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Comparative analysis of different iterative model for exoatmospheric autonomous iterative guidance method

Journal of Harbin Institute of Technology(New Series) 2012年第4期19卷 71-76页

作者：傅瑜陆宝钢崔乃刚 School of Astronautics Harbin Institute of Technology

Space applications have raised the demand on autonomy, security and reliability for current transportation vehicle, which require guidance technology of vehicle must have strong robustness and adaptability. Therefore, it is needed to research exoatmospheric autonomous iterative guidance method with stronger adaptivity and higher accuracy. Based on preliminary research results, two new iterative models with performance index of maximum terminal energy for exoatmospheric autonomous iterative guidance method are proposed in this paper. Then comparative analysis between preliminary research iterative model and two new iterative models proposed is performed. The results demonstrate that the inner update iterative model proposed is the least sensitive to initial values and have the best convergence and performance in the three iterative models.

关键词： iterative guidance iterative model optimal trajectory analytical solution

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Analysis of High-Frequency EM Scattering Properties on Time-Varying Sea Surface

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Chinese Journal of Electronics 2016年第2期25卷 384-390页

作者： LI Changze TONG Chuangming QI Lihui WANG Tong ZHAO Haizhou Air and Missile Defense College Air Force Engineering University Military Representative Office of PLA in 786 Factory

This paper proposes to solve the extralarge scale Electromagnetic(EM) scattering problem on a wind-driven sea surface at Low-grazing-angle(LGA) directed against a shore-based radar with an iterative physical optics(IPO) model. Using Monte Carlo simulations,it compares the average Doppler spectra of backscattered signals at different angles and sea states. The methods are: the forward-backward methodology and its modification with under-relaxation iteration which improves convergence and stability of the IPO; the local iteration methodology and the Fast far-field approximation(Fa FFA)in the matrix-vector product which reduce the computational complexity based on the scattering characteristics of sea surface. The simulations show a broadening effect of the Doppler spectra in a more complicated sea state at LGA.

关键词： Shore-based radar Doppler spectra LGA iterative model Forward-backward methodology

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