Radar Azimuth Estimation Resolving Ghost Targets
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Solution Overview
Problem
Radar devices face increased processing load and erroneous target detection due to the need to distinguish between real and virtual images, especially when multipath propagation occurs, which can lead to ghost detection.
Innovation Solution
A signal processing device that includes an azimuth estimation unit, an estimated reception signal calculation unit, a residual signal calculation unit, and a determination unit to assess the correctness of arrival azimuth estimation based on residual signals, reducing the need for additional radio wave transmission and reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple detection units perform separate radio wave transmission and reception to distinguish real and virtual images, then detection accuracy is improved, but processing load increases
Solution Approach 1:
The patent combines the functions of multiple detection units into a single integrated signal processing device that performs azimuth estimation, residual signal calculation, and target type determination in a unified manner, reducing processing complexity while maintaining detection accuracy
Solution Approach 2:
The patent creates a virtual detection mechanism by calculating estimated reception signals based on azimuth estimation results and comparing them with actual reception signals, effectively simulating additional detection capabilities without requiring separate physical detection units
2Reliability
If additional radio wave transmission and reception are performed to identify ghost targets, then detection reliability is improved, but processing time increases
Solution Approach 1:
The patent performs azimuth estimation and residual signal calculation as preliminary processing steps before final target identification, enabling faster determination of target authenticity by pre-computing key parameters that distinguish real targets from ghosts
Solution Approach 2:
The patent replaces physical radio wave transmission and reception operations with signal processing computations, substituting mechanical electromagnetic wave operations with mathematical calculations on existing reception signals to determine target authenticity
Data Source
AI summary
A signal processing device, includes: an azimuth estimation unit configured to estimate an arrival azimuth of a radio wave based on a reception signal of plural antennas; an estimated reception signal calculation unit configured to calculate an estimated reception signal based on an estimation result of the arrival azimuth, for comparison with the reception signal; a residual signal calculation unit configured to calculate a residual signal which is a difference between the reception signal and the estimated reception signal; and a determination unit configured to determine whether the estimation result of the arrival azimuth is correct based on the residual signal.