CAJ | 학술논문

针对长时间积累的方法较难在线性调频连续波信号的检测和参数估计中应用的问题，该文基于归一化变窗长相干平均法，提出一种联合帧间相关法与循环平稳法的线性调频连续波信号检测与参数估计算法。该方法首先利用归一化变窗长相干平均法实现噪声方差的一致性，然后在此基础上利用帧间相关法实现周期的精确估计，最后利用循环平稳法估计信号的相位参数。该算法以较低的计算复杂度实现信号的长时间积累，在低信噪比条件下具有较好的估计性能。仿真结果验证了该方法的有效性。
침대장시간적루적방법교난재선성조빈련속파신호적검측화삼수고계중응용적문제，해문기우귀일화변창장상간평균법，제출일충연합정간상관법여순배평은법적선성조빈련속파신호검측여삼수고계산법。해방법수선이용귀일화변창장상간평균법실현조성방차적일치성，연후재차기출상이용정간상관법실현주기적정학고계，최후이용순배평은법고계신호적상위삼수。해산법이교저적계산복잡도실현신호적장시간적루，재저신조비조건하구유교호적고계성능。방진결과험증료해방법적유효성。
To deal with the issue that the long time accumulation method is hard to be applied to the detection and parameter estimation of Linear Frequency Modulated Continuous Wave (LFMCW) signal, a novel algorithm combining the joint inter-frame correlation method and cyclostationary method is proposed to detect LFMCW signal and estimate its parameters. Firstly, consistency of noise variance is completed by the normalized window-variant coherent average method. Then, on this basis, the period is exactly estimated with inter-frame correlation method. Finally, cyclostationary method is utilized to estimate the phase parameters of LFMCW signal. The proposed algorithm realizes long time accumulation with low computational complexity. For low Signal-to-Noise Ratio (SNR), this method still achieves good estimation performance. Simulation results verify the effectiveness of the proposed method.