MIMO Radar Speed Determination Using Vertical Angle Validation
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Solution Overview
Problem
MIMO radar systems face limitations in speed detection range and accuracy, particularly in estimating arrival angles in the vertical direction, due to the low observable speed and issues with phase differences between transmission antennas, leading to false speed detection and reduced electric power.
Innovation Solution
A speed detection apparatus with a transmission antenna array and reception antenna array configured in a vertical direction, using a speed determination unit to calculate speed candidates and determine true vertical arrival angles within a dynamically adjusted threshold range, allowing for expanded speed detection and accurate angle estimation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of transmission antennas N increases in MIMO radar, then the spatial resolution and detection capability are improved, but the observable speed Vmax decreases
Solution Approach 1:
The patent segments the speed detection problem into multiple speed wrap regions (first speed wrap, second speed wrap, etc.), each corresponding to different burst interval configurations. By dividing the overall speed detection task across multiple segmented regions with different N values, the system can detect targets across a wide speed range while maintaining spatial resolution in each segment.
Solution Approach 2:
The patent dynamically adjusts the burst interval configuration based on the detected speed range. When a target is detected in a particular speed wrap region, the system changes the burst interval to match that region's characteristics, allowing the observable speed to adapt to the target's actual speed while maintaining optimal spatial resolution for that speed range.
2Speed
If speed expansion methods are applied to MIMO radar, then the detectable speed range is expanded, but the method cannot be applied to vertical direction arrival angle estimation
Solution Approach 1:
The patent creates a universal speed determination method that works for both horizontal and vertical direction arrival angle estimation. By using multiple transmission antennas arranged in the vertical direction and applying the same speed wrap region classification method, the system achieves speed expansion that is applicable to vertical angle estimation, making the method versatile across different detection scenarios.
3Area of stationary object
If multiple chirp signals are transmitted from multiple transmission antennas, then the detection coverage is improved, but false speed detection and ghost occurrence increase
Solution Approach 1:
The patent uses feedback from the arrival angle estimation results to verify speed measurements. By checking whether the estimated arrival angles are consistent across different speed wrap regions, the system can identify and eliminate false speed detections and ghosts, thereby maintaining high detection accuracy while preserving wide detection coverage.
Solution Approach 2:
The patent introduces arrival angle estimation as an intermediary verification step between speed detection and final target confirmation. This intermediary process helps distinguish true targets from false detections by checking geometric consistency, thereby improving reliability without reducing detection coverage.
Data Source
AI summary
To obtain a speed expansion range.A speed detection apparatus includes: a transmission antenna array that transmits a plurality of chirp signals multiplexed between a plurality of transmission antennas arranged in a vertical direction; a reception antenna array that includes a plurality of reception antennas receiving the plurality of chirp signals that has been reflected; and a speed determination unit that calculates a plurality of speed candidates on the basis of the plurality of chirp signals received by the reception antenna array, determines whether or not a plurality of vertical arrival angle estimation values corresponding to the plurality of speed candidates falls within a vertical angle threshold range, and determines, as a true speed, one speed candidate from the plurality of speed candidates on the basis of a determination result.