基于FFT/IFFT的弱信号捕获方法研究  

The research of weak signal acquisition algorithm based on FFT/IFFT

作　　者：袁先举 卢艳娥[2] 

机构地区：[1]贵州大学大数据与信息工程学院,贵州贵阳550025 [2]中国科学院重庆绿色智能技术研究院北斗导航中心,重庆400714

出　　处：《电子设计工程》2016年第5期126-129,共4页Electronic Design Engineering

摘　　要：为了缩短捕获时间,提高对微弱信号的检测能力,利用FFT/IFFT方法代替传统时域串行相干累积,相干累积之后的处理,提出采用各个相干累积值相乘取模的方法提升检测量,最后进行门限比较。该方法在提高信噪比的同时且计算量更少,平方损耗小。仿真实验表明,检测量提升比非相干方法快,检测概率比非相干大,门限设置范围更广,可用于捕获GPS和北斗等GNSS卫星微弱信号。In order to shorten acquisition time and improve the ability to detect weak signals using FFT / IFFT method instead of the traditional time-domain serial coherent accumulation, After coherent accumulated processing is proposed using various coherence cumulative value multiplied modulo method to enhance the detection volume, Finally, to compare with the threshold, which at the same time to improve the signal to noise ratio and the calculation of the amount of less-squares loss. Simulation results show that,using FFT/IFFT method can make detection of increased faster,detection probability larger and threshold setting range wider compared with non-coherent detection method. It can be used to capture GPS and compass GNSS satellite weak signal.

关 键 词：微弱信号捕获 提升检测量 相干值相乘 FFT/IFFT 

分 类 号：TN966[电子电信—信号与信息处理]