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Mobile GPS carrier phase tracking using a novel intelligent dual‐loop receiver
Author(s) -
Mao WeiLung,
Chen AnBang
Publication year - 2008
Publication title -
international journal of satellite communications and networking
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.388
H-Index - 39
eISSN - 1542-0981
pISSN - 1542-0973
DOI - 10.1002/sat.898
Subject(s) - computer science , discriminator , global positioning system , carrier recovery , phase locked loop , control theory (sociology) , jitter , binary offset carrier modulation , dual loop , frequency offset , delay locked loop , bandwidth (computing) , narrowband , offset (computer science) , loop (graph theory) , electronic engineering , telecommunications , detector , carrier signal , frequency modulation , engineering , channel (broadcasting) , mathematics , artificial intelligence , orthogonal frequency division multiplexing , control (management) , transmission (telecommunications) , programming language , combinatorics , amplitude modulation
Carrier phase information is necessary for accurate measurements in global positioning system (GPS) applications. This paper presents a novel intelligent GPS carrier tracking loop with variable‐bandwidth characteristics for fast acquisition and better tracking capability in the presence of dynamic environments. Our dual‐loop receiver is composed of a frequency‐locked loop‐assisted phase‐locked loop structure, the fuzzy controllers (FCs), and the ATAN discriminator functions. The soft‐computing FCs provide the time‐varying loop gains to perform accurate and reliable control of the dual‐loop paradigm. Once the phase dynamic errors become large under kinematic conditions, the fuzzy loop gains increase adaptively and achieve rapid acquisition. On the other hand, when the tracking errors approach zero in the steady state, the loop gains decrease and the corresponding dual‐loop receiver returns to a narrowband system. Four types of carrier phase signals, i.e. phase offset, decaying sinusoidal phase jitter, frequency offset, and frequency ramp offset, are considered to emulate realistic mobile circumstances. Simulation results show that our proposed receiver does achieve a superior performance over conventional tracking loops in terms of faster settling time and wider acquisition range while preventing the occurrence of cycle slips. Copyright © 2008 John Wiley & Sons, Ltd.