摘要
分析了高速运动目标的逆合成孔径雷达(ISAR)回波信号模型和目标高速运动对ISAR信号处理的影响。结果表明,目标高速运动会导致目标一维距离像的畸变和二维像的模糊。从通过补偿回波信号的调频斜率来补偿高速运动目标距离像的思路出发,提出了一种基于解线调处理的高速运动目标ISAR距离像补偿算法。该算法采用解线调处理谱包络最小Shannon熵准则进行参数估计,可解决在常规的幅度最大准则下参数估计性能恶化的问题。此外,距离像补偿算法中还用突变误差消除和最小二乘拟合处理以进一步提高参数估计精度。仿真结果表明该距离像补偿算法的有效性。
The inverse synthetic aperture radar (ISAR) echo signal model of fast-moving target and the effect of target fast-moving on ISAR signal processing were analyzed.The analysis results show that the fast-moving character results in ISAR range profile aberration and two-dimensional image blurring.Based on the idea of range profile compensation by eliminating the chirp rate of echo signal,an effective range profile compensation algorithm using the dechirp method was presented.In the algorithm,the spectrum envelope entropy minimizing criterion was applied to estimate the chirp rate to overcome the parameter estimation difficulty under the amplitude maximum criterion.Moreover,the burst error elimination and curve fitting process were used to improve the estimation accuracy of chirp rate in this algorithm.The computer simulation was presented to illustrate its effectiveness.
出处
《宇航学报》
EI
CAS
CSCD
北大核心
2004年第5期541-545,共5页
Journal of Astronautics
基金
国家"863计划"资助课题(No.2002AA731142)
