CAJ | 학술논문

在超宽带穿墙雷达压缩感知成像中，常常使用Rademacher序列作为模拟信息转换器的chipping序列。而这种序列的功率谱类似于高斯白噪声的功率谱，它与回波信号的功率谱不匹配，导致低速采样前信号的信噪比偏低，最终影响了成像效果。文章从低速采样前的平均信噪比最大化入手，构建设计匹配chipping序列的优化算法以导出其成立的条件，给出一种使用马尔科夫链游程长度受限（RLL）序列来设计匹配chipping序列的解决方案。仿真结果表明，使用马尔科夫链RLL序列设计匹配chipping序列的成像结果优于Rademacher序列，其图像的信噪比提高2～3dB。
재초관대천장뢰체압축감지성상중，상상사용Rademacher서렬작위모의신식전환기적chipping서렬。이저충서렬적공솔보유사우고사백조성적공솔보，타여회파신호적공솔보불필배，도치저속채양전신호적신조비편저，최종영향료성상효과。문장종저속채양전적평균신조비최대화입수，구건설계필배chipping서렬적우화산법이도출기성립적조건，급출일충사용마이과부련유정장도수한（RLL）서렬래설계필배chipping서렬적해결방안。방진결과표명，사용마이과부련RLL서렬설계필배chipping서렬적성상결과우우Rademacher서렬，기도상적신조비제고2～3dB。
In the UWB through-the-wall radar imaging with compressed sensing, The Rademacher sequence is the chipping sequence of Analog-to-Information Conversion (AIC) in general. Its power spectrum is similar to the power spectrum of Gauss white noise, and mismatched with the power spectrum of receive signal. This will lead to a decrease in SNR before sampling at low speed, and then reduce the imaging quality. In this paper, a kind of sequence that the power spectrum is matched with the power spectral of received signal is designed from maximum of the signal to noise ratio before sampling at low speed. In addition, we show a design scheme of matching chipping sequence that is a Markov-generated Run-Length Limited (RLL) sequence. The results of simulations show that the through-the-wall imaging performance with the proposed sequence is better than traditional Rademacher sequence actually, and the signal-to-noise ratio of imaging improves about from 2dB to 3dB.