Radar Interference Suppression Using Parallel Matched Filters
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Solution Overview
Problem
Existing radar systems face challenges in maintaining effective interference suppression performance as the number of radars sharing frequency resources increases, particularly when using orthogonal signal-based frequency sharing, with methods like the CLEAN algorithm failing to adequately suppress radar-to-radar interference.
Innovation Solution
A radar apparatus and method that employs a receiver with parallel matched filters and a signal reconstructor to select the most adequate matched filter for interference suppression, iteratively subtracting reference signals to reconstruct a desired echo signal, using equations to manage the process and ensure termination conditions are met.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple radars share frequency resources to increase frequency utilization efficiency, then frequency utilization efficiency is improved, but radar-to-radar interference increases and detection performance deteriorates
Solution Approach 1:
The patent segments the frequency sharing problem by introducing orthogonal signals for different radars, allowing simultaneous operation on the same frequency while maintaining distinguishability through orthogonal coding sequences
Solution Approach 2:
The patent changes the signal parameters by applying orthogonal codes to transmit signals, transforming the interference problem into an orthogonal signal separation problem that can be solved through correlation processing
2Object-affected harmful factors
If conventional interference suppression algorithms like CLEAN are used, then some interference suppression is achieved, but suppression performance deteriorates as the number of radars increases
Solution Approach 1:
The patent employs an iterative feedback mechanism where the received signal is repeatedly processed through orthogonal correlation, with the strongest interference component identified and subtracted in each iteration, continuing until interference suppression criteria are met
Solution Approach 2:
The patent replaces conventional iterative interference suppression algorithms with an orthogonal signal-based separation approach, substituting complex adaptive processing with simpler correlation-based detection that scales better with the number of radars
3Adaptability or versatility
If orthogonal signals are used for frequency sharing, then frequency sharing capability is improved, but orthogonality is affected by interference suppression algorithm performance
Solution Approach 1:
The patent performs preliminary orthogonal correlation processing to identify and separate interference components before final target detection, ensuring that orthogonality is maintained throughout the processing chain by systematically eliminating identified interference signals
Data Source
AI summary
The present disclosure provides a radar apparatus capable of suppressing a radar-to-radar in-band interference caused by a signal derived from another radar apparatus in a radar system in which a plurality of radar apparatuses share frequency resource to increase a frequency utilization efficiency. The radar apparatus includes: a receiver configured to acquire a received signal; a plurality of matched filters arranged in parallel to filter the receive signal, each corresponding to respective one of the plurality of radar apparatus to use a transmit signal of a corresponding radar apparatus as a reference signal; and a signal reconstructor configured to select a matched filter most adequate for an interference suppression based on outputs of the plurality of matched filters, subtract the reference signal of a selected matched filter at least partially from the receive signal, and reconstruct a desired echo signal to be used to determine a target.