GNSS Interference Wave Signal Removing Device with Dynamic Notch Filter
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Solution Overview
Problem
Conventional interference wave signal removing devices are ineffective in continuously removing frequency-drifting interference waves due to long detection cycles, leading to incomplete removal of interference signals as their frequencies shift out of the attenuation band set by the notch filter.
Innovation Solution
An interference wave signal removing device with a notch filter, a first frequency scanner for entire-band scanning, and a second frequency scanner for narrow-band scanning, allowing the controller to adjust and track the attenuation frequency band dynamically to maintain continuous removal of frequency-drifting interference signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the conventional interference wave signal removing device scans and detects interference wave signals over an entire frequency band, then the detection can cover all possible interference frequencies, but the detection cycle becomes long causing the interference wave frequency to drift out of the attenuation band
Solution Approach 1:
The frequency band is divided into two segments: a wide frequency band for initial interference wave detection and a narrow frequency band for tracking frequency-drifting interference waves. The frequency scanner alternates between scanning the wide band and the narrow band, achieving both comprehensive detection and rapid tracking without requiring to scan the entire band every time.
Solution Approach 2:
The system dynamically adjusts the frequency band for scanning based on the detection needs. When interference waves are detected in the wide frequency band, the system switches to scanning a narrow frequency band centered on the detected interference wave frequency, allowing the detection cycle to adapt to the current interference conditions and maintain continuous tracking.
2Productivity
If the detection cycle is reduced to track frequency-drifting interference waves, then continuous removal can be maintained, but the detection precision and accuracy of interference wave frequency may be compromised
Solution Approach 1:
The frequency band is divided into two segments: a wide frequency band for initial interference wave detection and a narrow frequency band for tracking frequency-drifting interference waves. The frequency scanner alternates between scanning the wide band and the narrow band, achieving both comprehensive detection and rapid tracking without requiring to scan the entire band every time.
Solution Approach 2:
The system performs preliminary scanning of the wide frequency band to detect and identify interference wave frequencies. Once detected, the system uses this preliminary information to guide subsequent narrow-band scanning, ensuring that the interference wave frequency is always within the scanning range and can be continuously tracked with high precision.
Data Source
AI summary
An interference wave signal removing device that can surely remove an interference wave signal is provided. An interference wave signal remover includes a controller, a notch filter, an entire-range frequency scanner, and a local frequency scanner. The controller detects the interference wave signal based on a frequency scanning result by the entire-range frequency scanner, and sets the notch filter to attenuate the interference wave signal frequency. Based on input signals to the notch filter, the local frequency scanner frequency-scans in a local frequency band including an attenuation band of the notch filter. The controller detects a frequency drift of the interference wave signal frequency based on the frequency scanning result by the local frequency scanner, and updates the setting of the notch filter to attenuate the interference wave signal frequency after the frequency drift.