用于GNSS信号的可变相干积累时长的时频域结合捕获算法

对于全球导航卫星信号的捕获问题,设计了一种可变相干积累时长的时频域结合捕获算法,在延长相干积累时间的同时,等效提高了FFT运算的点数,从而保证了算法不会增加额外的FFT损耗,提升信号的检测性能。蒙特卡洛仿真验证了可变相干积累时长捕获算法的正确性和有效性,得出了文中所提出的算法可以通过延长信号的相干积累时长,提升导航信号捕获性能,但带来的代价是增加了算法的计算负荷。 

A Changed Coherent Integraltime of the Delay frequency Combined Acquisition Algorithm for GNSS Signal

To acquire the Global Navigation Satellite System signal, we design a changed coherent integraltime of the delay frequency combined acquisition algorithm. While prolonging the coherent time, the FFT points also can be added for equivalence, so the acquisition performance can be improved. The Monte Carlo simulations check the validity of this changed coherent integrationtime acquisition algorithm, and we get the conclusion that the improved performance of this algorithm can be achieved.