中文摘要：

针对长时间积累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,该文提出一种联合变窗长相干平均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。首先基于分段相干的思想采用变窗长相干平均法提高信噪比的增益,然后利用循环平稳法完成信号的检测和参数估计。该算法以较低计算复杂度实现信号的长时间积累,并且解决了起始时间给信号检测和参数估计带来的问题,在低信噪比条件下具有较好的估计性能。仿真结果验证了方法的有效性。

英文摘要：

Considering application of long time accumulation to the detection and parameter estimation of Linear Frequency Modulated Continuous Wave（LFMCW）,a novel method based on the joint window-variant coherent average method and cyclostationary method is proposed to detect LFMCW signal and estimate its parameters.Firstly,the improvement of Signal-to-Noise Ratio（SNR） gain is extracted with window-variant coherent average method based on segmentation coherent.And then,cyclostationary method is utilized to finish the detection and parameters estimation of LFMCW signal.The algorithm realizes long time accumulation with low computational complexity and solves the problem brought by initial time-offset.On the low SNR condition,this method still has better estimation performance.Simulations verify the effectiveness of the method.