宽带雷达中频直接采样信号数字去线性调频方法

摘要

为了改善模拟Dechirp方法的接收信号质量,降低中频直接采样匹配滤波处理的运算量,结合这两种方法的优点提出了数字Dechirp实时处理方法.通过理论分析与推导得出数学模型,再从实现的角度详细分析了数据抽取、滤波器设计等问题,同时介绍了适用于数字Dechirp的系统失真补偿方法.仿真与实测数据证明该方法是一种可行、高效的实时脉冲压缩方法.%In order to improve the quality of the signal obtained by analog Dechirp method and reduce the computation load of matched filtering after direct IF (Intermediate frequency) sampling, a digital Dechirp method combing the benefits of these two methods is proposed in this paper. By theoretical analysis, the mathematical model is obtained, and the data decimation and the fdter design are also analyzed in detail for the realization of method provided in this paper. Compensation approach for the system distortion is also proposed. Simulation and analysis based on measured data prove the effectiveness and efficiency of the proposed strategy.