Radio Signal Processing for Radar Pulse Mitigation

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Solution Overview

Problem

Existing radio signal processing methods struggle to effectively detect and mitigate the interference caused by radar signals, which can distort telecommunications signals, especially in maritime radio stations where radar signals from different frequencies and powers can overwhelm the radio receiver.

Innovation Solution

A method and device that estimate the instantaneous power of radar pulses, calculate the ratio between the average power of the telecommunications signal and the radar pulses, and modify the radio signal at locations where the ratio is below a threshold, using techniques like blanking or clipping to neutralize the radar interference.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Power

If radar signals are transmitted with high power, then radar detection capability is improved, but interference to telecommunications signals increases

Engineering Contradiction:

Improveradar signal powerVSAvoidinterference to telecommunications signals

Core Design Contradiction:

PowerVSObject-affected harmful factors

Solution Approach 1:

The patent detects radar pulses within the telecommunications signal and uses their known characteristics (timing, power levels) to identify and neutralize them. By converting the harmful interference into detectable patterns, the system can apply targeted processing to remove the radar signals while preserving the telecommunications content.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

The patent applies different processing strategies based on the instantaneous power ratio between telecommunications signal and radar pulses. When radar pulses dominate (low ratio), aggressive noise reduction is applied; when telecommunications signal dominates (high ratio), minimal processing is used. This localized adaptation resolves the contradiction by treating different signal conditions differently.

Inventive Principle:

Principle #3Local quality

2Reliability

If noise reduction processing is applied to remove radar interference, then signal integrity is improved, but detection difficulty increases

Engineering Contradiction:

Improvesignal integrityVSAvoiddetection of radar pulses

Core Design Contradiction:

ReliabilityVSDifficulty of detecting and measuring

Solution Approach 1:

The patent performs preliminary detection of radar pulses by analyzing instantaneous power ratios before applying noise reduction processing. By detecting the presence and characteristics of radar pulses in advance, the system can prepare appropriate processing parameters, making both detection and subsequent noise reduction more effective.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent uses feedback from the detected radar pulse characteristics (timing, power, pattern) to adjust the noise reduction processing. The system continuously monitors the signal, detects radar interference, and adapts the processing intensity based on the detected conditions, improving both detection accuracy and signal integrity preservation.

Inventive Principle:

Principle #23Feedback

Data Source

PatentEP4016118B1Method for processing a radio signal disrupted by a radar signal

Publication Date: 2025.08.27 COMMISSARIAT A LENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES

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AI summary

This description relates to a method of processing by a radio transmitter/receiver (12) a radio signal (Sr) comprising a telecommunications signal disturbed by pulses of a radar signal, the method comprising the following steps estimating the instantaneous power of the pulses, estimating the ratio between the average power of the telecommunications signal and the instantaneous power of the radar pulses, and modifying the radio signal at the locations of the radar pulses when said ratio is less than a threshold.