analog front-end meaning in Chinese

模拟前端

And the performance of these algorithms is compared with each other . to simplify the sampling rate design and digital processing in receiver , we prefer to use the direct down conversion structure . the problem is the analog front - end in this structure will bring iq mismatch , which will effect the phase of recovered carrier and code
第三部分对接收机中的载噪比估计算法进行了分析,目前gps导航接收机中采用的载噪比估计算法对残余多普勒非常敏感,而且gps中的数据速率为50bps ,北斗二代中的存在数据速率为500bps ,应用条件的差异导致该算法的不可用。