Study on simultaneous microwave power transmission to multiple directions on solar power Station/satellite

太阳能卫星是一种清洁、取之不尽、用之不竭的能源，是解决能源危机的有希望的方法之一。微波能量传输是SPS的关键技术之一。反向定向阵列用于将功率波束定向到整流天线站点（功率接收站点）。从接收端发送导频信号，并对该信号进行扩频调制。该方法对噪声具有较强的鲁棒性，能够区分干扰信号，并能处理多导频信号，为太阳能卫星研制了一种采用SS导频信号的微波功率传输系统。通过带消除滤波器和软件同步检测，电力发射机和导频信号接收机共享天线和一个频段。评估了导频信号两通道间相位差检测的基本特性。利用8元阵列天线进行了实验，在相同天线发射功率下成功地探测到了到达方向。SS导频信号系统为2.45 GHz，应用于5.8 GHz的SPORTS（空间电力无线电传输系统）。采用遗传算法对均匀激励天线阵的单波束和多波束形成进行了优化

Solar Power Satellite is a clean and inexhaustible energy source and one of promising methods to save the energy crisis. Microwave energy transmission is one of key technologies of the SPS. The retrodirective array is used in order to direct a power beam to a rectenna site (power receiving site). A pilot signal is sent from the receiving cite and we apply the spread spectrum (SS) modulation to this signal. This method is robust to noises, can differentiate the signal from interferences and cope with multiple pilot signalsA new microwave power transmission system using a SS pilot signal is developed for the SPS (Solar Power Satellite). The antennas and a frequency band are shared by both power transmitters and pilot signal receivers by band elimination filters and software synchronization detection. Fundamental characteristics of phase-difference detection between two channels of a pilot signal are evaluated. An experiment with an 8-element array antenna was performed and the direction of arrival was successfully detected under transmitting power from the same antennas. The SS pilot signal system was made for 2.45 GHz and applied to 5.8 GHz SPORTS (Space Power Radio Transmission System). Single- and multi-beam forming for uniformly excited antenna array is optimized using the genetic algorithm