基于GKT-RT-GDP的长时间相参积累算法  

Long time coherent accumulation algorithm based on GKT-RT-GDP

作　　者：谢锡海 苏欣阳 张依旋 XIE Xihai;SU Xinyang;ZHANG Yixuan(School of Communication and Information Engineering,Xi'an University of Posts and Telecommunications,Xi'an 710121,China)

机构地区：[1]西安邮电大学通信与信息工程学院

出　　处：《西安邮电大学学报》2019年第3期12-18,24,共8页Journal of Xi’an University of Posts and Telecommunications

基　　金：陕西省自然科学基金资助项目(2018JQ6093)

摘　　要：提出一种基于广义Keystone变换(generalized Keystone transform,GKT)、拉东变换(Radon transform,RT)和广义去调频处理(generalized dechirp process,GDP)的长时间相参积累算法,应用于对雷达高度表回波信号的处理。使用GKT校正由径向加速度引起的距离弯曲,应用RT估计雷达高度表的速度并构造补偿函数校正距离走动,采用GDP方法估计雷达高度表的径向加速度并构造相位补偿函数校正多普勒频率徙动,最后使用快速傅里叶变换对算法处理后的回波信号做相参积累。仿真结果表明,GKT-RT-GDP算法能够实现对多普勒频率徙动和距离徙动的校正,并且与基于KT-GDP长时间相参积累算法相比,在运算复杂度增加较小的条件下,相参积累后的信噪比增加了5 dB,算法的校正效果较好。An algorithm based on a generalized Keystone transform(GKT),Radon transform(RT)and generalized dechirp process(GDP)long time coherent accumulation is proposed for the radar altimeter echo signal processing.GKT,RT and GDP method are used to correct the range curvature caused by radial acceleration,to estimate the speed of radar altimeter and construct compensation function to correct the range walk,and to estimate the radial acceleration of radar altimeter and construct phase compensation function to correct the doppler frequency migration respectively.Fast Fourier transform is then used to conduct phase-coherent accumulation of the echo signals processed by the algorithm.Simulation results show that the proposed GKT-RT-GDP algorithm can realize the correction of doppler frequency migration and distance migration,and the signal-to-noise ratio of the proposed algorithm after phase-coherent accumulation can be increased by 5 dB with little increase of the operational complexity compared with the long-term phase-coherent accumulation algorithm based on KT-GDP.The correction effect of this method is better.

关 键 词：雷达高度表 广义Keystone变换 拉东变换 广义去调频处理 相参积累 

分 类 号：TP312[自动化与计算机技术—计算机软件与理论]