TAILIEUCHUNG - Báo cáo hóa học: "Research Article Weak GPS Signal Acquisition Algorithm Based on Chaotic Oscillator"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Research Article Weak GPS Signal Acquisition Algorithm Based on Chaotic Oscillator | Hindawi Publishing Corporation EURASIP Journal on Advances in Signal Processing Volume 2009 Article ID 862618 6 pages doi 2009 862618 Research Article Weak GPS Signal Acquisition Algorithm Based on Chaotic Oscillator Pengda Huang Yiming Pi and Zhiqin Zhao 701-4 Laboratory School of Electronic Engineering Electronic Science and Technology University of China Number 4 Section 2 Jianshe Road Chengdu 611731 China Correspondence should be addressed to Pengda Huang pdhuang@ Received 21 November 2008 Revised 21 March 2009 Accepted 16 September 2009 Recommended by Liang-Gee Chen To detect weak Global Position System GPS signal indoors various high-sensitivity detection algorithms have been proposed. However a common tradeoff between high-sensitivity and computation burden impedes development of high sensitivity GPS receiver. As another strategy chaotic oscillator sensitive to periodic signal and inert to noise possesses huge advantage in weak signal acquisition. In this paper chaotic oscillator is employed in weak GPS signal acquisition. With numerical indication of Lyapunov exponents LEs chaotic oscillator can achieve acquisition in extremely weak GPS signal. Compared with conventional algorithm chaotic oscillator consumes less acquisition time and is capable of detecting weak GPS signal. In the final section of paper results from computer simulation illustrate that chaotic oscillator algorithm can acquire GPS signal at -48 dB 2MHz SNR. Copyright 2009 Pengda Huang et al. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. 1. Introduction GPS signal indoors become extremely weak because of fading refraction reflection and multipath interference 1 . Normally line-of-sight GPS signal is at 44dBHz 2 while signal strength will degrade larger than 25 dB in bad case 3 4 . However common commercial GPS .

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