Millimeter Wave Radar Antenna Segmentation for Noise Rejection
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Solution Overview
Problem
Conventional millimeter wave sensors require a large number of antennas arranged two-dimensionally, leading to a large and costly device, and struggle to effectively reject external disturbances from moving objects.
Innovation Solution
A millimeter wave radar system with a plurality of antennas and a signal processing unit that detects moving objects by analyzing differences in antenna outputs, allowing for the rejection of external noise and estimation of movement direction and speed, while using a minimal number of antennas and separators to prevent interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a large number of millimeter wave receiving antennas are arranged two-dimensionally to detect moving objects, then the ability to detect moving objects is improved, but the device size and cost increase significantly
Solution Approach 1:
The invention divides the detection task into segments by using only 2-4 receiving antennas instead of a large two-dimensional array. Each antenna has a specific reception range, and the system segments the detection process by identifying which antenna detects the moving object and analyzing the signal characteristics from that specific antenna, thereby achieving moving object detection with minimal antennas
Solution Approach 2:
The invention transitions from a two-dimensional spatial arrangement of many antennas to a different dimensional approach by using temporal signal analysis and spatial relationship calculation among fewer antennas. The system detects moving objects by analyzing the time-varying characteristics of signals received by 2-4 antennas and calculating spatial relationships, thereby achieving detection capability without requiring a large two-dimensional antenna array
2Device complexity
If conventional millimeter wave sensors use a minimal number of antennas, then the device size and cost are reduced, but the ability to reject external noise from moving objects deteriorates
Solution Approach 1:
The invention implements feedback mechanisms by continuously monitoring the signals received by 2-4 antennas and using signal processing techniques to identify and reject external noise from moving objects. The system analyzes the time-varying characteristics of received signals and applies feedback-based noise rejection algorithms to maintain reliable detection performance despite using minimal antennas
Solution Approach 2:
The invention changes the parameters of signal processing by analyzing temporal variations in antenna outputs and using these parameter changes to distinguish between target signals and external noise from moving objects. By examining how signal parameters change over time and across different antenna reception ranges, the system achieves noise rejection with minimal antennas
3Area of stationary object
If the reception ranges of multiple antennas overlap, then the detection coverage is improved, but interference disturbances occur between antennas
Solution Approach 1:
The invention extracts and identifies the specific antenna that detects the moving object by analyzing which antenna's reception range contains the moving object. By taking out the signal from the specific antenna that detects the moving object and analyzing it separately, the system avoids interference from other antennas even when their reception ranges overlap, thereby maintaining detection accuracy with minimal antennas
Data Source
AI summary
A millimeter wave radar includes an antenna unit including a plurality of antennas that receive millimeter waves, each of the antennas having a prescribed reception range from which the millimeter waves are incident on the antenna; and a signal processing unit that detects, on the basis of a difference between outputs of the plurality of antennas that have received millimeter waves, a moving object moving across the reception ranges of the plurality of antennas.