Orbit modeling related to cartwheel geometry. - Ulrich Gebhardt; Otmar Loffeld; Holger Nies; Valerij Peters (IGARSS, 2003)

Sensitivity of DEMs generated from interferometric cartwheel configurations. - Stefan Knedlik; Otmar Loffeld; Holger Nies (IGARSS, 2003)

Orbit estimation of the interferometric cartwheel using an extended linearized Kalman filter. - Holger Nies; Otmar Loffeld; Ulrich Gebhardt; Valerij Peters (IGARSS, 2003)

Orbit tracking and interpolation using a realistic gravitation model. - Ulrich Gebhardt; Otmar Loffeld; Marc Kalkuhl; Holger Nies; Stefan Knedlik (IGARSS, 2004)

A data fusion approach for distributed orbit estimation. - Holger Nies; Otmar Loffeld; Stefan Knedlik; Ulrich Gebhardt; Wolfgang Wiechert (IGARSS, 2004)

Models and useful relations for bistatic SAR processing. - Otmar Loffeld; Holger Nies; Valerij Peters; Stefan Knedlik (IEEE Trans. Geosci. Remote. Sens., 2004)

First steps to bistatic focusing. - Koba Natroshvili; Otmar Loffeld; Holger Nies; Amaya Medrano Ortiz (IGARSS, 2005)

Parameter estimation for bistatic constellations. - Holger Nies; Otmar Loffeld; Koba Natroshvili; Ingo Walterscheid; Andreas R. Brenner (IGARSS, 2005)

Comparison of doppler centroid estimators in bistatic airborne SAR. - Amaya Medrano Ortiz; Otmar Loffeld; Stefan Knedlik; Holger Nies; Koba Natroshvili (IGARSS, 2005)

Bistatic Exploration using Spaceborne and Airborne SAR Sensors: A Close Collaboration Between FGAN, ZESS, and FOMAAS. - Joachim H. G. Ender; Jens Klare; Ingo Walterscheid; Andreas R. Brenner; Matthias Weiss; C. Kirchner; Helmut Wilden; Otmar Loffeld; Andreas Kolb 001; Wolfgang Wiechert; Marc Kalkuhl; Stefan Knedlik; et al. (IGARSS, 2006)

Bistatic Space Borne / Airborne Experiment: Geometrical Modeling and Simulation. - Ulrich Gebhardt; Otmar Loffeld; Holger Nies; Koba Natroshvili; Stefan Knedlik (IGARSS, 2006)

Modular SAR Simulator for Bi- and Multistatic Constellations. - Marc Kalkuhl; Peter Droste; Wolfgang Wiechert; Holger Nies; Otmar Loffeld (IGARSS, 2006)

2D Inverse Scaling Bistatic Processing and the focused Image Quality Measurements. - Koba Natroshvili; Otmar Loffeld; Holger Nies; Joachim H. G. Ender (IGARSS, 2006)

A Solution for Bistatic Motion Compensation. - Holger Nies; Otmar Loffeld; Koba Natroshvili; Amaya Medrano Ortiz (IGARSS, 2006)

Focusing of General Bistatic SAR Configuration Data With 2-D Inverse Scaled FFT. - Koba Natroshvili; Otmar Loffeld; Holger Nies; Amaya Medrano Ortiz; Stefan Knedlik (IEEE Trans. Geosci. Remote. Sens., 2006)

Parallel computation of synthetic SAR raw data. - Marc Kalkuhl; Peter Droste; Wolfgang Wiechert; Holger Nies; Otmar Loffeld; Martin Lambers (IGARSS, 2007)

GPu-based framework for interactive visualization of SAR data. - Martin Lambers; Andreas Kolb 001; Holger Nies; Marc Kalkuhl (IGARSS, 2007)

The bistatic aspect of the TanDEM-X mission. - Holger Nies; Otmar Loffeld; Koba Natroshvili; Marc Kalkuhl (IGARSS, 2007)

Second-order motion compensation in bistatic airborne SAR based on a geometrical approach. - Amaya Medrano Ortiz; Otmar Loffeld; Holger Nies; Stefan Knedlik (IGARSS, 2007)

Analysis and Focusing of Bistatic Airborne SAR Data. - Holger Nies; Otmar Loffeld; Koba Natroshvili (IEEE Trans. Geosci. Remote. Sens., 2007)

Image Registration of TerraSAR-X Data using Different Information Measures. - Holger Nies; Otmar Loffeld; Baki Dönmez; Amina Ben Hammadi; Robert Wang 001 (IGARSS (4), 2008)

Phase Unwrapping using 2D-Kalman Filter - Potential and Limitations. - Holger Nies; Otmar Loffeld; Robert Wang 001 (IGARSS (4), 2008)

Second-Order Motion Compensation in Bistatic Airborne SAR based on the Windowed Fourier-Transformation. - Amaya Medrano Ortiz; Otmar Loffeld; Holger Nies; Robert Wang 001 (IGARSS (3), 2008)

Optimizing the Individual Azimuth Contribution of Transmitter and Receiver Phase terms in Loffeld's Bistatic Formula (LBF) for Bistatic SAR Processing. - Qurat Ul-Ann; Otmar Loffeld; Holger Nies; Robert Wang 001; Stefan Knedlik (IGARSS (3), 2008)

Analysis and Processing of Spaceborne/Airborne Bistatic SAR Data. - Robert Wang 001; Otmar Loffeld; Holger Nies; Qurat Ul-Ann; Amaya Medrano Ortiz; Stefan Knedlik; Ashraf Samarah (IGARSS (3), 2008)

Interactive Dynamic Range Reduction for SAR Images. - Martin Lambers; Holger Nies; Andreas Kolb 001 (IEEE Geosci. Remote. Sens. Lett., 2008)

A Bistatic Point Target Reference Spectrum for General Bistatic SAR Processing. - Robert Wang 001; Otmar Loffeld; Qurat Ul-Ann; Holger Nies; Amaya Medrano Ortiz; Ashraf Samarah (IEEE Geosci. Remote. Sens. Lett., 2008)

Phase Unwrapping for SAR Interferometry - A Data Fusion Approach by Kalman Filtering. - Otmar Loffeld; Holger Nies; Stefan Knedlik; Yu Wang 031 (IEEE Trans. Geosci. Remote. Sens., 2008)

Focusing Spaceborne/Airborne Hybrid Bistatic SAR Data Using Wavenumber-Domain Algorithm. - Robert Wang 001; Otmar Loffeld; Holger Nies; Joachim H. G. Ender (IEEE Trans. Geosci. Remote. Sens., 2009)

Chirp-Scaling Algorithm for Bistatic SAR Data in the Constant-Offset Configuration. - Robert Wang 001; Otmar Loffeld; Holger Nies; Stefan Knedlik; Joachim H. G. Ender (IEEE Trans. Geosci. Remote. Sens., 2009)

Polarimetric and interferometric applications in a bistatic hybrid SAR mode using Terrasar-X. - Holger Nies; Florian Behner; Simon Reuter; Otmar Loffeld; Robert Wang 001 (IGARSS, 2010)

Development and experiments of a passive SAR receiver system in a bistatic spaceborne/stationary configuration. - Simon Reuter; Florian Behner; Holger Nies; Otmar Loffeld; Dietmar Matthes; Joachim Schiller (IGARSS, 2010)

Image formation algorithm for bistatic forward-looking SAR. - Robert Wang 001; Otmar Loffeld; Holger Nies; Valerij Peters (IGARSS, 2010)

Analysis and compensation for motion errors in FMCW SAR data. - Robert Wang 001; Otmar Loffeld; Holger Nies; Valerij Peters; Manfred Hagelen; Helmut Essen (IGARSS, 2010)

Bistatic SAR Experiments With PAMIR and TerraSAR-X - Setup, Processing, and Image Results. - Ingo Walterscheid; Thomas Espeter; Andreas R. Brenner; Jens Klare; Joachim H. G. Ender; Holger Nies; Robert Wang 001; Otmar Loffeld (IEEE Trans. Geosci. Remote. Sens., 2010)

Focus FMCW SAR Data Using the Wavenumber Domain Algorithm. - Robert Wang 001; Otmar Loffeld; Holger Nies; Stefan Knedlik; Manfred Hagelen; Helmut Essen (IEEE Trans. Geosci. Remote. Sens., 2010)

Focusing Bistatic SAR Data in Airborne/Stationary Configuration. - Robert Wang 001; Otmar Loffeld; Yew Lam Neo; Holger Nies; Ingo Walterscheid; Thomas Espeter; Jens Klare; Joachim H. G. Ender (IEEE Trans. Geosci. Remote. Sens., 2010)

Processing the Azimuth-Variant Bistatic SAR Data by Using Monostatic Imaging Algorithms Based on Two-Dimensional Principle of Stationary Phase. - Robert Wang 001; Yunkai Deng; Otmar Loffeld; Holger Nies; Ingo Walterscheid; Thomas Espeter; Jens Klare; Joachim H. G. Ender (IEEE Trans. Geosci. Remote. Sens., 2011)

An imaging algorithm based on keystone transform for one-stationary bistatic SAR of spotlight mode. - Xiaolan Qiu; Florian Behner; Simon Reuter; Holger Nies; Otmar Loffeld; Lijia Huang; Donghui Hu; Chibiao Ding (EURASIP J. Adv. Signal Process., 2012)

Development of a deeply-coupled GPS/INS integration algorithm using quaternions. - Yuhong Yang 005; Junchuan Zhou; Holger Nies; Otmar Loffeld; Stefan Knedlik (FUSION, 2013)

Synchronization and Processing in the HITCHHIKER Bistatic SAR Experiment. - Florian Behner; Simon Reuter; Holger Nies; Otmar Loffeld (IEEE J. Sel. Top. Appl. Earth Obs. Remote. Sens., 2016)

Analysis of Quadratic Phase Error Introduced by Orbit Determination in Spaceborne Trinodal Pendulum Sar Formation Real-Time Imaging with Monte Carlo Simulation. - Xiaoyu Yan; Jie Chen 009; Holger Nies; Hongcheng Zeng 001; Otmar Loffeld (IGARSS, 2019)

Analytical Approximation Model for Quadratic Phase Error Introduced by Orbit Determination Errors in Real-Time Spaceborne SAR Imaging. - Xiaoyu Yan; Jie Chen 009; Holger Nies; Otmar Loffeld (Remote. Sens., 2019)

Compact Ground-Based Interferometric Synthetic Aperture Radar: Short-range structural monitoring. - Andrei Anghel; Mihai-Liviu Tudose; Remus Cacoveanu; Mihai Datcu; Giovanni Nico; Olimpia Masci; Dongyang Ao; Weiming Tian; Cheng Hu 001; Zegang Ding; Holger Nies; Otmar Loffeld; et al. (IEEE Signal Process. Mag., 2019)

A Bistatic Analytical Approximation Model for Doppler Rate Estimation Error from Real-Time Spaceborne SAR Onboard Orbit Determination Data. - Xiaoyu Yan; Jie Chen 009; Holger Nies; Otmar Loffeld (Remote. Sens., 2020)

Complex-Valued Vs. Real-Valued Convolutional Neural Network for Polsar Data Classification. - Reza Mohammadi Asiyabi; Mihai Datcu; Holger Nies; Andrei Anghel (IGARSS, 2022)

Characterization of the PAZ X-Band SAR Using the HITCHHIKER Ground Receiver. - Florian Behner; Simon Reuter; Holger Nies; Juan Manuel Cuerda Muñoz; Marcos García Rodríguez; Otmar Loffeld (IEEE Geosci. Remote. Sens. Lett., 2022)

Complex-Valued End-to-End Deep Network With Coherency Preservation for Complex-Valued SAR Data Reconstruction and Classification. - Reza Mohammadi Asiyabi; Mihai Datcu; Andrei Anghel; Holger Nies (IEEE Trans. Geosci. Remote. Sens., 2023)

S1SLC_CVDL: A Complex-Valued Annotated Single Look Complex Sentinel-1 SAR dataset for Complex-Valued Deep Networks. - Reza Mohammadi Asiyabi; Mihai Datcu; Andrei Anghel; Holger Nies (IEEE DataPort, 2023)

Performance Analysis of Optical Flow Techniques for Airborne SAR Image Registration. - Prithvi Laguduvan Thyagarajan; Holger Nies; Patrick Berens; Ivo Ihrke (IEEE Trans. Geosci. Remote. Sens., 2024)

Ground-Based Passive Radar Imaging Using Geostationary Satellites - Perspectives and Constraints. - Holger Nies; Florian Behner; Simon Reuter; Timur Mulic; Ivo Ihrke (IEEE Geosci. Remote. Sens. Lett., 2025)