RF Antenna Array Localization via Signal Measurement Comparison
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Solution Overview
Problem
Current SAR systems face challenges in accurately determining the location of antenna arrays during imaging, leading to ambiguity between target and array location, which affects image resolution and target tracking.
Innovation Solution
A device with an array of transducers and a processor unit that compares signal measurements from different locations to calculate the movement of the device relative to a reference location, using transfer functions and log-likelihood functions to estimate displacement and rotation, without relying on costly sensors like gyroscopes or IMS systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If current SAR systems use IMS (Inertial Measurements Systems) and data driven auto focus algorithms to estimate displacement and correct errors, then location estimation can be achieved, but the system complexity and cost increase significantly
Solution Approach 1:
The patent extracts the location estimation function from complex external systems (IMS, gyroscopes) and implements it within the signal processing unit using signal measurements and transfer functions. This separates the core imaging function from the location estimation function, achieving accurate location tracking without requiring additional costly sensor systems.
Solution Approach 2:
The system uses its own received signal measurements and transfer functions to estimate its location and orientation, rather than relying on external sensor systems. The signal processing unit processes the signals already being received for imaging purposes to simultaneously determine location and orientation, making the system self-sufficient.
2Manufacturing precision
If autofocusing algorithms are used to correct SAR measurement errors, then image quality improves, but ambiguity between target and array location persists
Solution Approach 1:
The patent implements a feedback mechanism where the system continuously estimates its location and orientation using signal measurements and transfer functions, then uses this information to correct SAR measurements in real-time. This feedback loop eliminates location ambiguity by providing accurate array position information that is used to properly focus and locate targets in the final image.
Data Source
AI summary
The methods and device disclosed herein provide an array such as a Radio Frequency (FR) antenna array for measuring the array movement or displacement of the array relative to a reference location. In some cases the array may be attached to or in communication with the device. The array comprises at least two transducers (e.g. RF antennas), wherein at least one of the at least two transducers is configured to transmit a signal towards the object, and at least one transceiver attached to said at least two transducers, the at least one transceiver is configured to repetitively transmit at least one signal toward an object and receive a plurality of signals affected or reflected while the array is moved in proximity to the object/medium or scene; and at least one processor unit, configured to: process the affected signals to yield a plurality of signal measurements and compare said signal measurements obtained at different locations over time of said second object and calculate a movement of the object relative to a reference location.