研究目的
To provide an overview of the updated hardware of an experimental car-borne SAR system and present SAR imagery obtained with it, focusing on improving cross-range resolution independent of observation distance.
研究成果
The car-borne SAR system demonstrates high-resolution imaging with cross-range resolution independent of distance, achieving about 10cm in azimuth and 1.8m in range. Future developments will focus on repeat-pass InSAR capabilities with an L-band radar and improvements in measurement and positioning setups.
研究不足
The system currently operates at Ku-band, which has a short wavelength requiring autofocus techniques to handle residual motion errors; future work aims to use L-band for better performance. The resolution is dependent on bandwidth and antenna characteristics, and the setup may have constraints in trajectory accuracy.
1：Experimental Design and Method Selection:
The experiment involves using a car-borne SAR system at Ku-band with FMCW radar, employing time-domain back-projection (TDBP) focusing adapted for FMCW systems and a GPU-based parallelized implementation using NVIDIA's CUDA.
2：Sample Selection and Data Sources:
Data was acquired from a car driving along a road over a 285m section, with corner reflectors deployed in the field for impulse response analysis.
3：List of Experimental Equipment and Materials:
Includes a modified GPRI-II Ku-band FMCW radar, iMAR iNAV-RQH INS/GNSS system, horn antennas, RFA unit, computer, power supplies, and Software Defined Radio (SDR).
4：Experimental Procedures and Operational Workflow:
The radar system was mounted on a car, driven along a trajectory; data was collected and processed using TDBP on a GPU, with geocoding and blending with orthophotos.
5：Data Analysis Methods:
Analysis involved evaluating impulse response functions for resolution metrics and using autofocus techniques to mitigate motion errors.
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