Radar Range Side Lobe Removal via Pseudo Signal Subtraction
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Solution Overview
Problem
Conventional radar devices experience false images due to range side lobes, which hinder the detection of weak target objects, as existing methods struggle to effectively separate and remove these lobes without affecting the detection of other objects.
Innovation Solution
A range side lobe removal device that includes a pulse compressor, a pseudorange side lobe generator, and a signal remover, which generates a pseudo signal approximated to the range side lobes and subtracts it from the pulse-compressed signal, reducing false images and enhancing target detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If pulse compression is performed to improve S/N ratio and distance resolution, then detection capability is improved, but range side lobes occur causing false images
Solution Approach 1:
The patent extracts and removes the harmful range side lobe components from the pulse-compressed signal. A range side lobe remover is introduced that generates a pseudo signal representing the side lobes and subtracts it from the original compressed signal, thereby separating the useful target signal from the harmful side lobe artifacts.
Solution Approach 2:
The patent converts the harmful side lobe information into a useful subtractive component. By generating a pseudo signal that models the side lobes and using it for subtraction, the harmful side lobe energy is transformed into a mechanism for removing side lobes, thereby eliminating the false images while preserving the useful signal.
2Reliability
If threshold is set high to avoid false images from range side lobes, then false image detection is reduced, but weak target objects cannot be detected
Solution Approach 1:
The patent extracts and removes the harmful side lobe components from the signal before threshold-based detection. By using a range side lobe remover to generate and subtract pseudo side lobe signals, the clean target signal can be detected at lower thresholds without being contaminated by false side lobe images.
Solution Approach 2:
The patent transforms the side lobe problem into a solution by using the side lobe information to create a subtractive filter. The pseudo signal generated from the received signal is used to remove actual side lobes, thereby enabling detection of weak targets without false alarms from side lobes.
3Object-generated harmful factors
If conventional side lobe reduction methods are used, then some range side lobes are reduced, but false images persist and weak targets remain undetected
Solution Approach 1:
The patent implements a feedback mechanism where the received signal is processed to generate a pseudo side lobe signal, which is then subtracted from the original signal. This feedback loop continuously refines the side lobe removal by using the actual received signal characteristics to generate and subtract the corresponding side lobes, improving both side lobe reduction and target detection accuracy.
Data Source
AI summary
This disclosure provides a range side lobe removal device, which includes a pulse compressor for acquiring a reception signal from a radar antenna and generating a pulse-compressed signal by performing a pulse compression of the reception signal, a pseudorange side lobe generator for generating a pseudo signal of range side lobes of the pulse-compressed signal based on the reception signal, and a signal remover for removing a component corresponding to the pseudo signal from the pulse-compressed signal.