Vehicle Radar Azimuth Measurement Using Side Lobe Suppression
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Solution Overview
Problem
Conventional vehicle radar systems fail to distinguish main signals from error signals in the elevation angle direction, leading to false sensing due to signals reflected from the ground or ceiling, which affects target sensing and tracking reliability.
Innovation Solution
A radar system with two or more main reception antennas and a single side lobe suppression antenna, where the radar compares the magnitudes of the main and side lobe suppression reception signals to determine the azimuth of a target, using the main reception signal when it is stronger, and adjusts phases to differentiate between normal and abnormal signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional radar systems calculate only azimuth angle without elevation angle, then the system complexity is reduced and costs are lowered, but the system cannot distinguish main signals from error signals in the elevation angle direction, leading to false sensing
Solution Approach 1:
The invention divides the signal reception function into two separate antenna systems: main reception antennas for receiving main signals and side lobe suppression antennas for receiving error signals. This segmentation allows the system to process different signal types through dedicated channels, improving reliability without requiring complex elevation angle calculation in the conventional radar system.
Solution Approach 2:
The side lobe suppression antenna acts as an intermediary element that specifically captures error signals from the ground and ceiling reflections. By introducing this intermediate component, the system can identify and block error signals before they interfere with main signal processing, thereby improving target sensing reliability while maintaining system simplicity.
2Measurement precision
If beam patterns are designed to maintain low side lobe level in regions other than sensing range, then the main beam performance is improved, but signals reflected from ground or ceiling still influence the main signal, causing false sensing
Solution Approach 1:
The invention extracts error signals from the ground and ceiling reflections using dedicated side lobe suppression antennas. These antennas are specifically positioned and configured to capture only the erroneous reflected signals, allowing the system to separate and eliminate them from the main signal processing path, thereby preventing false sensing while maintaining main beam precision.
Solution Approach 2:
The invention converts the harmful ground and ceiling reflection signals into useful information by using side lobe suppression antennas to detect them. The error signals that would normally cause false sensing are instead captured and used as reference signals for comparison, allowing the system to identify and block them, thus transforming a harmful factor into a beneficial detection mechanism.
3Reliability
If the radar compares main reception signal magnitude with side lobe suppression reception signal magnitude, then error signals from ground or elevation angle direction are blocked, but the device complexity increases due to additional antenna and signal processing
Solution Approach 1:
The invention implements dynamic signal processing by continuously comparing the magnitudes of main reception signals and side lobe suppression reception signals. The system adaptively determines whether to use main reception signals or block them based on real-time signal strength comparisons, allowing flexible error signal rejection while maintaining operational simplicity through straightforward magnitude comparison logic.
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
This approach enhances target sensing and tracking reliability by effectively blocking error signals from the ground or elevation angle direction, improving the accuracy of target detection and reducing false sensing.
Implementation Method 1
a radar configured to compare a magnitude of a main reception signal received from the main reception antenna with a magnitude of a side lobe suppression reception signal received from the side lobe suppression antenna
Implementation Method 2
the main reception antenna may include a phase delay unit installed in a center of a line to adjust a first phase and a second phase to same phase, and the side lobe suppression antenna may include a vertical connection part installed in a center of a line to adjust a phase difference between the first phase and the second phase to 180 degrees
Data Source
AI summary
Provided are a radar system for a vehicle and a method for measuring an azimuth therein, which are capable of increasing target sensing and tracking reliability by blocking an error signal that is input from the ground where no vehicle exists or in the elevation angle direction. A system for blocking an error signal input from a ground or in an elevation angle direction includes: two or more main reception antennas; a single side lobe suppression antenna; and a radar configured to compare a magnitude of a main reception signal received from the main reception antenna with a magnitude of a side lobe suppression reception signal received from the side lobe suppression antenna, and measure an azimuth of a target by using the received main reception signal when the magnitude of the main reception signal is larger than the magnitude of the side lobe suppression reception signal.