A deep space carrier signal acquisition technology based on two-dimension FFT (Fast Fourier Transform)both on frequency and frequency variation,and a time division multiplexing structure based on engineering application are proposed to improve signal acquisition by deep space TT&C (Tracking,Telemetry and Command) communication systems as the signals received by ground stations usually have a low SNR (Signal-to-Noise Ratio) and large dynamic range.Simulation and test results show excellent performance of the proposed technology at low SNR with high dynamic adaptive capacity.It is capable of rapid carrier acquisition while C/N0 equals to 16 dBHz and dynamic range is up to 800 Hz/s.Therefore,the technology can be used in deep space communication systems.%针对深空测控通信系统中,地面站接收信号的信噪比低、频率动态大,载波信号捕获难度较大的问题,提出一种基于频率和频率变化率进行二维FFT(快速傅里叶变换)搜索的深空载波信号捕获技术,同时结合工程应用提出一种基于时分复用结构的实现方法,并进行仿真.仿真结果表明,该捕获技术在低信噪比和高动态适应能力方面具有优异的性能,能够在载噪比为16 dBHz时,完成对频率变化率为800 Hz/s的信号快速捕获,其技术成果可应用于我国深空测控通信系统.
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