A Novel GNSS Carrier Tracking Loop Design Based on Fuzzy Logical Control

2011 ◽  
Vol 130-134 ◽  
pp. 3451-3454 ◽  
Author(s):  
Jing Bo Zhang ◽  
Shu Fang Zhang ◽  
Qin Hu ◽  
Yi Jiang ◽  
Xiao Wen Sun
Keyword(s):  
Dynamic Performance ◽  
Phase Error ◽  
Noise Interference ◽  
Fast Tracking ◽  
Phase Jitter ◽  
Loop Design ◽  
Logical Control ◽  
Error Detector ◽  
High Dynamic ◽  
Fuzzy Logical

A differential phase error detector is inserted in the carrier loop structure for improving the dynamic performance of the loop in GNSS receiver in this paper. It is used to detect the abnormal phase jitter and amplify the adjusting increment for fast tracking. In order to avoid the differential detector amplifying noise interference in locking, fuzzy logical theory is introduced into the loop to control the amplification caused by the differential detector. Finally simulations show that the proposed design achieves high dynamic performance with effectively speeding up the tracking and widening the dynamic stress range.

scholarly journals Design and Validation of a Cascading Vector Tracking Loop in High Dynamic Environments

2021 ◽  
Vol 13 (10) ◽  
pp. 2000
Author(s):  
Zhiyong Tu ◽  
Yidong Lou ◽  
Wenfei Guo ◽  
Weiwei Song ◽  
Yusheng Wang
Keyword(s):  
Unscented Kalman Filter ◽  
Negative Impact ◽  
Dynamic Performance ◽  
Phase Error ◽  
Tracking Error ◽  
Doppler Frequency ◽  
Convergence Time ◽  
Tracking Loop ◽  
Vector Tracking ◽  
High Dynamic

This paper designs a cascading vector tracking loop based on the Unscented Kalman Filter (UKF) for high dynamic environment. Constant improvement in dynamic performance is an enormous challenge to the traditional receiver. Due to the doppler effect, the satellite signals received by these vehicles contain fast changing doppler frequency shifts and the first and second derivatives of doppler frequency, which will directly cause a negative impact on the receiver’s stable tracking of the signals. In order to guarantee the dynamic performance and the tracking accuracy, this paper designs a vector carrier structure to estimate the doppler component of a signal. Firstly, after the coherence integral, the IQ values are reorganized into new observations. Secondly, the phase error and frequency of the carrier are estimated through the pre-filter. Then, the pseudorange and carrier frequency are used as the observations of the main filter to estimate the motion state of the aircraft. Finally, the current state is fed back to the carrier Numerical Controlled Oscillator (NCO) as a complete closed loop. In the whole structure, the cascading vector loop replaces the original carrier tracking loop, and the stable signal tracking of code loop is guaranteed by carrier assisted pseudo-code method. In this paper, with the high dynamic signals generated by the GNSS signal simulator, this designed algorithm is validated by a software receiver. The results show that this loop has a wider dynamic tracking range and lower tracking error than the second-order frequency locked loop assisted third-order phase locked loop in high dynamic circumstances. When the acceleration of carrier is 100 g, the convergence time of vector structure is about 100 ms, and the carrier phase error is lower than 0.6 mm.

Adaptive DLL Update Scheme for Power Fluctuation Immunity Using Phase Error Detector

2021 ◽  
Author(s):  
Siman Li ◽  
Chris Eom ◽  
Jake Jung ◽  
Brian Lee ◽  
Edwin Kim ◽  
...  
Keyword(s):  
Phase Error ◽  
Power Fluctuation ◽  
Error Detector

Multiphase dc–dc converter with high dynamic performance and high efficiency

2011 ◽  
Vol 4 (1) ◽  
pp. 101 ◽  
Author(s):  
W.Y. Wang ◽  
H.H.C. Iu ◽  
W. Du ◽  
V. Sreeram
Keyword(s):  
High Efficiency ◽  
Dynamic Performance ◽  
High Dynamic

scholarly journals Design of Closed-Loop Parameters With High Dynamic Performance for Micro-Grating Accelerometer

IEEE Access ◽  
2019 ◽  
Vol 7 ◽  
pp. 151939-151947
Author(s):  
Hui Li ◽  
Keke Deng ◽  
Shan Gao ◽  
Lishuang Feng
Keyword(s):  
Closed Loop ◽  
Dynamic Performance ◽  
High Dynamic

scholarly journals Chatter suppression in large overhang face milling using a toolholder with high dynamic performance

2020 ◽  
Vol 108 (5-6) ◽  
pp. 1713-1724 ◽  
Author(s):  
Yan Xia ◽  
Yi Wan ◽  
Xichun Luo ◽  
Hongwei Wang ◽  
Ning Gong ◽  
...  
Keyword(s):  
Dynamic Performance ◽  
Face Milling ◽  
Chatter Suppression ◽  
High Dynamic

Realization of Programmable BPSK Demodulator-Bit Synchronizer using Multirate Processing

2014 ◽  
Vol 3 (1) ◽  
pp. 18
Author(s):  
Anshuman Sharma ◽  
Abdul Hafeez Syed ◽  
Midhun M ◽  
M R Raghavendra
Keyword(s):  
Data Rate ◽  
Timing Error ◽  
Specific Data ◽  
Matlab Simulink ◽  
Design And Implementation ◽  
Loop Design ◽  
Error Detector ◽  
Costas Loop ◽  
Multirate Processing

This paper presents the design and implementation of programmable BPSK demodulator and bit synchronizer. The demodulator is based on the Costas loop design whereas the bit synchronizer is based on Gardner timing error detector. The advantage of this design is that it offers programmability using multi-rate processing and does not rely on computation of filter coefficients, NCO angle input for each specific data rate and thus avoids computational complexities. The algorithm and its application were verified on Matlab-Simulink and were implemented on ALTERA platform. A 32 kHz BPSK demodulator–bit synchronizer pair catering for a data rate from 1kbps to 8kbps was implemented.

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