Great changes occurred to the Japanese power structure as DPJ had taken power. The new government in Japan is now headed by DPJ and its alliance–Social Democratic Party and People's New Party, substituting for LD...Great changes occurred to the Japanese power structure as DPJ had taken power. The new government in Japan is now headed by DPJ and its alliance–Social Democratic Party and People's New Party, substituting for LDP-Komeito coalition government, an alternation of two conservative parties, though not in a strict sense of the two-party alternation. The election intensified the conservative politics in general, though different from the hawk conservative force in the post-cold war period. The Japanese political currents see a trend of 'de-rightwardization'. This will help to improve Japan’s relations with its Asian neighbors. Yukio Hatoyama calls for building 'fraternity society' and fostering 'fraternity' spirit in diplomatic affairs. He is for the view of attaching equal importance to U.S. and Asia.展开更多
Distributed precision jamming(DPJ)is a novel blanket jamming concept in electronic warfare,which delivers the jamming resource to the opponent equipment precisely and ensures that friendly devices are not affected.Rob...Distributed precision jamming(DPJ)is a novel blanket jamming concept in electronic warfare,which delivers the jamming resource to the opponent equipment precisely and ensures that friendly devices are not affected.Robust jamming performance and low hardware burden on the jammers are crucial for practical DPJ implementation.To achieve these goals,we study the robust design of wideband constant modulus(CM)discrete phase waveform for DPJ,where the worst-case combined power spectrum(CPS)of both the opponent and friendly devices is considered in the objective function,and the CM discrete phase constraints are used to design the wideband waveform.Specifically,the resultant mathematical model is a large-scale minimax multi-objective optimization problem(MOP)with CM and discrete phase constraints.To tackle the challenging MOP,we transform it into a single-objective minimization problem using the Lp-norm and Pareto framework.For the approximation problem,we propose the Riemannian conjugate gradient for CM discrete phase constraints(RCG-CMDPC)algorithm with low computational complexity,which leverages the complex circle manifold and a projection method to satisfy the CM discrete phase constraints within the RCG framework.Numerical examples demonstrate the superior robust DPJ effectiveness and computational efficiency compared to other competing algorithms.展开更多
文摘Great changes occurred to the Japanese power structure as DPJ had taken power. The new government in Japan is now headed by DPJ and its alliance–Social Democratic Party and People's New Party, substituting for LDP-Komeito coalition government, an alternation of two conservative parties, though not in a strict sense of the two-party alternation. The election intensified the conservative politics in general, though different from the hawk conservative force in the post-cold war period. The Japanese political currents see a trend of 'de-rightwardization'. This will help to improve Japan’s relations with its Asian neighbors. Yukio Hatoyama calls for building 'fraternity society' and fostering 'fraternity' spirit in diplomatic affairs. He is for the view of attaching equal importance to U.S. and Asia.
基金supported by the National Natural Science Foundation of China(No.62301581)the Postgraduate Scientific Research Innovation Project of Hunan Province,China(No.CX20230045)。
文摘Distributed precision jamming(DPJ)is a novel blanket jamming concept in electronic warfare,which delivers the jamming resource to the opponent equipment precisely and ensures that friendly devices are not affected.Robust jamming performance and low hardware burden on the jammers are crucial for practical DPJ implementation.To achieve these goals,we study the robust design of wideband constant modulus(CM)discrete phase waveform for DPJ,where the worst-case combined power spectrum(CPS)of both the opponent and friendly devices is considered in the objective function,and the CM discrete phase constraints are used to design the wideband waveform.Specifically,the resultant mathematical model is a large-scale minimax multi-objective optimization problem(MOP)with CM and discrete phase constraints.To tackle the challenging MOP,we transform it into a single-objective minimization problem using the Lp-norm and Pareto framework.For the approximation problem,we propose the Riemannian conjugate gradient for CM discrete phase constraints(RCG-CMDPC)algorithm with low computational complexity,which leverages the complex circle manifold and a projection method to satisfy the CM discrete phase constraints within the RCG framework.Numerical examples demonstrate the superior robust DPJ effectiveness and computational efficiency compared to other competing algorithms.
