Multipolarized Vector Sensor Antenna for Galactic RF Mapping
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Solution Overview
Problem
Current technologies face challenges in mapping radio frequency galactic noise-like sources below 25 MHz due to ionospheric interference, and there is a need for a deployable system capable of sensing and locating low-frequency galactic emissions from space.
Innovation Solution
A multipolarized vector sensor antenna array system that can be deployed on a tower, balloon, or satellite, featuring a stowable design for launch and deployable in orbit, utilizing a mix of dual-mode elements and air loop feedpoints to generate calibrated amplitude and phase radiation patterns for direction-finding capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If ground-based large diameter antenna array measurements are used for mapping radio frequency galactic noise-like sources, then frequencies above 25 MHz can be mapped, but frequencies below 25 MHz are blocked by the ionosphere
Solution Approach 1:
The patent transitions the measurement system from ground-based to space-based deployment, moving the antenna array above the ionosphere to a different spatial dimension. This eliminates the ionospheric blocking effect that prevents ground-based reception of low-frequency galactic emissions below 25 MHz.
2Reliability
If a satellite sensor orbits above the ionosphere to map galactic RF sources below 25 MHz, then terrestrial interference is reduced due to ionospheric shielding, but the system requires complex deployment mechanisms
Solution Approach 1:
The patent employs flexible conducting tapes that can be rolled or folded into compact configurations for launch, then deployed in space to form the antenna array. This flexible structure approach reduces deployment complexity compared to rigid antenna systems while maintaining the required antenna geometry above the ionosphere.
3Measurement precision
If multipolarized vector sensor antenna systems are deployed in orbit, then low-frequency galactic emissions can be detected, but the antenna elements require compact stowage during launch
Solution Approach 1:
The patent implements a nested stowage configuration where the dipole and loop antenna elements are folded or rolled into compact arrangements that fit within the limited volume of a satellite or balloon payload. The antenna structures are designed to be collapsible into nested configurations for launch, then expanded to their full operational geometry in space.
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
Enables effective detection and location of low-frequency galactic radio frequency emissions by providing calibrated radiation patterns and reducing terrestrial interference, allowing for accurate mapping of galactic sources above the ionosphere.
Implementation Method 1
Due to the total electron content of the ionosphere, radio frequency sources radiating below about 25 MHz are partially or almost completely reflected by the ionosphere
Implementation Method 2
A multipolarized array of collocated antenna elements is used to provide calibrated amplitude and phase radiation patterns with monopole, dipole, and loop modes generated from crossed loops connected to a beamformer
Data Source
AI summary
The present invention generally relates to an electromagnetic field vector sensing receive antenna array system for installation and deployment on a structure. A multipolarized array of collocated antenna elements is used to provide calibrated amplitude and phase radiation patterns with monopole, dipole, and loop modes generated from crossed loops connected to a beamformer. The invention has applications for installation and deployment on a tower, balloon, satellite for radio frequency sensing and location of low-frequency galactic emissions. The novel receive antenna array system comprises a multipolarized vector sensor antenna array. The disclosed direction-finding vector sensor can be installed and deployed on a structure and can detect and locate radio frequency emissions from galactic sources. The key system components of the receive antenna array system consist of deployable antennas, receivers, signal processing computer, and communications link.