Real-Time Imaging Flow for High-Resolution Ice-Sounding Radar

In order to determine a great capacity of ice thickness assessments in a short time on-site, we have designed a real-time processor by using the modern commercial DSP chip named TMS320C6678. It is essential to develop an appropriate real-time imaging algorithm adapted to this real-time processor. In this paper, we propose a novel real-time imaging algorithm named the range-Doppler algorithm (RDA) integrated with the shift-and-correlate (SAC) algorithm. The proposed method extends the standard RDA to be appropriate for numerous media while adding the SAC algorithm to realize azimuth FM rate estimation to obtain accurate echograms of interior reflecting horizons (IRHs) and bedrock of the ice sheets at different depths. Initially, theoretical study is performed to the introduced method. Next, the hardware architecture of the designed real-time embedded system is presented, as well as the implementation of the proposed method on this processor. As a final point, the method is applied to the replication point targets and high-resolution ice-sounding radar information in order to verify its correctness of ice layers picturing. Through the presented echograms of ice sheets and the comparisons with both preceding methods in both main features, we can establish that the designed real-time processor accompany with the proposed RDA integrated with the SAC algorithm is quite reliable to generate the high-resolution ice-sounding images deprived of lowering the capability to reduce the azimuth clutter.

[1]  Guangyou Fang,et al.  High-Resolution Ice-Sounding Radar Measurements of Ice Thickness Over East Antarctic Ice Sheet as a Part of Chinese National Antarctic Research Expedition , 2018, IEEE Transactions on Geoscience and Remote Sensing.

[2]  S. Phillips,et al.  Synthetic Aperture Radar (SAR) Processing Application , 1992, OCEANS 92 Proceedings@m_Mastering the Oceans Through Technology.

[3]  Søren Nørvang Madsen,et al.  A Real-Time Processor For The Danish C-Band SAR , 1991, [Proceedings] IGARSS'91 Remote Sensing: Global Monitoring for Earth Management.

[4]  Richard D. Hale,et al.  High-Altitude Radar Measurements of Ice Thickness Over the Antarctic and Greenland Ice Sheets as a Part of Operation IceBridge , 2013, IEEE Transactions on Geoscience and Remote Sensing.

[5]  Richard Bamler,et al.  A comparison of range-Doppler and wavenumber domain SAR focusing algorithms , 1992, IEEE Trans. Geosci. Remote. Sens..

[6]  Chung-Chi Lin,et al.  Radio Echo Sounding of Pine Island Glacier, West Antarctica: Aperture Synthesis Processing and Analysis of Feasibility From Space , 2007, IEEE Transactions on Geoscience and Remote Sensing.

[7]  M. E. Peters,et al.  Along-Track Focusing of Airborne Radar Sounding Data From West Antarctica for Improving Basal Reflection Analysis and Layer Detection , 2007, IEEE Transactions on Geoscience and Remote Sensing.

[8]  Jargen Dall A NEW FREQUENCY DOMAIN AUTOFOCUS A LGORITHM FOR SAR , 1991 .

[9]  Bo Zhao,et al.  Modified Planar Subarray Processing Algorithm Based on ISFT for Real-Time Imaging of Ice-Sounding Data , 2017, IEEE Transactions on Geoscience and Remote Sensing.

[10]  Bo Zhao,et al.  Focused Synthetic Aperture Radar Processing of Ice-Sounding Data Collected Over the East Antarctic Ice Sheet via the Modified Range Migration Algorithm Using Curvelets , 2015, IEEE Transactions on Geoscience and Remote Sensing.

[11]  Manfred F. Buchroithner,et al.  Simplified Real‐Time Imaging Flow for High‐Resolution FMCW SAR , 2015, IEEE Geoscience and Remote Sensing Letters.

[12]  Bo Zhao,et al.  Two-Dimensional Imaging of Ice Sheets of Airborne Radar Sounder via a Combined Modified Range Migration Algorithm Based on ISFT and Beamforming Using Curvelets , 2015, IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing.

[13]  Jilu Li,et al.  Mapping of Ice Sheet Deep Layers and Fast Outlet Glaciers with Multi-Channel-High-Sensitivity Radar , 2009 .

[14]  Qiang Wu,et al.  Real-time SAR processing of ice-sounding data integrated with mitigation of RFI signals , 2016, 2016 IEEE International Geoscience and Remote Sensing Symposium (IGARSS).

[15]  Xiaoqing Wu,et al.  Ice Sheet Bed Mapping With Airborne SAR Tomography , 2011, IEEE Transactions on Geoscience and Remote Sensing.

[16]  Valery Sklyarov,et al.  Comparison of On-chip Communications in Zynq-7000 All Programmable Systems-on-Chip , 2015, IEEE Embedded Systems Letters.

[17]  R. Alley,et al.  Deformation of till beneath ice stream B, West Antarctica , 1986, Nature.

[18]  Torry L. Akins,et al.  Focused synthetic aperture radar processing of ice-sounder data collected over the Greenland ice sheet , 2001, IEEE Trans. Geosci. Remote. Sens..

[19]  Irena Hajnsek,et al.  Estimation of Glacier Ice Extinction Using Long-Wavelength Airborne Pol-InSAR , 2013, IEEE Transactions on Geoscience and Remote Sensing.