基于频域的软件接收机多普勒补偿算法

由于卫星和接收机之间存在的相对运动,在接收机使用过程中必然会引入多普勒频移。而多普勒频移将导致扩频增益发生衰减,影响捕获工作的完成,因此在捕获过程必须进行相应的补偿处理,去除多普勒频移所产生的影响。本文以时域复指数相乘等于频域偏移原理为基础,采用频域补偿算法替代时域串行搜索算法改进捕获算法,简化了计算过程,节省了频域变换处理计算量,通过实际算例证明有效可行。

Doppler Compensation Algorithm for Software Receiver Based on Frequency Domain

Because of the relative movement between the satellites and receiver,there is doppler effect when using the receiver.The doppler frequency can result in the spread gain low and effect the accomplishment of acquisition.In order to accomplish the signal acquisition,it must remove the effect of the doppler frequency.In this paper,the time domain serial search algorithm is substituted with the frequency domain doppler compensation algorithm based on the theory that time domain complex exponent multiply equals the frequency domain shift.The new algorithm simplifies the computer process and saves the computation load of frequency domain converting.It is proved to be effective by experiments.