基于双本振同步Nyguist折叠接收机的多分量LFM信号检测及参数估计

Multi-component LFM Signal Detection and Parameter Estimation Algorithm Based on Synchronous Nyquist Folding Receiver with Dual Local Oscillator

Nyquist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Nyquist折叠接收机(SNYFR)为其一种改进结构。该文在此基础上提出一种新的基于双本振方案的SNYFR结构,推导了多分量LFM输入下的数学模型。并基于此结构,提出一种基于正弦调频匹配(SFMM)与分数阶域折叠补偿相结合的多分量LFM信号奈奎斯特区域(NZ)判定与参数估计算法,克服了单本振SNYFR结构处理多分量LFM输入时的困难,提高了NZ判定及参数估计的抗噪声性能。计算机仿真表明,该文算法可以有效地对多分量LFM信号进行检测并实现各分量参数的高精度估计。

NYquist Folding Receiver（NYFR） is a novel ultra-wideband receiver structure, which can sample a large range wideband signal by using a single ADC. The Synchronous NYquist Folding Receiver（SNYFR） is an improved structure of NYFR. In this paper, a new SNYFR structure with dual local oscillator is proposed and its mathematical model with the input of multi-component LFM signal is deduced. meanwhile, under the input of multi-component LFM signal, a Nyquist Zone（NZ） judgment and parameters estimation algorithm based on combination of Sinusoidal Frequency Modulation Matching（SFMM） and fractional domain folding compensation is proposed to overcome the difficulties of single local oscillator SNYFR structure in dealing with multi-component LFM signal and to improve noise immunity. Computer simulations show that effective detection of multicomponent LFM signal and accurate parameters estimation can be achieved by using the proposed algorithm.