Satellite Antenna Beam Switching for Interference-Resistant PNT
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Solution Overview
Problem
Current satellite communication systems, including LEO, MEO, and GEO systems, face interference issues due to shared frequencies for uplink and downlink transmissions, 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 higher frequencies (25.5-42.5 GHz) and dynamic frequency reversal to avoid interference, combined with advanced antenna configurations and encryption, enables precise position-navigation-timing (PNT) data transmission with improved ranging accuracy and resistance to jamming.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If LEO, MEO, and GEO systems operate in co-channel diplex configuration using the same frequencies for uplink and downlink, then spectrum utilization is improved, but interference between satellite systems increases
Solution Approach 1:
The patent implements dynamic frequency assignment where LEO and MEO satellites dynamically adjust their operating frequencies based on real-time spatial relationships with GEO satellites. When a LEO/MEO satellite approaches an in-line position relative to a GEO satellite, the system dynamically switches frequencies to avoid interference, enabling both systems to share the spectrum while maintaining communication quality
Solution Approach 2:
The system changes the frequency parameter dynamically based on satellite positions and configurations. By adjusting the operating frequency parameter in response to changing spatial relationships between satellites, the system resolves interference while maintaining efficient spectrum utilization across different orbital regimes
2Object-affected harmful factors
If LEO or MEO terminals dynamically point beams to avoid GEO arcs, then interference to GEO satellites is reduced, but transmission efficiency decreases
Solution Approach 1:
The terminal system dynamically adjusts beam pointing directions and frequency assignments based on real-time calculation of satellite positions and potential interference scenarios. This dynamic adaptation allows the system to maintain optimal transmission efficiency while preventing aggregated power from interfering with GEO satellite reception
Solution Approach 2:
The system employs feedback mechanisms where terminals continuously monitor their transmission paths and adjust beam directions based on calculated interference potential. This feedback loop ensures that transmissions are optimized for efficiency while automatically avoiding configurations that would aggregate harmful power levels at GEO satellites
3Adaptability or versatility
If GNSS systems use narrow bandwidths for PNT signals, then compatibility with broad receiver bases is improved, but location resolution decreases
Solution Approach 1:
The patent segments the signal bandwidth into multiple narrower sub-bands, each optimized for different receiver types and applications. This segmentation allows the system to maintain compatibility with legacy narrow-bandwidth receivers while providing enhanced resolution capabilities through aggregated wide-bandwidth operation for advanced receivers
Solution Approach 2:
The system designs a multi-functional signal structure that can operate in both narrow and wide bandwidth modes, serving both legacy and advanced receivers simultaneously. This universal approach maintains broad receiver compatibility while enabling high-resolution location determination when wide bandwidth is available
4Area of stationary object
If GNSS satellites transmit at low broadcast angles near the horizon, then signal coverage area is improved, but vulnerability to jamming and spoofing increases
Solution Approach 1:
The system dynamically adjusts the broadcast angle of PNT signals based on threat assessments and receiver requirements. By dynamically varying the elevation angle at which signals are transmitted, the system maintains wide coverage area while reducing vulnerability to ground-based jamming and spoofing attempts that typically target low-angle signals
Solution Approach 2:
The patent employs composite signal structures combining multiple frequency bands, modulation schemes, and transmission angles. This composite approach creates a robust PNT signal that maintains wide coverage while resisting jamming and spoofing through diversity in the signal composition
5Measurement precision
If GNSS systems rely on regular ground station updates for error mitigation, then positioning accuracy is improved, but system complexity and cost increase
Solution Approach 1:
The patent implements self-service capabilities where GNSS satellites perform autonomous error mitigation through onboard processing of inter-satellite ranging data and atmospheric model updates. This self-service approach reduces dependence on extensive ground station infrastructure while maintaining high positioning accuracy through satellite-based calibration
Data Source
AI summary
A satellite system includes an antenna and a processor. The processor is further configured to establish initial contact with a receiver using a wide beam antenna setup for the antenna; determine a narrow beam antenna setup based at least in part on receiver data from the initial contact; and provide position coordinates and time information using the narrow beam antenna setup.