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Nyquist折叠接收机(NYFR)为一种新型侦察接收机结构,可利用单/双片模数转换器(ADC)同时完成多Nyquist区域内的宽频段信号采集。本文对NYFR结构进行了改进,提出了多分量信号的参数估计算法。首先,引入了同步结构,对NYFR进行了改进,得到了同步NYFR(SNYFR);其次,以本振为周期性线性调频(LFM)为例,分析了多分量信号的输出结果;然后,提出了去斜函数(DF)以用于检测信号的Nyquist区域;最终,根据区域信息完成了信号的各参数估计。计算量分析与仿真表明,所提算法计算量小且在信噪比(SNR)优于-9dB时性能已接近克拉美-罗(CRLB)下限。
The Nyquist Folding Receiver (NYFR) is a new reconnaissance receiver architecture that enables the simultaneous acquisition of wideband signals in multiple Nyquist zones using a single / dual-chip analog-to-digital converter (ADC). In this paper, the structure of NYFR is improved, and the parameter estimation algorithm of multi-component signal is proposed. Firstly, the synchronization structure was introduced to improve the NYFR and get the synchronized NYFR (SNYFR). Secondly, the output of the multi-component signal was analyzed with the local oscillation as the periodic LFM. Then, The deskew function (DF) is used to detect the Nyquist region of the signal; finally, the parameters of the signal are estimated based on the region information. Computational analysis and simulation show that the proposed algorithm is less computationally intensive and its performance is close to the CRLB limit when the SNR is better than -9dB.