Multi-Antenna Satellite Tracking Without Mechanical Gimbals
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The keyhole problem in satellite communication arises when antennas struggle to maintain communication with a satellite as it crosses the zenith position, requiring mechanical adjustments that introduce complexity and maintenance needs.
Innovation Solution
A control system manages a group of antennas positioned at specific angles or tilts, ensuring that the keyholes of individual antennas do not overlap, allowing for continuous satellite tracking without mechanical adjustments, by selecting the appropriate antenna based on the satellite's pathway.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single antenna is used to communicate with a satellite, then the device complexity is low, but communication is lost when the satellite crosses the zenith position due to the keyhole problem
Solution Approach 1:
The patent divides the antenna system into multiple fixed antennas (at least two), each with different orientations. This segmentation allows the system to cover different sky regions, with each antenna handling satellites in its specific field of view, thereby eliminating the keyhole problem without requiring mechanical movement.
Solution Approach 2:
The patent introduces spatial diversity by positioning antennas at different orientations and locations. Instead of moving a single antenna in one dimension, the system uses multiple antennas fixed in different spatial dimensions, creating overlapping coverage areas that eliminate blind spots at the zenith position.
2Reliability
If a gimbal system is used to physically move the antenna, then the keyhole problem is addressed, but the device complexity and maintenance requirements increase
Solution Approach 1:
Instead of moving a single antenna to avoid the keyhole, the patent inverts the approach by using multiple fixed antennas with different orientations. Each antenna is stationary, and their combined coverage areas eliminate the keyhole problem without requiring any mechanical movement or gimbals.
Solution Approach 2:
The patent replaces the mechanical gimbal system with a static multi-antenna configuration. Rather than using motors, bearings, and control systems to physically move an antenna, the solution uses multiple fixed antennas whose geometric arrangement provides continuous coverage, eliminating mechanical complexity entirely.
3Reliability
If multiple antennas are deployed to track satellite movement, then continuous communication is maintained, but the device complexity increases
Solution Approach 1:
The patent pre-configures multiple antennas with specific orientations and positions before operation. Each antenna is fixed at predetermined angles to cover specific sky regions, allowing the system to automatically track satellites as they move through different portions of the sky without requiring real-time mechanical adjustment.
Data Source
AI summary
An example system can include a first antenna having a first orientation, a second antenna having a second orientation and a control system communicating with the first antenna and the second antenna. The control system performs operations which can include determining a pathway of a satellite, comparing the pathway to a first radiation pattern of the first antenna and a second radiation pattern of the second antenna, wherein the first antenna and the second antenna are each positioned such that a first keyhole of the first antenna does not overlap a second keyhole of the second antenna, to yield a comparison and selecting, based on the comparison, one of the first antenna or the second antenna to communicate with the satellite along the pathway.