Radar Detection System Using Dynamic Frequency Selection
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Solution Overview
Problem
Wireless network devices operating in the 5 GHz band face challenges in detecting and avoiding radar signals, leading to potential interference, as existing systems may mis-detect radar pulses due to noise or interference, and lack efficient methods to differentiate between tone and chirp radar types.
Innovation Solution
A system comprising a FIFO module, polling module, data extraction module, and control module that analyzes dynamic frequency selection (DFS) information from received pulses to determine if they are radar signals, using criteria such as pulse widths, pulse repetition rates, and signal strength, and differentiates between tone and chirp radar types based on specific patterns and thresholds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If wireless network devices use dynamic frequency selection (DFS) to detect and avoid radar signals, then interference with radar communications is reduced, but false detection of radar pulses due to noise or interference increases
Solution Approach 1:
The patent changes multiple parameters simultaneously including pulse width thresholds, pulse repetition rate thresholds, and signal strength thresholds to differentiate true radar signals from noise. By adjusting these parameters dynamically and using their combination rather than single-parameter detection, the system achieves more reliable radar detection with reduced false positives.
Solution Approach 2:
The patent uses a composite detection approach combining multiple criteria (pulse width, pulse repetition rate, signal strength) to form a composite detection metric. This composite method allows the system to distinguish true radar signals from noise by requiring multiple conditions to be met simultaneously, thereby improving detection reliability while maintaining interference avoidance.
2Speed
If existing systems detect radar pulses using simple threshold methods, then detection speed is maintained, but differentiation between tone and chirp radar types fails
Solution Approach 1:
The patent segments the radar detection process into distinct analysis stages: initial pulse detection, pulse width analysis, pulse repetition rate analysis, and signal strength evaluation. This segmentation allows the system to maintain fast initial detection while performing detailed analysis for radar type identification, resolving the contradiction between speed and precision.
Solution Approach 2:
The patent implements dynamic detection that adapts its analysis depth based on initial findings. The system dynamically adjusts which parameters to analyze and the stringency of thresholds based on the detected signal characteristics, enabling both rapid detection of obvious radar signals and detailed analysis when differentiation between tone and chirp types is necessary.
3Device complexity
If wireless networks operate in the 5 GHz band without sophisticated radar detection, then device complexity is reduced, but regulatory compliance and network reliability deteriorate
Solution Approach 1:
The patent performs preliminary radar detection and classification before the wireless network begins operation on a channel. By conducting thorough radar environment assessment in advance and caching the results, the system ensures reliable compliant operation without requiring continuous complex detection during network operation, thus balancing complexity and reliability.
Data Source
AI summary
A system includes a storing module configured to receive records. The records include dynamic frequency selection (DFS) information. A data extraction module is configured to extract the DFS information from a first plurality of the records. A control module is configured to determine whether the DFS information in each of the first plurality of records is a radar signal and generate a radar detected signal when at least a first predetermined number of the first plurality of records are a first type of radar signal. A polling module is configured to selectively poll the storing module for additional records received after the first plurality of records when at least a second predetermined number and less than the first predetermined number of the first plurality records are the first type of radar signal.