Radar Signal Processing Device Time-Domain Smoothing Filter
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional radar systems face challenges in accurately detecting targets using beat signals due to large signal level fluctuations in the azimuth direction, leading to erroneous interference signal determination and a decrease in signal-to-noise (SN) ratio.
Innovation Solution
A radar signal processing device that generates a smoothed signal by filtering the beat signal using a smoothing filter in the time domain, allowing for accurate detection of interference signals and suppressing erroneous determinations, thereby maintaining a high SN ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional interference removal processing in the azimuth direction is applied to the beat signal, then interference signals can be removed, but erroneous determination of interference signals occurs due to large signal level fluctuation in the azimuth direction
Solution Approach 1:
The patent changes the processing domain from azimuth direction to time domain, and transforms the signal representation by taking the absolute value and logarithm of the beat signal. This parameter transformation converts the signal level fluctuation problem into a form suitable for time-domain smoothing filter processing, thereby resolving the contradiction between interference removal and erroneous determination.
Solution Approach 2:
The patent introduces a smoothing filter as an intermediary processing step between the beat signal and interference signal detection. This intermediary component smooths the signal level fluctuations in the time domain, enabling accurate interference signal detection without erroneous determination caused by direct azimuth-direction processing.
2Object-affected harmful factors
If interference removal processing is applied to the beat signal, then interference waves can be removed, but the signal-to-noise (SN) ratio of the power spectrum decreases
Solution Approach 1:
The system uses the beat signal itself to generate the smoothed signal through time-domain filtering, and then uses this smoothed signal to detect and remove interference. This self-service approach allows the signal to be processed in a way that removes interference while preserving the original signal characteristics and SN ratio.
Data Source
AI summary
A radar signal processing device includes: a processing circuitry configured to generate a processing signal based on a beat signal obtained from a transmitted signal and a received signal, generate a smoothed signal by filtering the processing signal using a smoothing filter in a time domain; and detect an interference signal included in the beat signal based on the processing signal and the smoothed signal.