Airborne Radar Linear Arrays for Drone Obstacle Detection
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Solution Overview
Problem
Current airborne radar systems fail to provide wide angular coverage and rapid obstacle detection necessary for safe drone operation in non-segregated air domains, lacking sufficient warning time, range, and precision in detecting aerial obstacles, while also being cost-prohibitive and inefficient in terms of volume and surface area.
Innovation Solution
An airborne radar system with a transmission system comprising a linear array of radiating elements for electronic scanning and colored emission, combined with a reception system using linear arrays for beamforming, capable of detecting targets through high-resolution spectral analysis and non-coherent integration, employing multiple waveforms for fast and slow targets, and utilizing frequency deviations to resolve ambiguity in angle and distance measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If classic FFC techniques with a two-dimensional receiving antenna fully filled with receiving modules are used, then angular coverage and precision are improved, but device complexity and cost increase significantly
Solution Approach 1:
The patent segments the receive antenna into multiple linear arrays (first linear array and second linear array) oriented in different directions. Each linear array independently processes signals to form beams in specific azimuth ranges. This segmentation reduces the complexity of controlling a fully two-dimensional array while maintaining comprehensive angular coverage through coordinated operation of the segmented arrays.
Solution Approach 2:
The linear arrays serve multiple functions: they perform both reception and transmission operations, and each array can form beams in different azimuth directions by adjusting phase shifters. The same hardware infrastructure supports multiple operational modes (detection, tracking, different scan patterns), reducing overall system complexity compared to dedicated systems for each function.
2Measurement precision
If fine beams are used for measurement precision, then target location accuracy is improved, but the time of observation must be very short, making Doppler processing impossible
Solution Approach 1:
The patent implements dynamic beamforming where the receive beams are electronically steered and adjusted in real-time based on target detection. The phase shifters in each linear array dynamically change beam directions and focus points, allowing the system to track moving targets while maintaining fine angular resolution. This dynamic adaptation enables prolonged observation of targets as they move through different angular positions.
Solution Approach 2:
The patent achieves continuous angular coverage by coordinating multiple linear arrays that scan different azimuth ranges. While one array is observing a particular sector, another array is simultaneously observing a different sector, ensuring continuous target detection and tracking. This continuous action allows for extended observation times and enables Doppler processing to determine target radial velocities.
3Length of stationary object
If a large surface area antenna is used, then range is improved, but volume and surface area constraints for drone installation are violated
Solution Approach 1:
The patent employs direction-dependent beamforming where each linear array concentrates its energy in specific azimuth directions rather than uniformly illuminating all directions. The phase shifters adjust the beam patterns to focus energy toward expected target sectors, providing effective long-range detection in critical directions while using minimal antenna surface area. This local quality optimization allows adequate range performance within constrained physical dimensions.
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 achieves effective wide angular coverage, rapid target detection, and precise location of obstacles, providing a sufficient warning time for collision avoidance while minimizing cost and volume constraints, thus enabling safe drone operation in complex air environments.
Implementation Method 1
the radiating elements being controlled to simultaneously produce electronic scanning of the emission beam in elevation
Implementation Method 2
to form, in reception, multiple beams simultaneously in the illuminated domain: it is This is the technique known as 'Computational Beamforming' or 'CBF'
Implementation Method 3
detecting targets through high-resolution spectral analysis and non-coherent integration
Implementation Method 4
A large range on a fast target, that is to say whose Doppler frequency is located outside that of the ground clutter
Data Source
Figure 1~3
Figure 2
Figure 4~5
AI summary
The airborne radar system having a given angular coverage in elevation and azimuth, it comprises a transmission system (21), a reception system (22) and processing means for performing target detection and localization measurements, the transmission system comprising: - a transmission antenna composed of at least a first linear array (11, 111, 112, 113) of radiating elements (2) focusing a transmission beam, said arrays being substantially parallel to each other; - at least one waveform generator (25, 26); - means for amplifying the transmission signals produced by the waveform generator(s) (25, 26); - means for controlling the transmission signals produced by the waveform generator(s) (25, 26), said means supplying each radiating element (2) with a transmission signal;the radiating elements being controlled to simultaneously produce an electronic scan of the emitted beam in elevation and a colored emission in elevation.