Abstract
The beaconless acquisition tracking and pointing (ATP) technology use the signal beam to establish the laser communication link, which can decrease the total weight and power consumption of laser communication terminal (LCT). In this paper, we mainly present the error range correction process and the calculation of acquisition time, the link budget is also calculated. Beaconless ATP technology is used in Low Earth Orbit(LEO), the transmit power is 0.5w, and the maximum communication distance is 4000km. Uncertain area results from the radom and fixed factors is analyzed, and is decreased from 2.5mrad to 865μrad through correction. The correct time of the uncertain area is less than 0.5 hour. The scanning strategy, considered with the vibration of the satellite platform, is proposed, the overlap factor is selected as 0.47 for complete coverage, and thus the acquisition time is less than 51s with a probability of 98%, which can meet the use of LEO laser communication.
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