GNSS Tone Processing System for Interference Removal
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Global navigation satellite system (GNSS) receivers face challenges in detecting and removing continuous wave interference tones, which lead to reduced accuracy and increased power consumption due to the need for multiple processing modules and higher sampling frequencies, resulting in increased hardware components and logic area.
Innovation Solution
A tones processing system that includes an interference tone determination module, tracker, and removal module, which sequentially searches for and removes continuous wave interference tones from intermediate frequency data with reduced logic area and power consumption, while compensating for frequency shift and phase rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple notch filter processing modules are used to remove continuous wave interference tones in different frequency bands, then the ability to operate in the presence of interference tones is improved, but the number of hardware components and logic area significantly increase
Solution Approach 1:
The patent combines multiple notch filter processing modules into a single integrated tone processing system that can handle multiple frequency bands. Instead of having separate hardware modules for each frequency band, the system uses a unified architecture with a single notch filter that can be dynamically configured to operate at different frequencies, thereby reducing hardware components and logic area while maintaining the ability to remove interference tones across multiple bands.
Solution Approach 2:
The patent implements dynamic frequency tuning capability in the tone processing system. The notch filter frequency is made variable and can be adjusted in real-time based on the detected interference tone frequencies. This dynamic adaptation allows a single hardware module to replace multiple fixed-frequency modules, reducing device complexity while preserving reliability across different interference scenarios.
2Measurement precision
If higher sampling frequencies are used to process wider bandwidths, then the probability of detecting continuous wave interference tones is improved, but power consumption increases
Solution Approach 1:
The patent dynamically adjusts the sampling frequency based on the detected signal bandwidth and interference characteristics. Instead of using a fixed high sampling rate for all conditions, the system adapts the sampling frequency to match the actual requirements, thereby maintaining detection precision when needed while reducing power consumption during normal operation. This parameter adaptation allows the system to optimize between measurement precision and energy usage.
3Object-affected harmful factors
If notch filters are used to eliminate continuous wave interference tones, then the interference mitigation is improved, but frequency shift is introduced in the intermediate frequency data
Solution Approach 1:
The patent implements a feedback mechanism where the system continuously monitors the frequency content of the processed signal and adjusts the notch filter frequency accordingly. After removing interference tones, the system detects any resulting frequency shifts and compensates for them by adjusting subsequent processing parameters. This closed-loop feedback ensures that interference mitigation is achieved while maintaining frequency accuracy in the intermediate frequency data.
Data Source
AI summary
A tones processing system including an interference tone determination module (ITDM), an interference tone tracker module (ITTM) and an interference tone removal module (ITRM) is provided. The ITDM sequentially searches for one or more continuous wave interference (CWI) tones in N samples of intermediate frequency (IF) data within a programmable signal frequency band. The ITTM tracks the detected CWI tones. The ITRM removes the tracked CWI tones from the N samples of IF data using one or more interference tone removal units (ITRUs). Each of the ITRUs includes a second signal generator, a second mixer, a tone filter for suppressing the tracked CWI tones, and a quantizer for reducing the number of processing bits in a tone suppressed output signal. The ITRM performs frequency shift compensation and phase rotation compensation with reduced logic area and power consumption in the global navigation satellite system, receiver.