Satellite Navigation Receiver Bias Estimation
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Solution Overview
Problem
Existing satellite navigation receivers face challenges in achieving accurate relative positioning due to initial position bias, receiver clock bias, and atmospheric propagation delay, especially over long time intervals where error growth degrades accuracy.
Innovation Solution
A satellite navigation receiver is designed with a receiver module to track carrier signals from satellites, a measurement module to determine correlations, and a relative position estimator that models and compensates for biases such as initial position bias, receiver clock bias, and atmospheric propagation delay, allowing for accurate relative positioning independent of precise position solution convergence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If carrier-phase-based time differencing is used for position estimation, then measurement precision is improved, but reliability deteriorates over long time periods due to error growth
Solution Approach 1:
The patent applies preliminary action by estimating and compensating for biases (initial position bias, receiver clock bias, atmospheric propagation delay bias) before they significantly degrade positioning accuracy. The relative position estimator proactively models these biases using measurement data from multiple satellites, preventing error accumulation that would otherwise occur over long time intervals. This allows the system to maintain both high precision and reliability extended beyond the traditional limited time periods.
2Device complexity
If relative positioning is used without known initial position or bias compensation, then device complexity is reduced, but measurement precision deteriorates due to initial position bias
Solution Approach 1:
The patent implements self-service by enabling the relative position estimator to automatically model and compensate for its own biases using measurement data from multiple satellites. The system derives initial position bias, receiver clock bias, and atmospheric propagation delay bias estimates from the satellite measurements themselves, without requiring external correction data or complex absolute positioning solutions. This self-correcting mechanism maintains high precision while keeping the system relatively simple and independent.
Data Source
AI summary
A tracking module processes the determined correlations to track a carrier of the received composite signal for estimation of a change in phase over a time period between a receiver antenna and one or more satellite transmitters that transmit the received signal as the receiver changes position with respect to an initial position during the time period. A relative position estimator estimates the relative position of the navigation receiver with respect to an initial position over the time period time by time-differencing of the phase measurements of the one or more tracked carrier signals. Bias estimators can estimate or compensate for errors in initial position and temporal changes in receiver clock and tropospheric delay.