Link Budget Calculator
Analyze RF communication link margins for spacecraft-to-ground and inter-satellite links. Accounts for path loss, antenna gains, atmospheric effects, and noise.
What It Does
The Link Budget Calculator performs end-to-end RF link analysis for spacecraft communication systems. Configure transmitter power, antenna gains, frequency, range, and atmospheric conditions to compute received signal power, noise floor, carrier-to-noise ratio, and link margin. Supports uplink, downlink, and crosslink configurations.
Key Features
- Complete link equation with free-space path loss and atmospheric attenuation
- Antenna gain patterns for common types (parabolic, patch, helix, phased array)
- Rain fade and atmospheric absorption models for Ka, Ku, X, S, and L bands
- Data rate vs margin trade-off visualization
Why It Matters
Communication link margin determines whether your spacecraft can close the link with its ground station. A 3 dB error in your link budget can mean the difference between a working mission and a silent spacecraft. The link budget is one of the first analyses run during mission concept development and is revisited at every design review through CDR.
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Included in every plan
All 50+ engineering calculators are available on every SMAD Portal plan, starting at $29/month. No add-ons, no per-calculator fees.