An experimental study on new crystal used in repetition frequency laser device of laser terminal guidance system

2020 ◽  
Author(s):  
Gang Li ◽  
Yu-dan Chen ◽  
Fuyu Huang ◽  
Bing Zhou ◽  
Dongsheng Wu ◽  
...  
Keyword(s):  
Experimental Study ◽  
Repetition Frequency ◽  
Guidance System ◽  
Laser Device ◽  
Frequency Laser ◽  
Terminal Guidance

Experimental Study of the Dual-Frequency Laser Based on the Nd∶YVO4/Nd∶GdVO4 Combined Crystal

2018 ◽  
Vol 55 (9) ◽  
pp. 091407
Author(s):  
金涛 Jin Tao ◽  
胡淼 Hu Miao ◽  
李鹏 Li Peng ◽  
范红丹 Fan Hongdan ◽  
韩宁 Han Ning ◽  
...  
Keyword(s):  
Experimental Study ◽  
Dual Frequency ◽  
Frequency Laser

scholarly journals Analysis of the Influence of Trace Point Step-Jump Behavior

2020 ◽  
Vol 2020 ◽  
pp. 1-14
Author(s):  
Yao Yang ◽  
Yang Xu ◽  
Pei Wang
Keyword(s):  
Recovery Time ◽  
Sliding Mode ◽  
Initial Step ◽  
Guidance System ◽  
Adjoint Model ◽  
Proportional Navigation ◽  
Guidance Law ◽  
Optimal Guidance ◽  
Fundamental Reason ◽  
Terminal Guidance

To explore the influence of the trace point step-jump behavior on a terminal guidance system, an analysis is performed from the line-of-sight rate (LOS rate) and guidance accuracy views for designing an anti-step-jump guidance law. First, the linear terminal guidance model under the trace point jump circumstance is constructed, and then the fundamental reason for the miss distance is investigated by deriving the upper bound of the LOS rate at the initial step-jump moment. Following this, the novel proposed analytical differential adjoint model is established with the adjoint method, and its validity is demonstrated comparing with the numeric derivative model. Based on the adjoint model, the effects of the ratio coefficient, the time constant, and the jump amplitude on the guidance accuracy are explored. Finally, a novel anti-step-jump guidance law is designed to shorten the recovery time of the overload. The simulations have shown that the faster recovery time and higher accuracy are achieved in comparison with the proportional navigation guidance, optimal guidance, and adaptive sliding mode guidance.

Experiment Study of Coupling Effect among the Rotary Axes in Simulator

2014 ◽  
Vol 614 ◽  
pp. 304-307
Author(s):  
Guang Hua Li ◽  
Jin Zeng Chen ◽  
Man Lin Long
Keyword(s):  
Experimental Study ◽  
Mathematical Models ◽  
Coupling Effect ◽  
Guidance System ◽  
Experiment Study ◽  
Rotary Axes ◽  
Aerospace Technology

Development of aerospace technology is inseparable from the excellent performances of guidance system. It often tests performances of guidance system on simulator in engineering. It can be drawn that coupling effect among the rotary axes in simulator is present by analyzing mathematical models of simulator. Currently, experimental study carried out for the conclusion about coupling effect among the rotary axes is a few. Therefore, experimental study about coupling effect among the axes at the time of simulator linkage is carried out to determine the existence of such a coupling effect and observe its impact.

Experimental Study on High Efficiency Double Frequency Laser with LD Dual Pump Nd∶YAG

2018 ◽  
Vol 39 (6) ◽  
pp. 830-837
Author(s):  
范嗣强 FAN Si-qiang ◽  
李麒麟 LI Qi-lin ◽  
路永乐 LU Yong-le
Keyword(s):  
Experimental Study ◽  
High Efficiency ◽  
Double Frequency ◽  
Frequency Laser
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