Satellite Frequency Band Inversion for Interference-Resistant PNT
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Solution Overview
Problem
Current low earth orbit (LEO), medium earth orbit (MEO), and geosynchronous earth orbit (GEO) satellite 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 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) for improved ranging accuracy and interference resistance, with configurable channels and encryption for secure PNT data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If LEO, MEO, and GEO systems operate in co-channel diplex configuration with shared uplink and downlink frequencies, then spectrum utilization is improved, but mutual interference between satellite systems increases
Solution Approach 1:
The patent segments the frequency spectrum into distinct bands for different satellite systems. LEO/MEO systems use one frequency band while GEO systems use another, preventing co-channel interference. This segmentation allows multiple satellite systems to operate simultaneously without mutual interference while maintaining efficient spectrum utilization.
Solution Approach 2:
The patent inverts the traditional frequency allocation approach by assigning different frequency bands to different orbital systems rather than using shared frequencies. Instead of LEO/MEO/GEO sharing the same uplink and downlink frequencies, each system operates in dedicated frequency bands, eliminating the interference problem while preserving spectrum efficiency.
2Adaptability or versatility
If GNSS systems use narrow bandwidths and low broadcast angles, then receiver compatibility is improved, but location resolution and anti-spoofing capability deteriorate
Solution Approach 1:
The patent changes the bandwidth parameter from narrow to wide. By using wide bandwidth signals, the system achieves both improved location resolution and enhanced anti-spoofing capability while maintaining receiver compatibility. The wide bandwidth provides finer ranging precision and makes signal interception more difficult.
Solution Approach 2:
The patent introduces dynamic waveform parameters that can change over time, making the signal more difficult to spoof while maintaining compatibility with receivers. The dynamic characteristics allow the system to adapt to different operational requirements and enhance security without sacrificing location resolution.
3Measurement precision
If GNSS satellites rely on regular updates from ground stations, then positioning accuracy is improved, but system complexity and cost increase
Solution Approach 1:
The patent enables satellites to autonomously determine their positions using inter-satellite ranging without requiring continuous ground station updates. Each satellite measures distances to other satellites and calculates its own position, eliminating the need for extensive ground infrastructure while maintaining high positioning accuracy.
Solution Approach 2:
The patent transitions from a ground-based reference system to a space-based autonomous positioning system. By using inter-satellite measurements in three-dimensional space, the system achieves accurate positioning without relying on ground station updates, thereby reducing system complexity and cost.
Data Source
AI summary
A system includes a first frequency reference generator of a satellite or aircraft, wherein the first frequency reference generator generates a first frequency reference signal in a first frequency band. The system further includes a communication receiving channel for receiving a first signal at the satellite or the aircraft using the first frequency reference signal. The system further includes a second frequency reference generator of the satellite or the aircraft, wherein the second frequency reference generator generates a second frequency reference signal in a second frequency band. The system further includes a communication transmission channel for transmitting a second signal from the satellite or the aircraft using the second frequency reference signal, wherein a legacy satellite system comprises a legacy communication receiving channel for receiving data at a legacy satellite using the second frequency band.