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.
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机译：为了检测室内的微弱全球定位系统（GPS）信号，已提出了各种高灵敏度检测算法。然而，在高灵敏度和计算负担之间的常见折衷阻碍了高灵敏度GPS接收机的开发。作为另一种策略，对周期信号敏感且对噪声不敏感的混沌振荡器在微弱的信号采集中具有巨大的优势。本文将混沌振荡器应用于微弱的GPS信号采集中。利用李雅普诺夫指数（LEs）的数字指示，混沌振荡器可以在极弱的GPS信号中实现捕获。与传统算法相比，混沌振荡器耗时少，能够检测到微弱的GPS信号。在论文的最后部分，计算机仿真的结果表明，混沌振荡器算法可以获取-48 dB / 2MHz SNR的GPS信号。
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