Collection and processing data for high quality CCD images.

Abstract

Coherent Change Detection (CCD) with Synthetic Aperture Radar (SAR) images is a technique whereby very subtle temporal changes can be discerned in a target scene. However, optimal performance requires carefully matching data collection geometries and adjusting the processing to compensate for imprecision in the collection geometries. Tolerances in the precision of the data collection are discussed, and anecdotal advice is presented for optimum CCD performance. Processing considerations are also discussed.-4 - ACKNOWLEDGEMENTS

Joint Exploitation of Coherent Change Detection and Global-Context Capturing Network for Subtle Changed Track Detection With Airborne SAR

“…Unlike ICCD methods, CCD methods use both intensity and phase fractions to generate the differences [7,8]. However, this requires strict repeat-pass repeat-geometry imaging.…”

“…I presents the working parameters of our airborne CCD system. The system operates at a carrier frequency of 35 GHz (Ka band) with a wavelength of 8.6 mm, which maximizes the phase sensitivity of the CCD methodology [8]. The system is capable of achieving an azimuth and range resolution of 0.3 m, which remains relatively constant across different imaging geometries and scenes.…”

“…We also arranged some vehicle tracks and footprint tracks in this region during each pass interval. For region (c) of Zhangjiakou city with a snow surface, we arranged the flight route from east to west and only arranged the vehicle tracks in Table II Notably, the temporal interval between these image pairs was a few hours, which ensured entire coherence between the image pairs while highlighting the decorrelation caused by track deformation due to human activities [8,15]. Our proposed network-based detection method belonged to supervised learning, which required training data to optimize the detection model and testing data to validate the detection performance.…”

“…resolution to the baseline resolution using the frequency domain interpolation method. With this processing, the azimuth resolution difference can be suppressed, and the entire coherence between paired images is also improved [8]. Notably, the topographical phase caused by radar position changes needs to be removed with a DEM or accurate topography for spaceborne CCD systems.…”

Laboratory bistatic synthetic aperture radar coherent change detection investigation

“…The RCS term introduced in [8] accounts for a difference in backscattering dependent on imaging geometry, and could incorporate many effects including variation in shadowing, multipath, and polarization. The temporal and baseline correlation terms are typically of most interest for imaged scenes with developed speckle and low baseline [6,9], however at least for bistatic geometries with high baseline, the RCS term is hypothesized to play a significant role.…”