With the rapid development of laser technology, the potential risk of on orbit satellites being attacked by laser becomes more and more prominent. According to the types of exposed parts of the satellite, the degree of damage and the impact on the satellite function, the vulnerability analysis of the satellite system to laser irradiation was carried out. The results show that the satellite solar array, thermal control components, star sensors and communication antennas are vulnerable to laser attack, and have different degrees of impact on the long-term or short-term operation status of the satellite. Based on the general function module and information logic of the satellite, the satellite laser irradiation threat assessment software is constructed, and the quantitative assessment results of the damage of different components affecting the satellite status under typical space conditions are obtained through settlement, so as to carry out risk assessment and provide reference for formulating defense strategies.
Triple-junction GaAs solar cells were irradiated by nanosecond pulse laser with a wavelength of 1064nm, in atmospheric and vacuum environments respectively to study the damage characteristics of triple-junction GaAs solar cells irradiated nanosecond pulse laser in different environments, and the damage effects of pulse laser in two environments were compared and analyzed. The experimental results show that the damage of solar cells irradiated by nanosecond pulse laser is significantly affected by the target energy density, and the damage effect is positively correlated with the number of pulses, which increases with the number of pulses. Due to the high peak power, short action time, no obvious thermal effect of the action process, and no material migration phenomenon, the damage effect of solar cells is similar under pulsed laser irradiation with the same parameters in different environments.
The laser irradiation effect of three-junction GaAs solar cell arrays was studied through the experiment of fiber laser irradiation under different irradiation time and power density. The photocurrent voltage characteristics of solar array before and after laser irradiation were tested, The dark current voltage characteristics and spectral response of each solar cell array after irradiation were tested. The test and analysis results reveal that, The radiation damage of continuous laser to the array, due to the uneven energy distribution of the laser spot, the damage degree at different positions of the array is different. The damage of a single battery varies greatly, ranging from slight damage to complete failure. In the area with medium or strong laser power, continuous laser first damages the first and second junctions corresponding to the top cell and the middle cell, while the third junction corresponding to the bottom cell has less influence; In the area with weak laser power, the damage to the battery interior caused by continuous laser starts from the bottom battery with the smallest band gap, followed by the top battery and the middle battery.
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