Radar Antenna Virtual Array Coprime Spacing Isolation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing radar apparatus has poor reception channel isolation due to coincident arrangement intervals of reception antennas, leading to decreased detection accuracy of object orientation.
Innovation Solution
A radar apparatus with transmission and reception antennas arranged in a virtual array, where the intervals between reception antennas are set to differ from those of transmission antennas, forming a virtual array with improved channel isolation and detection accuracy by using phase-shift keying and coprime multiples for antenna spacing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the arrangement interval of reception antennas is set equal to the arrangement interval of transmission antennas, then the virtual array formation is simplified, but the reception channel isolation deteriorates
Solution Approach 1:
The patent applies asymmetry by setting the arrangement interval of reception antennas (second interval) to be different from the arrangement interval of transmission antennas (first interval). Specifically, the second interval is set to a multiple of the minimum interval that is different from the first multiple, creating an asymmetric configuration that improves reception channel isolation while maintaining virtual array functionality.
2Quantity of substance
If the arrangement interval of reception antennas is reduced, then the number of antennas can be increased within a given space, but the detection accuracy of object orientation deteriorates
Solution Approach 1:
The patent creates a virtual array in a dimensional space that extends beyond the physical arrangement of antennas. By forming virtual reception antennas through the combination of transmission and reception antennas with different intervals, the system achieves equivalent performance to having more physically separated antennas, thereby maintaining orientation detection accuracy while fitting within constrained physical spaces.
3Reliability
If the physical reception-channel interval is widened, then the isolation between reception channels improves, but the device size increases
Solution Approach 1:
The patent introduces virtual reception antennas as an intermediary concept that mediates between the physical antenna arrangement and the required channel isolation. By processing signals to create virtual antennas with larger effective spacing than the physical antenna spacing, the system achieves the required isolation without physically increasing the device size.
Data Source
AI summary
A transmission antenna unit includes transmission antennas arranged in a row along a predetermined array direction at a predetermined first interval. A reception antenna unit includes reception antennas arranged in a row along the array direction at a second interval set to differ from the first interval. The transmission antennas and the reception antennas form a virtual array in which virtual reception antennas are arranged in a row along the array direction. The first interval is equal to a multiplication value of a minimum interval being a minimum value of an arrangement interval of the virtual reception antennas and a first multiple being an integer of 2 or greater. The second interval is equal to a multiplication value of the minimum interval and a second multiple being an integer of 2 or greater and set to differ from the first multiple. The first and second multiples are coprime.