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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16dBHz时,完成对频率变化率为800Hz/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。
Aiming at the problem of low signal-to-noise ratio (SNR) and dynamic frequency of received signal in ground station, it is very difficult to capture the carrier signal in deep space monitoring and control communication system. A two-dimensional FFT (Fast Fourier Transform) ) Search of deep space signal acquisition technology, combined with engineering applications based on a time-division multiplexing structure of the implementation method, and simulation. The simulation results show that the acquisition technology has excellent performance in low signal-to-noise ratio and high dynamic adaptability, and can quickly capture a signal with a frequency change rate of 800 Hz / s at a carrier-to-noise ratio of 16 dBHz. The technical achievements Used in China’s deep space monitoring and control communications system.