论文部分内容阅读
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。
Aiming at the demand of high-sensitivity carrier reception in deep space exploration, a high-sensitivity carrier acquisition method is proposed. Narrowband phase locked loop itself has limited ability to capture and track the carrier, so it needs to pre-process the signal with high dynamic Doppler shift. Based on the analysis of FFT (Fast Fourier Transform) estimation carrier acquisition model and time-domain sweep compensation algorithm, the time-frequency equivalent principle of signal processing and the cumulative effect of sweep compensation are used to design the frequency sweep Compensation step-by-step iterative algorithm can greatly reduce the complexity of the original time domain algorithm, with strong engineering practical value.