Radar Detection Using AGC Pulse Interval Analysis
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Solution Overview
Problem
Existing radar detection algorithms in wireless network devices often suffer from false detections of radar signals, leading to unnecessary channel blocking and degraded network performance due to interference from noise sources like microwave appliances, which can mimic radar signals.
Innovation Solution
A wireless network device with a signal receiving module and a control module that selectively measures time intervals between control signals to determine if an RF signal is a radar signal by identifying substantially equal intervals, reducing false detections through automatic gain control transitions and pulse width analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional radar detection algorithms are used to detect radar signals in wireless network devices, then radar signals can be detected, but false detections occur due to noise sources like microwave appliances mimicking radar signals
Solution Approach 1:
The patent applies periodic action by measuring multiple time intervals between adjacent pulses and checking if they are substantially equal. Radar signals exhibit periodic pulse patterns with consistent time intervals, while noise sources like microwave appliances do not. By requiring N time intervals to be substantially equal, the method reliably distinguishes periodic radar signals from aperiodic noise, resolving the contradiction between detection reliability and noise discrimination precision.
Solution Approach 2:
The patent changes the detection parameter from simple signal presence to time interval consistency. Instead of merely detecting signal strength or presence, the method measures the time intervals between adjacent pulses and evaluates whether they are substantially equal. This parameter transformation enables reliable differentiation between periodic radar signals and aperiodic noise, simultaneously improving detection reliability and measurement precision.
2Reliability
If radar detection is performed using existing algorithms, then radar signals can be identified, but network performance degrades due to unnecessary channel blocking from false detections
Solution Approach 1:
The patent implements feedback by measuring multiple time intervals and using the consistency of these intervals to confirm radar signal presence. The system continuously monitors pulse patterns and uses the feedback from time interval measurements to make accurate detection decisions. This feedback mechanism prevents false detections that would trigger unnecessary channel blocking, thereby maintaining network performance while ensuring reliable radar signal identification.
Solution Approach 2:
The patent performs preliminary verification by measuring N time intervals between adjacent pulses before confirming radar signal presence and blocking the channel. This preliminary action of verifying time interval consistency prevents premature channel blocking based on false detections. Only after confirming the periodic pattern does the system take the action of channel blocking, thus preserving network performance while maintaining reliable radar detection.
3Speed
If simple radar detection methods are used, then detection speed is maintained, but false detections increase due to inability to distinguish noise from radar signals
Solution Approach 1:
The patent segments the detection process into distinct steps: measuring the first time interval between adjacent pulses, measuring a second time interval, and comparing these intervals to determine if they are substantially equal. This segmentation of the detection process into discrete, sequential measurements maintains detection speed by using simple comparisons while improving reliability through multiple verification points. The segmented approach allows quick decision-making without requiring complex simultaneous measurements.
Data Source
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Figure 3A~3B
AI summary
A wireless network device includes a signal receiving module that receives an RF signal, and a signal processing module that includes an automatic gain control (AGC) module and that generates control signals when a gain of the AGC module changes based on the RF signal. The network device includes a control module that selectively measures N time intervals between one of adjacent and non-adjacent control signals, wherein N is an integer greater than 1, and that selectively determines that the RF signal is a radar signal when the N time intervals are substantially equal.