High-fidelity Cowell orbital propagator and Walker-Delta LEO constellation simulator in PHP 8. Integrates RK4 numerical physics ($J_2$, atmospheric drag, SRP), optical inter-satellite link (ISL) Doppler profiling, Dijkstra multi-hop mesh routing, and real-time CesiumJS 3D CZML/SSE visualization.
astrodynamics server-sent-events gnss cesiumjs dijkstra-algorithm orbital-mechanics runge-kutta space-situational-awareness php8 satellite-constellation doppler-shift inter-satellite-links space-mission-design walker-delta optical-isl cowell-method
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Updated
Oct 23, 2026 - PHP