一种改进的深空高动态微弱信号频率捕获算法  

An Improved Frequency Acquisition Algorithm for High Dynamic and Weak Signal in Deep Space

作　　者：甘浩[1] 张晓林[1] 马月红[1] 徐驰[1] 李赞[2] 

机构地区：[1]北京航空航天大学,北京100191 [2]北京跟踪与通信技术研究所,北京100094

出　　处：《遥测遥控》2015年第4期6-11,共6页Journal of Telemetry,Tracking and Command

基　　金：国家863计划(2013AA7034055A);总装十二五装备预研项目(51306040401)

摘　　要：分析传统的基于极大似然法的高动态微弱信号频率捕获算法,深入研究发现,在高动态条件下求平均周期图的时候存在多普勒频率变化率差值,使得信号非相干累加无法达到最佳效果。针对此问题,提出一种频域循环移位累加求周期图的改进算法,在相同多普勒动态范围及多普勒频率变化率条件下,提升信号频率捕获性能。The traditional algorithm based on the maximum likelihood method for the frequency acquisition of high dynamic and weak signal is analyzed. The in-depth study shows that the Doppler frequency rate difference exists when the average periodogram is calculated under the condition of high dynamic, which makes non-coherent accumulation of signals unable to achieve the best effect. For this problem, an improved algorithm executing cyclic shift accumulation in frequency domain is proposed in the periodogram cal- culation. Under the same conditions of Doppler frequency dynamic and Doppler frequency rate, the signal frequency acquisition per- formance is enhanced with the proposed algorithm.

关 键 词：深空通信 高动态微弱信号 极大似然法 频率捕获 

分 类 号：TN911.23[电子电信—通信与信息系统]