一种改进的电离层层析成像算法

针对电离层层析成像算法中确定相位积分常数以及合理选择迭代初值等关键问题，本文提出一种联合使用差分多普勒相位和差分多普勒频率数据的新算法，将相位积分常数的计算以及迭代初值的确定与图像的重建过程统一起来．该算法克服了单独计算相位积分常数的困难，初值的选择也较为合理，数值模拟反演与对实测数据反演的结果证明，本文提出的算法对电离层ＣＴ重建更为合理有效．

AN IMPROVED RECONSTRUCTION ALGORITHM FOR COMPUTERIZED IONOSPHERIC TOMOGRAPHY

An improved reconstruction algorithm of computerized ionospherictomography is proposed in this paper. In this algorithm, both differential DopplerPhase data and differential Doppler frequency data are exploited to solve the crucialproblems of correctly calculating integral phase constant and appropriately choosinginitial guess for iteration which prevalently exist in the study of computerizedionospheric tomography. The calculating of integral phase constant and the choosingof initial guess are integrated in the process of reconstruction. The algorithm avoidscalculating phase constant separately before reconstruction, offering a more reasonablemethod to choose initial guess as well. Both numerical simulation example andreconstructed results from observed data show that the new algorithm works reasonablyand effectively with ionospheric CT problems.