4D Radar Tracking Using Phase Monopulse and Beamforming
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Solution Overview
Problem
Traditional array-based radar systems face limitations in angular resolution due to the number of elements in the array and the angle between the array and the target, while phase comparison monopulse techniques are unsuitable for applications like autonomous vehicle sensing due to inherent constraints and ambiguous angle issues.
Innovation Solution
A system and method for 4-dimensional radar tracking that combines phase monopulse comparison and beamforming techniques, utilizing a transmitter and dual polarized receiver arrays to enhance angular resolution and avoid ambiguous angles, with polarization enhancement to refine target identification and calculation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional array-based radar beamforming is used to measure angular position, then the system can operate with a simple array structure, but the angular resolution is limited by the number of elements and array spacing
Solution Approach 1:
The patent combines phase monopulse comparison and beamforming techniques into a unified system. The phase monopulse provides high angular resolution measurements while beamforming provides target detection and initial angle estimation. By merging these two approaches, the system achieves high angular resolution without requiring a large number of array elements or large array apertures.
Solution Approach 2:
The patent uses beamforming as an intermediary to provide initial target detection and coarse angle estimation, which then guides the phase monopulse measurement process. This intermediary step allows the system to achieve high precision angular measurements only when needed, reducing the overall complexity requirements compared to using phase monopulse alone across all operating conditions.
2Measurement precision
If phase comparison monopulse techniques are used to achieve high angular resolution, then angular measurement precision improves, but the system suffers from ambiguous angle issues and cannot operate in wide angle ranges
Solution Approach 1:
The patent segments the angle measurement process into two distinct stages: first, beamforming provides coarse angle estimation and target detection across a wide field of view; second, phase monopulse provides fine angular resolution measurements only for detected targets. This segmentation allows each method to operate in its optimal range, combining wide coverage with high precision.
Solution Approach 2:
The patent adds a temporal dimension to the measurement process by using sequential operations. Beamforming first identifies target presence and provides initial angle estimates, then phase monopulse refines these measurements. This dimensional approach to problem-solving allows the system to overcome the inherent limitations of each individual technique.
3Measurement precision
If array element spacing is increased to improve angular resolution in phase monopulse systems, then measurement precision improves, but angle ambiguity increases and operational angle range decreases
Solution Approach 1:
The patent merges the strengths of both approaches: beamforming with small element spacing provides unambiguous angle estimates across wide angles, while phase monopulse with larger effective spacing provides high angular resolution. By combining these complementary characteristics, the system achieves both reliability and precision without the trade-offs of using either method alone.
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
This approach achieves heightened angular resolution without sacrificing the convenience of beamforming array radars, enabling accurate 4-dimensional target identification and tracking with improved accuracy and wide angle-of-operation, suitable for applications like autonomous vehicle sensing.
Implementation Method 1
Traditional array-based RADAR receivers calculate azimuth and/or elevation by measuring the time or phase difference between received probe signals at different receivers (or antennas) within the array(s)
Implementation Method 2
A system for Doppler-enhanced radar tracking includes a transmitter, a horizontal receiver array, a vertical receiver array, and a signal processor
Data Source
AI summary
A method for four-dimensional radar tracking includes transmitting a first probe signal; receiving a first reflected probe signal at first and second radar arrays of the radar system; detecting a tracking target; calculating a target range; calculating a target range rate; performing ambiguous angle calculations for first and second target angles; performing unambiguous angle calculations for the first and second target angles; and calculating a four-dimensional tracking solution, including position and range-rate, from the target range, target range-rate, ambiguous angle calculations, and unambiguous angle calculations.