Interpolated Virtual Aperture Radar Tracking
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Traditional array-based radar systems are limited by their angular resolution, which depends on the number of elements and their spacing, leading to increased physical size and cost, while synthetic aperture radar systems incur high processing latency and require precise motion data.
Innovation Solution
The Virtual Aperture Array (VAA) radar tracking technique simulates a larger aperture by capturing and processing signals with distinct phase information, allowing for increased angular resolution without physical array expansion or high processing latency, and further enhanced through Interpolated Virtual Aperture Array (IVAA) using sparse physical arrays and interpolation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional array-based radar systems increase the number of array elements to improve angular resolution, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent creates virtual copies of physical array elements through signal processing. By generating virtual array elements from a smaller number of physical elements using interpolation techniques, the system achieves the angular resolution of a large physical array without actually building it. The virtual elements are mathematical constructs that replicate the response of physical elements would have produced.
Solution Approach 2:
The patent transforms the physical array configuration into a virtual array configuration by changing the parameter representation from physical element positions to interpolated virtual element positions. This parameter transformation allows the system to achieve higher angular resolution by effectively increasing the aperture through mathematical interpolation rather than physical expansion.
2Measurement precision
If traditional array-based radar systems increase the spacing between array elements to improve angular resolution, then measurement precision is improved, but the physical size of the array increases
Solution Approach 1:
The patent transitions from the physical spatial dimension to the signal processing dimension by creating virtual array elements. Instead of physically spacing elements farther apart, the system uses interpolation in the signal domain to achieve the equivalent effect of larger spacing, thereby achieving high angular resolution without increasing physical footprint.
Solution Approach 2:
The patent creates virtual representations of array elements that would exist if the physical array were larger. These virtual copies allow the system to achieve the angular resolution characteristics of a large-spaced array while maintaining a compact physical configuration.
3Measurement precision
If synthetic aperture radar systems are used to achieve high angular resolution, then measurement precision is improved, but loss of time increases due to high processing latency
Solution Approach 1:
The patent performs interpolation calculations in advance to create virtual array elements from the received signals. By pre-processing the signals to generate the virtual array representation, the system achieves high angular resolution without the iterative processing delays characteristic of synthetic aperture radar methods.
Solution Approach 2:
The patent replaces the mechanical motion-based approach of synthetic aperture radar with a signal processing-based interpolation approach. Instead of relying on physical antenna movement and complex coordinate transformations, the system uses mathematical interpolation to directly generate virtual array elements, significantly reducing processing latency.
4Measurement precision
If synthetic aperture radar systems are used to achieve high angular resolution, then measurement precision is improved, but device complexity increases due to requirement of precise motion data
Solution Approach 1:
The patent extracts the essential function of aperture synthesis from the complex synthetic aperture radar system by using interpolation on received signals. This extraction removes the requirement for precise motion data and complex coordinate transformations, retaining only the core signal processing function needed to achieve high angular resolution.
Solution Approach 2:
The patent substitutes the mechanical motion-based synthetic aperture approach with a direct signal interpolation approach. This substitution eliminates the need for precise motion tracking and complex geometric calculations, simplifying the system while maintaining high angular resolution capability.
Data Source
AI summary
A method for interpolated virtual aperture array radar tracking includes: transmitting first and second probe signals; receiving a first reflected probe signal at a radar array; receiving a second reflected probe signal at the radar array; calculating a target range from at least one of the first and second reflected probe signals; corresponding signal instances of the first reflected probe signal to physical receiver elements of the radar array; corresponding signal instances of the second reflected probe signal to virtual elements of the radar array; interpolating signal instances; calculating a first target angle; and calculating a position of the tracking target relative to the radar array from the target range and first target angle.