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第三届中国卫星导航学术年会

作者： Zhengwen Zhang* Yanhong Kou Jiansheng Liu Jingtao Sui School of Electronic and Information Engineering Beihang University Beijing P.R.China

The high-order binary offset carrier （BOC） modulation can make full use of the allocated frequency spectrum resource to improve the compatibility with other GNSS signals in the same band, the anti-multipath capability and the code tracking accuracy. High-order BOC signals have been adopted by Galileo and COMPASS system. The distortions of high-order BOC signals and their impacts on signal performance need to be further explored. Based on the 2nd-order threat model of Evil Waveform （2OS EWF） proposed by ICAO, three types of threat mode--TMA, TMB, and TMC for BOC signals are modeled in this paper. The impacts of various models and parameters on the correlation function are analyzed. Next, the code tracking biases are calculated under different combinations of threat modes, distortion parameters, and correlator spacing. Finally, the optimum selections of correlator spacing for receivers are proposed based on simulation results.

关键词： High-order BOC modulation signal distortion 2nd-order threat model of Evil Waveform (2OS EWF) code tracking bias correlator spacing

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Sinc interpolation based method for compensation of ionospheric dispersion effects on BOC signals with high subcarrier rate

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Science China(Information Sciences) 2016年第10期59卷 152-168页

作者： Hang RUAN Lei ZHANG Teng LONG Key Laboratory of Electronic and Information Technology in Satellite Navigation (Beijing Institute of Technology) Ministry of Education School of Information and Electronics Beijing Institute of Technology

Binary Offset Carrier(BOC) signals with high subcarrier rate such as Alt BOC(15,10) and cosBOC(15,2.5) have been adopted for the next generation of Global Navigation Satellite System(GNSS) to make full use of the allocated spectrum. However, the two main lobes of the BOC signals are tremendously separated in the frequency spectrum and the group delay of the two lobes are greatly dispersed due to ionospheric dispersion. The signals will suffer extremely severe distortion caused by the group delay dispersion including waveform ripples, power losses and correlation function asymmetries. In this paper, a novel time domain sinc interpolation based ionospheric dispersion compensation method is proposed to eliminate the distortion to the BOC ***, the time domain model of BOC signal under the dispersive ionosphere is developed. Afterwards, based on the model, the two signal main lobes are aligned by sinc interpolation so that the ionospheric dispersion effects are almost mitigated. Taking Galileo E5 Alt BOC(15,10) signal as an example, the performance of the proposed method is evaluated by simulation and test. The results show that the proposed method is able to more effectively compensate the ionospheric dispersion with fewer computational loads versus existing methods.

关键词： ionospheric dispersion sinc interpolation BOC code tracking bias high subcarrier rate

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Analog Distortion of Wideband Signal in Satellite Navigation Payload

Analog Distortion of Wideband Signal in Satellite Navigation...

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第三届中国卫星导航学术年会

作者： Yibo Chen Yanhong Kou Zhengwen Zhang School of Electronic and Information Engineering Beihang University Beijing China

The non-ideal components in the navigation signal generation chain of a GNSS satellite payload can induce various signal distortions, which lead to ranging error and impact positioning accuracy. This paper investigates the non-ideal characteristics of analog components in the payload including the up-convertor, filter, HPA, and OMUX. We establish the distortion model of the analog signal generation chain, and propose the simulation methods for phase noise and HPA memory effect, as well as the performance evaluation formulation. Then the distortions of the most demanding AltBOC（15,10） signal after each component are analyzed in the frequency, modulation, and correlation domains. The code phase and carrier phase tracking errors are further assessed. The simulation results quantify the impact of each non-ideal component on the signal performance. The study provides a useful reference for the design and evaluation of navigation signal and payload as well as the specification of satellite signal quality.

关键词： satellite payload navigation signal quality phase noise nonlinear distortion code tracking bias

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