Radar Signal Interpolation for Echo Integrity
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Solution Overview
Problem
Radar apparatuses face challenges in displaying accurate echo images due to interference components in reception signals, which are not effectively removed during pulse compression, leading to degraded display quality.
Innovation Solution
A signal processing device that includes a signal input unit, pulse compressor, interference detector, signal level controlling module, and interpolation processing module, which detects and controls interference levels, and interpolates the reception signal in the azimuth direction to maintain echo integrity during pulse compression.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If interference component is removed by replacing signal level to zero, then interference is eliminated, but echo image completeness deteriorates
Solution Approach 1:
The patent uses interpolation processing as an intermediary mechanism to restore echo information that was lost when interference components were removed. The interpolation processing module fills in the gaps created by zero-replacement of interference signals, using adjacent signal values to reconstruct the missing echo information, thereby maintaining image completeness while preserving interference removal effectiveness
Solution Approach 2:
The patent implements a two-stage process where interference components are first discarded (removed by level control) and then the resulting information gaps are recovered through interpolation processing. This discard-recover approach allows selective elimination of harmful interference while restoring the structural integrity and information content of the echo signal
2Measurement precision
If pulse compression is performed on reception signals, then distance resolution is improved, but interference components are extended and become more prominent
Solution Approach 1:
The patent applies interference removal processing before the final signal output stage, detecting and removing interference components from pulse-compressed signals. By performing interference removal as a preliminary action on the already compressed signals, the system maintains the resolution benefits of pulse compression while eliminating the extended interference artifacts that would otherwise degrade the display quality
Solution Approach 2:
The interference detector and level control module extract and remove interference components from the pulse-compressed reception signals. This extraction process separates the harmful interference elements from the useful echo information, allowing the system to retain the improved distance resolution from pulse compression while eliminating the prominent interference artifacts
3Object-affected harmful factors
If interference removing processing is applied, then interference is reduced, but display quality deteriorates due to partial echo loss
Solution Approach 1:
Interpolation processing serves as an intermediary that bridges the gap between interference removal and display quality. It mediates between the need to eliminate interference and the need to maintain reliable echo display by reconstructing missing signal portions, ensuring that the final displayed image maintains both interference-free clarity and complete echo information
Solution Approach 2:
The patent changes the parameter of signal level control by using interpolation to dynamically restore signal values in regions where interference was removed. Instead of permanently setting removed interference regions to zero, the system dynamically calculates and assigns appropriate signal levels based on surrounding data, thereby maintaining display reliability while preserving interference removal benefits
Data Source
AI summary
A signal processing device is provided. The device includes a signal input unit for receiving reception signals obtained from transmission signals reflecting on one or more objects, a pulse compressor for pulse compressing the reception signals, an interference detector for detecting a reception signal caused by interference, from the pulse-compressed reception signals, a signal level controlling module for controlling a level of the detected reception signal, and an interpolation processing module for interpolating the level-controlled reception signal in an azimuth direction.