This paper introduces the assimilation technology in an ocean dynamics model and discusses the feasibility of inverting the sea surface current in the detection zone by assimilating the sea current radial velocity det...This paper introduces the assimilation technology in an ocean dynamics model and discusses the feasibility of inverting the sea surface current in the detection zone by assimilating the sea current radial velocity detected by single station HF ground wave radar in ocean dynamics model. Based on the adjoint assimilation and POM model, the paper successfully inverts the sea surface current through single station HF ground wave radar in the Zhoushan sea area. The single station HF radar inversion results are also compared with the bistatic HF radar composite results and the fixed point measured results by Annderaa current meter. The error analysis shows that acquisition of flow velocity and flow direction data from the single station HF radar based on adjoint assimilation and POM model is viable and the data obtained have a high correlation and consistency with the flow field observed by HF radar.展开更多
介绍了一种基于正交频分复用(orthogonal frequency division multiplexing,OFDM)技术的宽带短波数据调制解调器的设计方案。为了消除短波信道的多径衰落现象,将OFDM、带内频率分集和Turbb乘积码用于调制解调器的设计中。在共信道干扰...介绍了一种基于正交频分复用(orthogonal frequency division multiplexing,OFDM)技术的宽带短波数据调制解调器的设计方案。为了消除短波信道的多径衰落现象,将OFDM、带内频率分集和Turbb乘积码用于调制解调器的设计中。在共信道干扰被抑制的前提下,这种数据调制解调器可在带宽为125kHz的短波信道上实现8KB/s、16KB/s和32KB/s的数据传输。对这种宽带调制解调器在典型短波信道中的性能给出了数值仿真结果。展开更多
基金supported by the National High Technology Research and Development Program of China (863 Program, No. 2002AA639480)the National Natural Science Foundation of China (No. 41067003)
文摘This paper introduces the assimilation technology in an ocean dynamics model and discusses the feasibility of inverting the sea surface current in the detection zone by assimilating the sea current radial velocity detected by single station HF ground wave radar in ocean dynamics model. Based on the adjoint assimilation and POM model, the paper successfully inverts the sea surface current through single station HF ground wave radar in the Zhoushan sea area. The single station HF radar inversion results are also compared with the bistatic HF radar composite results and the fixed point measured results by Annderaa current meter. The error analysis shows that acquisition of flow velocity and flow direction data from the single station HF radar based on adjoint assimilation and POM model is viable and the data obtained have a high correlation and consistency with the flow field observed by HF radar.
文摘介绍了一种基于正交频分复用(orthogonal frequency division multiplexing,OFDM)技术的宽带短波数据调制解调器的设计方案。为了消除短波信道的多径衰落现象,将OFDM、带内频率分集和Turbb乘积码用于调制解调器的设计中。在共信道干扰被抑制的前提下,这种数据调制解调器可在带宽为125kHz的短波信道上实现8KB/s、16KB/s和32KB/s的数据传输。对这种宽带调制解调器在典型短波信道中的性能给出了数值仿真结果。
