Tracking Loop

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Ren Xiao-yu - One of the best experts on this subject based on the ideXlab platform.

  • GNSS Adaptive Vector Tracking Loop on High Dynamic
    Computer Simulation, 2014
    Co-Authors: Ren Xiao-yu
    Abstract:

    This paper is based on the background which is the study of optimization design in satellite navigation. When the carrier receiver is in high dynamic motion state,the traditional Tracking Loop lock is easy to lose. If it uses the vector Tracking Loop,although it has good Tracking performance,but in the case of extreme deterioration environmental of signal,state estimation can become worse and then seriously affect the navigation and positioning accuracy and stability. According to the above problem,this paper adopted the adaptive vector Tracking Loop( A-VLL). The A-VLL can adaptively adjust the measurement noise covariance matrix Rkand feedback estimation,and reduc the purpose of the estimation error. MATLAB simulation results show that the adaptive vector Tracking Loop has good accuracy and stability when the receiver is in high dynamic and weak signal motion state.

  • Vector Tracking Loop of GNSS Based on Adaptive Second Kalman Filterin High Dynamic
    Computer Simulation, 2014
    Co-Authors: Ren Xiao-yu
    Abstract:

    Vector Tracking Loop well solved the problem that it is hard to track traditional scalar Loop in high dynamic. But under the condition that a priori information is not accurate,vector Tracking Loop also has Tracking unstable defect. to overcome this defect,a vector Tracking Loop based on adaptive second Kalman filter was proposed. This Loop can not only maintain a stable Tracking,but also improve the Tracking accuracy through fading factor adaptively and adjusting the Kalman gain matrix. Finally,a software simulation of high dynamic defined by the jet propulsion laboratory in the United States was made. The simulation results show that this Loop has the advantages of higher accuracy and higher stability than the traditional scalar Loop and vector Tracking Loop.

Weixing Sheng - One of the best experts on this subject based on the ideXlab platform.

  • Adaptive angle Tracking Loop design based on digital phase-locked Loop
    Signal Processing, 2016
    Co-Authors: Jiang Bingbing, Renli Zhang, Weixing Sheng, Yubing Han
    Abstract:

    Angle Tracking Loop in airborne radar systems is vital in 3D joint Tracking Loops of range, velocity, and angle. This study concerns two angle Tracking issues when an airborne digital array radar system tracks a maneuvering target: slow convergence, and a divergent issue of Tracking errors at the final Tracking phase. A new angle Tracking Loop called "constant coefficient angle Tracking Loop filter" (CCATLF) based on digital phase-locked Loop (DPLL) is proposed. To improve Tracking performance, a novel algorithm called "adaptive angle Tracking Loop filter" (AATLF) is also proposed based on CCATLF. In this algorithm, an adaptive equivalent Loop noise bandwidth is derived to adjust with the angle by solving an optimization problem that involves angle measuring value and beam pointing. A theoretical error variance formula and stability analysis of the Loop are also presented. Experiment results demonstrate that the proposed AATLF algorithm performs better, and is more effective and robust compared with other angle Tracking algorithms. We design a new angle Tracking Loop based on digital phase-locked Loop.A novel adaptive angle Tracking Loop algorithm is proposed.A theoretical formula of angle Tracking error variance is derived.Stability analysis and remarks on practical applications are provided.

  • ICCAIS - CPAFC-based radar seeker velocity Tracking Loop design
    2015 International Conference on Control Automation and Information Sciences (ICCAIS), 2015
    Co-Authors: Bingbing Jiang, Renli Zhang, Weixing Sheng, Xiaofeng Ma
    Abstract:

    The velocity Tracking Loop in a radar seeker plays a vital role in the 3D joint Tracking of range, velocity and angle. In order to obtain a satisfying velocity Tracking performance, this paper designs a velocity Tracking Loop which utilizes the cross product automatic frequency control (CPAFC) algorithm to measure the frequency difference in target's Doppler domain, and passes the measured value into the Loop filter (LF) to predict target's velocity of the next coherent processing interval (CPI). Experiment results demonstrate that compared with the velocity Tracking Loop using the high-low Doppler Tracking filter, the proposed method has a smaller root-mean-square error and a better Tracking performance.

  • ICCAIS - CPAFC-based radar seeker velocity Tracking Loop design
    2015 International Conference on Control Automation and Information Sciences (ICCAIS), 2015
    Co-Authors: Bingbing Jiang, Renli Zhang, Weixing Sheng, Xiaofeng Ma
    Abstract:

    The velocity Tracking Loop in a radar seeker plays a vital role in the 3D joint Tracking of range, velocity and angle. In order to obtain a satisfying velocity Tracking performance, this paper designs a velocity Tracking Loop which utilizes the cross product automatic frequency control (CPAFC) algorithm to measure the frequency difference in target's Doppler domain, and passes the measured value into the Loop filter (LF) to predict target's velocity of the next coherent processing interval (CPI). Experiment results demonstrate that compared with the velocity Tracking Loop using the high-low Doppler Tracking filter, the proposed method has a smaller root-mean-square error and a better Tracking performance.

Renli Zhang - One of the best experts on this subject based on the ideXlab platform.

  • Adaptive angle Tracking Loop design based on digital phase-locked Loop
    Signal Processing, 2016
    Co-Authors: Jiang Bingbing, Renli Zhang, Weixing Sheng, Yubing Han
    Abstract:

    Angle Tracking Loop in airborne radar systems is vital in 3D joint Tracking Loops of range, velocity, and angle. This study concerns two angle Tracking issues when an airborne digital array radar system tracks a maneuvering target: slow convergence, and a divergent issue of Tracking errors at the final Tracking phase. A new angle Tracking Loop called "constant coefficient angle Tracking Loop filter" (CCATLF) based on digital phase-locked Loop (DPLL) is proposed. To improve Tracking performance, a novel algorithm called "adaptive angle Tracking Loop filter" (AATLF) is also proposed based on CCATLF. In this algorithm, an adaptive equivalent Loop noise bandwidth is derived to adjust with the angle by solving an optimization problem that involves angle measuring value and beam pointing. A theoretical error variance formula and stability analysis of the Loop are also presented. Experiment results demonstrate that the proposed AATLF algorithm performs better, and is more effective and robust compared with other angle Tracking algorithms. We design a new angle Tracking Loop based on digital phase-locked Loop.A novel adaptive angle Tracking Loop algorithm is proposed.A theoretical formula of angle Tracking error variance is derived.Stability analysis and remarks on practical applications are provided.

  • ICCAIS - CPAFC-based radar seeker velocity Tracking Loop design
    2015 International Conference on Control Automation and Information Sciences (ICCAIS), 2015
    Co-Authors: Bingbing Jiang, Renli Zhang, Weixing Sheng, Xiaofeng Ma
    Abstract:

    The velocity Tracking Loop in a radar seeker plays a vital role in the 3D joint Tracking of range, velocity and angle. In order to obtain a satisfying velocity Tracking performance, this paper designs a velocity Tracking Loop which utilizes the cross product automatic frequency control (CPAFC) algorithm to measure the frequency difference in target's Doppler domain, and passes the measured value into the Loop filter (LF) to predict target's velocity of the next coherent processing interval (CPI). Experiment results demonstrate that compared with the velocity Tracking Loop using the high-low Doppler Tracking filter, the proposed method has a smaller root-mean-square error and a better Tracking performance.

  • ICCAIS - CPAFC-based radar seeker velocity Tracking Loop design
    2015 International Conference on Control Automation and Information Sciences (ICCAIS), 2015
    Co-Authors: Bingbing Jiang, Renli Zhang, Weixing Sheng, Xiaofeng Ma
    Abstract:

    The velocity Tracking Loop in a radar seeker plays a vital role in the 3D joint Tracking of range, velocity and angle. In order to obtain a satisfying velocity Tracking performance, this paper designs a velocity Tracking Loop which utilizes the cross product automatic frequency control (CPAFC) algorithm to measure the frequency difference in target's Doppler domain, and passes the measured value into the Loop filter (LF) to predict target's velocity of the next coherent processing interval (CPI). Experiment results demonstrate that compared with the velocity Tracking Loop using the high-low Doppler Tracking filter, the proposed method has a smaller root-mean-square error and a better Tracking performance.

Xin Long Wang - One of the best experts on this subject based on the ideXlab platform.

  • design of an adaptive gps vector Tracking Loop with the detection and isolation of contaminated channels
    Gps Solutions, 2017
    Co-Authors: Zhaoyan Sun, Xin Long Wang, Shaojun Feng, Huan Che, Jinpeng Zhang
    Abstract:

    In vector Tracking Loop (VTL), the relativity among received signals is exploited to deeply integrate the entire information within signal processing channels. However, the Tracking error in one channel may corrupt other channels and lead to an increasing degradation in the Tracking performance. An adaptive GPS vector Tracking Loop with the detection and isolation of contaminated channels is proposed to suppress the propagation of Tracking error and to make the vector-based receiver less vulnerable in poor signal quality environments resulting from signal attenuation, interference and jamming. The vectorial transfer function models and the noise bandwidths of both the vector frequency lock Loop and the vector delay lock Loop are established to accurately calculate bandwidths and optimally design parameters for VTL. The autonomous fault detection algorithm based on uniformly most powerful test for VTL is designed to detect and isolate contaminated channels (with large Tracking error due to the poor signal quality) by monitoring the bandwidth statistics of all Tracking Loops. The results of trials in harsh situations show that the proposed adaptive VTL is superior to baseline VTL, allowing the accuracy, the availability and the reliability of the vector-based receiver to be improved. In conclusion, the proposed adaptive VTL with the detection and isolation of contaminated channels is a powerful method for applications in GPS-challenged environments.

  • a high sensitivity gps receiver carrier Tracking Loop design for high dynamic applications
    Gps Solutions, 2015
    Co-Authors: Xin Long Wang, Xinchun Ji, Shaojun Feng, Vincent Calmettes
    Abstract:

    In order to enhance the Tracking performance of global positioning system (GPS) receivers for weak signal applications under high-dynamic conditions, a high-sensitivity and high-dynamic carrier-Tracking Loop is designed. The high-dynamic performance is achieved by aiding from a strapdown inertial navigation system (SINS). In weak signal conditions, a dynamic-division fast Fourier transform (FFT)-based Tracking algorithm is proposed to improve the sensitivity of GPS receivers. To achieve the best performance, the Tracking Loop is designed to run either in the conventional SINS-aided phase lock Loop mode (time domain) or in the frequency-domain-Tracking mode according to the carrier-to-noise spectral density ratio detected in real time. In the frequency-domain-Tracking mode, the proposed dynamic-division FFT algorithm is utilized to estimate and correct the error of the SINS aiding. Furthermore, the optimal values of the dynamic-division step and the FFT size are selected to maximize the signal-to-noise ratio gain. Simulation results demonstrate that the designed Loop can significantly improve the Tracking sensitivity and robustness for weak GPS signals without compromising the dynamic performance.

  • Research on INS-Aided GNSS Carrier Tracking Loop in High Dynamic Circumstance
    Applied Mechanics and Materials, 2013
    Co-Authors: Xin Long Wang
    Abstract:

    GNSS receiver will produce a large Doppler shift in high dynamic environment, thus causing lock-lose of the Tracking Loop. INS-aided GNSS tightly coupled system can improve Tracking performance in high dynamic environment by introducing the Doppler information estimated by INS. Through analyzing by the theory of closed Loop control system theory and numerical simulation of the INS-aided carrier Tracking Loop, the results show that INS-aided carrier Tracking Loop can obviously improve the stability of carrier Tracking performance and anti-jamming ability of the satellite navigation receiver in high dynamic circumstance.

Vincent Calmettes - One of the best experts on this subject based on the ideXlab platform.

  • a high sensitivity gps receiver carrier Tracking Loop design for high dynamic applications
    Gps Solutions, 2015
    Co-Authors: Xin Long Wang, Xinchun Ji, Shaojun Feng, Vincent Calmettes
    Abstract:

    In order to enhance the Tracking performance of global positioning system (GPS) receivers for weak signal applications under high-dynamic conditions, a high-sensitivity and high-dynamic carrier-Tracking Loop is designed. The high-dynamic performance is achieved by aiding from a strapdown inertial navigation system (SINS). In weak signal conditions, a dynamic-division fast Fourier transform (FFT)-based Tracking algorithm is proposed to improve the sensitivity of GPS receivers. To achieve the best performance, the Tracking Loop is designed to run either in the conventional SINS-aided phase lock Loop mode (time domain) or in the frequency-domain-Tracking mode according to the carrier-to-noise spectral density ratio detected in real time. In the frequency-domain-Tracking mode, the proposed dynamic-division FFT algorithm is utilized to estimate and correct the error of the SINS aiding. Furthermore, the optimal values of the dynamic-division step and the FFT size are selected to maximize the signal-to-noise ratio gain. Simulation results demonstrate that the designed Loop can significantly improve the Tracking sensitivity and robustness for weak GPS signals without compromising the dynamic performance.