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The Unbiased Tracking for Code Phases in vector delay lock loop

The Unbiased Tracking for Code Phases in Vector Delay Lock L...

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2nd International Conference on Computer Science and Network Technology (ICCSNT)

作者： Tong, Haibo Xiao, Zhibin Zhang, Guozhu Ou, Gang Natl Univ Def Technol Sch Elect Sci & Engn Changsha Hunan Peoples R China

ISBN: (纸本)9781467329644;9781467329637

For tracking the weak and high dynamic Global Positioning System (GPS) signals, the vector delay lock loop (VDLL) performs better than the traditional scalar based methods. The navigation states of the VDLL always converge to the biased solution when more than 4 satellites are available. In order to reduce the position bias caused by the code tracking bias, the modified VDLL with unbiased code tracking is proposed and implemented in the software defined receiver. The detector of the code phase is introduced to keep the unbiased code tracking adaptively. Simulation results show that the estimated code phase errors of the modified VDLL have zero mean when the redundant satellites are available.

关键词： vector delay lock loop unbiased code tracking GPS lock detector software defined receiver

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The unbiased tracking for code phases in vector delay lock loop

The unbiased tracking for code phases in vector delay lock l...

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International Conference on Computer Science and Network Technology (ICCSNT)

作者： Haibo Tong Zhibin Xiao Guozhu Zhang Gang Ou School of Electronic Science and Engineering National University of Defense Technology Changsha China

ISBN: (纸本)9781467329637

关键词： vector delay lock loop Unbiased code tracking GPS lock detector Software defined receiver code tracking Global Positioning Systems delay lock loops zero mean unbiasedness Codes Phase

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Low-Complexity VDLL Receiver for Multi-GNSS Constellations

Low-Complexity VDLL Receiver for Multi-GNSS Constellations

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5th ESA Workshop on Satellite Navigation Technologies / European Workshop on GNSS Signals and Signal Processing (NAVITEC)

作者： Nunes, Fernando D. Marcal, Jose M. S. Sousa, Fernando M. G. Inst Telecomunicacoes Torre Norte Piso 10Ave Rovisco Pais P-1049001 Lisbon Portugal IST P-1049001 Lisbon Portugal Inst Telecomunicacoes P-1959007 Lisbon Portugal ISEL P-1959007 Lisbon Portugal

ISBN: (纸本)9781424487417

The paper proposes a low-complexity implementation of the vector delay lock loop (VDLL) suitable for low-cost receivers operating with several GNSS constellations in indoor and urban scenarios. The tracking algorithm is based on the propagation of the estimated space/time trajectory through a grid of cells in two steps: prediction and updating. Side information about the receiver's motion and/or environment can be easily incorporated by assigning different a priori probabilities to the cells in the prediction step. The algorithm can operate reliably with a large range of satellites and has shown a remarkable robustness to the multipath effect, especially when the number of satellites in view is high.

关键词： delay lock loops low complexity VDLL receiver low complexity implementation low cost receiver multiGNSS constellations multipath effect radio receivers receiver motion satellite navigation space-time trajectory tracking algorithm vector delay lock loop

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Analysis of Deeply Integrated and Tightly Coupled Architectures

Analysis of Deeply Integrated and Tightly Coupled Architectu...

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Position Location and Navigation Symposium (PLANS)

作者： Lashley, Matthew Bevly, David M. Hung, John Y. Nav Technol Associates Huntsville AL 35802 USA Auburn Univ Dept Mech Engn Auburn AL 36849 USA Auburn Univ Dept Elect & Comp Engn Auburn AL 36849 USA

ISBN: (纸本)9781424450374

This paper analyzes the impact that architectural features have on the performance of deeply integrated and tightly coupled algorithms. The effects of two specific architectural features are investigated. The first is the design of the Kalman filter used in the algorithms. The performance degradation caused by using a federated filtering architecture instead of a single, centralized filter is analyzed. The second feature is the usage of scalar and vector tracking loops. The advantage offered by vector tracking loops over scalar tracking loops is quantified. The effects of these two architectural features are determined by analyzing the comparative performance of three different algorithms. One algorithm uses a single Kalman filter to process the GPS signals and the inertial sensor data. The other two algorithms use a federated filtering architecture. One federated algorithm uses scalar tracking loops and the other uses vector tracking loops. Comparing the performance of the three algorithms allows the effects of filter design and tracking loop operation to be isolated. Covariance analysis and Monte Carlo simulations are used to study the performance of the algorithms with different inertial sensor grades and satellite constellations. The analysis reveals that the federated algorithm with vector tracking and the centralized filtering algorithm perform virtually identically. The federated algorithm with scalar tracking loops performs poorer. However, the performance of all three algorithms converge as the carrier to noise power density ratio declines. At low signal powers, all three algorithms provide identical performance. The results quantify how the architectural features of coupled systems affect their performance.

关键词： GPS deep integration ultra-tight coupling tight coupling vector tracking vector delay lock loop vector frequency lock loop

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Spatial Temporal Adaptive Processing Based on delay vector Tracking loop

Spatial Temporal Adaptive Processing Based on Delay Vector T...

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CIE International Conference on Radar (RADAR)

作者： Li, Dengao Liu, Jinqiang Zhao, Jumin Zhao, Xiaofang Deng, Doudou Taiyuan Univ Technol Taiyuan Peoples R China

ISBN: (纸本)9781509048281

In order to overcome the high complexity, the slow convergence speed and the week robustness of the Spatial Temporal Adaptive Processing (STAP). In this letter, a novel robust scheme combining a variable forgetting factor mechanism STAP algorithm and vector delay lock loop (VDLL) is proposed to improve the anti-jamming capability of the navigation receiver. The VDLL is used to supply reference information relying on the unique structure of the coarse acquisition code for spatial temporal adaptive processing. Then an improved variable forgetting factor constant modulus recursive least squares algorithm (ITVFF-CCM-RLS) is proposed for enhancing satellite signals and suppressing interferences. Finally, the navigation signal without interference is used for VDLL tracking and calculating satellite pseudoranges. Simulation results show that the improved method can not only effectively improve the convergence speed, but also ensure the reliability of the receiver in the presence of intense interference.

关键词： vector delay lock loop Spatial temporal adaptive processing Robust beamforming Variable forgetting factor Constant modulus constraint Recursive least squares

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Position Domain Joint Tracking

Position Domain Joint Tracking

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5th ESA Workshop on Satellite Navigation Technologies / European Workshop on GNSS Signals and Signal Processing (NAVITEC)

作者： Giger, Kaspar Guenther, Christoph Tech Univ Munich Inst Commun & Nav Munich Germany German Aerosp Ctr DLR Oberpfaffenhofen Germany

ISBN: (纸本)9781424487417

It was shown that the vector delay lock loop (VDLL) enhances the robustness of a GNSS receiver by exploiting the spatial correlation of the received signals. But due to the periodicity of the carrier, the VDLL only operates on the code-phase and the carrier-frequency. In contrast to the VDLL, the Joint Tracking receiver manages to sustain the carrier-phase lock even in fast-changing, difficult environments. Other than the VDLL, the Joint Tracking algorithm doesn't estimate the receiver's location. The novel Position Domain Joint Tracking algorithm, described in this paper, combines both approaches, gaining from the advantages of both concepts. It is tested with signals generated by a constellation simulator, simulating a stationary and dynamic receiver. The test runs are discussed in terms of positioning performance. They show the big potential of such a combined receiver scheme as the signal synchronization is robust and the position estimate precise.

关键词： Kalman filters carrier-phase lock combined receiver scheme delay lock loops phase coding position domain joint tracking receivers satellite navigation signal synchronization vector delay lock loop

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A Valid Comparison of vector and Scalar Tracking loops

A Valid Comparison of Vector and Scalar Tracking Loops

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Position Location and Navigation Symposium (PLANS)

作者： Lashley, Matthew Bevly, David M. Hung, John Y. Nav Technol Associates Huntsville AL 35802 USA Auburn Univ Dept Engn Mech Auburn AL 36849 USA Auburn Univ Elect & Comp Engn Dept Auburn AL 36849 USA

ISBN: (纸本)9781424450374

This paper analyzes the benefits offered by vector tracking loops relative to scalar tracking loops. A method for designing equivalent scalar and vector tracking loops is first introduced. The benefits of vector tracking are then determined by comparing the two equivalent algorithms. The improvements in signal tracking afforded by vector tracking are quantified in different scenarios using covariance analysis and Monte Carlo simulations. The vector tracking algorithms show a maximum improvement in tracking threshold of 6.2 dB with an eleven satellite constellation and a minimum improvement of 2.4 dB with a five satellite constellation. The results presented in this paper demonstrate the amount of improvement vector tracking can provide in different situations. Furthermore, the analysis technique used to design the equivalent tracking loops provides a simple way to compare other attributes of the algorithms, such as their multipath immunity and robustness.

关键词： GPS vector tracking vector delay lock loop vector frequency lock loop deep integration ultra-tight coupling

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Research on Ultra-Tight Integration Technology for GNSS/SINS Integrated Navigation Systems

Research on Ultra-Tight Integration Technology for GNSS/SINS...

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5th China Satellite Navigation Conference (CSNC)

作者： Feng, Geng China Elect Technol Grp Corp Res Inst 20 Xian Peoples R China

ISBN: (纸本)9783642547409;9783642547393

GNSS/SINS deep integration relative to the tight integration can further improve navigation accuracy and noise immunity of high dynamic environment, and it is the future direction of development. A deep integrated navigation technology based on vector delay lock loop is researched. First, in the baseband signal preprocessing unit, Unscented Kalman Filter (UKF) is adopted to pre-filter the satellite signal, reduce the signal update rate, and the nonlinearity between I/Q signals and navigation state variables. By utilized base band signal pre-filter technology, the measurement equations of deeply integrated filter are simplified, and the calculation amount is also reduced significantly. For the heterogeneous sensor data fusion problem, in the deeply integrated filter design, an improved Unscented Particle Filter (UPF) algorithm based on the sequential importance sampling is proposed. The simulation studies show that the techniques researched here are effective. Comparing the tight integration technology, the position, velocity and attitude accuracy of navigation system are improved.

关键词： Integrated navigation Deep integration GNSS SINS vector delay lock loop UPF

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Research on Ultra-tight Integration Technology for GNSS/SINS Integrated Navigation Systems

Research on Ultra-tight Integration Technology for GNSS/SINS...

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第五届中国卫星导航学术年会

作者： Geng Feng 0th Research Institute China Electronics Technology Group Corporation Xi'an China

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Research on Ultra-tight Integration Technology for GNSS/SINS Integrated Navigation Systems

Research on Ultra-tight Integration Technology for GNSS/SINS...

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第五届中国卫星导航学术年会

作者： Geng Feng 20th Research Institute China Electronics Technology Group Corporation

GNSS/SINS deep integration relative to the tight integration can further improve navigation accuracy and noise immunity of high dynamic environment,and it is the future direction of development.A deep integrated navigation technology based on vector delay lock loop is ***,in the baseband signal preprocessing unit,Unscented Kalman Filter(UKF) is adopted to pre-filter the satellite signal,reduce the signal update rate,and the nonlinearity between I/Q signals and navigation state *** utilized base band signal pre-filter technology,the measurement equations of deeply integrated filter are simplified,and the calculation amount is also reduced *** the heterogeneous sensor data fusion problem,in the deeply integrated filter design,an improved Unscented Particle Filter(UPF) algorithm based on the sequential importance sampling is *** simulation studies show that the techniques researched here are *** the tight integration technology,the position,velocity and attitude accuracy of navigation system are improved.

关键词： Integrated navigation Deep integration GNSS SINS vector delay lock loop UPF

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