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Initial alignment of compass based on genetic algorithm-particle swarm optimization

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Defence Technology（防务技术） 2020年第1期16卷 257-262页

作者： Yi-feng Liang Peng-fei Jiang Jiang-ning Xu Wen An Miao Wu College of Electrical Engineering Naval Univ.of EngineeringWuhan 430033China

The rapidity and accuracy of the initial alignment influence the performance of the strapdown inertial navigation system(SINS),compass alignment is one of the most important methods for initial *** selection of the parameters of the compass alignment loop directly affects the result of ***,the optimal parameters of the compass loop of different SINS are also different Traditionally,the alignment parameters are determined by experience and trial-and-error,thus it cannot ensure that the parameters are *** this paper,the Genetic Algorithm-Particle Swarm Optimization(GA-PSO) algorithm is proposed to optimize the compass alignment parameters so as to improve the performance of the initial alignment of strapdown *** experiment results showed that the GA-PSO algorithm can find out the optimal parameters of the compass alignment circuit quickly and accurately and proved the effectiveness of the proposed method.

关键词： Inertial alignment Genetic algorithm SINS compass alignment

A double-filter-structure based compass/INS deep integrated navigation system implementation and tracking performance evaluation

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Science China(Information Sciences) 2014年第1期57卷 232-245页

作者： LUO Yong WU WenQi BABU Ravindra TANG KangHua HE XiaoFeng College of Mechatronics and Automation National University of Defense Technology

Beidou or compass is a Chinese GNSS(global navigation satellite system).Like the GPS receiver,the compass receiver also faces the challenge of choosing an optimal bandwidth to satisfy both anti-jamming capability and dynamics adaptation ***/INS(inertial navigation system)deep integrated navigation system has solved this problem by fusing GPS baseband signal and INS information in a deeply coupled *** this study,a compass B3 frequency is considered and a traditional federated GPS/INS deep integration model is used to derive a single-filter-structure based compass/INS deep integration ***,a double-filter-structure based compass/INS deep integration model is *** simulation results show a better carrier tracking performance,especially a better dynamics *** impact of IMU errors and vehicle’s dynamics on carrier tracking performance of the double-filter-structure based compass/INS deep integrated navigation system are evaluated in simulated and field *** and field test results are in accordance with the theory analysis.

关键词： B3 frequency compass compass/INS deep integrated navigation system double-filter-structure

A fully integrated frequency synthesizer for a dual-mode GPS and compass receiver

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Journal of Semiconductors 2012年第3期33卷 69-75页

作者：楚晓杰林敏石寅代伐 Institute of Semiconductors Chinese Academy of Sciences Department of Electrical&Computer Engineering Auburn University

This paper presents a fully integrated frequency synthesizer for a dual-mode GPS and compass receiver fabricated in a 0.13μm CMOS *** frequency synthesizer is implemented with an on-chip symmetric inductor and an on-chip loop filter.A capacitance multiplying approach is proposed in the on-chip loop filter design for area-saving ***-swallow topology with a multistage noise shaping△Σmodulator is adopted in the frequency divider *** synthesizer generates local oscillating signals at 1571.328 MHz and 1568.259 MHz with a 16.368 MHz reference clock by working in integer and fractional *** results show that the phase noise of the synthesizer achieves -91.3 dBc/Hz and -117 dBc/Hz out of band at 100 kHz and 1 MHz frequency offset,*** proposed frequency synthesizer consumes 8.6 mA from a 1.2 V power supply and occupies an area of 0.92 mm;.

关键词： fully integrated frequency synthesizer GPS compass

TD-AltBOC:A new compass B2 modulation

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Science China(Physics,Mechanics & Astronomy) 2011年第6期54卷 1014-1021页

作者： TANG ZuPing ZHOU HongWei WEI JiaoLong YAN Tao LIU YuQi RAN YiHang ZHOU YanLing Department of Electronics and Information Engineering Huazhong University of Science and TechnologyWuhan 430074China Beijing Institute of Tracking and Telecommunication Technology Beijing 100094China

AltBOC(15,10) is the baseline of compass B2 signal *** is a BOC-like signal having different PN codes in the lower and the upper main split lobes,which allow one signal service per *** two lobes can be received and processed separately like two BPSK(10) signals,or coherently processed to achieve better *** among compass B2,Galileo E5 and GPS L5 is also achievable using AltBOC ***,Galileo's 4-code AltBOC has drawbacks such as low efficiency and great receiver *** paper presents a new modulation type named TD-AltBOC (Time Division AltBOC).The signal generation scheme and receiving method are presented,and are compared with AltBOC in the areas of power spectrum,ranging accuracy,anti-multipath performance,anti-interference performance,processing flexibility and *** results show TD-AltBOC has similar spectrum characteristics,interoperability,flexibility and anti-interference performance with *** the frontend bandwidth is more than 50 MHz,TD-AltBOC can achieve better ranging accuracy and anti-multipath *** also has such advantages as high efficiency and low receiver ***-AltBOC could be a good solution to compass B2 navigation signal.

关键词： GNSS compass signal structure TD-AltBOC signal modulation

Dual-band RF receiver for GPS-L1 and compass-B1 in a 55-nm CMOS

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Journal of Semiconductors 2014年第2期35卷 92-101页

作者：李松亭李建成谷晓忱庄钊文 School of Electronic Science and Engineering National University of Defense Technology

A fully integrated dual-band RF receiver with a low-IF architecture is designed and implemented for GPS-L 1 and compass-Bl in a 55-nm CMOS process. The receiver incorporates two independent IF channels with 2 or 4 MHz bandwidth to receive dual-band signals around 1.57 GHz respectively. By implementing a flexible frequency plan, the RF front-end and frequency synthesizer are shared for the dual-band operation to save power consumption and chip area, as well as avoiding LO crosstalk. A digital automatic gain control （AGC） loop is utilized to improve the receiver＇s robustness by optimizing the conversion gain of the analog-to-digital converter （ADC）. While drawing about 20 mA per channel from a 1.2 V supply, this RF receiver achieves a minimum noise figure （NF） of about 1.8 dB, an image rejection （IMR） of more than 35 dB, a maximum voltage gain of about 122 dB, a gain dynamic range of 82 dB, and an maximum input-referred 1 dB compression point of about -36.5 dBm with an active die area of 1.5 × 1.4 mm2 for the whole chip.

关键词： automatic gain control CMOS compass dual-band GPS RF receiver

A new unequal-weighted triple-frequency first order ionosphere correction algorithm and its application in compass

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Science China(Physics,Mechanics & Astronomy) 2012年第3期55卷 546-552页

作者： WenXiang Liu WeiHua Mou FeiXue Wang Natl Univ Def Technol Satellite Nav Res & Dev Ctr Sch Elect Sci & Engn Changsha 410073 Hunan Peoples R China

As the introduction of triple-frequency signals in GNSS,the multi-frequency ionosphere correction technology has been fast *** indicate that the triple-frequency second order ionosphere correction is worse than the dual-frequency first order ionosphere correction because of the larger noise amplification *** the assumption that the variances of three frequency pseudoranges were equal,other references presented the triple-frequency first order ionosphere correction,which proved worse or better than the dual-frequency first order correction in different *** practice,the PN code rate,carrier-to-noise ratio,parameters of DLL and multipath effect of each frequency are not the same,so three frequency pseudorange variances are *** this consideration,a new unequal-weighted triple-frequency first order ionosphere correction algorithm,which minimizes the variance of the pseudorange ionosphere-free combination,is proposed in this *** is found that conventional dual-frequency first-order correction algorithms and the equal-weighted triple-frequency first order correction algorithm are special cases of the new algorithm.A new pseudorange variance estimation method based on the three carrier combination is also *** analysis shows that the new algorithm is *** experiment with compass G3 satellite observations demonstrates that the ionosphere-free pseudorange combination variance of the new algorithm is smaller than traditional multi-frequency correction algorithms.

关键词： GNSS ionospheric delay ionosphere-free combination compass

The wide-area difference system for the regional satellite navigation system of compass

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Science China(Physics,Mechanics & Astronomy) 2012年第7期55卷 1307-1315页

作者： CAO YueLing HU XiaoGong WU Bin ZHOU ShanShi LIU Li SU RanRan CHANG ZhiQiao HE Feng ZHOU JianHua Shanghai Astronomical Observatory Chinese Academy of Sciences Shanghai 200030 China Graduate University of Chinese Academy of Seiences Beijing 100049 China Beijing Global Information Application and Development Center Beijing 100094 China

The regional satellite navigation system of compass (Phase I) provides both open services and authorized services. Authorized services offer differential corrections and integrity information to users to support higher positioning, navigation and timing precision. Experimenting with real data, positioning accuracy is estimated with a 3GEO/4IGSO compass constellation. The results show that with dual-frequency and single-frequency pseudo-range measurements, the positioning errors are respectively 8 and 10 m (RMS) for open service users, while for authorized users, the errors are 4 and 5 m (RMS), respectively. The compass constellation geometry may cause large error to occur in the height component by 7-9 m for dualor single-frequency users, which can be effectively reduced with the differential corrections supplied by the authorized services. Multipath errors are identified and corrected for compass, resulting in 25% positioning accuracy improvement for dual-frequency users and 10% improvement for single-frequency users.

关键词： compass equivalent satellite clock error ionospheric grid multipath error positioning error

compass B1信号设计中的非对称ALTBOC复用技术

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清华大学学报（自然科学版） 2012年第6期52卷 869-873页

作者：朱亮姚铮陆明泉冯振明清华大学电子工程系北京100084

中国第二代卫星导航系统(compass)将分为区域和全球系统2个阶段完成,使得研发多路导航信号复用技术实现compass的平稳过渡问题成为一项紧迫任务。该文提出了一种非对称ALTBOC复用技术,通过复子载波将调制在2个不同中心频点,具有不同调... 详细信息

中国第二代卫星导航系统(compass)将分为区域和全球系统2个阶段完成,使得研发多路导航信号复用技术实现compass的平稳过渡问题成为一项紧迫任务。该文提出了一种非对称ALTBOC复用技术,通过复子载波将调制在2个不同中心频点,具有不同调制方式和码速率的4路二进制信号分量恒包络复用在同一载波上。仿真结果表明:该方法复用损耗小于1dB,在非匹配接收模式下,采用4MHz带宽和10MHz带宽接收的相关信噪比损耗分别约为1.5dB和1.1dB,具有较高的复用效率和较好的信号接收性能,是实现compass B1区域信号和全球信号平稳过渡的有效解决方案。

关键词：卫星导航 compass 多路复用技术平稳过渡非对称ALTBOC 复用效率接收性能

一种适于compass周跳探测的三频数据优化组合

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武汉大学学报（信息科学版） 2010年第10期35卷 1157-1160页

作者：孙保琪欧吉坤盛传贞刘吉华中国科学院测量与地球物理研究所动力大地测量重点实验室武汉市徐东大街340号430077 中国科学院研究生院北京市玉泉路19号100049

根据多频数据组合原理,推导了组合观测值电离层比例因子与噪声比例因子的关系,分析了compass码和相位的多种可能组合,从中选取3种线性无关的优化组合作为周跳检验量。所选检验量保持了周跳的整数特性,便于准确估计与修复周跳。利用Compa... 详细信息

根据多频数据组合原理,推导了组合观测值电离层比例因子与噪声比例因子的关系,分析了compass码和相位的多种可能组合,从中选取3种线性无关的优化组合作为周跳检验量。所选检验量保持了周跳的整数特性,便于准确估计与修复周跳。利用compass-M1实测数据进行的实验表明,基于优化组合可以探测出1周以上的所有周跳,在缺失历元较少和无电离层异常时可以准确估计与修复基本频率的周跳。

关键词： compass GNSS 卫星导航多频组合周跳探测与修复