跟瞄精度是空间激光通信系统捕获、跟踪和瞄准(acquisition,tracking and pointing,ATP)分系统的重要指标参数之一,其准确测量是评估空间激光通信系统远距离通信性能的关键。介绍了空间激光通信系统ATP分系统跟瞄精度的测试方法,设计了...跟瞄精度是空间激光通信系统捕获、跟踪和瞄准(acquisition,tracking and pointing,ATP)分系统的重要指标参数之一,其准确测量是评估空间激光通信系统远距离通信性能的关键。介绍了空间激光通信系统ATP分系统跟瞄精度的测试方法,设计了一种基于平行光管法的空间激光通信系统动态瞄参数测量装置,分析和讨论了影响动态跟瞄精度测量不确定度的因素。试验表明,该测量装置在100Hz振动频率条件下,ATP分系统稳定精度测量不确定度达到1.9μrad(k=2),可用于空间激光通信系统ATP分系统跟瞄参数检测以及远距离激光通信性能评估。展开更多
We propose a new method for the development of multi-beam systems for the spatial alignment and stability of beams based on the error separation technique.This method avoids alignment errors caused by coupling effect ...We propose a new method for the development of multi-beam systems for the spatial alignment and stability of beams based on the error separation technique.This method avoids alignment errors caused by coupling effect of piezoelectric devices,inaccurate correction calculations,and detection mode of the angular deviation.According to the results by external detectors,the error value of spatial alignment and the root mean square[RMS]of deviations under control during 1 h can be equivalent to approximately 0.87 and 1.06 nm at the sample plane under an oil immersion lens[focal length f=2 mm].The RMS of deviations is less than one-third of those currently reported for multi-beam systems;therefore,higher alignment and stability accuracy can be achieved with our proposed method.展开更多
Energy optimization is one of the key problems for ship roll reduction systems in the last decade. According to the nonlinear characteristics of ship motion, the four degrees of freedom nonlinear model of Fin/Rudder r...Energy optimization is one of the key problems for ship roll reduction systems in the last decade. According to the nonlinear characteristics of ship motion, the four degrees of freedom nonlinear model of Fin/Rudder roll stabilization can be established. This paper analyzes energy consumption caused by overcoming the resistance and the yaw, which is added to the fin/rudder roll stabilization system as new performance index. In order to achieve the purpose of the roll reduction, ship course keeping and energy optimization, the self-tuning PID controller based on the multi-objective genetic algorithm （MOGA） method is used to optimize performance index. In addition, random weight coefficient is adopted to build a multi-objective genetic algorithm optimization model. The objective function is improved so that the objective function can be normalized to a constant level. Simulation results showed that the control method based on MOGA, compared with the traditional control method, not only improves the efficiency of roll stabilization and yaw control precision, but also optimizes the energy of the system. The proposed methodology can get a better performance at different sea states.展开更多
文摘跟瞄精度是空间激光通信系统捕获、跟踪和瞄准(acquisition,tracking and pointing,ATP)分系统的重要指标参数之一,其准确测量是评估空间激光通信系统远距离通信性能的关键。介绍了空间激光通信系统ATP分系统跟瞄精度的测试方法,设计了一种基于平行光管法的空间激光通信系统动态瞄参数测量装置,分析和讨论了影响动态跟瞄精度测量不确定度的因素。试验表明,该测量装置在100Hz振动频率条件下,ATP分系统稳定精度测量不确定度达到1.9μrad(k=2),可用于空间激光通信系统ATP分系统跟瞄参数检测以及远距离激光通信性能评估。
基金supported by the National Key R&D Program of China(No.2021YFF0502700)National Natural Science Foundation of China(Nos.52105565 and 62105298)+3 种基金Natural Science Foundation of Zhejiang Province(Nos.LQ22F050015 and LQ22F050017)Major Program of Natural Science Foundation of Zhejiang Province(No.LD21F050002)Postdoctoral Research Foundation of China(No.2020M671822)Major Scientific Project of Zhejiang Lab(No.2020MC0AE01)。
文摘We propose a new method for the development of multi-beam systems for the spatial alignment and stability of beams based on the error separation technique.This method avoids alignment errors caused by coupling effect of piezoelectric devices,inaccurate correction calculations,and detection mode of the angular deviation.According to the results by external detectors,the error value of spatial alignment and the root mean square[RMS]of deviations under control during 1 h can be equivalent to approximately 0.87 and 1.06 nm at the sample plane under an oil immersion lens[focal length f=2 mm].The RMS of deviations is less than one-third of those currently reported for multi-beam systems;therefore,higher alignment and stability accuracy can be achieved with our proposed method.
基金Foundation item： Supported by the National Natural Science Foundation of China （Grant No. 61174047） and the Fundamental Research Funds for the Central Universities （HEUCF041406）.
文摘Energy optimization is one of the key problems for ship roll reduction systems in the last decade. According to the nonlinear characteristics of ship motion, the four degrees of freedom nonlinear model of Fin/Rudder roll stabilization can be established. This paper analyzes energy consumption caused by overcoming the resistance and the yaw, which is added to the fin/rudder roll stabilization system as new performance index. In order to achieve the purpose of the roll reduction, ship course keeping and energy optimization, the self-tuning PID controller based on the multi-objective genetic algorithm （MOGA） method is used to optimize performance index. In addition, random weight coefficient is adopted to build a multi-objective genetic algorithm optimization model. The objective function is improved so that the objective function can be normalized to a constant level. Simulation results showed that the control method based on MOGA, compared with the traditional control method, not only improves the efficiency of roll stabilization and yaw control precision, but also optimizes the energy of the system. The proposed methodology can get a better performance at different sea states.
