Mobile Phased-Array Antenna Tracking for In-Motion Satellite Links
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Solution Overview
Problem
Existing communication systems struggle to provide global, mobile communication services with high signal quality and capacity, especially in densely populated areas and while in motion.
Innovation Solution
A mobile satellite communication system featuring an antenna mounted on a mobile housing with a satellite transceiver, a motor for tracking satellites, and a local transceiver for data communication, enabling phased-array RF signal communication and channel bonding for increased capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If a satellite communication system uses non-geostationary satellites in LEO or MEO, then the system can provide global coverage and reduce orbital period, but the satellites do not remain stationary relative to specific locations on Earth, requiring complex tracking mechanisms
Solution Approach 1:
The patent applies the Dynamics principle by implementing a motor or actuator that unidirectionally moves the antenna to track non-geostationary satellites along their trajectories. This dynamic tracking mechanism allows the system to maintain communication with moving satellites in LEO or MEO, resolving the contradiction between reduced orbital period and tracking complexity by providing an automated solution that adapts to satellite motion.
Solution Approach 2:
The system employs a controller that automatically controls the motor or actuator to track satellites based on predetermined trajectories without requiring manual intervention. This self-service approach reduces the operational complexity of tracking non-geostationary satellites, allowing the system to autonomously maintain communication links as satellites move across the sky.
2Adaptability or versatility
If the antenna is mounted on a mobile platform such as a vehicle, then the system enables mobile communications globally, but maintaining signal quality while in motion requires precise antenna alignment with moving satellites
Solution Approach 1:
The patent implements a feedback mechanism where a controller receives information about satellite positions and trajectories, then automatically adjusts the antenna orientation using a motor or actuator to maintain optimal alignment. This closed-loop control system ensures reliable signal quality while the mobile platform is in motion, resolving the contradiction between mobile adaptability and signal reliability.
Solution Approach 2:
The system uses predetermined satellite trajectories and ground tracks to pre-calculate and prepare tracking positions before satellites reach optimal communication angles. This preliminary action allows the antenna to be positioned in advance for optimal signal reception, maintaining reliability while the mobile platform moves through different locations.
3Ease of manufacture
If the antenna is designed with a low profile for vehicle mounting, then the system is easier to install and more aerodynamic, but achieving high gain typically requires larger antenna structures
Solution Approach 1:
The patent employs parameter changes by utilizing phased array technology that electronically steers and focuses RF signals through phase shifting across multiple antenna elements. This allows a compact low-profile antenna structure to achieve high gain through electronic beam forming rather than relying on large physical dimensions, resolving the contradiction between ease of installation and antenna gain.
Solution Approach 2:
The system integrates multiple functional components including phased array elements, phase shifters, and electronic control systems into a unified compact antenna assembly. This composite approach enables high-gain performance in a low-profile configuration that is suitable for vehicle mounting, combining the benefits of compactness with high performance.
4Measurement precision
If the system uses phased array antennas with electronic beam steering, then the orientation of RF signals can be determined and adjusted, but the device complexity increases due to multiple antenna elements and control systems
Solution Approach 1:
The patent replaces mechanical antenna rotation and physical repositioning with electronic beam steering using phased array technology. By using phase shifters to electronically control the orientation of RF signals, the system achieves precise signal orientation determination without the mechanical complexity of moving the entire antenna structure, resolving the contradiction between measurement precision and device complexity.
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
The system achieves universal global coverage, improves signal quality by aligning the antenna with the satellite, and increases data capacity and speed through channel bonding, while being operable on vehicles in motion with a low-profile, high-gain antenna.
Implementation Method 1
a motor or actuator to unidirectionally move the antenna to track the one or more satellites
Implementation Method 2
communicate phased-array RF signals
Data Source
AI summary
A global communication system includes a mobile portion; a phased-array antenna attached to the mobile portion; an actuator to move the antenna in one direction to face a satellite; a transceiver to communicate with the satellite; and a processor controlling the actuator to optimize communication from the transceiver.