Code delay and Doppler shifted frequency could not be captured by using the conventional GPS receiver in strong interference environments because the received GPS signals which traveled a long distance are very weak. ...Code delay and Doppler shifted frequency could not be captured by using the conventional GPS receiver in strong interference environments because the received GPS signals which traveled a long distance are very weak. An anti-jamming GPS receiver is proposed. The interferences in the received signals are can- celled by using subspace projecting technique, and the resulting interference-free signals are processed by a weight vector which maximizes the signal-to-noise ratio. Simulation is conducted, and the results show that the method is valid.展开更多
To estimate the direction-of-arrival （DOA） of wideband coherent signals, a new method by modifying the orthogonality of the projected suhspaces method is proposed. And it can deal with randomly position perturbed ar...To estimate the direction-of-arrival （DOA） of wideband coherent signals, a new method by modifying the orthogonality of the projected suhspaces method is proposed. And it can deal with randomly position perturbed arrays by using the Toeplitz method. This method needn＇t the primary information of DOA for focusing matrix and the sector dividing of interpolated method, which improving the precision of estimation and reducing the computational complexity. Simulations illustrate the effectiveness of this method.展开更多
广播电视覆盖工程是指通过建设发射、传输、接收等设施,将广播电视信号送达目标区域的工程,对于提高广播电视覆盖率、促进信息传播具有重要意义。首先介绍广播电视覆盖工程的概念和发展历程,其次分析广播电视覆盖工程应用的技术,包括数...广播电视覆盖工程是指通过建设发射、传输、接收等设施,将广播电视信号送达目标区域的工程,对于提高广播电视覆盖率、促进信息传播具有重要意义。首先介绍广播电视覆盖工程的概念和发展历程,其次分析广播电视覆盖工程应用的技术,包括数字信号处理技术(Digital Signal Processing,DSP)、卫星传输技术及互联网协议电视(Internet Protocol Television,IPTV)技术等,最后介绍具体案例,希望为广播电视覆盖工程的技术应用提供借鉴。展开更多
基金supported by the National Natural Science Foundation of China (60472052 10577007)+1 种基金the Program for New Century Excellent Talents in University (2004)the National Key Lab Foundation of National Anti-Interference Communication Technology Laboratory
文摘Code delay and Doppler shifted frequency could not be captured by using the conventional GPS receiver in strong interference environments because the received GPS signals which traveled a long distance are very weak. An anti-jamming GPS receiver is proposed. The interferences in the received signals are can- celled by using subspace projecting technique, and the resulting interference-free signals are processed by a weight vector which maximizes the signal-to-noise ratio. Simulation is conducted, and the results show that the method is valid.
文摘To estimate the direction-of-arrival （DOA） of wideband coherent signals, a new method by modifying the orthogonality of the projected suhspaces method is proposed. And it can deal with randomly position perturbed arrays by using the Toeplitz method. This method needn＇t the primary information of DOA for focusing matrix and the sector dividing of interpolated method, which improving the precision of estimation and reducing the computational complexity. Simulations illustrate the effectiveness of this method.
文摘广播电视覆盖工程是指通过建设发射、传输、接收等设施,将广播电视信号送达目标区域的工程,对于提高广播电视覆盖率、促进信息传播具有重要意义。首先介绍广播电视覆盖工程的概念和发展历程,其次分析广播电视覆盖工程应用的技术,包括数字信号处理技术(Digital Signal Processing,DSP)、卫星传输技术及互联网协议电视(Internet Protocol Television,IPTV)技术等,最后介绍具体案例,希望为广播电视覆盖工程的技术应用提供借鉴。
