基于雙本振同步Nyguist折疊接收機(jī)的多分量LFM信號(hào)檢測(cè)及參數(shù)估計(jì)
doi: 10.11999/JEIT140281 cstr: 32379.14.JEIT140281
Multi-component LFM Signal Detection and Parameter Estimation Algorithm Based on Synchronous Nyquist Folding Receiver with Dual Local Oscillator
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摘要: Nyquist折疊接收機(jī)(NYFR)為一種新穎的超寬帶接收機(jī)結(jié)構(gòu)，它可以利用單片ADC實(shí)現(xiàn)超寬帶范圍內(nèi)信號(hào)的采集，而同步Nyquist折疊接收機(jī)(SNYFR)為其一種改進(jìn)結(jié)構(gòu)。該文在此基礎(chǔ)上提出一種新的基于雙本振方案的SNYFR結(jié)構(gòu)，推導(dǎo)了多分量LFM輸入下的數(shù)學(xué)模型。并基于此結(jié)構(gòu)，提出一種基于正弦調(diào)頻匹配(SFMM)與分?jǐn)?shù)階域折疊補(bǔ)償相結(jié)合的多分量LFM信號(hào)奈奎斯特區(qū)域(NZ)判定與參數(shù)估計(jì)算法，克服了單本振SNYFR結(jié)構(gòu)處理多分量LFM輸入時(shí)的困難，提高了NZ判定及參數(shù)估計(jì)的抗噪聲性能。計(jì)算機(jī)仿真表明，該文算法可以有效地對(duì)多分量LFM信號(hào)進(jìn)行檢測(cè)并實(shí)現(xiàn)各分量參數(shù)的高精度估計(jì)。
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關(guān)鍵詞:
- 超寬帶接收機(jī) /
- 奈奎斯特折疊接收機(jī) /
- 正弦調(diào)頻匹配 /
- 分?jǐn)?shù)階傅里葉變換
Abstract: 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 multi- component LFM signal and accurate parameters estimation can be achieved by using the proposed algorithm. -
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