Research Development of High Precision Real-time Airborne InSAR System

Chen, Lifu; Xiao, Hongguang; Wang, Hailiang; Lin, Yueguan

doi:10.4304/jcp.9.1.189-195

Cited by 4 publications

(3 citation statements)

References 13 publications

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“…Since the 1980s, dual-antenna airborne InSAR has been an effective method for three-dimensional modeling in local areas, generating DSM and DOM products [4]. The resolution of the experimental results has been improved from the early ten-meter level [5][6][7][8] to the submeter level [9], and the elevation accuracy can also reach the submeter level [10].…”

Section: Introductionmentioning

confidence: 99%

Experimental Results of Three-Dimensional Modeling and Mapping with Airborne Ka-Band Fixed-Baseline InSAR in Typical Topographies of China

et al. 2022

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Interferometric synthetic aperture radar (InSAR) has become a key technology for producing high-precision digital surface models (DSMs) and digital orthophoto maps (DOMs) in full time and all weathers. Airborne millimeter-wave InSAR, with large-scale and high-resolution imaging, is characterized by high spatial resolution, flexibility, and immunity to loss-of-correlation. This paper introduces our modeling experiments with airborne dual-antenna, Ka-band InSAR regarding typical topographies of China. Ka-band SAR data were acquired in designated experimental areas in flat (Heyang area in Shaanxi) and mountainous areas (Shibing area in Guizhou and Qionglai area in Sichuan). The key processing of the experimental data for DSMs and DOMs is demonstrated in the paper, especially the proposed robust and efficient phase unwrapping (PU) method for the interferometric data and block adjustment method of strip calibration. The results show that the proposed unwrapping method can provide reliable unwrapped phase results in undulating areas, and the block adjustment can carry out consistent calibration for strips with sparse ground control points (GCPs). The accuracy assessment of the DSM shows that the coordinate root mean square error (RSME) of the obtained DSM is less than 2 m in height, and 2.5 m horizontally, which meets the 1:5000 requirement for topographic mapping in difficult areas.

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Section: Introductionmentioning

confidence: 99%

Experimental Results of Three-Dimensional Modeling and Mapping with Airborne Ka-Band Fixed-Baseline InSAR in Typical Topographies of China

et al. 2022

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“…As important transportation hubs and military facilities, the detection of airports from Synthetic Aperture Radar (SAR) images attracts considerable interests for a long time [1]. SAR [2] provides all-weather and all-day observation and possesses the ability of cloud and fog penetration. However, SAR images are more difficult to interpret than optical images, since the analysis of SAR images is usually more complicated.…”

Section: Iintroductionmentioning

confidence: 99%

Geospatial Contextual Attention Mechanism for Automatic and Fast Airport Detection in SAR Imagery

et al. 2020

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The automatic extraction of airport runway areas from high-resolution Synthetic Aperture Radar (SAR) images is of great research significance in the military and civilian fields. However, it is still challenging to distinguish the airport from surrounding objects in SAR images. In this paper, a new framework is proposed to extract airport runway areas (runways, taxiways, packing lots, and aircrafts) in a fast and automatic manner. The framework is based on the Geospatial Contextual Attention Mechanism (GCAM) for geospatial feature learning and classification, which is employed together with the downsampling and coordinate mapping modules. To evaluate the performance of the proposed framework, three large-scale Gaofen-3 SAR images with 1m resolution are utilized in the experiment. According to the results, Mean Pixels Accuracy (MPA) and Mean Intersection Over Union (MIOU) of the GCAM are 0.9850 and 0.9536, respectively, which outperform RefineNet, DeepLabV3+, and MDDA. The training time of GCAM for the dataset is 2.25h, and the average testing time for the five SAR images is only 18.15s. Therefore, GCAM can offer rapid and automatic airport detection from high-resolution SAR images with high accuracy, which can further be employed to mark the airport to greatly improve the detection accuracy of the aircrafts.

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“…Fu et al, 2017) but without sufficient results to enable comparison with sUAV-SfM. Satellite-borne InSAR has ground resolutions as low as 1 m (Niemiec, 2009) with elevation errors of 15 to 50 cm (Di Bella et al, 2018;Dierking et al, 2017), while airborne InSAR may achieve 20 cm ground resolutions (FSAR) and up to 5 cm precision (Aes-1) (Chen et al, 2014). The topographical change detection threshold depends on the radar wavelength (Dierking et al, 2017), but millimetre-level precision is achievable (Berg et al, 2015).…”

mentioning

confidence: 99%

Sea-ice topographic surveying using Structure-from-Motion photogrammetry conducted from small UAVs

St-Amant¹

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The heterogenous topography of sea-ice is difficult to measure, monitor and predict.Recent technological improvements have enabled the development of structure from motion (SfM) surveying using small unmanned aerial vehicles (sUAVs). sUAV-SfM surveying was evaluated as a low-cost technique of obtaining sea-ice topography. Field data collection was conducted in Frobisher Bay and consisted of several sUAV-SfM surveys at the sub-kilometre-and kilometre-level spatial scale. RMSE values of 87 mm and 80 mm were obtained, respectively, for comparing the sUAV-SfM to a reference dataset and for comparing among individual sUAV-SfM surveys. The technique was successful at detecting, measuring and visualizing sea-ice features, such as pressure ridges. When compared to established techniques at similar spatial scales, sUAV-SfM was generally superior in terms of cost, simplicity, flexibility and ground resolution, but it suffered from low reliability due to accuracy issues with low-cost GPS receivers.iii

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Research Development of High Precision Real-time Airborne InSAR System

Cited by 4 publications

References 13 publications

Experimental Results of Three-Dimensional Modeling and Mapping with Airborne Ka-Band Fixed-Baseline InSAR in Typical Topographies of China

Experimental Results of Three-Dimensional Modeling and Mapping with Airborne Ka-Band Fixed-Baseline InSAR in Typical Topographies of China

Geospatial Contextual Attention Mechanism for Automatic and Fast Airport Detection in SAR Imagery

Sea-ice topographic surveying using Structure-from-Motion photogrammetry conducted from small UAVs

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