Satellite Shell Design and Performance Analysis: A Walker-Delta Constellation Study

What is a Satellite Shell?

A satellite shell in low-Earth orbit (LEO) refers to a network of satellites arranged in specific orbital planes designed to provide global coverage. The Walker-delta constellation, for instance, involves a series of planes with satellites evenly distributed across them.

Each plane has a specific altitude and inclination angle relative to the Earth's equator, ensuring optimal coverage and minimizing gaps in service.

Key Parameters: Keplerian Elements vs. Numerical Integration

The design of a satellite shell requires precise calculations for orbital parameters such as altitude, inclination, and period. The Keplerian elements provide an analytical approach to these orbits using Kepler's laws of planetary motion.

However, numerical integration methods like Runge-Kutta 4 (RK4) offer more accurate predictions by solving the equations of motion numerically, accounting for perturbations and non-ideal conditions.

Elevation Mask and Satellite Handovers

The elevation mask is a critical parameter in satellite design that defines the minimum angle above the horizon at which a satellite must be visible to provide reliable service. This ensures that satellites are not obscured by terrain or atmospheric conditions.

Satellite handovers occur when a user transitions from one satellite's coverage area to another as the satellites move across the sky, requiring seamless communication between them.

Doppler Effect and Laser-Link Latency

The Doppler effect plays a crucial role in satellite communications, affecting the frequency of signals received due to relative motion between the satellite and the ground station. This can impact data transmission rates and require adjustments in communication protocols.

Laser links offer faster data transfer rates compared to traditional radio frequencies but introduce additional latency due to the speed of light and atmospheric conditions.

Frequently asked questions

Try it live

Everything above runs in your browser — open Satellite Shell vs Fibre: Walker-Delta LEO Coverage, Elevation Mask, Doppler and Laser-Link Latency Lab and change the parameters while it is running. Nothing is installed, nothing is uploaded, the whole model lives in one tab.