GNSS Receiver Interference Suppression Error Correction
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Solution Overview
Problem
Existing GNSS systems face significant position errors due to interference suppression systems, which introduce errors into navigation calculations, especially when accurate timing is required, as small timing errors can result in substantial position inaccuracies.
Innovation Solution
A receiver device and method that generate a calibration signal to correct for interference suppression errors by comparing suppressed calibrated pseudorange parameters to predetermined values, modifying satellite pseudorange parameters to improve accuracy during interference suppression.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If interference suppression systems are used to counteract jamming signals, then the ability to make GNSS calculations under interference conditions is improved, but timing error and position accuracy deteriorate
Solution Approach 1:
A calibration signal is introduced as an intermediary element to measure and characterize the error introduced by the interference suppression system. This calibration signal passes through the same suppression algorithm as the actual GNSS signals, allowing the system to determine a timing offset that represents the suppression error. This intermediary calibration approach enables quantification of the harmful effect without requiring changes to the interference suppression functionality itself.
Solution Approach 2:
The system implements feedback by using the calibration signal results to adjust and correct the timing measurements of actual GNSS signals. The measured timing offset from the calibration signal is fed back into the processing chain to compensate for the error in the suppressed GNSS calculations. This feedback loop continuously corrects the position accuracy degradation caused by interference suppression.
2Speed
If a timing error of 10 nanoseconds occurs in GNSS calculation, then the processing speed remains acceptable, but position error increases to 3 meters
Solution Approach 1:
The calibration signal is processed in advance to determine the timing offset before actual GNSS position calculations are performed. This preliminary measurement of the suppression error allows the system to prepare correction values that can be applied to subsequent GNSS signal processing, preventing the accumulation of timing errors that would otherwise lead to 3-meter position inaccuracies.
3Object-affected harmful factors
If interference suppression algorithm is applied to incoming signal, then jamming signal suppression is improved, but error is introduced into GNSS measurements
Solution Approach 1:
The calibration signal technique converts the harmful effect of interference suppression error into a measurable and correctable parameter. By deliberately passing a known calibration signal through the suppression algorithm, the system transforms the unwanted error into useful information about the suppression characteristics. This allows the error to be quantified and subsequently corrected, turning what was previously a harmful unintended consequence into a manageable and compensable factor.
Data Source
AI summary
A receiver device includes a radio frequency receiver and a processing circuit. The radio frequency receiver receives an incoming signal including a radio frequency satellite signal. The processing circuit is configured to generate a calibration signal, apply the calibration signal to the incoming signal to generate a calibrated incoming signal, execute an interference suppression algorithm on the calibrated incoming signal to generate a suppressed calibrated incoming signal, execute a tracking channel using the suppressed calibrated incoming signal to generate a suppressed calibrated pseudorange parameter, compare the suppressed calibrated pseudorange parameter to a predetermined calibrated pseudorange parameter to determine an interference suppression error, execute the interference suppression algorithm on the incoming signal to generate a suppressed incoming signal, execute a tracking channel using the suppressed incoming signal to generate a satellite pseudorange parameter, modify the satellite pseudorange parameter using the interference suppression error, and output a location of the receiver device.