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Guided Open-Loop System for Deep Space Doppler Tracking
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DOI：10.1109/TCSII.2024.3365720.png)
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Abstract
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High accuracy and real-time Doppler frequency estimation in deep space is essential for spacecraft ranging, orbit determination and planetary atmospheric measurement. Considering the problems of frequent lose-lock, high processing cost and performance degradation of current systems, an open-loop tracking system guided by the on-line self-calibrating trajectory model is proposed to achieve deep space high accuracy real-time Doppler frequency estimation. It includes a tracking guidance model to predict the target Doppler frequency changing for signal dynamic compensation and reduce the residual frequency estimation complexity, and a multi-stages residual estimation module to improve the frequency tracking accuracy. The proposed scheme is validated by both simulation test and actual space experiment data. The real-time frequency tracking error in simulation is 75.9mHz while the tracking residuals of MEX data is 3.7 similar to 7.1mHz. It shows competitive performance to post processing schemes with mHz class accuracy.
Keywords:
Deep-space communications
Deep space Doppler tracking
guided open-loop system
on-line self-calibration
multi-stages residual estimation
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