Receive-Chain Linearity for Next-Gen Earth Observation Ground Stations

As Earth Observation (EO) satellites push the limits with higher data rates and tighter signal fidelity requirements, the linearity of ground-based receive chains has emerged as a critical – yet often overlooked – performance factor.

In Low Earth Orbit (LEO) satellite communications, fast-changing signal power levels (driven by satellite motion and atmospheric effects) can strain even well-engineered ground stations. Nonlinearities in RF front-end components—including low-noise amplifiers (LNAs), mixers, and downconverters—can significantly degrade signal quality, leading to higher bit error rates (BER) and reduced mission efficiency.

Our latest research dives deep into these challenges, focusing on:

• How signal power variation across LEO passes impacts performance
• The role of RF linearity parameters such as P1dB, OIP3, and IMD
• How thermal behaviour affects low-noise block (LNB) stability
• A full X-band receiver chain analysis using simulations and lab measurement data with a LNB

The findings underscore a clear message: front-end design margin and linearity-aware system architectures are essential for next-generation EO ground stations.

If you would like a copy of the full technical paper please contact us.