A new way is proposed to evaluate the influence of atmospheric turbulence on image resolution of airborne and space-borne optical remote sensing system, which is called as arrival angle-method. Applying this method, s...A new way is proposed to evaluate the influence of atmospheric turbulence on image resolution of airborne and space-borne optical remote sensing system, which is called as arrival angle-method. Applying this method, some engineering examples are selected to analyze the turbulence influences on image resolution based on three different atmospheric turbulence models quantificationally, for the airborne remote sensing system, the resolution errors caused by the atmospheric turbulence are less than 1 cm, and for the space-borne remote sensing system, the errors are around 1 cm. The results are similar to that obtained by the previous Friedmethod. Compared with the Fried-method, the arrival angle-method is rather simple and can be easily used in engineering fields.展开更多
The coherence length of a laser diode (LD) beam can be reduced by modulating the source with a high frequency signal, which is superposed on the driving current for the LD. Experiments are made with a 980nm laser diod...The coherence length of a laser diode (LD) beam can be reduced by modulating the source with a high frequency signal, which is superposed on the driving current for the LD. Experiments are made with a 980nm laser diode. It is shown that the side peaks in coherence function can be reduced several times, but it is hard to suppress them completely .展开更多
文摘A new way is proposed to evaluate the influence of atmospheric turbulence on image resolution of airborne and space-borne optical remote sensing system, which is called as arrival angle-method. Applying this method, some engineering examples are selected to analyze the turbulence influences on image resolution based on three different atmospheric turbulence models quantificationally, for the airborne remote sensing system, the resolution errors caused by the atmospheric turbulence are less than 1 cm, and for the space-borne remote sensing system, the errors are around 1 cm. The results are similar to that obtained by the previous Friedmethod. Compared with the Fried-method, the arrival angle-method is rather simple and can be easily used in engineering fields.
文摘The coherence length of a laser diode (LD) beam can be reduced by modulating the source with a high frequency signal, which is superposed on the driving current for the LD. Experiments are made with a 980nm laser diode. It is shown that the side peaks in coherence function can be reduced several times, but it is hard to suppress them completely .
