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To reduce the computations of parameters estimation in high-dynamic and long integration global navigation satellite system(GNSS) signal detection applications,the authors propose a low-computation GNSS acquisition method (LGAM) suitable for high-dynamic environment. The goal of LGAM is to apply the synthetic Doppler frequency hypothesis testing (SDHT) method to the acquisition of high dynamic GNSS signals with Doppler rate and bit flipping. Firstly,sparse Doppler frequency(SDF) process is implemented by coarse Doppler estimation,and post-correlation signal model is derived based on SDF structure. Then,in order to improve the detection efficiency of Doppler and Doppler rate, double-FFT based detection is proposed based on the post-correlation signal model for parameters estimation. The results demonstrate that in high dynamic environments, when the signal-to-noise ratio (SNR ) is higher than -43 dB, the computational complexity based on FFT method is 15 times that of LGAM1 and 780 times that of LGAM2.
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为了减少在高动态、长积分时间环境下全球卫星导航系统(Global Navigation Satellite System,GNSS)信号检测方法在估计参数时的计算量,提出了适用于高动态环境的低复杂度GNSS捕获方法(Low-computation GNSS Acquisition Method,LGAM),将同步多普勒频率假设检验方法(Synthesized Doppler Frequency Hypothesis Testing,SDHT)应用于具有多普勒变化率和比特翻转的高动态GNSS信号捕获中。首先,通过多普勒粗搜索来实现稀疏多普勒(Sparse Doppler Frequency,SDF)过程,并且基于SDF信号结构,推导了后相关信号模型。然后,为了提高多普勒和多普勒变化率检测效率,提出了基于后相关信号模型的双快速傅里叶变换(Fast Fourier Transform,FFT)参数估计方法。实验结果表明,在高动态环境下,信噪比(Signal-to-Noise Ratio,SNR)高于-43 dB时,基于FFT方法的计算量是LGAM1的15倍,是LGAM2的780倍。
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吴亿 男,1999年生于安徽芜湖,2021年获学士学位,现为硕士研究生,主要研究方向为高动态导航信号参数估计。
吴超 男,1988年生于河北邢台,2016年获博士学位,现为副教授,主要研究方向为导航信号处理,主要涉及导航软件接收机捕获、跟踪算法。
钱飞杰 男,1999年生于浙江绍兴,2022年获学士学位,现为硕士研究生,主要研究方向为高动态导航信号参数估计。
林秀苇 男,2001年生于浙江温州,2022年获学士学位,现为硕士研究生,主要研究方向为高动态导航信号参数估计。
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吴亿 男,1999年生于安徽芜湖,2021年获学士学位,现为硕士研究生,主要研究方向为高动态导航信号参数估计。
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吴超 男,1988年生于河北邢台,2016年获博士学位,现为副教授,主要研究方向为导航信号处理,主要涉及导航软件接收机捕获、跟踪算法。
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10(2):21-23., articleTitle=Application and accuracy analysis of GNSS-RTK technology in data acquisition, refAbstract=null)], funds=null, companyList=[AuthorCompany(id=1251226715012415932, tenantId=1146029695717560320, journalId=1251194772300279900, articleId=1251226692463837740, xref=null, ext=[AuthorCompanyExt(id=1251226715020804541, tenantId=1146029695717560320, journalId=1251194772300279900, articleId=1251226692463837740, companyId=1251226715012415932, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=School of Communication Engineering,Hangzhou Dianzi University,Hangzhou 310018,China), AuthorCompanyExt(id=1251226715024998846, tenantId=1146029695717560320, journalId=1251194772300279900, articleId=1251226692463837740, companyId=1251226715012415932, language=CN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=杭州电子科技大学 通信工程学院,杭州 310018)])], figs=[ArticleFig(id=1251226718451745277, tenantId=1146029695717560320, journalId=1251194772300279900, articleId=1251226692463837740, language=EN, label=null, caption=null, figureFileSmall=GqWBiu8LdTYrrXd14lHl9w==, figureFileBig=qXNwu0fTpdVkfDIVUR2/dw==, tableContent=null), ArticleFig(id=1251226718518854143, tenantId=1146029695717560320, journalId=1251194772300279900, articleId=1251226692463837740, language=CN, label=图1, caption=
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IF GPS L1 C/A信号获取示意, figureFileSmall=0gW8OXreHJbrlhZLrgZSxw==, figureFileBig=of6k7ie0ZzXWyT0/ZkECFg==, tableContent=null), ArticleFig(id=1251226719261245970, tenantId=1146029695717560320, journalId=1251194772300279900, articleId=1251226692463837740, language=EN, label=null, caption=null, figureFileSmall=hD6yNYpl6T/CKWpU/UJc3g==, figureFileBig=Y7d6J7giA9X2ZEBqY+VGZg==, tableContent=null), ArticleFig(id=1251226719332549140, tenantId=1146029695717560320, journalId=1251194772300279900, articleId=1251226692463837740, language=CN, label=图6, caption=
总MAC对比(S表示仿真曲线,T表示理论曲线), figureFileSmall=hD6yNYpl6T/CKWpU/UJc3g==, figureFileBig=Y7d6J7giA9X2ZEBqY+VGZg==, tableContent=null), ArticleFig(id=1251226719403852310, tenantId=1146029695717560320, journalId=1251194772300279900, articleId=1251226692463837740, language=EN, label=null, caption=null, figureFileSmall=null, figureFileBig=null, tableContent=
| α0 | 算法 | μp | μfL |
|---|
| 0 | LGAM1 | TNtlb Nt | 0.5(Df+1)Nc1 |
| SDHT | TNtlb Nt | 0.5(Df+1)Ncs |
| 不等于0 | LGAM2 | TNtlb Nt | 0.5(Df+1)Nc2 |
| DCFT | TNtlb Nt | 0.5(Df+1)Ncd |
), ArticleFig(id=1251226719483544088, tenantId=1146029695717560320, journalId=1251194772300279900, articleId=1251226692463837740, language=CN, label=表1, caption=
算法的总MAC下界比较
, figureFileSmall=null, figureFileBig=null, tableContent=
| α0 | 算法 | μp | μfL |
|---|
| 0 | LGAM1 | TNtlb Nt | 0.5(Df+1)Nc1 |
| SDHT | TNtlb Nt | 0.5(Df+1)Ncs |
| 不等于0 | LGAM2 | TNtlb Nt | 0.5(Df+1)Nc2 |
| DCFT | TNtlb Nt | 0.5(Df+1)Ncd |
), ArticleFig(id=1251226719567430170, tenantId=1146029695717560320, journalId=1251194772300279900, articleId=1251226692463837740, language=EN, label=null, caption=null, figureFileSmall=null, figureFileBig=null, tableContent=
| 参数 | 设置 |
|---|
| 数据比特周期NB | 20 |
| 每个码周期采样点数Nt | 2046 |
| 多普勒变化范围/kHz | [-10,10] |
| 剩余多普勒变化范围/Hz | [-250,250] |
| 多普勒变化率范围/(Hz/s) | [-500,500] |
| FAP | 0.0002 |
| 采样时间Ts/ms | 1 |
| 最后估计的多普勒频率分辨率/Hz | 500/T |
| 估计的多普勒变化率分辨率 | 1/NBTs |
| 信道 | 高斯白噪声信道 |
| 蒙特卡罗仿真次数 | 10000 |
), ArticleFig(id=1251226719638733340, tenantId=1146029695717560320, journalId=1251194772300279900, articleId=1251226692463837740, language=CN, label=表2, caption=
仿真参数
, figureFileSmall=null, figureFileBig=null, tableContent=
| 参数 | 设置 |
|---|
| 数据比特周期NB | 20 |
| 每个码周期采样点数Nt | 2046 |
| 多普勒变化范围/kHz | [-10,10] |
| 剩余多普勒变化范围/Hz | [-250,250] |
| 多普勒变化率范围/(Hz/s) | [-500,500] |
| FAP | 0.0002 |
| 采样时间Ts/ms | 1 |
| 最后估计的多普勒频率分辨率/Hz | 500/T |
| 估计的多普勒变化率分辨率 | 1/NBTs |
| 信道 | 高斯白噪声信道 |
| 蒙特卡罗仿真次数 | 10000 |
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