Programmable Satellite PNT Waveforms for Interference Avoidance

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Solution Overview

Problem

Current satellite communication systems, including LEO, MEO, and GEO systems, face interference issues due to shared uplink and downlink frequencies, and Global Navigation Satellite Systems (GNSS) suffer from narrow bandwidths, low broadcast angles, and vulnerability to jamming and spoofing, limiting location resolution and requiring extensive ground station updates.

Innovation Solution

A satellite communication system using reversed frequency bands for satellite-to-earth and earth-to-satellite communications, employing higher frequencies (25.5-42.5 GHz) with direct spread or frequency hopped signals for improved interference avoidance and enhanced PNT data accuracy, including selectable channels and encryption for secure and precise positioning.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If LEO, MEO, and GEO systems operate in co-channel diplex configuration with same uplink and downlink frequencies, then spectrum utilization is improved, but interference between satellite systems increases

Engineering Contradiction:

Improvespectrum utilizationVSAvoidinterference between satellite systems

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent inverts the traditional frequency assignment by having LEO/MEO systems use higher frequencies (25.5-42.5 GHz) for satellite-to-earth downlink while GEO systems use lower frequencies (1-2 GHz), thereby avoiding the interference that occurs when all systems use the same frequency bands for both uplink and downlink

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The patent introduces frequency dimension separation by assigning different frequency ranges to different satellite orbit types, transforming the single-dimension frequency sharing problem into a multi-dimensional frequency allocation scheme that resolves interference while maintaining spectrum efficiency

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Adaptability or versatility

If GNSS systems use narrow bandwidths (approximately 10 MHz) and low broadcast angles, then broad receiver compatibility is improved, but location resolution and anti-jamming capability deteriorate

Engineering Contradiction:

Improvereceiver compatibilityVSAvoidlocation resolution

Core Design Contradiction:

Adaptability or versatilityVSMeasurement precision

Solution Approach 1:

The patent changes the bandwidth parameter from narrow (10 MHz) to wide (100 MHz or more) and increases the broadcast angle from low (near horizon) to high (overhead), thereby simultaneously improving location resolution and anti-jamming capability while maintaining receiver compatibility through backward-compatible signal design

Inventive Principle:

Principle #35Parameter changes

3Device complexity

If GNSS systems use static waveform parameters and low broadcast angles, then signal simplicity is improved, but vulnerability to spoofing and jamming increases

Engineering Contradiction:

Improvesignal structureVSAvoidanti-spoofing and anti-jamming capability

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The patent transforms the static waveform parameters into dynamic parameters that change over time, using time-varying spreading codes and frequency hopping patterns that make spoofing and jamming significantly more difficult while maintaining reasonable signal structure

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent employs periodic modulation patterns and time-division multiplexing with structured frame formats that provide inherent security features, allowing receivers to verify signal authenticity and reject spoofed signals through correlation with expected periodic patterns

Inventive Principle:

Principle #19Periodic action

4Measurement precision

If GNSS satellites rely on regular updates from ground stations for error mitigation, then positioning accuracy is improved, but system complexity and cost increase

Engineering Contradiction:

Improvepositioning accuracyVSAvoidground station infrastructure

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent enables satellites to perform self-calibration and self-correction using onboard atomic clocks and autonomous navigation capabilities, reducing dependence on ground station updates while maintaining positioning accuracy through internal error mitigation mechanisms

Inventive Principle:

Principle #25Self-service

Data Source

PatentUS20250374254A1Waveform and data characteristics for a terminal of a satellite communication system

Publication Date: 2025.12.04 LOGOS SPACE SERVICES INC

AI summary

A receiver system for a satellite communication system includes a processor. The processor is configured to determine a waveform and a set of data characteristics for receiving position and time information by the receiver system for the satellite communication system, wherein the waveform is selectable using a programmable setting; and receiving the position and time information.