Chirp Signal Detection Interference Suppression
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Solution Overview
Problem
Interference signals, particularly those with frequencies similar to chirp signals, complicate the detection of chirp signals in bus systems, leading to synchronization issues during data transmission, especially in power line systems.
Innovation Solution
A method and system that record and process input signals by calculating a correlation with a chirp reference signal, synthesizing an interference signal, and subtracting it to enhance the signal-to-noise ratio, allowing reliable detection of chirp signals despite interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If correlation detection is used to detect chirp signals, then synchronization capability is improved, but detection reliability deteriorates when interference signals have similar frequencies
Solution Approach 1:
The patent converts the harmful interference signal into a beneficial component by synthesizing an interference signal from the input signal's magnitude and phase characteristics, then subtracting it to reveal the chirp signal. The interference that initially hindered detection is transformed into a removable component that, when eliminated, improves detection reliability.
Solution Approach 2:
The patent introduces intermediate processing steps between the raw input signal and chirp detection: magnitude calculation, phase difference calculation, interference signal synthesis, and subtraction. These intermediary operations separate the chirp signal from the interference by processing them through different mathematical transformations.
2Reliability
If signal processing steps are added to suppress interference, then detection reliability is improved, but computational complexity increases
Solution Approach 1:
The patent makes the interference signal synthesis self-service by deriving it directly from the input signal's own magnitude and phase characteristics. The system uses the input signal's inherent properties to generate its own interference model, eliminating the need for external interference models or additional reference signals.
Solution Approach 2:
The patent transforms the signal processing approach by changing parameters from direct correlation to magnitude calculation, phase difference calculation, and synthesized signal subtraction. This parameter transformation simplifies the mathematical operations while maintaining interference suppression effectiveness.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach effectively suppresses interference signals, ensuring robust data transmission and synchronization between transmitters and receivers, even when interference frequencies match the chirp signal, and is computationally efficient for real-time applications.
Implementation Method 1
calculating an output signal as a correlation from the recorded input signal and a chirp reference signal using a correlator
Implementation Method 2
a synthesized noise signal is then calculated. This signal is derived from the magnitude of the input signal, the magnitude of the output signal, and the phase difference between the input and output signals
Implementation Method 3
A residual signal is then calculated. This residual signal is determined by subtracting the output signal from the synthesized noise signal
Data Source
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AI summary
The invention relates to a method for suppressing an interference signal during detection of a chirp signal from an input signal (X), comprising the following steps: a. recording the input signal (X); b. calculating an output signal (R1) as a correlation from the recorded input signal (X) and a chirp reference signal (CR) by means of a correlator (30); c. calculating a magnitude (XB) of the input signal (X) from the input signal (X); d. calculating a magnitude (R1B) of the output signal (R1) from the output signal (R1); e. calculating a phase difference (P) between the input signal (X) and the output signal (R1); f. calculating a synthesised interference signal (R2) from the magnitude (XB) of the input signal (X), the magnitude (R1B) of the output signal (R1) and the phase difference (P) by means of a rotator (60); g. calculating a residual signal (DR) as the difference between the output signal (R1) and the synthesised interference signal (R2). The invention relates to a system (10) for suppressing an interference signal during detection of a chirp signal by means of the method according to the invention.