基于FPGA的扩频信号的相位解旋

Phase Helicase for Spread Spectrum Signal Based on FPGA

中文关键词:  FPGA  相位解旋  正交下变频  载波NCO

英文关键词:FPGA  phase helicase  quadrature downconversion  carrier NCO

中文摘要:

      GPS与GLONASS二合一卫星导航接收机中相位解旋（载波剥离）方案的选取和实现对基带信号处理的实现和定位解算的稳定度和精度有很大的影响，一般的相位解旋方案不能满足二合一接收机的实际情况。根据相位解旋的原理，针对二合一接收机的实际问题，选取复数对相位解旋方案，并在具体实现中对其结构进行改进。利用FPGA实现相位解旋的逻辑结构，通过前后仿真验证，应用在二合一实时接收机中，有效地简化了基带信号处理，提升了定位解算的稳定度和精度。

英文摘要:

      The program selection and implementation of phase helicase (carrier strip) affects the baseband signal processing and the stability and accuracy of position resolution greatly in GPS and GLONASS satellite navigation receiver.General phase helicase program can not meet the actual situation of the combo receiver.According to the principle of phase helicase and the practical problems of the combo receiver,the complex phase helicase program is selected,and improvements are achieved in particular in its structure.By using FPGA,the logical structure of the phase helicase is achieved,and function and timing simulation are completed.Applying this program in real-time combo receiver,the baseband signal processing is simplified effectively and the stability and accuracy of the position resolution are enhanced.