Based on the flow characteristic equation of air in adiabatic process, the characteristics of modulated on-off valve in a pneumatic pressure control system is analyzed theoretically. The relationship between the param...Based on the flow characteristic equation of air in adiabatic process, the characteristics of modulated on-off valve in a pneumatic pressure control system is analyzed theoretically. The relationship between the parameters and performance of the system is obtained, and it is also observed that the control error is proportional to the on-off period of the valve.展开更多
在分析遥测接收系统工作原理的基础上,深入研究了CORDIC(COordinate Rotation Digital Computer)算法的解调技术.当输入为正交中频(IF)信号和对应的时钟信息时,输出即为输入瞬时信号对应的瞬时相位,但在信道没有延迟时,其抗噪性能不如...在分析遥测接收系统工作原理的基础上,深入研究了CORDIC(COordinate Rotation Digital Computer)算法的解调技术.当输入为正交中频(IF)信号和对应的时钟信息时,输出即为输入瞬时信号对应的瞬时相位,但在信道没有延迟时,其抗噪性能不如相干解调.在此基础上设计了一种改进的CORDIC差分鉴频解调算法,得到瞬时相位后,在数字域作1阶差分完成信号鉴频,保证了在信道没有延迟的情况下信号的抗噪性能.通过仿真实验证明了算法的合理性.展开更多
文摘Based on the flow characteristic equation of air in adiabatic process, the characteristics of modulated on-off valve in a pneumatic pressure control system is analyzed theoretically. The relationship between the parameters and performance of the system is obtained, and it is also observed that the control error is proportional to the on-off period of the valve.
文摘在分析遥测接收系统工作原理的基础上,深入研究了CORDIC(COordinate Rotation Digital Computer)算法的解调技术.当输入为正交中频(IF)信号和对应的时钟信息时,输出即为输入瞬时信号对应的瞬时相位,但在信道没有延迟时,其抗噪性能不如相干解调.在此基础上设计了一种改进的CORDIC差分鉴频解调算法,得到瞬时相位后,在数字域作1阶差分完成信号鉴频,保证了在信道没有延迟的情况下信号的抗噪性能.通过仿真实验证明了算法的合理性.
