Using Fuzzy Logic Controller with Adaptive Detection Scheme for Fast Acquisition of Satellite Navigation Signals

in Sciences Citation Index(SCI), 科學引文索引資料庫(SCI)
標題Using Fuzzy Logic Controller with Adaptive Detection Scheme for Fast Acquisition of Satellite Navigation Signals
出版類型SCI(Sciences Citation Index)
出版年度2010
AuthorsChung-Liang Chang, 張仲良
開始頁367
頁數11
出版日期2011 / 4
其他編號NSC 98-2218-E-020 -003
中文摘要

The paper presents a fuzzy logic controller (FLC) with adaptive threshold control
scheme to regulate frequency search step size so as to enhance performance in
global navigation satellite system (GNSS) signal acquisition. Conventional frequency
search can be achieved utilizing step-by-step frequency bin search or through fast
Fourier transform (FFT). Nevertheless, too large a frequency search step size and
short length of FFT result in large loss of correlation, whereas too small frequency
search step size and long length of FFT increase signal acquisition time. To shorten
signal acquisition time without influencing the accuracy of signal parameters, the FLC
is employed to regulate the frequency search step size in the frequency domain on the
basis of an input variable: code correlation value and its rate of change. To enhance
the robustness of signal acquisition performance, the signal detection threshold is
adaptively adjusted and combined with FLC. Besides, the basis value of membership
function in FLC is adjustable. Hence, the input and output parameters of membership
functions (MFs) vary with the adjustment of the detection threshold. Simulations and
experimental results demonstrate that the proposed method enhances acquisition performance with regards to execution time and precision of parameters in GNSS signals.

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期刊名稱Journal of the Chinese Institute of Engineers, Special Issue on Intelligent Sensing, Actuation, and Control
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