| 引用本文： |
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王晓君,尚 燕,孙寿浩,等.基于MDBZP 的C/A码信号高灵敏捕获算法[J].电讯技术，2013，53（10）： - . [点击复制]
- WANG Xiao-jun,SHANG Yan,SUN Shou-hao,et al.High-sensitivity capture algorithm of C/A code signal based on modify double block zero padding[J].，2013，53（10）： - . [点击复制]
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| 摘要: |
| 卫星信号的捕获是GPS接收机信号处理的首要任务。针对在微弱信号的情况下传统捕获方法不能很好地捕获到卫星信号的问题，提出一种改进的二倍分组块补零（MDBZP）方法为高灵敏度GPS接收机提供理论依据。该方法将连续相干积分分解成普通循环相关和随后的傅里叶变换来产生不同的多普勒频移搜索，并针对连续积分跨越多个导航电文数据位的情况给出解决方案，同时考虑了多普勒效应对码长造成的影响。仿真结果表明，此方法对低至15dB-Hz的微弱信号C/A码信号仍有较好的捕获能力。最后给出了不同载噪比情况下所对应的检测信噪比。 |
| 关键词: GPS接收机 微弱信号处理 粗捕获码 高灵敏捕获 修改的二倍分组块补零 |
| DOI： |
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| 基金项目:河北科技大学校立基金项目（XL201064） |
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| High-sensitivity capture algorithm of C/A code signal based on modify double block zero padding |
| WANG Xiao-jun,SHANG Yan,SUN Shou-hao,QIU Jun |
| () |
| Abstract: |
| Signal capture is the first task of signal processing in GPS receiver.Sometimes,GPS signals are too weak to be received or processed by traditional FFT methods.A method of Modify Double Block Zero Padding (MDBZP) is presented to solve the problem of weak signal acquisition for high-sensitivity GPS receivers.At the same time,the solution with respect to continuous integration time crossing multiple data bits of navigation message is also provided and the influence of Doppler effect on code length is taken into account.The simulation results show that the method is better to capture weak GPS C/A-code signal whose carrier noise ratio is even low to 15 dB-Hz. Finally,the detection SNRs are given corresponding to different CNRs. |
| Key words: GPS receiver weak signal processing C/A code high-sensitivity capture MDBZP |
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