机载雷达跟踪目标丢失现象的重要因素之一是由于雷达载机与目标之间的相对运动 ,在回波信号中产生线性调频项 ,线性调频项对多普勒频率和距离门估计产生了积累误差 ,最终导致跟踪目标丢失。提出了应用变采样率技术估计线性调频项参数来减小距离跟踪的误差 ,提高雷达的跟踪目标性能。同时还进行了具体的理论分析和计算机仿真 ,结果表明该技术是有效的。 One of the important factors in airborne radar tracking of target loss is the generation of chirp in the echo signal due to the relative movement between the radar carrier and the target. The chirp results in accumulation of Doppler frequency and range gate estimation The error eventually leads to the loss of the tracking target. The variable sampling rate technique is used to estimate the chirp parameters to reduce the error of distance tracking and improve the tracking performance of the radar. At the same time, a specific theoretical analysis and computer simulation were carried out. The result shows that this technique is effective.