【摘 要】
：
Dual Estimation Technique(DET)is mainly used to achieve unambiguous tracking of high-order BOC signals.DET has a good tracking performance,but its anti-multipath performance need to be further improve
【机 构】
：
Tsinghua university,100084,Beijing,china;Beijing Institute Of Satellite Information Engineering,Zhic
论文部分内容阅读
Dual Estimation Technique(DET)is mainly used to achieve unambiguous tracking of high-order BOC signals.DET has a good tracking performance,but its anti-multipath performance need to be further improved.In this paper,the method of designing a synthesized correlation function(SCF)based on step-shape code symbol(SCS)is applied to the DET.Anti-multipath performance of DET is improved by introducing the special SCS signal to participate in the coherent integration process with the received signal.
其他文献
针对输变电设备监测智能传感器存在的电源供给问题，本文通过融合多种能量收集技术研制了传感器电源系统。通过理论分析和实验室环境模拟实验分别对温差热能、振动机械能、磁场能这几种能量形式的特性进行了研究，搭建了能量综合管理系统，并对其进行了仿真和实验研究，实现了多种异构能量形式的混合接入，最后采用Zigbee无线传感网络节点进行了带载仿真试验，验证了所提出的多元能量收集方案能够向智能传感器这类应用提供稳定
由于制造工艺、水分和脏污等因素的影响，管型母线在变电站长期运行时容易出现绝缘缺陷，而目前对于管母的状态评估主要依靠带电测试。因此，本文以深圳地区某220kV变电站主变变低管型母线缺陷试验为例，综合分析了红外测温、紫外成像以及局部放电检测的有效性。结果表明，红外测温作为一种常规而普遍的带电测试手段，最能及时有效发现管型母线的缺陷，紫外成像和局部放电检测则可帮助于确诊缺陷，并针对不同的缺陷类型评估放电
本文设计并实现了将卫星导航信号进行采集存储的系统,可用于提供真实的卫星导航信号原始数据.系统采用MAX2112芯片作为射频前端芯片,通过STM32配置前端芯片实现对不同导航系统的卫星信号的采集,射频芯片将射频信号分I/Q两路进行下变频,采用MAX1003芯片将中频信号转换为数字信号,控制传输模块基于FPGA+FIFO+USB3.0的设计方案,通过上位机程序直接将采集的卫星信号存储在PC机中.测试结
在室内环境中,接收机接收信号衰减严重甚至出现频率阶跃的情况,传统接收机跟踪环路无法稳定跟踪,从而影响接收机的最终定位精度.针对上述问题,本文提出了一种基于自适应权值调整的载波跟踪方法.根据动态门限,自适应地调整鉴频值和鉴相值的权值,将调整后的鉴频值和鉴相值作为观测误差矢量,采用卡尔曼滤波器替代传统的载波环路滤波器,建立新型的二阶锁频环辅助三阶锁相环的载波跟踪环模型.仿真结果表明,在弱信号环境下,该
研究了一种新的卫星导航接收机导航电文解调算法——BASS(同步块信号调整)方法.通过分析卫星导航信号有用DFT分量的相角获得载波的精细频率和与导航电文信息,在方法实现的过程中考虑了核函数相角不连续的原因并作了补偿,最后用仿真和实际信号分别对该方法进行验证并与传统锁相环方法比较,结果表明:BASS算法捕获频率精度可达10HZ,能有效输出导航电文信息.
The traditional satellite navigation and positioning technology uses a number of satellites to locate,for example,GPS and BDS use four satellites to locate.However,in some special cases,when GPS or BD
The improvement of low-cost receiver performance and the development of Multi-GNSS will make high-precision dynamic positioning,which is for the general public,become the main growth point of GNSS app
Three QZSS satellites are launched in 2017,which implies that a four satellites regional system is to be established in 2018.There is no doubt that QZSS will play a more important role in the future g
The development of multi-GNSS remarkably increased the number of available satellites,but how to solve the multi-dimensional ambiguity parameters quickly and accurately in network RTK technology is st
Positioning precision of navigation satellite system can be measured by two indicators: the dilution of precision(DOP)and the user equivalent range error(UERE).As the DOP values are only related to th