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奈奎斯特折叠接收机(NYFR)为一种新颖的超宽带接收机结构,它可以利用单片ADC实现超宽带范围内信号的采集,而同步奈奎斯特折叠接收机(SNYFR)为其一种改进结构。文章针对SNYFR难于实现的缺点,提出了一种双路多本振的SNYFR结构。并在此结构下提出了基于正弦调频匹配(SFMM)的多分量单频信号奈奎斯特区域(NZ)判定算法,同时给出了相应参数估计方法。经计算机仿真证明,在监测带宽为S+C+X波段的情况下,该结构结合文中提出的算法可以有效地对多分量单频信号进行检测并实现各分量参数的高精度估计。
The Nyquist Folding Receiver (NYFR) is a novel ultra-wideband receiver architecture that utilizes a monolithic ADC for ultra-wideband signal acquisition, and the Synchronous Nyquist Folding Receiver (SNYFR) An improved structure. In order to overcome the shortcomings of SNYFR, a SNYFR structure with two paths and multiple local oscillation is proposed. Based on this structure, the Nyquist zone (NZ) decision algorithm based on sinusoidal frequency modulation matching (SFMM) is proposed and the corresponding parameter estimation method is given. Computer simulation shows that the proposed algorithm can effectively detect multi-component single-frequency signals and achieve high-precision estimation of the component parameters when the monitoring bandwidth is S + C + X band.