Analysis of Beam Misalignment Effect in Inter-Satellite FSO Links
🤖 AI Summary
Beam misalignment severely degrades link performance in inter-satellite free-space optical (FSO) communication.
Method: This paper proposes a channel modeling framework that balances physical interpretability and computational efficiency. Departing from conventional pointing-ahead-angle (PAA) compensation schemes—which rely on high-precision orbital priors and complex hardware—we integrate orbital dynamics modeling with statistical error analysis to characterize combined jitter and misalignment effects.
Contribution/Results: We derive, for the first time, a closed-form expression for the cumulative distribution function (CDF) of the channel gain under joint jitter and misalignment. Based on this, we design an efficient outage probability computation algorithm leveraging truncated CDF inversion and binary search—guaranteeing convergence while substantially reducing computational overhead. Numerical simulations show excellent agreement with Monte Carlo results, validating the model’s effectiveness and practicality for inter-satellite link design and performance evaluation.
Application Category
📝 Abstract
Free-space optical (FSO) communication has emerged as a promising technology for inter-satellite links (ISLs) due to its high data rate, low power consumption, and reduced interference. However, the performance of inter-satellite FSO systems is highly sensitive to beam misalignment. While pointing-ahead angle (PAA) compensation is commonly employed, the effectiveness of PAA compensation depends on precise orbital knowledge and advanced alignment hardware, which are not always feasible in practice. To address this challenge, this paper investigates the impact of beam misalignment on inter-satellite FSO communication. We derive a closed-form expression for the cumulative distribution function (CDF) of the FSO channel under the joint jitter and misalignment-induced pointing error, and introduce a truncated CDF formulation with a bisection algorithm to efficiently compute outage probabilities with guaranteed convergence and minimal computational overhead. To make the analysis more practical, we quantify displacement based on orbital dynamics. Numerical results demonstrate that the proposed model closely matches Monte Carlo simulations, making the proposed model highly useful to design inter-satellite FSO systems in practice.
Problem
Research questions and friction points this paper is trying to address.
Analyzing beam misalignment effects in satellite FSO links
Quantifying displacement based on orbital dynamics
Computing outage probabilities with guaranteed convergence
Innovation
Methods, ideas, or system contributions that make the work stand out.
Derived closed-form CDF for misalignment errors
Introduced truncated CDF with bisection algorithm
Quantified displacement using orbital dynamics
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