Radar Detection Dynamic Frequency Selection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Military radar systems face interference from wireless network communications, leading to false detection of non-radar signals, which can unnecessarily block communication channels and degrade network performance.
Innovation Solution
A wireless network device with a correlation module, automatic gain control module, and control module that accurately determines whether an RF signal is a radar signal by analyzing correlation and gain control signals, pulse width, and zero-crossings, and changes communication channels accordingly to avoid interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If DFS detects radar signals to avoid interference, then radar interference is reduced, but false detections block channels unnecessarily degrading network performance
Solution Approach 1:
The patent changes the detection parameters by analyzing multiple characteristics of the RF signal including pulse width, correlation signal patterns, and gain control signal behavior. By comparing these parameters against predetermined thresholds and patterns, the system accurately distinguishes between genuine radar signals and false detections, thereby reducing unnecessary channel blocking while maintaining protection against actual radar interference.
2Device complexity
If the system uses simple detection methods, then device complexity is reduced, but detection accuracy decreases leading to more false positives
Solution Approach 1:
The patent segments the detection process into multiple independent analysis components: correlation signal analysis, gain control signal analysis, pulse width measurement, and pattern recognition. Each component analyzes a specific aspect of the RF signal separately, and the results are combined to make the final detection decision. This segmentation allows for accurate detection while keeping each individual module relatively simple and manageable.
Solution Approach 2:
The patent introduces intermediary analysis modules that process the RF signal through correlation and gain control stages before final detection. These intermediary modules act as filters and processors that transform the raw signal into processed features (correlation signals, gain control signals) that are easier to analyze and compare against predetermined patterns, thereby improving detection accuracy without requiring overly complex direct analysis.
Data Source
AI summary
A method and apparatus for: receiving a radio frequency (RF) signal on a first channel; determining a radio signal strength of the RF signal; performing a correlation of the RF signal with a predetermined sequence of a wireless data packet to determine whether the RF signal contains the predetermined sequence; in response to the RF signal not containing the predetermined sequence, generating an indication that the RF signal is not a wireless data packet; and determining whether the radio signal strength of the RF signal exceeds a predetermined threshold. In response to i) the radio signal strength exceeding the predetermined threshold and ii) the indication being generated: measuring a parameter associated with the RF signal; determining whether the RF signal is a radar signal based on the parameter; and changing from the first channel in response to the RF signal being determined to be a radar signal.