Pulse Compression Side Lobe Removal Without Main Lobe S/N Loss
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Solution Overview
Problem
Existing signal processing devices in radar systems face a drop in signal-to-noise (S/N) ratio when removing side lobes from pulse compressed signals, as the process lowers the signal level of the main lobe.
Innovation Solution
A signal processing device that includes a pulse compressing module, a pseudo signal generating module, and a side lobe removing module, where the pseudo signal is generated with a lower signal level for the main lobe portion compared to the side lobe portions, allowing for the removal of side lobes without deteriorating the main lobe signal level.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If the pseudo signal of side lobes is removed from the pulse compressed signal, then the side lobes are removed, but the signal level of the main lobe lowers and the S/N ratio drops
Solution Approach 1:
The patent applies local quality by creating a pseudo signal where different regions have different signal levels - the pseudo side lobe portions have higher signal levels than the pseudo main lobe portion. This allows selective removal of side lobes while preserving the main lobe signal level in the pulse compressed signal.
Solution Approach 2:
The patent inverts the conventional approach by generating a pseudo signal with reversed signal level characteristics - instead of the pseudo main lobe having higher level than pseudo side lobes, the pseudo side lobes are made to have higher levels. This inversion enables side lobe removal without main lobe degradation.
2Reliability
If pulse compression is performed on the reception signal, then the S/N ratio is improved, but side lobes are generated in the pulse compressed signal
Solution Approach 1:
The patent extracts and removes the harmful side lobe components from the pulse compressed signal by subtracting a generated pseudo signal. The pseudo signal is specifically designed to match the side lobe characteristics while having suppressed main lobe content, enabling selective extraction of side lobes without affecting the main lobe.
Solution Approach 2:
The patent introduces a pseudo signal as an intermediary element that mediates between the pulse compressed signal and the desired output. This pseudo signal serves as a template for side lobe characteristics that can be subtracted to remove actual side lobes while preserving the main lobe through careful design of the pseudo signal's main lobe suppression.
Data Source
AI summary
A signal processing device is provided, which includes a pulse compressing module configured to generate a pulse compressed signal obtained by performing pulse compression on a reception signal that is a reflection of a transmission signal transmitted to outside the device, a pseudo signal generating module configured to generate, based on the reception signal, a pseudo signal of which a pseudo main lobe portion corresponding to a main lobe of the pulse compressed signal has a lower signal level than signal levels of pseudo side lobe portions corresponding to side lobes of the pulse compressed signal, and a side lobe removing module configured to remove the pseudo signal from the pulse compressed signal.