一种基于比特遍历的高动态BDS B3I信号捕获方法  

A Novel Acquisition Method of High Dynamic BDS B3I Signal Based on Bit Traversal

作　　者：李建武[1] 冯双记 LI Jianwu;FENG Shuangji(Wuhan National Laboratory for Optoelectronics,Huazhong Institute of Electro-Optics,Wuhan 430074,China)

机构地区：[1]华中光电技术研究所武汉光电国家研究中心,湖北武汉430074

出　　处：《无线电工程》2021年第9期927-932,共6页Radio Engineering

摘　　要：针对高动态下BDS B3I信号频繁比特跳变导致相干积分检测峰值分裂影响接收机捕获性能的问题,综合考虑捕获时间、算法复杂度以及硬件资源消耗,提出了一种基于比特遍历的分段匹配滤波(Partial Matched Filtering,PMF)和快速傅里叶变换(Fast Fourier Transform,FFT)捕获方法。将经过PMF处理的相关积分序列分前后两段,分别与(-1,+1)和(+1,+1)数据比特进行遍历,对遍历后的2组相关积分序列并行做FFT运算,取峰值最大值进行捕获门限判决。模拟环境仿真试验表明,该快速捕获方法可削弱频繁比特跳变对捕获造成的恶劣影响,并且算法复杂度低,硬件资源消耗少,适用于高动态的BDS B3I信号。Aiming at the problem under high dynamics that the coherent integration of acquisition is subject to frequent bit transition of the BDS B3I signal,which leads to peak-splitting of the detection value and affects the acquisition performance eventually,a fast acquisition method which is called Partial Matched Filtering(PMF)and Fast Fourier Transform(FFT)based on bit traversal is proposed after considering the acquisition time,algorithm complexity and hardware resource consumption.Firstly,the correlation integral sequence processed by PMF is divided into two segments,which is traversed with(-1,+1)and(+1,+1)respectively.Then,the FFT operation is performed synchronously on two traversal groups of correlation integral sequences.The simulation results show that the fast acquisition method proposed can mitigate the worst impact of frequent bit transition of the BDS B3I signal.Besides,the low complexity and hardware resource consumption indicate that the proposed method is suitable for high dynamic BDS B3I signal.

关 键 词：高动态 BDS B3I信号 比特遍历 捕获 

分 类 号：TN967[电子电信—信号与信息处理]