Analysis and Optimization of Anti-jamming Performance of User Terminals with Low Sidelobe Levels for LEO Satellite Systems

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Abstract
With the rapid development of Low Earth orbit (LEO) satellite systems, the scarcity of space spectrum resources and the intensification of inter-system interference have become prominent issues, directly affecting the performance and reliability of satellite systems. Therefore, the importance of mitigating interference in satellite communication has been increasingly emphasized in the field of configuration design of satellite systems. This paper investigates the performance optimization of anti-jamming user terminals in LEO satellite systems and provides in-depth analysis of the relationship between sidelobe level (SLL) and received Carrier-to-Aggregate-Interference-Ratio (CAIR). Furthermore, the anti-jamming capability of user terminals was further improved by adaptively adjusting the SLL based on analysis results. The anti-jamming user terminal utilizes patch antennas as array elements to form a 32×32 uniform rectangular array (URA), and optimizes the array radiation pattern’s SLL using Taylor amplitude weighting algorithm, achieving a minimum SLL of -60dB. The spatial state formed by the trajectories of large-scale LEO satellites is modeled using a Monte Carlo method based on stochastic geometry. It has practical implications for the design and performance improvement of user terminals in LEO constellation systems and provides valuable references for future research and design of similar systems.
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  • Chinese Academy of Sciences

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