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Reconstruction of sub cross-correlation cancellation technique for unambiguous acquisition of BOC(kn, n) signals

Journal of Systems Engineering and Electronics 2019年第5期30卷 852-860页

作者： ji yuanfa CHEN Xiaoqian FU Qiang SUN Xiyan ZHEN Weimin Guangxi Key Laboratory of Precision Navigation Technology and Application Guilin University of Electronic TechnologyGuilin 541004China National&Local Joint Engineering Research Center of Satellite Navigation Positioning and Location Service Guilin 541004China Key Laboratory of Radio Wave Environment and Modeling Technology Qingdao 266000China

In order to solve the problem of ambiguous acquisition of BOC signals caused by its property of multiple peaks,an unambiguous acquisition algorithm named reconstruction of sub cross-correlation cancellation technique(RSCCT)for BOC(kn,n)signals is *** this paper,the principle of signal decomposition is combined with the traditional acquisition algorithm structure,and then based on the method of reconstructing the correlation *** method firstly gets the sub-pseudorandom noise(PRN)code by decomposing the local PRN code,then uses BOC(kn,n)and the sub-PRN code cross-correlation to get the sub cross-correlation ***,the correlation peak with a single peak is obtained by reconstructing the sub cross-correlation function so that the ambiguities of BOC acquisition are *** simulation shows that RSCCT can completely eliminate the side peaks of BOC(kn,n)group signals while maintaining the narrow correlation of BOC,and its computational complexity is equivalent to sub carrier phase cancellation(SCPC)and autocorrelation side-peak cancellation technique(ASPeCT),and it reduces the computational complexity relative to *** BOC(n,n),the acquisition sensitivity of RSCCT is 3.25 dB,0.81 dB and 0.25 dB higher than binary phase shift keying(BPSK)-like,SCPC and ASPeCT at the acquisition probability of 90%,*** peak to average power ratio is 1.91,3.0 and 3.7 times higher than ASPeCT,SCPC and BPSK-like at SNR=–20 dB,*** BOC(2n,n),the acquisition sensitivity of RSCCT is 5.5 dB,1.25 dB and 2.69 dB higher than BPSK-like,SCPC and ASPeCT at the acquisition probability of 90%,*** peak to average power ratio is 1.02,1.68 and 2.12 times higher than ASPeCT,SCPC and BPSK-like at SNR=–20 dB,respectively.

关键词： signal decomposition sub cross-correlation reconstructingcorrelation function acquisition performance

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A New Algorithm of Energy Suppression for Satellite Navigation

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Geo-Spatial Information Science 2010年第1期13卷 65-69页

作者： ji yuanfa SUN Xiyan Satellite Navigation Lab Guilin University of Electronic Technology 1 Jinji Road Guilin 541004 China National Astronomical Observatory Datun Road Beijing 100012 China

The satellite navigation anti-interference technique, especially space anti-interference technique, is subjected to many restrictions, such as cost, energy depletion, and so on, and the satellite signal strength is limited by the International Radio Advisory Committee, the International Telecommunication Union (ITU) and satellite companies. This paper focuses on satellite navigation systems, especially satellite navigation systems adopting direct sequence spread spectrum (DSSS). The notch filter is used to remove some frequencies from the pseudorandom code frequency spectrum making use of its cyclostationarity first, then the filtered pseudorandom code is modulated by the carrier to attain energy suppression, but the pseudorandom code autocorrelation characteristic stays unchanged. The feasibility of this algorithm is verified by simulation results.

关键词： satellite navigation CA code anti- interference notch filter cyclostationarity parasitizing

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Interpolation Fitting Algorithm in Time-Space Domain of Differential Barometric Altimetry

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Journal of Beijing Institute of Technology 2019年第1期28卷 119-128页

作者： Zhengqun Hu Lirong Zhang Guanyi Ma yuanfa ji National Astronomical Observatories Chinese Academy of Sciences Key Laboratory of Cognitive Radio and Information Processing Ministry of EducationGuilin University of Electronic Technology Guangxi Key Laboratory of Precision Navigation Technology and Application

In order to overcome the limitations of a unitary reference station in mobile communication positioning network differential barometric altimetry(DBA)and broaden the action scope of the reference station and improve positioning accuracy of elevation,an integrated interpolation algorithm model based on generalized extended approximation(GEA)algorithm and Kriging interpolation in time-space domain of reference station is *** the time domain,barometric measured data is considered the maximum value estimated by bilateral extension to avoid wrong direction of estimation,which is approaching true *** the spatial domain,barometric relevance among multiple reference stations is utilized,the weighted coefficients of multiple reference stations is calculated by the integrated algorithm model based on the GEA algorithm and Kriging *** impact of each reference station to the measured station is quantified,so that a virtual reference station is constructed,which can overcome the limitation of barometric correction by a unitary reference *** addition,the measurement error due to irregular change in atmospheric pressure will be eliminated.

关键词： differential barometric altimetry(DBA) multi reference station generalized extended approximation(GEA) Kriging algorithm

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Analysis on the positioning precision of CAPS

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Science China(Physics,Mechanics & Astronomy) 2009年第3期52卷 328-332页

作者： ji yuanfa1,2 & SUN XiYan1,2 1 National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China 2 Applied Science and Technology College, Guilin University of Electronic Technology, Guilin 541004, China 1. National Astronomical Observatories Chinese Academy of Sciences Beijing 100012 China 2. Applied Science and Technology College Guilin University of Electronic Technology Guilin 541004 China

As a newly developed satellite positioning system, the Chinese Area Positioning System (CAPS) is a typical direct sequence spread spectrum ranging system like GPS. The positioning precision of such navigation signals depends on many factors, including the pseudo-code rate, the signal to noise ratio, the processing methods for tracking loops and so on. This paper describes the CAPS link budget, the solution approach for CAPS positioning, focusing on the autocorrelation function feature of C/A code signals. The CAPS signal measurement precision is studied by the software approach together with theoretical analysis of the range resolution. Because the conventional Delay Lock Loop (DLL) is vul- nerable to the impact of noise, a narrow correlator and multiple correlators as well as the corresponding discrimination methods of phases are proposed, which improves the robustness of DLL and the code-phase resolution of the measurement. The results show that the improvement of the DLL structure and the discrimination method are the most important way to improve the ranging resolution. Theoretical analysis and experimental results show that a CAPS receiver could reach a 20-m positioning precision by using three satellites with a supported height from an altimeter.

关键词： satellite navigation receiver narrow correlation tracking loop

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卫星导航中一种新的能量压缩算法

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武汉理工大学学报（交通科学与工程版） 2009年第5期33卷 952-955页

作者：纪元法桂林电子科技大学应用科技学院桂林541004 中国科学院国家天文台北京100012

针对卫星导航系统,特别是采用直接序列扩频的卫星导航系统,利用其循环平稳特性,采用陷波滤波器滤除伪随机码频谱中一些频率,然后再用载波调制信号.信号处理后卫星导航信号的能量大大降低,而伪随机码与本地码的相关特性保持不变,即,码测... 详细信息

针对卫星导航系统,特别是采用直接序列扩频的卫星导航系统,利用其循环平稳特性,采用陷波滤波器滤除伪随机码频谱中一些频率,然后再用载波调制信号.信号处理后卫星导航信号的能量大大降低,而伪随机码与本地码的相关特性保持不变,即,码测距精度不变.这种处理后的弱卫星导航信号可以寄生在其它卫星,而不被发现,从根本上提高了系统的抗干扰能力.最后并通过仿真验证了方法的可行性.

关键词：卫星导航 CA码抗干扰陷波滤波器循环平稳寄生

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An unfuzzy acquisition algorithm based on matched filtering for BOC(n,n)

An unfuzzy acquisition algorithm based on matched filtering ...

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第九届中国卫星导航学术年会

作者： Xiyan SU Fang HAO yuanfa ji Weimin ZHEN Baoguo YU Xingli GAN Guangxi Key Laboratory of Precision Navigation Technology and Application Guilin University of Electronic Technology State key laboratory of satellite navigation system and equipment technology Key Laboratory of radio wave environment and modeling technology

Due to ambiguous acquisition caused by multiple peaks of auto-correlation function(ACF) of Binary Offset Carrier(BOC) modulation technology,an Odd-even Correlation Side-peak Cancellation Technology(OCSCT) is proposed in this *** side-peak elimination is obtained by multiplying and transforming the odd-even branch and received *** order to make full use of the received signals and further improve the acquisition performance,a corresponding optimization algorithm is put *** methods of BPSK-LIKE,ASPe CT and this paper are analyzed and *** results show that the proposed side-peak elimination method can effectively solve the acquisition ambiguity problem,and reduce the span of the main peak to half a chip,which further improves the acquisition *** with the ASPe CT method,the acquisition sensitivity,and the peak to average ratio is increased by 2 dB,10%,*** the calculation amount is reduced by about 50.11%.

关键词： Satellite navigation Binary Offset Carrier Unambiguous acquisition Side-peak elimination half chip

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同步轨道卫星实时测定轨方法

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清华大学学报（自然科学版） 2007年第z2期47卷 1914-1918页

作者：孙希延纪元法施浒立中国科学院国家天文台

同步轨道卫星由于其"静止"特性,用多台站时间比对技术精确测定地面站到卫星间的伪距。而在以伪距为观测量的测定轨中,观测方程和动力学方程都是非线性的。为了避免线性化方程带来的误差,并满足实时性要求,该文提出用无味Kalman滤波(unsc... 详细信息

同步轨道卫星由于其"静止"特性,用多台站时间比对技术精确测定地面站到卫星间的伪距。而在以伪距为观测量的测定轨中,观测方程和动力学方程都是非线性的。为了避免线性化方程带来的误差,并满足实时性要求,该文提出用无味Kalman滤波(unscented Kalman filtering,UKF)法。实验是用5个距离拉开的测轨站采集的实测数据,并通过计算机仿真验证,仿真结果表明UKF法测定轨结果随机误差明显减小,而且满足实时性要求。

关键词：同步轨道卫星无味Kalmn滤波(unscented Kalman filtering,UKF) 时间比对伪距

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采用相关曲线偏差的导航卫星多径信号分离方法

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西安交通大学学报 2017年第2期51卷 65-71页

作者：袁赫良金天杨茜纪元法北京航空航天大学电子信息工程学院北京100191 广西精密导航技术与应用重点实验室广西桂林541004

为解决卫星导航信号中提取多径分量困难的问题,提出了一种利用相关曲线偏差(SCB)分离导航卫星多径信号的方法(MSCB)。首先建立包含多径分量的接收信号模型;然后分析SCB偏差与多径信号幅值、延迟与相位之间的关系,得到不同多径延迟条件... 详细信息

为解决卫星导航信号中提取多径分量困难的问题,提出了一种利用相关曲线偏差(SCB)分离导航卫星多径信号的方法(MSCB)。首先建立包含多径分量的接收信号模型;然后分析SCB偏差与多径信号幅值、延迟与相位之间的关系,得到不同多径延迟条件下两种不同的SCB偏差形状;最后通过SCB拐点估计出多径信号参数。基于北斗和GPS导航卫星的实验结果表明:MSCB方法能够有效地将来自地面与卫星自身的多径分量(或类似多径分量)特征参数提取出来,将多径分辨率从米级提高到分米甚至厘米级别,其估计标准差仅为传统多径估计延迟锁定环路算法的1/6左右,为未来多径信号的建模与分析提供了一种新的有效方法。

关键词：卫星导航多径信号相关曲线偏差北斗

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车载动中通信标跟踪的广义延拓逼近算法

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西安电子科技大学学报 2017年第4期44卷 112-117页

作者：张志富裴军胡超纪元法中国科学院国家天文台北京100012 中国科学院大学北京100049 广西精密导航技术与应用重点实验室广西桂林541004

为了提高车载动中通系统对卫星信标信号的频率跟踪精度,提出了利用一元广义延拓逼近实现锁频环鉴频器的算法.该算法通过对卫星信标信号功率谱样点域进行单元划分,在保证样点域节点处满足插值条件的前提下,实现单元域内的最佳拟合,能够... 详细信息

为了提高车载动中通系统对卫星信标信号的频率跟踪精度,提出了利用一元广义延拓逼近实现锁频环鉴频器的算法.该算法通过对卫星信标信号功率谱样点域进行单元划分,在保证样点域节点处满足插值条件的前提下,实现单元域内的最佳拟合,能够有效地提升整域内的逼近精度.通过对亚洲3s卫星信标信号的静态和动态跟踪,证实该算法具有很好的动态跟踪性能,在40ms积分时间内,可使频率跟踪误差限制在±2Hz以内,有效地提升了载波频率跟踪环路的跟踪精度.一元广义延拓逼近频率跟踪算法的数学模型稳健,复杂度低,在保证动态性能和较高跟踪精度的前提下,具有很好的可实现性.

关键词：动中通系统载波频率跟踪锁频环广义延拓逼近算法

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BD2快速捕获方法的研究与FPGA实现

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数据采集与处理 2015年第3期30卷 669-676页

作者：陈宇纪元法孙希延桂林电子科技大学通信与信息学院桂林541004 广西精密导航技术与应用重点实验室桂林541004

针对北斗二代B1频点伪码相对较长,传统匹配滤波捕获占用资源过大的问题,在数字匹配滤波器的基础上,介绍一种折叠匹配滤波器结合快速傅里叶变换并行捕获的方法,将传统的多普勒频移和码相位的二维搜索减少为码相位、多普勒频移并行的一维... 详细信息

针对北斗二代B1频点伪码相对较长,传统匹配滤波捕获占用资源过大的问题,在数字匹配滤波器的基础上,介绍一种折叠匹配滤波器结合快速傅里叶变换并行捕获的方法,将传统的多普勒频移和码相位的二维搜索减少为码相位、多普勒频移并行的一维搜索,以此缩短捕获时间和减少资源的消耗。首先对算法的数学模型进行推导,然后对快速捕获的核心模块——sinc内插单元、折叠匹配滤波单元以及FFT谱分析单元的原理和FPGA电路实现进行了详细的论述。最后通过在Modelsim软件平台上的验证,证明了该实现方案具有设计合理、捕获速度快和资源消耗低的特点,在应用于北斗信号捕获的同时,还适用于其他系统的伪随机码捕获。

关键词：扩频通信快速傅里叶变换匹配滤波器可编程阵列门

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