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首页> 美国卫生研究院文献>Sensors (Basel Switzerland) >A Low-Ambiguity Signal Waveform for Pseudolite Positioning Systems Based on Chirp
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A Low-Ambiguity Signal Waveform for Pseudolite Positioning Systems Based on Chirp

机译：基于线性调频的伪卫星定位系统的低模糊信号波形

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摘要

Signal modulation is an essential design factor of a positioning system, which directly impacts the system’s potential performance. Chirp compressions have been widely applied in the fields of communication, radar, and indoor positioning owing to their high compression gain and good resistance to narrowband interferences and multipath fading. Based on linear chirp, we present a modulation method named chirped pseudo-noise (ChPN). The mathematical model of the ChPN signal is provided with its auto-correlation function (ACF) and the power spectrum density (PSD) derived. The ChPN with orthogonal chirps is also discussed, which has better resistance to near-far effect. Then the generation and detection methods as well as the performances of ChPN are discussed by theoretical analysis and simulation. The results show that, for ChPN signals with the same main-lobe bandwidth (MLB), generally, the signal with a larger sweep bandwidth has better tracking precision and multipath resistance. ChPN yields slighter ACF peaks ambiguity due to its lower ACF side-peaks, although its tracking precision is a little worse than that of a binary offset carrier (BOC) with the same MLB. Moreover, ChPN provides better overall anti-multipath performance than BOC. For the ChPN signals with the same code rate, a signal with a larger sweep bandwidth has better performance in most aspects. In engineering practice, a ChPN receiver can be implemented by minor modifications of a BOC receiver. Thus, ChPN modulation shows promise for future positioning applications.
机译：信号调制是定位系统的重要设计因素，它直接影响系统的潜在性能。线性调频压缩由于其高压缩增益以及对窄带干扰和多径衰落的良好抵抗力，已被广泛应用于通信，雷达和室内定位领域。基于线性chi，我们提出了一种称为chi伪噪声（ChPN）的调制方法。 ChPN信号的数学模型具有其自相关函数（ACF）和导出的功率谱密度（PSD）。还讨论了具有正交chi的ChPN，它具有更好的抗远近效应。然后通过理论分析和仿真讨论了ChPN的产生和检测方法以及性能。结果表明，对于具有相同主瓣带宽（MLB）的ChPN信号，通常，具有较大扫描带宽的信号具有更好的跟踪精度和多径电阻。尽管ChPN的跟踪精度比具有相同MLB的二进制偏移载波（BOC）的跟踪精度稍差，但由于其较低的ACF峰值，ChPN产生的ACF峰模糊度较小。而且，ChPN提供了比BOC更好的整体抗多径性能。对于具有相同码率的ChPN信号，具有较大扫描带宽的信号在大多数方面都具有较好的性能。在工程实践中，可以通过对BOC接收器进行较小的修改来实现ChPN接收器。因此，ChPN调制显示了未来定位应用的希望。

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