Trust-Region Baseline Design for Spaceborne Dual-Baseline InSAR
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Solution Overview
Problem
The design of satellite-borne dual-base interference SAR systems in China is insufficient, lacking experience in determining system parameters to meet high-accuracy terrain surveying and mapping needs, particularly in terms of baseline parameters affecting elevation measurement accuracy.
Innovation Solution
A design method using a trust region optimization algorithm to determine baseline parameters by considering elevation error sources unrelated to the baseline as maximum values, parameterizing baseline-related errors, and optimizing baseline length and dip angle to meet elevation accuracy indices through a trust region optimization algorithm.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the vertical baseline is increased to improve ambiguity height and elevation measurement accuracy, then the ambiguity height decreases and measurement accuracy improves, but baseline decoherence becomes more serious
Solution Approach 1:
The patent transforms the baseline design from a static fixed parameter to a dynamic adjustable parameter. The baseline length and dip angle are optimized based on specific measurement requirements, allowing the system to adapt between coherence preservation and measurement accuracy improvement by changing baseline parameters according to different operational scenarios
Solution Approach 2:
The patent introduces dynamic adjustment capability for baseline parameters (length and dip angle) to resolve the contradiction. By making the baseline configuration adjustable rather than fixed, the system can dynamically optimize the trade-off between coherence and measurement accuracy based on real-time operational needs
2Reliability
If the vertical baseline is decreased to improve baseline coherence, then coherence is maintained, but ambiguity height increases and measurement accuracy deteriorates
Solution Approach 1:
The patent uses parameter optimization to find the optimal baseline configuration that balances coherence and measurement accuracy. By calculating and selecting specific baseline length and dip angle values, the system achieves the best possible measurement accuracy while maintaining acceptable coherence levels
3Measurement precision
If the baseline parameters are optimized for elevation measurement tasks, then elevation measurement accuracy is improved, but the system's adaptability to other measurement tasks may be reduced
Solution Approach 1:
The patent designs the baseline parameter optimization framework to serve multiple measurement tasks. The same optimization methodology can be applied to different interferometric measurement scenarios, making the system versatile while maintaining high accuracy for elevation measurements through proper parameter selection
Data Source
AI summary
A design method of a trust region satellite-borne dual-base interference SAR system is provided, relating to the field of radar measurement. Firstly, error sources of the interference SAR system are classified and analyzed, phase errors caused by image decoherence are calculated according to wave positions, and an analytical expression of baseline-related errors is reserved; a maximum phase error caused by imaging processing and an electronic device are estimated; and a baseline error is estimated. Then, the phase errors and the baseline errors are converted into elevation errors through an elevation fuzzy number, thereby obtaining an analytical expression of the elevation errors and the baseline parameters (length and dip angle). With a relative height measurement accuracy index of the system as an optimization object, a feasible solution interval between the baseline length and the baseline dip angle of the system is solved through a trust region algorithm. A minimum value of the baseline length is corrected according to a flying-around safety distance of a dual-satellite formation. According to the method of the present disclosure, the design of the satellite-borne dual-base interference SAR system can be guided, so that the satellite-borne dual-base interference SAR system is ensured to carry out terrain elevation surveying and mapping tasks with high accuracy and high reliability.