PSK Tonal Interference Detection for Stable Carrier Locking
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing PSK systems fail to detect and remove in-band tonal interference, which disrupts frequency and phase locking, leading to poor signal quality due to undetected dual carrier signals.
Innovation Solution
A method and system that detects the frequency of tonal interference by using a phase lock loop, lock counter, frequency channelizer, and spectral anomaly processor to identify and isolate the interference within the PSK signal's information bandwidth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional filtering stages are used in PSK systems, then the carrier and PSK signal information bandwidth are preserved, but in-band tonal interference remains undetected and disrupts frequency and phase locking
Solution Approach 1:
The patent segments the PSK signal into multiple frequency channels using a frequency channelizer. By dividing the signal spectrum into discrete channels, the system can independently analyze each channel for tonal interference while preserving the overall carrier and information bandwidth structure. This segmentation enables targeted detection without disrupting the fundamental PSK signal components.
Solution Approach 2:
The patent introduces an intermediary detection system consisting of a lock counter, frequency channelizer, and spectral anomaly processor. This intermediary layer sits between the traditional filtering stages and the final signal output, allowing tonal interference to be detected and identified without directly interfering with the carrier or information bandwidth. The intermediary processes the signal to reveal hidden tonal components while leaving the main signal integrity intact.
2Manufacturing precision
If no tonal interference detection is implemented, then the system complexity remains low, but signal quality deteriorates due to undetected dual carrier signals
Solution Approach 1:
The patent implements preliminary action by detecting and identifying tonal interference before it can significantly degrade signal quality. The lock counter and frequency channelizer operate continuously to preemptively identify tonal components, allowing the system to take corrective action or flag the interference before it causes substantial harm to signal quality. This proactive approach improves signal quality without requiring complex real-time intervention systems.
Solution Approach 2:
The patent replaces traditional mechanical or analog filtering methods with a digital signal processing approach using frequency channelization and spectral analysis. Instead of relying on complex analog filter networks to physically remove tonal interference, the system uses digital algorithms to identify and characterize tonal components in the frequency domain. This substitution achieves better signal quality with more manageable system complexity.
3Ease of operation
If frequency and phase lock loops are used to adjust to the carrier, then the PSK signal can be properly demodulated, but the presence of strong sinusoidal interference prevents the loops from settling on a dominant frequency
Solution Approach 1:
The patent applies preliminary anti-action by using the frequency channelizer and spectral anomaly processor to identify and characterize tonal interference before it can disrupt the frequency and phase lock loops. By detecting the presence and frequency of tonal components in advance, the system can compensate for their effect or alert operators to adjust the locking parameters. This preliminary counter-measure allows the lock loops to maintain stability despite the presence of strong sinusoidal interference.
Solution Approach 2:
The patent implements feedback by continuously monitoring the frequency channels and spectral content of the PSK signal. The spectral anomaly processor provides feedback information about detected tonal interference back to the frequency and phase lock loops, allowing them to dynamically adjust their operation. This feedback mechanism enables the locking system to maintain stability by compensating for the presence of tonal interference through real-time parameter adjustments.
Data Source
AI summary
A method for detecting tonal interference in phase shift keyed signal modulations includes feeding a phase shift keyed signal with an error signal through a lock loop from a phase lock loop. The lock loop feeds the phase shift keyed signal with an error signal through a lock counter that counts a time for the error signal to measure a voltage below a minimum threshold. An enable signal is sent via the lock counter to the frequency channelizer module when the voltage drops below the minimum threshold. The frequency channelizer module splits a spectral content of the phase shift keyed signal into frequency channels. An output of the frequency channels is sent via the frequency channelizer module to a spectral anomaly processor. An automated test is performed with the spectral anomaly processor for each frequency channel, thereby determining a frequency or phase band of the tonal interference.