Radar Range Side Lobe Detection and Removal Circuit
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Solution Overview
Problem
Range side lobes in radar apparatuses can lead to erroneous target detection and deteriorate signal-to-interference ratios, particularly in wide-angle radar systems, as they can mistakenly identify range side lobes as targets and affect the detection of other targets with lower reflection levels.
Innovation Solution
A radar apparatus with an estimation circuit that determines the distance and direction of targets based on reception signals and a processing circuit that identifies and removes range side lobe components, improving target detection performance by distinguishing between main lobes and side lobes regardless of modulation/demodulation processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If wide-angle radar detection is implemented to detect targets in a wider angle range, then the detection coverage is improved, but range side lobes cause erroneous target detection and deteriorate signal-to-interference ratios
Solution Approach 1:
The patent segments the detection space by using direction information to identify and separate side lobe components from main lobe components. The processing circuit divides the reception signal into different spatial regions, allowing independent processing of side lobes and main lobes, thereby maintaining detection coverage while improving accuracy
Solution Approach 2:
The patent introduces direction information as an intermediary parameter to distinguish between side lobes and main lobes. By incorporating angular information from the estimation circuit, the processing circuit can identify side lobe components without affecting the main detection function, thus resolving the contradiction between coverage and accuracy
2Measurement precision
If range side lobes are removed to improve target detection accuracy, then false detections are reduced, but the complexity of the processing circuit increases
Solution Approach 1:
The patent merges the side lobe removal function with the existing target detection processing circuit. By integrating the side lobe identification and removal operations into the existing estimation and detection framework, the patent improves detection accuracy while minimizing the increase in overall system complexity
Solution Approach 2:
The processing circuit uses the direction information already generated by the estimation circuit to automatically identify and remove side lobes. The system leverages its own existing data outputs to perform the side lobe removal function without requiring entirely separate processing pathways, thereby limiting complexity growth
3Device complexity
If conventional target detection is used without side lobe removal, then the device complexity is low, but erroneous detections occur due to range side lobes being mistaken for targets
Solution Approach 1:
The patent performs side lobe identification and removal as a preliminary step before final target detection. By removing side lobe components from the reception signal before the detection decision is made, the patent prevents erroneous detections without requiring complex post-processing or additional hardware
Data Source
AI summary
Provided is a radar apparatus including: an estimation circuit; and a processing circuit. The estimation circuit outputs a plurality of pieces of data each including information in which a distance to a target and a direction to the target are estimated based on a reception signal including a reflected wave that is a radar signal reflected by the target. The processing circuit determines a range side lobe component in the target based on the estimated distance and the estimated direction of one or more pieces of data selected from the plurality of pieces of data.