BeiDou laser satellite replacement plan boosts navigation network efficiency
Researchers optimize satellite swap sequence using laser inter-satellite links for BeiDou.
The BeiDou Navigation Satellite System's third generation (BDS-3) is approaching a critical juncture as its earliest satellites reach the end of their design lifetime. To address this, researchers have proposed a progressive constellation replacement strategy that upgrades legacy microwave satellites with new laser-enabled ones. The key innovation is network-aware launch sequence planning—using integer linear programming (ILP) and a priority-aware search heuristic to evaluate each action's networking gain under engineering constraints.
Simulations based on the actual BDS-3 constellation showed that the proposed sequence outperforms the historical launch order in multiple ways: earlier formation of a ground-accessible laser-enhanced network structure, better utilization of laser-link resources, fewer residual non-anchor satellites, and lower microwave-layer waiting delay. The framework serves as a decision-support tool for BeiDou's evolution and provides direct engineering guidance for replacement planning, potentially improving global navigation accuracy and reliability.
- BDS-3's early satellites are nearing end of life, requiring progressive replacement with laser-enhanced satellites.
- Laser inter-satellite links (LISLs) enable sub-millimeter ranging and high-precision time transfer for better accuracy.
- The proposed ILP and heuristic-based sequence reduces microwave-layer waiting delay and improves laser network utilization.
Why It Matters
Optimizing satellite swaps with laser links boosts BeiDou's accuracy and reliability for critical global users.