摘要
针对深空探测对高灵敏度载波接收的需求,提出了一种高灵敏度载波捕获方法。窄带锁相环本身对载波的捕获与跟踪能力有限,因此需要对高动态多普勒变化的信号进行预先捕获处理。在分析快速傅立叶变换(Fast Fourier Transformation,FFT)估计载波捕获模型和时域扫频补偿算法的基础上,利用信号处理的时频等效原理和扫频补偿作用的累加效应,设计频域扫频补偿的步进迭代算法,可极大降低原时域算法的复杂度,具有较强的工程实用价值。
In order to meet the demand of high-sensitivity carrier reception for deep space exploration, a high-sensitive carrier acquisition method is proposed. Due to the limited capacity of the carrier acquisition and tracking by narrowband phase locked loop, it is necessary to pre-process the highly-dynamic and doppler signal. In the analysis of carrier acquisition model and time-domain sweep frequency compensation algorithm based on FFT（fast fourier transformation） estimation, the cumulative effect of signal processing time frequency and sweep frequency compensation equivalent principle is used to design the sweep frequency compensation step iterative algorithm. It can greatly reduce the complexity of original algorithm in time domain and thus is valuable in engeering practice.
作者
袁晨曦
井俊
马文峰
YUAN Chen-xi JING Jun MA Wen-feng(Institute of Communication Engineering, PLAUST, Nanjing Jiangsu 210007, China Postdoctoral Research Station of PLA Unit 66393, Baoding Hebei 071000, China)
出处
《通信技术》
2017年第4期609-612,共4页
Communications Technology
关键词
高灵敏度
FFT估计
扫频补偿
载波捕获
high sensitivity
FFT estimation
frequency compensation
carrier acquisition
