基于FFT的直扩系统的快捕技术

Fast acquisition of DS system based on FFT

针对动态环境下直扩系统捕获时间长的问题,提出了利用分段相关和FFT技术减少捕获时间的方法;通过虚警概率和检测概率的推导,计算了基于FFT的直扩系统的快捕技术对捕获时间减少的倍数.计算结果表明,8点FFT变换的平均捕获时间为标准相关器的1/16,可提高系统捕获时间.

Because the capture time is long in dynamic environment for direct sequence spread spectrum system,Segment Correlation and FFT technology was used to reduce capture time.The detecting probability and false alarming rate were deducted,the computation result demonstrates that the average capture time of 8-points FFT is 1/16 that of the standard correlator.