Weak Satellite Signal Tracking Loop Based on Traditional Tracking Framework

Although the vector tracking loop architectures provide several important advantages, they suffer some fundamental drawbacks. The most significant drawback is that failure of tracking in one channel may affect the entire system and lead to loss of lock on all satellites. The other drawback is that errors in the navigation solutions may degrade the accuracy of the tracking results. For robustness improvement of the vector tracking loop, the EKF based receiver autonomous integrity monitoring (RAIM) and fault detection and exclusion (FDE) algorithms are developed to prevent the error of one channel from spreading into the vector tracking loop. The RAIM is used to check the possible fault in the pseudorange and the pseudorange rate; the fault detection and exclusion mechanism is employed for excluding the abnormal satellite signal to prevent the failure of one channel from spreading into the entire tracking loop. The feasibility of the proposed method will be demonstrated. Performance assessment and evaluation for the proposed approach will be carried out.

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An Array Nonlinear Kalman Tracker for Indoor GPS Signal

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.44-47.3864 ◽

2010 ◽

Vol 44-47 ◽

pp. 3864-3868

Author(s):

Ji Cheng Ding ◽

Lin Zhao ◽

Jia Liu ◽

Shuai He Gao

Keyword(s):

Dynamic Programming ◽

Kalman Filter ◽

Detection Probability ◽

Viterbi Algorithm ◽

Signal Quality ◽

Tracking Loop ◽

Central Difference ◽

Signal Tracking ◽

High Detection ◽

Central Difference Kalman Filter

To implement indoor GPS signal tracking in standalone mode when the tracking loop is unlocked and data bit edge is unknown, the paper develops a modified Viterbi Algorithm (MVA) based on dynamic programming, and it was applied for GPS bit synchronization. Besides, two combination carrier tracking schemes based on Central Difference Kalman Filter (CDKF) and MVA module were designed for indoor GPS signal. The testing results indicate that the methods can successful detect bit edge position with high detection probability whether or not the tracking loop is locked. The co-operational tracking scheme is still able to perform when the signal quality deteriorate.

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A Novel Global Position System Signal Tracking Loop Under Dynamic Environments

Journal of Computational and Theoretical Nanoscience ◽

10.1166/jctn.2016.4786 ◽

2016 ◽

Vol 13 (1) ◽

pp. 169-178

Author(s):

Zhi-Yong Miao ◽

Yun-Long Lv ◽

Ding-Jie Xu ◽

Feng Shen ◽

Shun-Wan Pang

Keyword(s):

Global Position System ◽

Dynamic Environments ◽

Position System ◽

Tracking Loop ◽

Global Position System Signal ◽

Signal Tracking

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Performance analysis of a novel kalman filter-based signal tracking loop

Proceedings of the 2nd International Conference on Robotics, Control and Automation - ICRCA '17 ◽

10.1145/3141166.3141171 ◽

2017 ◽

Author(s):

Wang Wentong ◽

Li Chuanjun ◽

Wu jiangxiong

Keyword(s):

Kalman Filter ◽

Performance Analysis ◽

Tracking Loop ◽

Signal Tracking

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Urban and Indoor Weak Signal Tracking Using an Array Tracker with MVA and Nonlinear Filtering

Journal of Applied Mathematics ◽

10.1155/2014/107156 ◽

2014 ◽

Vol 2014 ◽

pp. 1-10 ◽

Cited By ~ 2

Author(s):

Jicheng Ding ◽

Guoli Zhang ◽

Lin Zhao

Keyword(s):

Detection Probability ◽

Nonlinear Filtering ◽

Indoor Environment ◽

Viterbi Algorithm ◽

Signal Quality ◽

Tracking Loop ◽

Central Difference ◽

Signal Tracking ◽

Position Detection ◽

Central Difference Kalman Filter

We focus on the need for weak GPS signal tracking technique at a receiver powered on in urban or indoor environment; the tracking loop is unlocked and data bit edge position is unknown. A modified Viterbi algorithm (MVA) based on dynamic programming is developed and it is applied to GPS bit synchronization to improve bit edge position detection probability. Meanwhile, two combination carrier tracking schemes based on central difference Kalman filter (CDKF) and MVA module are designed for tracking very weak GPS signal. The testing results indicate that the methods can successfully detect bit edge position with high detection probability whether or not the tracking loop is locked. The tested combination tracking scheme is still able to work well when the signal quality deteriorates to 20 dB-Hz without additional large store space.

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A Cascade Tracking Loop for Weak GPS Signals

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.719-720.1116 ◽

2015 ◽

Vol 719-720 ◽

pp. 1116-1123 ◽

Cited By ~ 1

Author(s):

Ming Xing Shi ◽

Bi Yu Tang ◽

Ao Peng

Keyword(s):

Carrier Phase ◽

Frequency Estimation ◽

Measuring Error ◽

Phase Estimation ◽

Weak Signal ◽

Gps Receiver ◽

Tracking Loop ◽

Signal Tracking ◽

Tracking Process ◽

Cascade Structure

It’s important to get accurate carrier phase and frequency information when using a standalone GPS receiver. In weak signal applications, to keep a stable tracking is hard to achieve because measuring error will be huge when the SNR is low. Different methods are used to improve the SNR before the detector in a tracking process, such as coherence integration. And this paper keeps eyes on a different viewpoint, on how to refine estimation results. A cascade structure is introduced for weak signal tracking. This structure is divided into two levels. In the first level, raw phase estimation and accurate frequency estimation is provided to achieve stable work in low CNR environment. In the second level, the raw phase estimation is refined to achieve accurate tracking requirement. This cascade structure can also work jointly with any other SNR-improving technology to get a better performance.

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Research on Acquisition and Tracking Algorithm of Global Satellite Positioning Receiver Based on UWB

Wireless Communications and Mobile Computing ◽

10.1155/2021/9025086 ◽

2021 ◽

Vol 2021 ◽

pp. 1-9

Author(s):

Li Yang ◽

Danshi Sun ◽

Haote Ruan

Keyword(s):

Influence Factor ◽

Three Dimensional ◽

Doppler Frequency ◽

Pulse Generation ◽

Tracking Algorithm ◽

Tracking Accuracy ◽

Signal Tracking ◽

Satellite Positioning ◽

Working Principle ◽

Satellite Signal

In order to overcome the problems of the traditional algorithm, such as the time-consuming execution of acquisition instructions, low signal tracking accuracy, and low signal capture accuracy, a global satellite positioning receiver acquisition and tracking algorithm based on UWB technology is designed in this study. On the basis of expounding the pulse generation method and working principle in UWB technology, this paper analyzes in detail the characteristics of UWB technology, such as antimultipath, low power consumption, and strong penetration. Then, on the basis of window function filtering, in the process of three-dimensional search of global satellite positioning signal, firstly, the satellite signal entering the GPS software receiver is processed by RF front-end mixing and AD sampling, and then, the signal tracking and navigation message solving are completed according to the relationship between the influence factor and Doppler frequency offset. The experimental results show that the execution time of the acquisition instruction of the proposed algorithm varies between 1129 ms and 1617 ms; the signal tracking accuracy ranges between 0.931 and 0.951, and the signal capture accuracy ranges between 93.3% and 95.6%, which proves that the proposed algorithm has achieved the design expectation.

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