本书介绍雷达对抗原理，包括雷达对抗概述、雷达信号频率的测量、雷达的方向测量和定位、雷达侦察的信号处理、雷达侦察作用距离与截获概率、遮盖性干扰、欺骗性干扰、干扰机组成及干扰能量的计算以及对雷达的无源对抗技术-The book introduced the principle of radar confrontation, including an overview of radar confrontation, radar signal frequency measurement, the dir

双馈电机变速恒频发电原理 通过对风力机转速的控制，可以实现最大功率点跟踪，尽量多地吸收风能；而调节无功功率可以控制向电网输出的功率因数，也可提高风电机组及电网系统的动、静态运行稳定性-VSCF doubly-fed electrical power through the principle of wind turbine speed control, maximum power point tracking can be achieved as much as possible to a

变速恒频机组可以根据风速调整发电机转速以获得更大的风能-Variable speed constant frequency wind turbines can get the maximum power by adjusting the rotor speed