【摘要】 作为GPS之外的一种全球卫星导航系统,Galileo有着自己当前独有的调制方式,这种新的调制引入了子载波分量并改变了自相关函数的性质,常用的GPS捕获算法在运用中将遇到问题,针对这一状况,提出了基于FFT循环相关的改进算法,先缩小了频率搜索范围,再对子载波及自相关函数的多峰性进行处理,并用实际数据检验,结果表明新算法有效。更多还原

【Abstract】 As a kind of new global satellite navigation system beside GPS,Galileo has its own unique modulation at the present time,which takes in the parameter(sub-carrier) and changes the function of autocorrelation,because of this,commonly used acquisition algorithm will encounter the obstacle.The strategy based on FFT is proposed to solve the problem that concerns subcarrier and multi-peak of the autocorrelation function after reducing the Doppler searching area,it is verified by testing the real data.更多还原