Satellite Spectrum Reversal for LEO-GEO Interference Avoidance

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Solution Overview

Problem

Current low earth orbit (LEO) and geosynchronous earth orbit (GEO) satellite systems face interference issues due to operating in the same frequency bands, leading to constraints on aperture and reliability, especially in hilly or forested areas.

Innovation Solution

The solution involves reversing the spectrum configuration for LEO satellite systems, allowing them to operate on the same frequencies as GEO systems without interference, by using higher millimeter wave frequencies to create narrow pencil-beams and forming nulls to reduce interference.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If LEO and GEO satellite systems operate in the same frequency bands, then spectrum utilization is improved, but co-channel interference occurs between the two systems

Engineering Contradiction:

Improvespectrum utilizationVSAvoidco-channel interference

Core Design Contradiction:

Adaptability or versatilityVSObject-affected harmful factors

Solution Approach 1:

The patent segments the frequency spectrum by assigning different frequency bands to LEO and GEO satellite systems. LEO satellites operate in lower frequency bands while GEO satellites operate in higher frequency bands, thereby eliminating co-channel interference while maintaining spectrum utilization. This frequency segmentation allows both systems to coexist without mutual interference.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent applies local quality by optimizing antenna characteristics and beamforming parameters specifically for each satellite system's frequency band. LEO satellites use antennas and beamforming configurations optimized for lower frequencies and lower orbital altitude, while GEO satellites use configurations optimized for higher frequencies and geosynchronous orbit, thereby minimizing interference in their respective operational environments.

Inventive Principle:

Principle #3Local quality

2Reliability

If LEO satellites are positioned directly overhead to improve coverage, then service availability is improved, but interference with GEO satellite receivers increases

Engineering Contradiction:

Improveservice availabilityVSAvoidinterference with GEO receivers

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent segments the operational space by assigning LEO satellites to lower frequency bands and GEO satellites to higher frequency bands. This allows LEO satellites to be positioned directly overhead for improved coverage without interfering with GEO satellite receivers, as the frequency segmentation isolates the two systems from mutual interference.

Inventive Principle:

Principle #1Segmentation

3Object-affected harmful factors

If dynamic satellite selection is used to avoid in-line events, then interference is reduced, but system complexity increases

Engineering Contradiction:

Improveinterference from in-line eventsVSAvoiddynamic satellite selection complexity

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

Instead of dynamically selecting satellites to avoid in-line interference events, the patent inverts the approach by using frequency segmentation to eliminate the interference problem at its source. LEO satellites operate in lower frequency bands while GEO satellites operate in higher frequency bands, making in-line events non-interfering by default and eliminating the need for complex dynamic satellite selection algorithms.

Inventive Principle:

Principle #13The other way round (Inversion)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

This approach eliminates the co-channel interference problem, allowing LEO systems to communicate directly overhead at all latitudes without impacting GEO satellite operations, resulting in increased reliability and flexibility in system design.

Implementation Method 1

a first frequency reference generator provides a first frequency reference signal in a first frequency band for use by a broadband communication receiving channel

Methodology Applied

Scientific EffectElectromagnetic radiation: Electromagnetic Induction

Implementation Method 2

by using higher millimeter wave frequencies to create narrow pencil-beams

Methodology Applied

Scientific EffectBeamforming: Focusing

Implementation Method 3

forming nulls to reduce interference

Methodology Applied

Scientific EffectNull formation: Interference

Data Source

PatentUS20250132813A1Satellite with interference avoidance between satellite systems using common spectrum

Publication Date: 2025.04.24 LOGOS SPACE SERVICES INC

AI summary

A satellite communication system includes a first frequency reference generator and a second frequency reference generator of a satellite or aircraft, a broadband communication receiving channel, and a broadband communication transmission channel. The first frequency reference generator generates a first frequency reference signal in a first frequency band. The broadband communication receiving channel for receiving broadband data at the satellite or aircraft using the first frequency reference signal, wherein a legacy satellite system comprises a legacy communication transmission channel for transmitting data from a legacy satellite in the first frequency band. The second frequency reference generator generates a second frequency reference signal in a second frequency band. The broadband communication transmission channel for transmitting broadband data from the satellite or aircraft using the second frequency reference signal, wherein the legacy satellite system comprises a legacy communication receiving channel for receiving data at the legacy satellite using the second frequency band.