potential of using an enhanced Loran (eLoran) to provide back up for aviation. The 2004 FAA Loran technical evaluati...
Characterizing Nominal Analog Signal Deformation on GNSS Signals
Analog Signal Deformation GNSS Signals
2015/6/25
Satellite-based navigation requires precise knowledge of the structure of the transmitted signals. Accurate knowledge of the shapes of the code correlation peaks is required to ensure no biases are in...
Development of a Real-time GNSS Software Receiver for Evaluating RAIM in Multi-constellation
Real-time GNSS Software Receiver Evaluating RAIM Multi-constellation
2015/6/24
As Global Navigation Satellite System continues to upgrade, there will be an increasing number of satellites upgrade, there will be an increasing number of satellites of-life users like aviation, high...
为了改进软件接收机的实时性，提出了一种新的并行相关器设计，不再采取常用的查找表方法，而是利用基于位操作的并行算法，以及处理器的SIMD（单指令多数据）指令集，分别对相关器中的乘法与求和运算进行了优化。新方法可适应各种信号量化位数，比现有算法性能提升4~10倍，在普通计算机上并行处理12通道的GPS L1频点信号时，处理器资源占用率不到1%。
GNSS接收机矢量跟踪算法研究综述
信号跟踪 矢量跟踪 矢量延迟/频率锁定环 极大似然矢量跟踪环
2014/5/21
GNSS接收机信号跟踪的实质是对卫星信号的扩频码延迟和载波频率偏移进行连续估计的过程。从信号跟踪的基本原理出发，综述了矢量跟踪算法的基本思想和研究历程，分析了算法中系统建模、模型参数确定和滤波器设计等关键环节，总结比较了算法的最新衍变形式，包括极大似然估计矢量跟踪环和联合矢量位置跟踪环的模型、特点和优势，通过仿真验证了矢量跟踪相比标量跟踪具有失锁重捕快、跟踪误差小和稳定性好的优点，最后总结了矢量跟...
基于双子空间跟踪及盲波束形成的GNSS抗干扰算法
全球导航卫星系统 子空间跟踪 干扰抑制 自适应波束形成
2010/8/18
根据全球导航卫星系统（Global Navigation Satellite Systems, GNSS）卫星信号粗捕获（C／A）码的相关峰特点，提出基于双子空间跟踪及盲波束形成的GNSS抗干扰算法。首先通过噪声子空间跟踪将接收信号投影到噪声子空间进行干扰抑制，提高接收信号信干比（SIR）。然后利用指定卫星C／A码与干扰抑制信号进行相关运算，增强指定卫星信号的信噪比（SNR），结合一维信号子空间跟...
Multiple Gate Delay Tracking Structures for GNSS Signals and Their Evaluation with Simulink, SystemC, and VHDL
Multiple Gate Delay Tracking Structures GNSS Signals Simulink SystemC VHDL
2009/9/3
Accurate delay tracking in multipath environments is one of the prerequisites of modern GNSS receivers. Several solutions have been proposed in the literature, both feedback and feedforward. However, ...
Experiences Gained during the Development of a Passive BSAR with GNSS Transmitters of Opportunity
Experiences Gained Passive BSAR GNSS Transmitters Opportunity
2009/9/3
This paper presents an overview of the research conducted at University of Birmingham. It highlights and briefly discusses various systems parameters (e.g., resolution, power budget), problems (e.g., ...