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一种低信噪比条件下的深空探测载波捕获算法
杜检来, 方堃, 刘刚, 李琦
上海航天电子有限公司, 上海 201821
摘要:
针对深空测控通信系统中,接收端收到的载波信号信噪比极低的特点,提出了一种时分复用的二维FFT载波捕获方法。该方法在降低资源消耗的情况下,能够有效实现低信噪比条件下的载波捕获。仿真实验表明,使用此种方法,能够在载噪比为17 dBHz的条件下,完成对载波频偏最大为100 kHz、载波频率变化率最大为100 Hz/s的载波信号的快速捕获,是一种兼顾性能和工程应用的捕获方法。
关键词:  载波捕获;二维快速傅里叶变换;时分复用;资源消耗
DOI:10.15982/j.issn.2095-7777.2018.02.008
分类号:V443+.1
基金项目:
A Deep Space Exploration Carrier Capture Algorithm with Low SNR
DU Jianlai, FANG Kun, LIU Gang, LI Qi
Shanghai Aerospace Electronic Co., Ltd., Shanghai 201821, China
Abstract:
Aimed at the extremely low Signal-Noise-Ratio(SNR)of the carrier signal received by receiving end in the deep space monitoring and control communication system,a two-dimensional time division multiplexing fast Fourier transform(FFT)carrier acquisition method is proposed. The carrier capture can be achieved effectively at low SNR while reducing resource consumption. Simulation results show that this method can be used to achieve fast acquisition of a carrier signal with carrier frequency offset up to 100 kHz and carrier frequency change rate up to 100 Hz/s under the carrier-noise-ratio(CNR)of 17 dBHz. It is a capture method that takes both performance and engineering into account.
Key words:  carrier capture;2D-FFT;time-division multiplexing;resource consumption