MESA Radar Interferometry for Compact TSPI Tracking
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Solution Overview
Problem
Conventional radar tracking systems face limitations in accuracy and cost due to the size, weight, and power constraints of phased arrays, particularly when tracking multiple objects in near real-time, and fixed antenna designs are not suitable for applications requiring variable direction and gain.
Innovation Solution
A system comprising at least three electronically steered antennas arranged in a triangular formation with a predetermined baseline difference, allowing for precise beam steering and interferometry to determine the location of targets, using metamaterial electronically scanned array (MESA) receivers and interferometer logic to process reflected electromagnetic signals and distinguish real objects from ambiguities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the distance between radar elements in a phased array is increased to improve measurement precision, then TSPI measurement accuracy is improved, but the size, weight, and power consumption increase proportionally to the square of the distance
Solution Approach 1:
The system divides the phased array into multiple sub-arrays, each with a compact footprint. By segmenting the overall array structure, the patent achieves long effective baseline distances for high precision TSPI measurements while keeping each physical sub-array compact, thus reducing total system weight and power requirements.
Solution Approach 2:
The patent transitions from a two-dimensional phased array layout to a three-dimensional distributed array configuration. By utilizing vertical stacking and spatial distribution across multiple dimensions, the system achieves long baseline distances without proportionally increasing the ground footprint, thereby reducing weight and power consumption while maintaining measurement precision.
2Measurement precision
If the number of antenna elements is increased to improve TSPI measurement accuracy, then measurement precision is improved, but device complexity and cost increase due to additional transmit/receive modules and support systems
Solution Approach 1:
The patent designs antenna elements and transmit/receive modules that perform multiple functions simultaneously. Each module serves both as a phased array element for beamforming and as an interferometry sensor for precise TSPI measurement. This multi-functionality reduces the total number of components needed, thereby decreasing system complexity and cost while maintaining high measurement accuracy.
Solution Approach 2:
The patent merges the phased array processing functions with interferometry processing functions into a unified system architecture. By combining these previously separate functional paths, the patent eliminates redundant hardware and software components, reducing overall system complexity and cost while achieving both beam steering and precise TSPI measurement capabilities.
3Productivity
If conventional phased array techniques are used to track multiple objects, then multiple target tracking capability is improved, but measurement accuracy is limited by size, weight, and power constraints
Solution Approach 1:
The patent implements dynamic reconfiguration capability that allows the system to adaptively adjust the phased array beamforming patterns and interferometry processing parameters based on the number, location, and motion characteristics of tracked objects. This dynamic optimization enables the system to maintain high TSPI measurement accuracy for multiple simultaneously tracked targets despite the inherent trade-offs in system size, weight, and power.
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 provides highly accurate time-space-position information (TSPI) for multiple objects, including airborne, ground, and naval targets, with reduced size, weight, and power consumption, enabling rapid direction changes and improved tracking capabilities without increasing system complexity or cost.
Implementation Method 1
Interferometers are devices that measure the interference pattern produced by the superposition of two or more waves, such as those of electromagnetic radiation.
Implementation Method 2
A system comprising at least three electronically steered antennas arranged in a triangular formation with a predetermined baseline difference, allowing for precise beam steering and interferometry to determine the location of targets, using metamaterial electronically scanned array (MESA) receivers and interferometer logic to process reflected electromagnetic signals
Data Source
AI summary
The present disclosure is a system comprising at least three electronically steered antennas arranged so that there is a baseline difference of a predetermined amount of wavelength between the centers of the antennas, typically configured as an obtuse or scalene triangle, where the distance between each antenna on an array is selected to provide the required accuracy and precision, the array having a timing circuit to ensure that the beam of each antenna is steered to the same azimuthal and elevation coordinates in space simultaneously. This enables the three electronically steered antennas to operate as an interferometer to determine a bearing to a target to ultimately determine the location thereof. The electronically steered antennas enable the system to be mounted on a platform in a small package that was previously difficult for traditional interferometers.