研究目的
To propose a postprocessing method for correcting geometric distortion in spaceborne GNSS-R delay-Doppler maps caused by rapid changes in delay differences between direct and reflected signals, avoiding the need for resource-intensive real-time compensation.
研究成果
The proposed postprocessing method effectively corrects DDM distortion using reconstruction algorithms, with MART showing better noise and distortion tolerance than CLS and TSVD. Optimal parameters (adjustable parameter of 0.5 or 0.6 and iteration number of 20) yield minimal RMSE. Future work will include developing a more comprehensive model that considers Doppler frequency variations.
研究不足
The degradation model only considers delay variation, assuming Doppler frequency difference is zero; it does not account for varying Doppler frequency, which may limit accuracy. The method's performance degrades with low SNR and longer compensation refresh periods, requiring parameter tuning for optimal results.
1：Experimental Design and Method Selection:
The study involves developing a degradation model for DDM distortion due to varying delay differences and applying reconstruction algorithms (MART, CLS, TSVD) to correct it.
2：Sample Selection and Data Sources:
Raw sampled data from UK TechDemoSat-1 satellite, specifically Level 0 data RD 16 collected on January 27, 2015, are used.
3：List of Experimental Equipment and Materials:
A software receiver with code parallel correlation in frequency domain is developed for processing data; no specific hardware is detailed.
4：Experimental Procedures and Operational Workflow:
Process UK TDS-1 data to generate DDMs with different compensation refresh periods, apply reconstruction methods, and compare results against a reference DDM with 1-ms compensation.
5：Data Analysis Methods:
Error maps and root-mean-square error (RMSE) are computed to evaluate reconstruction performance; dependence on SNR, compensation refresh period, and algorithm parameters is analyzed.
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