GNSS Interference Suppression via Adaptive Reference Signal Copying
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Solution Overview
Problem
GNSS receivers face challenges in suppressing interference, particularly from harmonic frequencies that fall within their bands, leading to unrecoverable errors when GNSS signals are weak, and existing solutions are complex and costly.
Innovation Solution
A signal processing apparatus and method that generates a target estimated signal for specific signal components, such as jammer signals, using a reference signal generating circuit, signal processing circuit, and signal adjusting circuit to adjust and output a target estimated signal, effectively reducing frequency and amplitude offsets to suppress interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional interference suppression methods are used, then interference can be suppressed, but the device complexity and cost increase significantly
Solution Approach 1:
The patent creates a copy of the interference signal by generating a reference signal that mimics the characteristics of the actual interference. This reference signal is then processed through the same signal path and combined with the input signal to cancel the interference, avoiding the need for complex dedicated interference suppression hardware
Solution Approach 2:
The patent introduces a reference signal as an intermediary element that mediates between the interference source and the GNSS receiver. This reference signal serves as a proxy that carries interference characteristics without requiring direct access to the interference source, simplifying the overall system architecture
2Reliability
If conventional interference suppression methods are used, then interference can be suppressed, but the implementation cost increases
Solution Approach 1:
By copying interference characteristics into a reference signal rather than using expensive dedicated interference cancellation hardware, the patent achieves effective suppression at lower implementation cost
Solution Approach 2:
The reference signal generation and processing circuitry serves multiple functions: it tracks interference characteristics, generates cancellation signals, and adapts to changing interference conditions, reducing the need for separate dedicated components and lowering overall implementation cost
3Measurement precision
If frequency offset exists in reference signal, then interference tracking accuracy decreases, but signal processing becomes simpler
Solution Approach 1:
The patent implements feedback mechanisms where the processed signal is fed back to adjust and refine the reference signal parameters. This feedback loop continuously corrects frequency offsets and improves tracking accuracy without requiring overly complex preprocessing circuits
Solution Approach 2:
The reference signal parameters are made dynamic and adaptive rather than fixed. The system can adjust frequency, phase, and amplitude parameters in real-time based on the actual interference characteristics, maintaining high tracking accuracy while using relatively simple processing circuits
Data Source
AI summary
A signal processing apparatus includes a signal generating block arranged to generate a target estimated signal of a specific signal component in an input signal. The signal generating block includes a reference signal generating circuit, a signal processing circuit, and a signal adjusting circuit. The reference signal generating circuit is arranged to generate a reference estimated signal for the specific signal component in the input signal. The signal processing circuit is coupled to the reference signal generating circuit, and arranged to process the reference estimated signal and accordingly generate a signal processing result. The signal adjusting circuit is coupled to the signal processing circuit and the reference signal generating circuit, and arranged to output the target estimated signal by adjusting the reference estimated signal according to the signal processing result.